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Wheat straw biochar adsorbing material for removing fluorine in water and preparation method thereof

A technology of wheat straw and adsorption materials, applied in water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of unsatisfactory defluorination efficiency of loaded lanthanum-aluminum modified biochar

Inactive Publication Date: 2020-04-03
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the modified liquid of lanthanum and aluminum salt is used to modify the biochar. The commonly used modification method is the impregnation-drying-sintering method, but the fluoride removal efficiency of the modified biochar loaded with lanthanum and aluminum is still not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Crush wheat straw, wash it, dry it, put it in a muffle furnace, and burn it under low oxygen conditions. After cooling, take it out and grind it through a 100-mesh sieve to obtain wheat straw biochar.

[0022] (2) Dissolve 3.46g of lanthanum nitrate and 4g of aluminum chloride in 100mL of deionized water to prepare a modifier mixture, then take 1g of wheat straw biochar and stir it to obtain a mixture containing wheat straw biochar-modifier mixed stock solution.

[0023] (3) Add a sodium hydroxide solution with a concentration of 3 mol / L to the mixed stock solution containing wheat straw biochar-modifier obtained by a peristaltic pump at a rate of 0.2 mL / min until the pH is 5.5, and continue stirring for 12 hours Filter, and wash the filter cake obtained by filtering with distilled water, and then with ethanol.

[0024] (4) Centrifuge the obtained dried and cleaned filter cake, and dry and grind the solid obtained by the centrifugation at a temperature of 105° C. t...

Embodiment 2

[0028] (1) Crush wheat straw, wash it, dry it, place it in a muffle furnace, and burn it under anaerobic conditions. After cooling, take it out and grind it through a 100-mesh sieve to obtain wheat straw biochar.

[0029] (2) Dissolve 3.03g of lanthanum nitrate and 2.67g of aluminum chloride in 100mL of deionized water to prepare a modifier mixture, then take 10g of wheat straw biochar and stir it to obtain wheat straw biochar-modified The mixed stock solution of the agent.

[0030] (3) Add a sodium hydroxide solution with a concentration of 4mol / L to the mixed stock solution containing wheat straw biochar-modifier obtained by a peristaltic pump at a rate of 0.05mL / min until the pH is 5.5, and continue stirring for 12 hours Filter, and wash the filter cake obtained by filtering with distilled water, and then with ethanol.

[0031] (4) Centrifuge the obtained dried and cleaned filter cake, and dry and grind the solid obtained by centrifugation at a temperature of 100° C. to ob...

Embodiment 3

[0034] (1) Crush wheat straw, wash it, dry it, put it in a muffle furnace, and burn it under low oxygen conditions. After cooling, take it out and grind it through a 100-mesh sieve to obtain wheat straw biochar.

[0035] (2) Dissolve 3.9g of lanthanum nitrate and 5.33g of aluminum chloride in 100mL of deionized water to prepare a modifier mixture, then take 1g of wheat straw biochar and stir it to obtain wheat straw biochar-modified The mixed stock solution of the agent.

[0036] (3) Add a sodium hydroxide solution with a concentration of 4mol / L to the mixed stock solution containing wheat straw biochar-modifier obtained by a peristaltic pump at a rate of 0.05mL / min until the pH is 5.5, and continue stirring for 12 hours Filter, and wash the filter cake obtained by filtering with distilled water, and then with ethanol.

[0037] (4) Centrifuge the obtained dried and cleaned filter cake, and dry and grind the solid obtained by the centrifugation at a temperature of 100° C. to o...

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PUM

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Abstract

The invention relates to the technical field of wastewater treatment. The invention discloses a wheat straw biochar adsorbing material for removing fluorine in water and a preparation method thereof.By adding biochar into a modifier solution containing lanthanum and aluminum and then slowly dropwise adding a sodium hydroxide solution to modify the biochar, an aluminum form with high charge and high polymerization degree is formed on a surface of the biochar, the fluorine removal performance of the modified biochar is improved in an acid-base range environment of which the pH value is less than 7, and the fluorine removal rate can be higher than 90% when the modified biochar adsorbs fluorine.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wheat straw biochar adsorption material used for removing fluorine in water and a preparation method thereof. Background technique [0002] Long-term drinking of water containing excessive fluoride will have adverse effects on human health. In today's field of fluoride removal technology, adsorption is considered to be a low-cost, simple and effective method for fluoride removal. When biochar is directly used as an adsorption material, the effect of removing fluorine is not ideal. In the prior art, metals are used to modify biochar to improve the adsorption capacity of fluorine. [0003] In the design of adsorption materials, according to the characteristics of fluoride ions, it is often necessary to consider increasing the porosity and reducing the particle size, preferably mesoporous, large specific surface area, more positive charges, itself or doping elements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/14
CPCB01J20/20C02F1/281C02F1/283C02F2101/14B01J2220/4825
Inventor 叶长青严玲周楠杨玉环周清稳
Owner NANTONG UNIVERSITY
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