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Modified charcoal capable of improving adsorptive property of nitrogen and phosphorus in soil and preparation method and application thereof

A technology of adsorption performance and biochar, applied in the field of modified biochar and its preparation, can solve the problems of difficult popularization and application, high price, cumbersome operation, etc., and achieve the effect of low cost, simple steps, and reduced fertilizer application

Inactive Publication Date: 2018-05-29
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The best iron-modified biochar prepared and optimized by this modification method greatly enhanced the ability of biochar to adsorb nitrate nitrogen and soluble phosphorus, and delayed and reduced the leaching of nitrate nitrogen and soluble phosphorus in the soil column leaching test. loss, but the operation is cumbersome and expensive, and it is difficult to popularize and apply in the field test

Method used

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  • Modified charcoal capable of improving adsorptive property of nitrogen and phosphorus in soil and preparation method and application thereof
  • Modified charcoal capable of improving adsorptive property of nitrogen and phosphorus in soil and preparation method and application thereof
  • Modified charcoal capable of improving adsorptive property of nitrogen and phosphorus in soil and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of iron, calcium and magnesium modified water hyacinth charcoal

[0029] At room temperature, weigh 4 parts of crushed water hyacinth equivalent to 100g dry weight (through a 1mm sieve) and put them in a 2L mixing bucket, and soak them in 1L deionized water (with no metal ions as CK, the following same) and FeCl 3 , CaCl 2 , MgCl 2 In solution (Fe 3+ , Ca 2+ , Mg 2+ The mass ratio of water hyacinth to water hyacinth is 0.40:1), stirred with a high-speed mixer for 2 hours, allowed to stand for 2 hours, and dried at 110°C. will be loaded with Fe 3+ , Ca 2+ , Mg 2+ The water hyacinth was placed in a porcelain crucible, placed in an atmosphere furnace, fed with nitrogen as a protective gas, heated to 450°C at a rate of 15°C / min, then carbonized at a constant temperature for 3 hours, cooled to room temperature, and ground through a 100-mesh sieve to obtain Unmodified water hyacinth charcoal samples (1 L of deionized water treated, CK) and iron, calci...

Embodiment 2

[0048] Example 2: Effect experiment of improving soil nitrogen and phosphorus adsorption performance by using modified biochar-based soil conditioner

[0049] The construction base of the agricultural non-point source pollution control demonstration project in Huiyang District, Huizhou City was used as the field test site, and eggplant was used as the field test material. According to the local fertilization type and dosage, the base fertilizer adopts iron-modified water hyacinth charcoal (prepared in Example 1) to partially replace chemical fertilizers. Based on the same amount of nitrogen and phosphorus applied, the following 5 treatments are set. Each treatment was repeated 3 times, and the area of ​​each plot was 38m 2 , completely randomly arranged, namely: (1) CK: no fertilization; (2) CF: customary fertilization; (3) RF 1 : Reduce fertilization by 10%; (4) RF 2 : Reduce fertilization by 15%; (5) RF 3 : Reduce fertilization by 20%. The specific iron-modified biochar ...

Embodiment 3

[0057] At room temperature, weigh 100g dry weight of crushed water hyacinth (screened to make the particle size 0.25-2mm) in a 4L mixing bucket, and soak it in 2L of FeCl 3 In solution (Fe 3+ The mass ratio of water hyacinth to water hyacinth is 1:1), stirring with a high-speed mixer for 1h, standing for 1h, and drying at 100°C to obtain Fe-loaded 3+ water hyacinth. will be loaded with Fe 3+ The water hyacinth was placed in a porcelain crucible, placed in an atmosphere furnace, fed with nitrogen as a protective gas, heated to 250°C at a rate of 5°C / min, and then carbonized at a constant temperature for 5 hours. After cooling to room temperature, it was ground through a 100-mesh sieve to obtain iron modified water hyacinth. Sexual biochar.

[0058] The iron-modified biochar of this example was tested according to the methods in Examples 1 and 2. The results showed that the BET specific surface area and total pore volume of the iron-modified biochar increased significantly, a...

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Abstract

The invention discloses a modified charcoal capable of improving the adsorptive property of nitrogen and phosphorus in soil and a preparation method and application thereof. The preparation method comprises the following steps: soaking smashed biomass with a metal salt solution, stirring, standing, drying for dehydration to obtain a mixture, putting the mixture into a porcelain crucible, and putting the porcelain crucible into an atmosphere furnace for carbonization to obtain the modified charcoal, wherein the metal salt solution is a ferric chloride, calcium chloride or magnesium chloride solution. The preparation method of the modified charcoal is simple in steps and low in cost, the prepared modified charcoal has good adsorptive property for nitrogen and phosphorus, after combined application of a fertilizer and the modified charcoal serving as a soil conditioner, the using amount of the fertilizer can be reduced, and the loss of nitrogen and phosphorus is reduced, so that the modified charcoal can be popularized and applied in field experiments.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizer reduction and efficiency enhancement for the prevention and control of agricultural non-point source pollution from planting industry, and specifically relates to a modified biochar capable of improving soil nitrogen and phosphorus adsorption performance and its preparation method and application. Background technique [0002] In 2014, the amount of chemical fertilizer used in my country reached 60 million tons, and the amount of chemical fertilizer used per unit of arable land was three times the world average level. lower than that of developed countries. Long-term excessive application of chemical fertilizers leads to a large accumulation of available nitrogen and phosphorus in cultivated land soil. According to the results report of "Pearl River Delta Cultivated Land Fertility Survey and Quality Evaluation", the content of nitrate nitrogen and available phosphorus in the cultivated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C05D9/00
CPCC05D9/00
Inventor 王珊柳勇王斯帆朱荣华王继增杨启豪欧计寅江振岳朱立安廖新荣
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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