Modified biomass carbon for reducing effective state chromium in soil and preparation method and application of modified biomass carbon

A technology of biomass charcoal and biomass, which is applied in the fields of application, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of non-specific adsorption of heavy metals, molecular sieve modification fixation performance, and small particles of powdered activated carbon. Inexpensive, effective, enhance the effect of organic matter content

Inactive Publication Date: 2019-03-01
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, powdered activated carbon has small particles, large specific surface area, and strong adsorption capacity. It is a solid adsorbent that is easy to adsorb non-polar pollutants, but it has neither specificity nor high activity for heavy metal adsorption.
In the prior art, cetyltrimethylammonium bromide is used to modify NaY molecular sieve to adsorb heavy metal ions in sewage, but this method is only prepared by adsorbing cetyltrimethylammonium bromide on the surface of NaY molecular sieve material, and no further modification of the molecular sieve to enhance its own fixation performance

Method used

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  • Modified biomass carbon for reducing effective state chromium in soil and preparation method and application of modified biomass carbon
  • Modified biomass carbon for reducing effective state chromium in soil and preparation method and application of modified biomass carbon
  • Modified biomass carbon for reducing effective state chromium in soil and preparation method and application of modified biomass carbon

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preparation example Construction

[0028] A preparation method of modified biochar for reducing available chromium in soil, the steps are as follows:

[0029] Add a certain ratio of trimethylammonium salt, N,N'-methylenebisacrylamide and biomass activated carbon into the conical flask, and after standing in the dark for 10-24 hours, add an appropriate amount of initiator to it, and ultrasonically After dissolving, transfer it to a boric acid glass test tube, pass an inert gas to remove oxygen under ice bath conditions; then seal the test tube with a rubber stopper, put it in a water bath at 50-80°C and continue to react for 8-16 hours. After the reaction is over, wash the polymer and remove it. After drying, the final product modified biochar material can be obtained.

[0030] The trimethylammonium salt is a substance having both an ethylenic bond and a trimethylammonium group, which can be methacryloyloxyethyltrimethylammonium chloride and allyltrimethylammonium chloride, but not limited to this.

[0031] Th...

Embodiment 1

[0036] A modified biochar material for reducing available chromium in soil, the specific preparation method of which is as follows:

[0037] (i) Add 40mmol methacryloyloxyethyltrimethylammonium chloride solution, 40mmol N,N′-methylenebisacrylamide solution, and 20g coconut shell charcoal into a 50mL Erlenmeyer flask, and place it in a dark environment set for 10 hours;

[0038] (ii) Add 40 mmol potassium persulfate to the Erlenmeyer flask of step (i), ultrasonically dissolve the mixed solution and transfer it to a boric acid glass test tube, pass nitrogen gas to remove oxygen under ice bath conditions, cover with a rubber stopper and seal it well before putting it into Polymerization was initiated in a water bath at 60°C for 8 hours;

[0039] (iii) A polymer obtained by breaking up the adhered polymer after the reaction is completed. The product was put into a Buchner funnel for suction filtration and washing, repeated extraction and elution with water and methanol, and the ...

Embodiment 2

[0041] A modified biochar material for reducing available chromium in soil, the specific preparation method of which is as follows:

[0042] (i) Add 80mmol methacryloyloxyethyltrimethylammonium chloride solution, 40mmol N,N'-methylenebisacrylamide solution, and 50g bamboo charcoal into a 50mL Erlenmeyer flask, and let it stand in the dark for 24 hours later;

[0043] (ii) Add 40 mmol potassium persulfate to the Erlenmeyer flask of step (i), ultrasonically dissolve the mixed solution and transfer it to a boric acid glass test tube, pass argon to deoxygenate under ice bath conditions, cover with a rubber stopper and seal it well Throw it into a 70°C water bath to initiate polymerization and last for 12 hours;

[0044] (iii) After the reaction is completed, crush the adhered polymer to obtain the polymer, put the product into a Buchner funnel for suction filtration and washing, repeatedly extract and elute with water and methanol, and obtain the final product after drying.

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Abstract

The invention relates to modified biomass carbon for reducing effective state chromium in soil and a preparation method and application of the modified biomass carbon. The modified biomass carbon is biomass carbon grafted with a trimethyl ammonium salt, and the specific preparation method comprises the steps that the trimethyl ammonium salt, N,N'-methylenebisacrylamide are mixed with biomass activated carbon, and standing treatment away from light is performed; an initiator is added for ultrasonic dissolution, and inert gas is introduced into a reaction solution under the ice bath condition toremove oxygen; the reaction solution is sealed and heated in a water bath, and the reaction is initiated and continued; and after the reaction is completed, a product is collected and subjected to washing and drying operations to finally obtain the modified biomass carbon. Compared with the prior art, the modified biomass carbon for reducing the effective state chromium in the soil and the preparation method and application of the modified biomass carbon realize the selective fixed repair of the heavy metal chromium in the soil, and a soil heavy metal fixing agent with a low cost, high capacity and high selectivity is developed.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil pollution control, in particular to a modified biochar for reducing available chromium in soil, a preparation method and application thereof. Background technique [0002] As the carrier of human existence, soil is increasingly polluted by industrial pollutants, mining of minerals, and excessive application of pesticides and fertilizers. The total area of ​​China's farmland soil polluted by heavy metals can reach 200,000 square kilometers, accounting for about 20% of the country's farmland soil, and agricultural products with excessive heavy metals account for more than 80% of the total area of ​​agricultural products with excessive pollutants. Heavy metals in polluted soil can accumulate in plants and animals and enter the food chain, and then enter the human body, causing great harm to human health. Therefore, it is an important measure to control heavy metal pollution in farmland soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/42B01J20/20B01J20/30
CPCC09K17/42B01J20/20
Inventor 唐建设项丽王翔翔崔兆行吴焕乐
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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