Bamboo charcoal fertilizer prepared from bamboo activated carbon and preparation method of bamboo charcoal fertilizer

Abstract

The invention relates to the technical field of biomass organic fertilizers, in particular to a bamboo charcoal fertilizer prepared from bamboo activated carbon and a preparation method of the bamboo charcoal fertilizer. According to the bamboo charcoal fertilizer prepared from the bamboo activated carbon, the bamboo charcoal fertilizer prepared from the bamboo activated carbon is obtained by adsorbing urine through magnesium modified bamboo activated carbon, and the surface of the magnesium modified bamboo activated carbon is subjected to organic acid treatment. The bamboo activated carbon used in the bamboo charcoal fertilizer prepared from the bamboo activated carbon has an excellent adsorption effect on nitrogen and phosphorus.

Description

Technical Field

[0001] The present application relates to the technical field of biomass organic fertilizers, and more specifically, to a bamboo charcoal fertilizer made from bamboo activated carbon and a preparation method thereof. Background Art

[0002] The toilet revolution is related to people's livelihood. The treatment and utilization of toilet feces and sewage is closely related to the living environment. At present, the treatment of feces and sewage is usually carried out in the form of flushing, which requires a large number of sewage pipes and sewage treatment facilities. However, in the context of severe global water shortage, flushing requires a large amount of water resources, which in turn causes huge waste.

[0003] In addition, urine is rich in nutrients such as nitrogen, phosphorus, and organic matter, accounting for about 7%. Flushing will lead to direct loss of these nutrients, which will not only block their recycling path but may also cause water pollution. Therefore, separate treatment and utilization of urine is conducive to improving the resource level of urine and alleviating the pressure of wastewater treatment.

[0004] However, the current technology for recycling urine resources is costly and the product is single, which is not conducive to storage and transportation. The bamboo charcoal adsorption method is simple and easy to operate, which can break the liquid limitation and achieve the coordinated treatment of nutrients and water quality. However, the adsorption effect of bamboo charcoal on nitrogen and phosphorus is limited. Therefore, there is an urgent need for a bamboo activated carbon with better nitrogen and phosphorus adsorption effect to be applied to bamboo charcoal fertilizer. Summary of the invention

[0005] In order to improve the defect of insufficient nitrogen and phosphorus adsorption performance of conventional bamboo activated carbon, the present application provides a bamboo charcoal fertilizer made from bamboo activated carbon and a preparation method thereof.

[0006] In the first aspect, the present application provides a bamboo charcoal fertilizer made from bamboo activated carbon, using the following technical solution: The invention discloses a bamboo charcoal fertilizer made from bamboo activated carbon. The bamboo charcoal fertilizer is obtained by adsorbing urine on magnesium-modified bamboo activated carbon, and the surface of the magnesium-modified bamboo activated carbon is treated with organic acid.

[0007] When the surface of bamboo activated carbon is modified with magnesium, the surface of bamboo activated carbon will be loaded with magnesium ions or magnesium oxides, thereby increasing the adsorption of phosphate by bamboo activated carbon. The adsorption enhancement mechanism may be that after magnesium modification, the surface of bamboo activated carbon will be loaded with positively charged magnesium ions, thereby increasing the electrostatic attraction effect between bamboo activated carbon and phosphate; or, phosphate forms a complex with magnesium ions on the surface of bamboo activated carbon, thereby achieving the adsorption of phosphate.

[0008] In addition, since ammonia is an alkaline gas, it can combine with acidic sites. Therefore, constructing acidic sites on the surface of bamboo activated carbon can further enhance the adsorption effect of bamboo activated carbon on ammonia. As the number and strength of acidic sites increase, the adsorption effect becomes stronger.

[0009] There are two main ways for ammonia to combine with acidic sites. One is that the metal cation of the metal oxide accepts the lone pair of electrons of the nitrogen atom and acts as a Lewis acid site on the surface. The other is that ammonia is protonated by the surface oxygen-containing functional groups or water protons, and then adsorbed on the surface through acid-base interactions with Brønsted acid sites. Therefore, constructing oxygen-containing functional groups on the surface of bamboo activated carbon can further enhance the adsorption effect of bamboo activated carbon on ammonia, and organic acid treatment can promote the formation of a large number of carboxyl functional groups on the surface of bamboo activated carbon, and the carboxyl functional groups can react chemically with ammonia, thereby achieving the effect of adsorbing ammonia.

[0010] Preferably, the preparation method of magnesium-modified bamboo activated carbon comprises the following steps: drying the bamboo activated carbon at 100-110°C for 10-14h, then soaking the dried bamboo activated carbon in a magnesium chloride aqueous solution for 10-14h, then taking it out and drying it at 100-110°C for 10-14h, then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon.

[0011] Preferably, the preparation method of the magnesium-modified bamboo activated carbon is: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, the mass fraction of the magnesium chloride aqueous solution is between 5%-15%, and then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon.

[0012] Preferably, the magnesium-modified bamboo activated carbon is attached with a natural antibacterial and insect repellent extract, and the natural antibacterial and insect repellent extract includes a clove extract and a litsea cubeba extract, and the mass ratio of the clove extract to the litsea cubeba extract is (1-3): (3-5).

[0013] In the preparation process of bamboo charcoal fertilizer made from bamboo activated carbon, the bamboo activated carbon is mainly placed in a waterless toilet, so that while the excrement is being processed, nutrients can also be collected. However, if the excrement is accumulated for a long time without being processed, a large number of pathogens will be formed in the area, and a large number of flies and insects will be attracted, which will lead to a significant deterioration of the bathroom environment.

[0014] When natural antibacterial and insect repellent extracts are attached to the surface of bamboo activated carbon, since the natural antibacterial and insect repellent extracts include clove extract and litsea cubeba extract, the bamboo activated carbon can repel flies and insects and perform antibacterial treatment.

[0015] Specifically, clove extract contains eugenol, acetyl eugenol, caryophyllene, methyl salicylate and methyl n-amyl ketone, among which eugenol and acetyl eugenol have strong antibacterial effects. The antibacterial mechanism of eugenol and acetyl eugenol is that eugenol and acetyl eugenol can destroy the cell membrane of bacteria, thereby leaking nucleic acids and proteins in bacterial cells, thereby achieving antibacterial effects.

[0016] In addition, eugenol in clove extract can also produce a pungent smell, which is extremely uncomfortable for mosquitoes. Moreover, eugenol can directly act on the nervous and respiratory systems of mosquitoes, destroying their vital activities and causing them to become paralyzed or die.

[0017] Litsea cubeba extract contains citral, citronellal, litsea cubeba oil, geraniol, linalool, methyl heptenone and other substances. Among them, citral, citronellal, geraniol and litsea cubeba oil all have strong antibacterial effects. The antibacterial properties of citral and citronellal are particularly prominent. The antibacterial mechanism is that citral and citronellal can directly denature bacterial proteins or enzymes, destroy bacterial tissue structures, inhibit biosynthesis, reduce the permeability of cell membranes or seal cell walls, and interfere with bacterial decomposition and metabolism.

[0018] In addition, the extract of Litsea cubeba contains phosgene, which can produce an extremely uncomfortable and irritating smell for mosquitoes, thereby achieving an insect repellent effect. In addition, the extract of Litsea cubeba also contains aurantium, which can damage the nervous system of mosquitoes, making it difficult for them to grow and reproduce normally. At the same time, basalt can also change the pH and ion balance in the mosquito's body, making it difficult for mosquitoes to survive.

[0019] Preferably, the natural antibacterial and insect repellent extract further comprises vinyl polydimethylsiloxane and KARSTEDT catalyst, and the added amount of vinyl polydimethylsiloxane is 10-20% of the total mass of the natural antibacterial and insect repellent extract, and the added amount of KARSTEDT catalyst is 1-3% of the total mass of the natural antibacterial and insect repellent extract.

[0020] When the silane coupling agent, clove extract and Litsea cubeba extract are mixed and stirred, the prepared extract-modified bamboo activated carbon will have a better antibacterial and insect repellent effect. The reason may be that the silanol bond obtained by hydrolysis of siloxane will react and connect with the eugenol in the clove extract. At the same time, the silanol bond will produce a condensation reaction with the hydroxyl group produced when the bamboo activated carbon is modified by magnesium. The citral in the Litsea cubeba extract can directly undergo a cross-linking reaction with the hydroxyl group produced when the bamboo activated carbon is modified by magnesium, thereby obtaining a bamboo activated carbon-eugenol-citral cross-linking network, effectively improving the compatibility between the components of the extract-modified bamboo activated carbon, and effectively improving the migration and precipitation resistance of the natural antibacterial and insect repellent extract.

[0021] Preferably, the preparation method of the natural antibacterial and anti-parasitic extract is as follows: first, the euphorbia litsea cubeba / clove is crushed and dried, then the clove powder is soaked in an acetone solvent and allowed to stand at a temperature of 20-30°C for 20-30h, then extracted three times with an acetone solution, and finally 1g / ml euphorbia litsea cubeba / clove extract is obtained; then the clove extract, euphorbia litsea cubeba extract, vinyl polydimethylsiloxane and KARSTEDT catalyst are mixed to obtain the natural antibacterial and anti-parasitic extract.

[0022] Preferably, the steps of the organic acid treatment are: first, the magnesium-modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried.

[0023] In a second aspect, the present application provides a method for preparing bamboo charcoal fertilizer from bamboo activated carbon, using the following technical solution: A method for preparing bamboo charcoal fertilizer from bamboo activated carbon comprises the following steps: Preparation of magnesium-modified bamboo activated carbon: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, wherein the mass fraction of the magnesium chloride aqueous solution is between 5% and 15%, then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon; Organic acid treatment: firstly, the magnesium-modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried to obtain the organic acid-modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

[0024] A method for preparing bamboo charcoal fertilizer from bamboo activated carbon comprises the following steps: Preparation of magnesium-modified bamboo activated carbon: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, wherein the mass fraction of the magnesium chloride aqueous solution is between 5% and 15%, then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon; Modification of natural antibacterial and insect repellent extract: Mixing magnesium-modified bamboo activated carbon with natural antibacterial and insect repellent extract, wherein the mass ratio of magnesium-modified bamboo activated carbon to natural antibacterial and insect repellent extract is (3-5):1, and then drying to obtain extract-modified bamboo activated carbon; Organic acid treatment: firstly, the extract modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried to obtain organic acid modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

[0025] In the present application, magnesium-modified bamboo activated carbon is firstly modified with extracts and then treated with organic acid, so that the prepared organic acid-modified bamboo activated carbon has a better antibacterial and insect repellent effect. The reason may be that if organic acid modification is performed first, the hydroxyl groups produced during the magnesium modification of the bamboo activated carbon will be directly consumed by the organic acid, thereby making it difficult to produce a bamboo activated carbon-eugenol-citral cross-linked network.

[0026] In summary, this application has the following beneficial effects: 1. After the surface of bamboo activated carbon is modified with magnesium, the surface of bamboo activated carbon will be loaded with magnesium ions or magnesium oxides, thereby increasing the adsorption of phosphate by bamboo activated carbon. The adsorption enhancement mechanism may be that after magnesium modification, the surface of bamboo activated carbon will be loaded with positively charged magnesium ions, thereby increasing the electrostatic attraction effect between bamboo activated carbon and phosphate; or, phosphate forms a complex with magnesium ions on the surface of bamboo activated carbon, thereby achieving the adsorption of phosphate.

[0027] 2. Ammonia, as an alkaline gas, can combine with acidic sites. Therefore, constructing acidic sites on the surface of bamboo activated carbon can further enhance the adsorption effect of bamboo activated carbon on ammonia. As the number and strength of acidic sites increase, the adsorption effect becomes stronger. Organic acid treatment can promote the formation of a large number of carboxyl functional groups on the surface of bamboo activated carbon, and the carboxyl functional groups can react chemically with ammonia, thereby achieving the effect of adsorbing ammonia.

[0028] 3. In the preparation process of bamboo charcoal fertilizer made from bamboo activated carbon, bamboo activated carbon is mainly placed in a waterless toilet, so that while processing the excrement, nutrients can also be collected. However, if the excrement is accumulated for a long time without being processed, a large number of pathogens will be formed in the area, and a large number of flies and insects will be attracted, which will lead to a significant deterioration of the bathroom environment. When natural antibacterial and insect repellent extracts are attached to the surface of bamboo activated carbon, since the natural antibacterial and insect repellent extracts include clove extract and Litsea cubeba extract, bamboo activated carbon can repel flies and insects and perform antibacterial treatment. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with Examples 1-8 and Comparative Examples 1-2.

[0030] raw material The preparation method of bamboo activated carbon comprises the following steps: Preparation of raw material powder: crush and grind the bamboo raw material, and sieve to obtain 80-mesh bamboo raw material powder; Deashing: The bamboo raw material powder was acid-washed with a 2 mol / L hydrochloric acid aqueous solution at 40°C for 60 min, then washed with deionized water and water at 40°C until neutral and dried to obtain deashed powder; Carbonization: The primary deashing powder is placed in an argon protective atmosphere, the temperature is raised to 500°C at a rate of 8°C / min, and then carbonized for 110 minutes, and finally cooled to room temperature to obtain carbonized powder; Activation: The carbonized powder was placed in a steam activation device with a steam flow rate of 10 ml / min and activated at 800°C for 3 h to obtain bamboo activated carbon.

[0031] Bamboo, clove and litsea cubeba are all commercially available; hydrochloric acid CAS: 7647-01-0; magnesium chloride CAS: 7786-30-3; vinyl polydimethylsiloxane CAS: 53529-60-5; KARSTEDT catalyst CAS: 81032-58-8; citric acid CAS: 77-92-9.

[0032] The invention discloses a bamboo charcoal fertilizer made from bamboo activated carbon. The bamboo charcoal fertilizer is obtained by adsorbing urine on magnesium-modified bamboo activated carbon, and the surface of the magnesium-modified bamboo activated carbon is treated with organic acid.

[0033] The preparation method of bamboo charcoal fertilizer made of bamboo activated carbon comprises the following steps: Preparation of magnesium-modified bamboo activated carbon: The bamboo activated carbon was dried at 105°C for 12 hours, and then 5 g of the dried bamboo activated carbon was soaked in 10 ml of magnesium chloride aqueous solution for 12 hours, the mass fraction of the magnesium chloride aqueous solution was 10%, and then taken out and dried at 105°C for 12 hours, and then the dried product was placed in a muffle furnace, heated to 450°C at a rate of 5°C / min and kept warm for 2.5 hours, and finally cooled naturally to obtain magnesium-modified bamboo activated carbon; Organic acid treatment: First, the magnesium-modified bamboo activated carbon was placed in an environment of 110°C for drying, and then immersed in a 15% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 30°C for 45h, and finally filtered and dried to obtain organic acid-modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

[0034] The difference from Example 1 is that in the magnesium modification, the mass fraction of the magnesium chloride aqueous solution is different, as shown in Table 1.

[0035] Table 1 Mass fraction of magnesium chloride aqueous solution in Examples 1-3 Example 1 Example 2 Example 3 Magnesium chloride aqueous solution 10% 5% 15% The difference from Example 1 is that the magnesium-modified bamboo activated carbon is firstly attached with the natural antibacterial and insect repellent extract, and then treated with organic acid.

[0036] The specific operation includes the following steps: Preparation of magnesium-modified bamboo activated carbon: The bamboo activated carbon was dried at 105°C for 12 hours, and then 5 g of the dried bamboo activated carbon was soaked in 10 ml of magnesium chloride aqueous solution for 12 hours, the mass fraction of the magnesium chloride aqueous solution was 10%, and then taken out and dried at 105°C for 12 hours, and then the dried product was placed in a muffle furnace, heated to 450°C at a rate of 5°C / min and kept warm for 2.5 hours, and finally cooled naturally to obtain magnesium-modified bamboo activated carbon; Modification of natural antibacterial and insect repellent extract: Mixing magnesium-modified bamboo activated carbon with natural antibacterial and insect repellent extract, with the mass ratio of magnesium-modified bamboo activated carbon to natural antibacterial and insect repellent extract being 4:1, and then drying to obtain extract-modified bamboo activated carbon; Organic acid treatment: firstly, the extract-modified bamboo activated carbon was placed in an environment of 110°C for drying, then immersed in a 15% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 30°C for 45h, and finally filtered and dried to obtain organic acid-modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

[0037] The natural antibacterial and insect repellent extract includes clove extract and litsea cubeba extract, and the mass ratio of clove extract to litsea cubeba extract is 1:2; the preparation method of the natural antibacterial and insect repellent extract is: first, litsea cubeba / clove are crushed and dried, then the clove powder is soaked in acetone solvent, and left to stand at 25°C for 24 hours, and then extracted three times with acetone solution to finally obtain 1g / ml litsea cubeba / clove extract; then the clove extract and litsea cubeba extract are mixed to obtain the natural antibacterial and insect repellent extract.

[0038] The difference from Example 4 is that the natural antibacterial and insect repellent extract also includes vinyl polydimethylsiloxane and KARSTEDT catalyst, and the added amount of vinyl polydimethylsiloxane is 15% of the total mass of the natural antibacterial and insect repellent extract, and the added amount of KARSTEDT catalyst is 2% of the total mass of the natural antibacterial and insect repellent extract.

[0039] The preparation method of the natural antibacterial and anti-insect extract is as follows: first, the euphorbia litsea cubeba / clove is crushed and dried, then the clove powder is soaked in an acetone solvent and allowed to stand at 25°C for 24 hours, then extracted three times with an acetone solution, and finally a 1g / ml euphorbia litsea cubeba / clove extract is obtained; then the clove extract, the euphorbia litsea cubeba extract, vinyl polydimethylsiloxane and the KARSTEDT catalyst are mixed to obtain the natural antibacterial and anti-insect extract.

[0040] The difference from Example 5 is that the mass ratios of the clove extract and the litsea cubeba extract are different, as shown in Table 2.

[0041] Table 2 The mass ratio of clove extract and litsea cubeba extract in Examples 5-7 Example 5 Example 6 Example 7 Clove Extract 1 1 1 Litsea cubeba extract 2 5 1 The difference from Example 5 is that the magnesium-modified bamboo activated carbon is first treated with an organic acid and then the natural antibacterial and insect repellent extract is attached.

[0042] The specific operation includes the following steps: Preparation of magnesium-modified bamboo activated carbon: The bamboo activated carbon was dried at 105°C for 12 hours, and then 5 g of the dried bamboo activated carbon was soaked in 10 ml of magnesium chloride aqueous solution for 12 hours, the mass fraction of the magnesium chloride aqueous solution was 10%, and then taken out and dried at 105°C for 12 hours, and then the dried product was placed in a muffle furnace, heated to 450°C at a rate of 5°C / min and kept warm for 2.5 hours, and finally cooled naturally to obtain magnesium-modified bamboo activated carbon; Organic acid treatment: First, the magnesium-modified bamboo activated carbon was placed in an environment of 110°C for drying, and then immersed in a 15% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 30°C for 45h, and finally filtered and dried to obtain organic acid-modified bamboo activated carbon; Modification of natural antibacterial and insect repellent extract: Mixing the organic acid-modified bamboo activated carbon with the natural antibacterial and insect repellent extract, with the mass ratio of magnesium-modified bamboo activated carbon to the natural antibacterial and insect repellent extract being 4:1, and then drying to obtain the extract-modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: The extract-modified bamboo activated carbon is placed in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

[0043] Comparative Example Comparative Example 1 The difference from Example 1 is that no magnesium modification treatment is performed.

[0044] Comparative Example 2 The difference from Example 1 is that no organic acid modification treatment is performed.

[0045] Performance testing Nitrogen and phosphorus adsorption performance test Three portions of organic acid-modified bamboo activated carbon were taken from Examples 1-3 and Comparative Examples 1-2, and then added to 1L of urine at a rate of 1g and stirred continuously. The initial nitrogen concentration of urine (NH4 + -N) 2459.39 mg / L, initial urine phosphorus concentration (PO4 3- -P) 441.93mg / L, stirring temperature 25℃, stirring time 10h, stirring speed 100r / min, and then measure the real-time nitrogen concentration and real-time phosphorus concentration of urine, and finally calculate the nitrogen adsorption value and phosphorus adsorption value and take the average value.

[0046] Nitrogen adsorption value = (initial nitrogen concentration - real-time nitrogen concentration) × 1L / 1g; Phosphorus adsorption value = (initial phosphorus concentration - real-time phosphorus concentration) × 1L / 1g.

[0047] The test data are shown in Table 3.

[0048] Insect repellent performance test Three portions of organic acid-modified bamboo activated carbon were taken from Example 1 and Examples 4-8, and then added in an amount of 10 g to a 1 dm 3 200 flies were placed in a box with holes. After 2 hours, the number of flies escaping from the box was recorded and the average value was taken.

[0049] The test data are shown in Table 4.

[0050] 3. Antibacterial performance test Three portions of organic acid-modified bamboo activated carbon were taken from Example 1 and Examples 4-8, and then added into 1L urine at a dosage of 1g and stirred continuously. The total number of initial colonies in urine was 10 6 CFU / L, stirring time 10h, stirring speed 100r / min, and then measure the total colony count in urine in real time, and finally calculate the antibacterial rate and take the average value.

[0051] Antibacterial rate = (initial total colony count - real-time total colony count) / initial total colony count.

[0052] The test data are shown in Table 4.

[0053] Table 3 Nitrogen and phosphorus adsorption value data table of Examples 1-3 and Comparative Examples 1-2 (mg / g) Nitrogen adsorption value (mg / g) Phosphorus adsorption value (mg / g) Example 1 1753.41 298.63 Example 2 1744.93 280.37 Example 3 1739.25 302.91 Comparative Example 1 1799.69 238.73 Comparative Example 2 1221.47 309.11 Table 4 Antibacterial and insect repellent data table of Example 1 and Examples 4-8 Number of mosquitoes escaping Antibacterial rate / % Example 1 12 21.6% Example 4 151 83.9% Example 5 176 95.3% Example 6 170 92.1% Example 7 167 91.5% Example 8 162 88.9% Referring to the embodiments and comparative examples 1-2 and in combination with Table 3, it can be seen that relative to embodiment 1, the phosphorus adsorption value of comparative example 1 is significantly reduced, and the nitrogen adsorption value of comparative example 2 is significantly reduced, which shows that magnesium modification treatment can effectively improve the phosphorus adsorption capacity of bamboo activated carbon, while organic acid modification can effectively improve the nitrogen adsorption capacity of bamboo activated carbon.

[0054] The reason may be that after the surface of bamboo activated carbon is modified with magnesium, the surface of bamboo activated carbon will be loaded with magnesium ions or magnesium oxides, thereby increasing the adsorption of phosphate by bamboo activated carbon. The adsorption enhancement mechanism may be that after magnesium modification, the surface of bamboo activated carbon will be loaded with positively charged magnesium ions, thereby increasing the electrostatic attraction effect between bamboo activated carbon and phosphate; or, phosphate forms a complex with magnesium ions on the surface of bamboo activated carbon, thereby achieving the adsorption of phosphate.

[0055] Ammonia, as an alkaline gas, can combine with acidic sites. Therefore, constructing acidic sites on the surface of bamboo activated carbon can further enhance the adsorption effect of bamboo activated carbon on ammonia. As the number and strength of acidic sites increase, the adsorption effect becomes stronger.

[0056] There are two main ways for ammonia to combine with acidic sites. One is that the metal cation of the metal oxide accepts the lone pair of electrons of the nitrogen atom and acts as a Lewis acid site on the surface. The other is that ammonia is protonated by the surface oxygen-containing functional groups or water protons, and then adsorbed on the surface through acid-base interactions with Brønsted acid sites. Therefore, constructing oxygen-containing functional groups on the surface of bamboo activated carbon can further enhance the adsorption effect of bamboo activated carbon on ammonia, and organic acid treatment can promote the formation of a large number of carboxyl functional groups on the surface of bamboo activated carbon, and the carboxyl functional groups can react chemically with ammonia, thereby achieving the effect of adsorbing ammonia.

[0057] With reference to Examples 1-3 and in combination with Table 3, it can be seen that, relative to Example 1, the nitrogen adsorption values ​​of Examples 2-3 are slightly decreased, the phosphorus adsorption value of Example 2 is significantly decreased, and the phosphorus adsorption value of Example 2 is slightly increased, but the increase is not large. Therefore, considering comprehensively, it is relatively better to select 10% of the mass fraction of the magnesium chloride aqueous solution.

[0058] With reference to Example 1 and Example 4 and in combination with Table 4, it can be seen that, relative to Example 1, the number of mosquitoes escaping and the antibacterial rate of Example 4 are significantly improved, which indicates that the attachment of the natural antibacterial and insect repellent extract can promote the bamboo activated carbon to have an extremely good antibacterial and insect repellent effect.

[0059] The reason is that clove extract contains eugenol, acetyl eugenol, caryophyllene, methyl salicylate and methyl n-amyl ketone, among which eugenol and acetyl eugenol have strong antibacterial effects. The antibacterial mechanism of eugenol and acetyl eugenol is that eugenol and acetyl eugenol can destroy the cell membrane of bacteria, thereby leaking nucleic acids and proteins in bacterial cells, thereby achieving antibacterial effects.

[0060] In addition, eugenol in clove extract can also produce a pungent smell, which is extremely uncomfortable for mosquitoes. Moreover, eugenol can directly act on the nervous and respiratory systems of mosquitoes, destroying their vital activities and causing them to become paralyzed or die.

[0061] Litsea cubeba extract contains citral, citronellal, litsea cubeba oil, geraniol, linalool, methyl heptenone and other substances. Among them, citral, citronellal, geraniol and litsea cubeba oil all have strong antibacterial effects. The antibacterial properties of citral and citronellal are particularly prominent. The antibacterial mechanism is that citral and citronellal can directly denature bacterial proteins or enzymes, destroy bacterial tissue structures, inhibit biosynthesis, reduce the permeability of cell membranes or seal cell walls, and interfere with bacterial decomposition and metabolism.

[0062] In addition, the extract of Litsea cubeba contains phosgene, which can produce an extremely uncomfortable and irritating smell for mosquitoes, thereby achieving an insect repellent effect. In addition, the extract of Litsea cubeba also contains aurantium, which can destroy the nervous system of mosquitoes, making it difficult for them to grow and reproduce normally. At the same time, aurantium can also change the pH and ion balance in the mosquito's body, making it difficult for mosquitoes to survive.

[0063] Referring to Examples 4-5 and in combination with Table 4, it can be seen that, relative to Example 4, the number of mosquito escapes and the antibacterial rate of Example 5 are further improved, which indicates that the addition of vinyl polydimethylsiloxane can further enhance the antibacterial and insect repellent effect of bamboo activated carbon.

[0064] The reason is that when the silane coupling agent, clove extract and Litsea cubeba extract are mixed and stirred, the prepared extract-modified bamboo activated carbon will have a better antibacterial and insect repellent effect. The reason may be that the silanol bond obtained by hydrolysis of siloxane will react and connect with the eugenol in the clove extract. At the same time, the silanol bond will produce a condensation reaction with the hydroxyl group generated when the bamboo activated carbon is modified by magnesium. The citral in the Litsea cubeba extract can directly undergo a cross-linking reaction with the hydroxyl group generated when the bamboo activated carbon is modified by magnesium, thereby obtaining a bamboo activated carbon-eugenol-citral cross-linking network, effectively improving the compatibility between the components of the extract-modified bamboo activated carbon, and effectively improving the migration and precipitation resistance of the natural antibacterial and insect repellent extract.

[0065] Referring to Examples 5-7 and combining with Table 4, it can be seen that compared with Example 5, the number of mosquito escapes and the antibacterial rate of Examples 6-7 are slightly reduced. This shows that when the clove extract and the Litsea cubeba extract are used in the mass ratio of Example 5, the prepared bamboo activated carbon will have a better antibacterial and insect repellent effect.

[0066] With reference to Example 5 and Example 8 and in combination with Table 4, it can be seen that, relative to Example 5, the number of mosquito escapes and the antibacterial rate of Example 8 are significantly reduced, which indicates that the treatment sequence of organic acid treatment and attachment of natural antibacterial and insect repellent extracts also affects the antibacterial and insect repellent effect of bamboo activated carbon.

[0067] The reason may be that if organic acid modification is carried out first, the hydroxyl groups produced during the magnesium modification of bamboo activated carbon will be directly consumed by the organic acid, making it difficult to produce a bamboo activated carbon-eugenol-citral cross-linked network.

[0068] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A bamboo charcoal fertilizer made from bamboo activated carbon, characterized in that: The bamboo charcoal fertilizer made from bamboo activated carbon is obtained by adsorbing urine on magnesium-modified bamboo activated carbon, and the surface of the magnesium-modified bamboo activated carbon is treated with organic acid.

2. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 1, characterized in that: The preparation method of magnesium-modified bamboo activated carbon comprises the following steps: drying the bamboo activated carbon at 100-110°C for 10-14h, then soaking the dried bamboo activated carbon in a magnesium chloride aqueous solution for 10-14h, then taking it out and drying it at 100-110°C for 10-14h, then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon.

3. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 2, characterized in that: The preparation method of the magnesium-modified bamboo activated carbon is as follows: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, wherein the mass fraction of the magnesium chloride aqueous solution is between 5% and 15%, then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain the magnesium-modified bamboo activated carbon.

4. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 1, characterized in that: The magnesium-modified bamboo activated carbon is attached with a natural antibacterial and insect repellent extract, wherein the natural antibacterial and insect repellent extract comprises a clove extract and a litsea cubeba extract, and the mass ratio of the clove extract to the litsea cubeba extract is (1-3): (3-5).

5. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 4, characterized in that: The natural antibacterial and insect repellent extract also includes vinyl polydimethylsiloxane and KARSTEDT catalyst, and the added amount of vinyl polydimethylsiloxane is 10-20% of the total mass of the natural antibacterial and insect repellent extract, and the added amount of KARSTEDT catalyst is 1-3% of the total mass of the natural antibacterial and insect repellent extract.

6. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 4, characterized in that: The preparation method of the natural antibacterial and anthelmintic extract is as follows: first, the euphorbia litsea cubeba / clove is crushed and dried, then the clove powder is soaked in an acetone solvent and left to stand at a temperature of 20-30°C for 20-30h, then extracted three times with an acetone solution, and finally a 1g / ml euphorbia litsea cubeba / clove extract is obtained; then the clove extract, the euphorbia litsea cubeba extract, vinyl polydimethylsiloxane and a KARSTEDT catalyst are mixed to obtain the natural antibacterial and anthelmintic extract.

7. The bamboo charcoal fertilizer made from bamboo activated carbon according to claim 4, characterized in that: The steps of the organic acid treatment are: firstly, the magnesium-modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried.

8. A method for preparing bamboo charcoal fertilizer made from bamboo activated carbon according to any one of claims 1 to 7, characterized in that: The following steps are involved: Preparation of magnesium-modified bamboo activated carbon: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, wherein the mass fraction of the magnesium chloride aqueous solution is between 5% and 15%, then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon; Organic acid treatment: firstly, the magnesium-modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried to obtain the organic acid-modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.

9. A method for preparing bamboo charcoal fertilizer made from bamboo activated carbon according to claim 5, characterized in that: The following steps are involved: Preparation of magnesium-modified bamboo activated carbon: drying the bamboo activated carbon at 100-110°C for 10-14h, then taking 4-6g of the dried bamboo activated carbon and soaking it in 8-12ml of magnesium chloride aqueous solution for 10-14h, wherein the mass fraction of the magnesium chloride aqueous solution is between 5% and 15%, then taking it out and drying it at 100-110°C for 10-14h, and then placing the dried product in a muffle furnace, heating it to 400-500°C at a rate of 4-6°C / min and keeping it warm for 2-3h, and finally cooling it naturally to obtain magnesium-modified bamboo activated carbon; Modification of natural antibacterial and insect repellent extract: Mixing magnesium-modified bamboo activated carbon with natural antibacterial and insect repellent extract, wherein the mass ratio of magnesium-modified bamboo activated carbon to natural antibacterial and insect repellent extract is (3-5):1, and then drying to obtain extract-modified bamboo activated carbon; Organic acid treatment: firstly, the extract modified bamboo activated carbon is placed in an environment of 100-120°C for drying, then immersed in a 10-20% citric acid aqueous solution at a ratio of 1g:2ml, and shaken and immersed at a temperature of 20-40°C for 40-50h, and finally filtered and dried to obtain organic acid modified bamboo activated carbon; Preparation of bamboo charcoal fertilizer made from bamboo activated carbon: placing bamboo activated carbon modified with organic acid in urine for adsorption to obtain bamboo charcoal fertilizer made from bamboo activated carbon.