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Multi-amino carbon composite material for selectively fixing mercury, chromium and lead in polluted soil and preparation method

A technology of polluted soil and composite materials, which is applied in the field of soil environmental safety and resource reuse, can solve the problems of low selectivity and small adsorption capacity of heavy metals in soil, and achieve the effect of large adsorption capacity, low cost and strong selectivity

Inactive Publication Date: 2015-09-30
NANJING AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the actual problems that the existing biochar has little adsorption capacity and low selectivity for soil heavy metals, and provides a kind of ethylenediamine that can selectively passivate soil heavy metals mercury (II), chromium (III) and lead (II). Preparation method of modified biochar composite material

Method used

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  • Multi-amino carbon composite material for selectively fixing mercury, chromium and lead in polluted soil and preparation method
  • Multi-amino carbon composite material for selectively fixing mercury, chromium and lead in polluted soil and preparation method
  • Multi-amino carbon composite material for selectively fixing mercury, chromium and lead in polluted soil and preparation method

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Effect test

example 1

[0022] Soak the washed and dried bagasse powder and phosphoric acid at a mass ratio of 1:1 for 12 hours, place the soaked bagasse powder in an oven at 60°C, pre-carbonize for 10 hours, put it in a microwave reactor, and heat it at 50ml / min Under the protection of the nitrogen flow, the bagasse biochar was obtained by constant temperature activation under the condition of 900W for 22 minutes. The above 5g of biochar was stirred and purified at 60°C for 5 hours with a mass fraction of 10% HCl solution, then the purified biochar powder was added with 300ml of 32.5% nitric acid and stirred for 5 hours, and the above-mentioned nitric acid was weighed. 5g of charcoal powder, add 100ml of ethylenediamine, stir and heat evenly, then add 5g of N,N'-dicyclohexylcarbodiimide, and reflux for 48 hours. The product was washed and dried to obtain a novel polyamine-based biochar composite material. Infrared spectra of biochar materials before and after amination modification figure 1 shown....

example 2

[0024] Soak the washed and dried cotton stalk powder and 80% potassium hydroxide for 12 hours at a mass ratio of 1:2, put the soaked cotton stalk powder in a vacuum dryer for drying, and then put it into the tube type In the furnace, under the protection of a nitrogen flow of 50ml / min, the temperature was raised to 400°C at 5°C / min, and carbonized at this temperature for 2 hours, and then the temperature was raised to 700°C at 10°C / min to activate the cotton stalk biomass carbon. The above-mentioned 5g biochar powder was stirred with 10% HCl solution at 60°C for 5 hours, and then 300ml of 32.5% nitric acid was added to the purified biochar powder and stirred for 5 hours, then it was washed to neutral drying for subsequent use. Weigh 5 g of the above powder, add 100 ml of ethylenediamine, stir and heat, then add N,N'-dicyclohexylcarbodiimide, and react under reflux for 48 hours. The product was washed and dried to obtain a novel polyamine-based biochar composite material.

example 3

[0026] Soak the washed and dried water wheat stalk powder and 30% phosphoric acid at a mass ratio of 2:1 for 12 hours, dry the soaked water wheat stalk powder and put it in a tube furnace, and heat it at 50ml / Under the protection of a nitrogen flow of min, the temperature was raised to 500°C at 5°C / min, and carbonized at this temperature for 1.5 hours. After cooling, it was washed with distilled water until the pH was 7.0. Finally, put the cleaned product into an oven to dry at 105°C. 10g of the above-mentioned biochar powder was stirred with 200ml 10% HCl solution at 60°C for 5 hours, then the purified biochar powder was stirred with 200ml of 32.5% nitric acid for 3 hours, then it was washed to neutral drying. Add 200ml of ethylenediamine to the above sample. After stirring and heating, N,N'-dicyclohexylcarbodiimide was added and refluxed for 36 hours. The product was washed and dried to obtain a novel polyamine-based biochar composite material.

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Abstract

The invention provides a preparation method of an ethylenediamine grafted modified biomass carbon composite material for selectively fixing metal mercury (II), chromium (III) and lead (II) in soil, aiming at solving the actual problems that an existing passivant has small adsorption capacity on heavy metal of the soil, low selectivity and bad safety. The novel multi-amino biomass carbon composite material agent takes common substances including agricultural straw biomass, hydrochloric acid, nitric acid, ethylenediamine and the like as raw materials and is prepared through carbonization, carboxylation and molecule copolycondensation, and has abundant pore channels and abundant content of surface multi-amino groups; and the product has large fixed capacity and good selectivity on mercury (II), chromium (III) and lead (II) in the heavy metal polluted soil, has the advantages of simple process, easiness for implementation and the like, and can be produced in a large batch.

Description

technical field [0001] The invention belongs to the technical field of soil environment safety and resource reuse, and in particular relates to a polyamine-based biochar composite material for selective passivation of mercury, chromium and lead in heavy metal polluted soil and a preparation method thereof. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. As my country's economy grows and the scale of industrial production continues to expand, soil heavy metal pollution has become one of the most polluted and most harmful environmental problems in China. According to the incomplete survey and statistics of the State Environmental Protection Administration, China's polluted cultivated land is about 10 million hm 2 , 216.67hm of arable land irrigated with sewage 2 , solid waste stockpiles occupy an area of ​​133,300 hm and destroy fields 2 , ac...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00
Inventor 李坤权杨美蓉朱志强贾佳祺王春月徐恩兵柴强飞陆凯乔小朵
Owner NANJING AGRICULTURAL UNIVERSITY
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