A cuttlebone-derived material, its preparation method and application

Abstract

This invention provides a cuttlebone-derived material, its preparation method, and its application, belonging to the technical field of water purification. In this invention, cuttlebone is mainly composed of calcium carbonate and chitin complex protein. Lead has a strong coordination effect with the hydroxyl and amino functional groups on chitin, and lead is adsorbed by calcium carbonate through ion exchange and surface precipitation. Furthermore, the natural macroporous structure of cuttlebone facilitates rapid and efficient lead adsorption. Calcination at 500°C in the absence of oxygen causes the calcium carbonate component in the cuttlebone to transform from an aragonite crystal form to a calcite crystal form. The calcite crystal form has a stronger ion exchange capacity for lead than the aragonite crystal form, thus improving the adsorption performance of the cuttlebone raw material.

Description

Technical Field

[0001] This invention belongs to the technical field of water purification, specifically relating to a cuttlebone-derived material, its preparation method, and its application. Background Technology

[0002] Lead is a heavy metal that seriously endangers human health. It has a bioaccumulating tendency in aquatic environments. When lead is absorbed and accumulated by plants or animals, it enters the human body through the food chain, thus harming human health. In recent years, due to the illegal discharge of lead-containing wastewater and exhaust gas by lead mining and smelting enterprises and battery manufacturing enterprises, as well as the indiscriminate dumping of lead-containing waste residue, lead pollution incidents have occurred frequently, resulting in elevated blood lead levels in children and even adults.

[0003] Currently, the main technologies used for lead pollution removal in water bodies include chemical precipitation, electrocoagulation, ion exchange, membrane separation, and adsorption. Adsorption technology can effectively remove lead from water bodies and plays an irreplaceable role in water pollution control and water purification. However, many heavy metal adsorbents currently suffer from low adsorption capacity, which severely limits their promotion and application. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a cuttlebone-derived material, its preparation method, and its application. The cuttlebone-derived material provided by this invention can achieve highly efficient lead adsorption.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a method for preparing cuttlebone-derived materials, comprising the following steps:

[0007] Cuttlebone powder was calcined under oxygen-free conditions to obtain cuttlebone-derived materials; the calcination temperature was 500℃ and the holding time was 2h.

[0008] Preferably, the cuttlebone powder has a particle size of <0.150 mm.

[0009] Preferably, the cuttlebone powder is obtained by sequentially deshelling, grinding, washing, centrifuging, drying, and first sieving of cuttlebone raw materials.

[0010] Preferably, the centrifugation speed is 3000-4500 rpm and the time is 5-8 min; the drying temperature is 85-105℃ and the time is 60-72 h.

[0011] Preferably, after the calcination is completed, the obtained cuttlebone material is further cooled and then sieved; the particle size after the second sieve is <0.150mm.

[0012] Preferably, the oxygen-isolation condition is a nitrogen atmosphere; the nitrogen flow rate is 50-100 mL / min.

[0013] This invention provides cuttlebone-derived materials prepared by the preparation method described above.

[0014] This invention provides the application of the cuttlebone-derived material described above as an adsorbent for adsorbing lead ions in water.

[0015] Preferably, the concentration of lead ions is 2-40 mg / L; the mass ratio of the cuttlebone-derived material to the volume of water containing lead ions is 2.4 mg: 250 mL.

[0016] Preferably, the adsorption temperature is 20-25°C and the time is 60-120 hours.

[0017] This invention provides a method for preparing cuttlebone-derived materials, comprising the following steps: calcining cuttlebone powder under oxygen-free conditions to obtain cuttlebone-derived materials; the calcination temperature is 500℃, and the holding time is 2 hours. In this invention, cuttlebone is mainly composed of calcium carbonate and chitin complex protein. Lead has a strong coordination effect with the hydroxyl and amino functional groups on chitin, and lead is adsorbed by calcium carbonate through ion exchange and surface precipitation. Furthermore, the natural macroporous structure of cuttlebone is conducive to the rapid and efficient adsorption of lead. By calcining under oxygen-free conditions at a temperature of 500℃, the crystal form of calcium carbonate in cuttlebone is transformed from aragonite to calcite. The calcite crystal form has a stronger ion exchange capacity for lead than the aragonite crystal form, thus improving the adsorption performance of the cuttlebone raw material.

[0018] Furthermore, the cuttlebone-derived material provided by this invention efficiently adsorbs lead through ion exchange and organic complexation. The macroporous structure of the material itself facilitates the rapid adsorption of lead. The main framework of the cuttlebone is composed of calcium carbonate, which can increase the pH of the environment and facilitate the fixation of heavy metal lead.

[0019] The cuttlebone raw material described in this invention is widely available, inexpensive, and has low production costs, making mass production and utilization possible and providing a foundation for the sustainable utilization of fishery waste resources.

[0020] The method for preparing cuttlebone-derived materials provided by this invention is practical, low-cost, has a high adsorption capacity for pollutants, and can improve environmental conditions. It has significant application prospects in the field of heavy metal pollution control, such as lead pollution. The method for preparing cuttlebone-derived materials provided by this invention is simple and does not require the addition of additional complexes, such as milk powder and soybean powder. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a scanning electron microscope (SEM) image of the original cuttlebone material used in this invention.

[0023] Figure 2 This is a scanning electron microscope (SEM) image of the surface of the cuttlebone-derived material in this invention;

[0024] Figure 3 The X-ray diffraction (XRD) patterns of the original and derived cuttlebone materials in this invention are shown.

[0025] Figure 4 The cuttlebone raw material and derived materials in this invention are related to Pb 2+ Adsorption kinetics of the solution. Detailed Implementation

[0026] This invention provides a method for preparing cuttlebone-derived materials, comprising the following steps:

[0027] Cuttlebone powder was calcined under oxygen-free conditions to obtain cuttlebone-derived materials; the calcination temperature was 500℃ and the holding time was 2h.

[0028] In this invention, the cuttlebone powder is preferably obtained by sequentially deshelling, grinding, washing, centrifuging, drying, and first sieving of cuttlebone raw materials.

[0029] In this invention, the cuttlebone raw material is collected from the coastal areas of Hainan. The cuttlebone raw material used in this invention is widely available, inexpensive, and has low production costs, making mass production and utilization possible and providing a foundation for the sustainable utilization of fishery waste resources. In this invention, the shelling process preferably uses a tool to separate the inner shell from the outer shell; the tool is preferably a spatula; the grinding process preferably uses an agate mortar and pestle to grind the inner shell of the cuttlebone. In this invention, the washing process preferably uses ultrapure water; the washing solution is preferably washed until the pH value is 9.8. In this invention, the centrifugation speed is preferably 3000-4500 rpm, more preferably 3500-4200 rpm, and even more preferably 3800-4000 rpm; the centrifugation time is preferably 5-8 min, more preferably 6-7 min; the drying temperature is preferably 85-105℃, more preferably 90-100℃, and even more preferably 93-97℃; the drying time is preferably 60-72 h, more preferably 62-70 h, and even more preferably 65-68 h; the first sieving is preferably through a 100-mesh sieve; and the particle size of the cuttlebone powder is preferably <0.150 mm.

[0030] After obtaining the cuttlebone powder, the present invention calcines the cuttlebone powder under oxygen-free conditions to obtain cuttlebone-derived materials.

[0031] In this invention, the calcination is preferably carried out in a tube furnace; the calcination temperature is 500°C. Preferably, the temperature is increased from room temperature to the calcination temperature at a rate of 10°C / min; the holding time for calcination is 2 hours.

[0032] In this invention, the oxygen-isolated condition is preferably a nitrogen atmosphere; the nitrogen flow rate is preferably 50-100 mL / min, more preferably 60-90 mL / min, and even more preferably 70-80 mL / min. In this invention, calcination at 500°C in the absence of oxygen causes the calcium carbonate crystal form in cuttlebone to transform from aragonite to calcite. The calcite crystal form has a stronger ion exchange capacity for lead than the aragonite crystal form, thus improving the adsorption performance of the cuttlebone raw material.

[0033] After calcination, the present invention preferably further includes cooling and second sieving of the obtained cuttlebone material; the cooling is preferably to room temperature; the second sieving is preferably through a 100-mesh sieve, and the particle size after the second sieving is preferably <0.150 mm. In the present invention, the cooling is preferably natural cooling.

[0034] This invention provides cuttlebone-derived materials prepared by the preparation method described above.

[0035] The cuttlebone-derived material provided by this invention efficiently adsorbs lead through ion exchange and organic complexation. The macroporous structure of the material itself facilitates rapid lead adsorption. The main framework of the cuttlebone is composed of calcium carbonate, which increases the pH of the environment, thus aiding in the fixation of heavy metal lead. Furthermore, the skeleton of the cuttlebone-derived material prepared by this invention is calcite-type calcium carbonate. The calcite crystal form exhibits stronger ion exchange for lead than the aragonite crystal form, thereby enhancing the adsorption performance of the cuttlebone raw material.

[0036] This invention provides the application of the cuttlebone-derived material described above as an adsorbent for adsorbing lead ions in water.

[0037] In this invention, the concentration of lead ions is preferably 2–40 mg / L, more preferably 5–30 mg / L, and even more preferably 10–25 mg / L; the mass ratio of the cuttlebone-derived material to the volume of water containing lead ions is preferably 2.4 mg:250 mL. In this invention, the adsorption temperature is preferably 20–25°C, and the adsorption time is preferably 60–120 h, more preferably 65–100 h, and even more preferably 70–80 h. In this invention, the lead ions are preferably Pb. 2+ The pH value of the water containing lead ions is preferably 6 ± 0.1.

[0038] In this invention, cuttlebone is mainly composed of calcium carbonate and chitin complex protein. Lead has a strong coordination effect with the hydroxyl and amino functional groups on chitin. Lead is adsorbed by calcium carbonate through ion exchange and surface precipitation. Moreover, the natural macroporous structure of cuttlebone is conducive to the rapid and efficient adsorption of lead. By calcining under the condition of isolating oxygen and at a temperature of 500°C, the crystal form of calcium carbonate in cuttlebone is changed from aragonite to calcite. The calcite crystal form has a stronger ion exchange effect on lead than the aragonite crystal form, thus improving the adsorption performance of cuttlebone raw materials.

[0039] To further illustrate the present invention, the cuttlebone-derived materials, their preparation methods, and applications provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but these should not be construed as limiting the scope of protection of the present invention.

[0040] The cuttlebone raw material described in this embodiment of the invention was collected from the coastal area of ​​Hainan and processed by a seafood processing plant in Haozhou, Anhui.

[0041] Example 1

[0042] The inner shell of the cuttlebone was separated from the dorsal shield of the outer shell using a spatula. The inner shell was then ground using an agate mortar and pestle. The cuttlebone was then washed with ultrapure water until the pH of the washing solution stabilized at 9.8. After centrifugation at 4500 rpm for 5 minutes, the cuttlebone was dried at 105°C for 72 hours. Finally, the powder was passed through a 100-mesh sieve to obtain cuttlebone powder with a particle size of <0.15 mm, which was used as the raw material for cuttlebone. Figure 1 The image shows a SEM image of the original cuttlebone material, which reveals the macroporous skeleton and organic membrane covering the material.

[0043] The raw cuttlebone material was calcined in a tube furnace under oxygen-free conditions, with a nitrogen flow rate of 50 mL / min. The calcination temperature was raised from room temperature to 500°C and held for 2 hours at a rate of 10°C / min for 1 hour. The material was then cooled to room temperature for 2 hours. Finally, the material was passed through a 100-mesh sieve to obtain cuttlebone-derived material with a particle size of <0.15 mm. Figure 2 The image shows a SEM image of cuttlebone-derived material, from which changes in the organic membrane within the material can be observed. Figure 3 The image shows the XRD pattern of the cuttlebone-derived material. It can be seen from the image that the crystal form of the calcium carbonate component of the material changes from aragonite to calcite.

[0044] Comparative Application Example 1

[0045] The cuttlebone raw material prepared in Example 1 was used to adsorb divalent lead ions in water.

[0046] Pb was prepared using lead nitrate powder and deionized water. 2+ A lead nitrate solution with a concentration of 40 mg / L and a pH of 6 ± 0.1 (the pH of the lead nitrate solution was adjusted with 1 mol / L HCl and 1 mol / L NaOH);

[0047] 2.4 mg of cuttlebone raw material was weighed into a 300 mL reagent bottle as an adsorbent, and 250 mL of lead nitrate solution was added to ensure sufficient contact between the adsorbent and the aqueous phase. After mixing thoroughly, the mixture was allowed to stand for adsorption. The adsorption reaction was carried out at a temperature of 23–27 °C for 120 h. After adsorption was completed, the amount of unadsorbed Pb in the solution was determined using an atomic absorption spectrophotometer. 2+ The absorbance Abs was used to calculate the adsorption equilibrium concentration using the standard curve. e (Abs=0.0059*C e R 2 =0.9999). Pb 2+ The formula for calculating the adsorption capacity is:

[0048]

[0049] In the formula, Q represents the total adsorption amount, and C0 represents the Pb content. 2+ The initial concentration (mg / L), C e For Pb 2+ The adsorption equilibrium concentration (mg / L), V is the total volume of the solution (mL), and M is the dry weight of the adsorbent (mg);

[0050] In the above adsorption process, when the adsorption reaction time was 120 h, the adsorption capacity of the cuttlebone raw material for lead reached 1624.56 mg / g. For example... Figure 4 As shown, the cuttlebone raw material is effective against Pb. 2+ It has an extremely high adsorption capacity.

[0051] Application Example 1

[0052] The cuttlebone-derived material prepared in Example 1 was used to adsorb divalent lead ions in water.

[0053] Pb was prepared using lead nitrate powder and deionized water. 2+ A lead nitrate solution with a concentration of 40 mg / L and a pH of 6 ± 0.1 (the pH of the lead nitrate solution was adjusted with 1 mol / L HCl and 1 mol / L NaOH);

[0054] 2.4 mg of cuttlebone-derived material was weighed into a 300 mL Shuniu high-borosilicate blue-capped reagent bottle as an adsorbent. 250 mL of lead nitrate solution was added to ensure sufficient contact between the adsorbent and the aqueous phase. After mixing thoroughly, the mixture was allowed to stand for adsorption. The adsorption reaction was carried out at a temperature of 23–27 °C for 120 h. After adsorption was complete, the unadsorbed Pb in the solution was measured using an atomic absorption spectrophotometer. 2+ The absorbance Abs was used to calculate the adsorption equilibrium concentration using the standard curve. e (Abs=0.0059*C e R 2 =0.9999); Pb 2+ The formula for calculating the adsorption amount is shown in Application Example 1;

[0055] In the above adsorption process, when the adsorption reaction time was 120 h, the adsorption capacity of the cuttlebone-derived material for lead reached 2068.88 mg / g, which is better than that of the original cuttlebone material. The calcium carbonate component of the original material belongs to the aragonite crystal form. After pyrolysis modification at 500℃, the material changes from aragonite-type calcium carbonate to calcite-type calcium carbonate. The calcite crystal form has a stronger ion exchange capacity for lead than the aragonite crystal form. Therefore, the cuttlebone-derived material has a stronger adsorption capacity for lead. Figure 3 and Figure 4 As shown.

[0056] Compare and contrast examples 2-8

[0057] The cuttlebone raw material prepared in Example 1 was applied to lead ion solutions of different concentrations.

[0058] Pb was prepared using lead nitrate powder and deionized water. 2+ Lead nitrate solutions with concentrations of 2 mg / L, 5 mg / L, 10 mg / L, 15 mg / L, 20 mg / L, 30 mg / L, and 40 mg / L, and a pH of 6 ± 0.1 (the pH of the lead nitrate solution was adjusted with 1 mol / L HCl and 1 mol / L NaOH);

[0059] 2.4 mg of cuttlebone raw material was weighed into a 300 mL high borosilicate blue-capped reagent bottle as an adsorbent, and 250 mL of lead nitrate solution of different concentrations was added respectively. The adsorbent was ensured to be in full contact with the aqueous phase, mixed thoroughly, and allowed to stand for adsorption. The adsorption reaction temperature was 23–27 °C, and the adsorption reaction time was 120 h. After adsorption was complete, the unadsorbed Pb in the solution was measured using an atomic absorption spectrophotometer. 2+ The absorbance Abs was used to calculate the adsorption equilibrium concentration using the standard curve. e (Abs=0.0059*C e R 2 =0.9999), thus obtaining the relationship between equilibrium concentration and adsorption capacity; Pb 2+ The formula for calculating the adsorption capacity is shown in Application Example 1;

[0060] The adsorption capacity of cuttlebone raw material for lead ion solutions of different concentrations during the above adsorption process is shown in Table 1.

[0061] Table 1. Adsorption capacity of cuttlebone raw material for lead ion solutions of different concentrations.

[0062]

[0063] As shown in Table 1, the adsorption capacity of cuttlebone raw material for lead ions increases with increasing lead ion concentration. When the concentration reaches 40 mg / L, the adsorption capacity reaches 1624.56 mg / g.

[0064] Application Examples 2-8

[0065] The cuttlebone-derived material prepared in Example 1 was applied to lead ion solutions of different concentrations.

[0066] Pb was prepared using lead nitrate powder and deionized water. 2+Lead nitrate solutions with concentrations of 2 mg / L, 5 mg / L, 10 mg / L, 15 mg / L, 20 mg / L, 30 mg / L, and 40 mg / L, and a pH of 6 ± 0.1 (the pH of the lead nitrate solution was adjusted with 1 mol / L HCl and 1 mol / L NaOH);

[0067] 2.4 mg of cuttlebone-derived material was weighed into a 300 mL Shuniu high-borosilicate blue-capped reagent bottle as an adsorbent. 250 mL of lead nitrate solution of different concentrations was added to each bottle. The adsorbent was ensured to be in full contact with the aqueous phase, and after thorough mixing, the mixture was allowed to stand for adsorption. The adsorption reaction was carried out at 23–27 °C for 120 h. After adsorption was complete, the unadsorbed Pb in the solution was measured using an atomic absorption spectrophotometer. 2+ The absorbance Abs was used to calculate the adsorption equilibrium concentration using the standard curve. e (Abs=0.0059*C e R 2 =0.9999), thus obtaining the relationship between equilibrium concentration and adsorption capacity; Pb 2+ The formula for calculating the adsorption capacity is shown in Application Example 1;

[0068] The adsorption capacity of cuttlebone-derived materials for lead ion solutions of different concentrations during the above adsorption process is shown in Table 2.

[0069] Table 2. Adsorption capacity of cuttlebone-derived materials for lead ion solutions of different concentrations.

[0070] serial number Application Example 2 Application Example 3 Application Example 4 Application Example 5 Application Example 6 Application Example 7 Application Example 8 Concentration (mg / L) 2 5 10 15 20 30 40 Adsorption capacity (mg / g) 190.80 494.14 1017.87 1420.46 1650.25 1643.14 2068.88

[0071] As shown in Table 2, with the increase of lead ion concentration, the adsorption capacity of cuttlebone-derived materials for lead ions initially increased significantly, and then the increase tended to level off. When the concentration reached 40 mg / L, the adsorption capacity reached 2068.88 mg / g.

[0072] Compare and contrast examples 9-13

[0073] The adsorption method was the same as in Application Example 1 or Application Example 2, except that the adsorbents were crayfish shell material (Study on the adsorption characteristics and mechanism of heavy metals in wastewater by crayfish shell and its biomimetic synthetics), calcium alginate / UIO-66-(OH)2 composite gel (CN202211415330.8), modified chitosan adsorbent (CN201910337357.1), selective carbon nanotubes (CN201410133247.0), and sludge-based magnetic biochar (CN202111515883.6). The adsorption capacity measured was the adsorption capacity measured when each adsorbent reached adsorption equilibrium (adsorption time was different). The adsorption comparison results are shown in Table 3.

[0074] 1. The preparation process of the crayfish shell material (adsorption characteristics and mechanism of crayfish shell and its biomimetic synthetic compounds on heavy metals in wastewater) is as follows:

[0075] Discarded crayfish shells were collected, washed with tap water, and dried in the sun. They were then dried in a forced-air drying oven at 105℃. The dried samples were then pulverized using a high-frequency vibrating cryogenic ball mill for 60 minutes to obtain crayfish shell material.

[0076] 2. The preparation process of the calcium alginate / UIO-66-(OH)2 composite gel (CN202211415330.8) is as follows:

[0077] 250 mg of zirconium chloride, 294 mg of 2,5-dihydroxyterephthalic acid, and 2 mL of 37% hydrochloric acid were added to 30 mL of N,N-dimethylformamide. The solution was transferred to a polytetrafluoroethylene reactor and heated in an oven at 80 °C for 24 h. The yellow solid was collected by centrifugation, washed three times with DMF at room temperature, and dried in a vacuum drying oven at 60 °C to obtain UIO-66-(OH)2. Solution A was prepared by adding UIO-66-(OH)2 and sodium alginate to 20 mL of deionized water at certain mass ratios of 1:1, 1:2, and 2:1, respectively, and stirring the mixture for 1.5 h. Solution B was prepared by dissolving 200 mg of calcium chloride in 10 mL of deionized water. Solution B was added to solution A, solidified for 1 h, washed with deionized water, and freeze-dried overnight to obtain calcium alginate / UIO-66-(OH)2 composite gel.

[0078] 3. The preparation process of the modified chitosan adsorbent (CN201910337357.1) is as follows:

[0079] 0.5 g of methacrylic acid and 0.75 g of divinylbenzene were dissolved in 10 mL of ethanol, and 0.03 g of azobisisobutyronitrile (AIB) was added as an initiator. The mixture was stirred at room temperature for 2 h and then placed in a reaction vessel. 0.25 g of chitosan was dissolved in 5 mL of 8% acetic acid solution. After stirring until dissolved, the solution was poured into the reaction vessel and stirred thoroughly. The reaction was carried out in a high-pressure reactor at 120 °C for 24 h to obtain a divinylbenzene-methacrylic acid-chitosan (DVB / MAA / CTS) copolymer. The solution was removed by filtration, washed with anhydrous ethanol, and dried in a vacuum drying oven at 60 °C for 4 h.

[0080] 0.5 g of divinylbenzene-methacrylic acid-chitosan (DVB / MAA / CTS) copolymer was thoroughly ground and placed in a 50 mL flask. 20 mL of 0.1 mol / L sodium ethoxide solution was added, and 2 mL of carbon disulfide was added dropwise under a cold water bath. The reaction was carried out at 40 °C for 24 h. After the reaction, the mixture was washed with dilute hydrochloric acid, dilute NaOH, and anhydrous ethanol, respectively, and then dried in a vacuum drying oven at 60 °C for 4 h to obtain the polymer DTC-DVB / MAA / CTS containing dithiocarbamate functional groups, i.e., the modified chitosan adsorbent.

[0081] 4. The preparation process of selective carbon nanotubes (CN201410133247.0) is as follows:

[0082] Take 9g of aminated carbon nanotubes and 100mL of distilled water, and add them separately to a three-necked flask. Disperse the mixture using ultrasound at room temperature for 60min to ensure uniform dispersion of the aminated carbon nanotubes. Then add 1g of lead nitrate and react with magnetic stirring at 85℃ for 3h to allow the aminated carbon nanotubes to react with Pb. 2+ Allow the reaction to proceed completely. After the reaction is complete, filter the solution, dry it under vacuum at 80°C for 12 hours, and grind it into powder. Wash with 6 mol / L hydrochloric acid solution until Pb is undetectable. 2+ The solution was then washed with 1 mol / L NaOH solution and distilled water until it was neutral. After filtration, the solution was dried under vacuum at 80°C for 12 hours to obtain carbon nanotubes that selectively adsorb lead ions. The mass ratio of aminated carbon nanotubes to lead nitrate was 9:1.

[0083] 5. The preparation process of the sludge-based magnetic biochar (CN202111515883.6) is as follows:

[0084] Municipal sludge with a moisture content of less than 2% after air drying was ground and passed through a 60-mesh sieve to obtain sludge particles (with a particle size of less than 0.25 mm). 5 g of sludge particles were mixed with 0.4149 g of nano-ferric oxide (Fe3O4) and heated for pyrolysis (pyrolysis temperature 800℃, pyrolysis time 120 min) to obtain a solid product. The solid product was then ground and passed through a 60-mesh sieve to obtain granules, which constitute the sludge-based magnetic adsorption material (the mass ratio of iron provided by nano-ferric oxide to sludge particles in this material is set to 2%).

[0085] Table 3. Effects of different adsorbents on Pb 2+ adsorption effect

[0086]

[0087] As can be seen from Table 3, the cuttlebone raw material and cuttlebone derived material of this invention have a positive effect on Pb. 2+ Its adsorption capacity is significantly higher than that of other adsorbent materials.

[0088] As can be seen from the above examples and comparative examples, the cuttlebone-derived material prepared according to the method of the present invention has a good effect on Pb in water. 2+ It has a very good adsorption effect.

[0089] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. Application of cuttlebone-derived material as adsorbent to adsorb lead ions in water body; The cuttlebone mainly consists of calcium carbonate and chitin complex protein; the cuttlebone-derived material has a calcite crystal type calcium carbonate skeleton; The concentration of lead ions in the water body is 2-40 mg / L; the mass of the cuttlebone-derived material to the volume of the water body containing lead ions is 2.4 mg: 250 mL; the pH of the water body containing lead ions is 6±0.1; The adsorption temperature is 20-25℃, and the time is 60-120 h; The preparation method of the cuttlebone-derived material comprises the following steps: The cuttlebone powder is calcined under an oxygen-free condition to obtain the cuttlebone-derived material; the calcination temperature is 500℃, the heating rate is 10℃ / min, and the holding time is 2 h; The oxygen-free condition is a nitrogen atmosphere; the nitrogen gas flow rate is 50-100 mL / min.

2. Use according to claim 1, characterized in that, The particle size of the cuttlebone powder is <0.150 mm.

3. Use according to claim 1 or 2, characterized in that, The cuttlebone powder is obtained by sequentially removing the shell, grinding, washing, centrifuging, drying, and first sieving the cuttlebone raw material.

4. Use according to claim 3, characterized in that, The centrifugation speed is 3000-4500 rpm, and the time is 5-8 min; the drying temperature is 85-105℃, and the time is 60-72 h.

5. Use according to claim 3, characterized in that, After the calcination is completed, the obtained cuttlebone material is cooled and second sieved; the particle size after the second sieving is <0.150 mm.

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