Ternary modified biochar for removing fluorine in water and preparation method of ternary modified biochar

A biochar modification technology, which is applied to water pollutants, chemical instruments and methods, and other chemical processes, can solve the problems that cannot fully meet the application requirements, and the fluoride removal efficiency of lanthanum-aluminum modified biochar is not ideal. , to achieve the effects of broadening the scope of application, improving the performance of fluoride removal, and increasing the anion exchange capacity

Active 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. The fluoride removal efficiency of the modified biochar loaded with lanthanum and aluminum is still not ideal. Moreover, due to the low isoelectric point and anion exchange capacity, the applicable pH range of this material is in acidic water bodies, and its use is still limited, which cannot fully meet the needs of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The rice straw is subjected to high-temperature carbonization treatment to obtain rice straw biochar.

[0022] (2) Dissolve 2.16g of lanthanum nitrate, 1.62g of ferric chloride and 2g of aluminum chloride in 100mL of deionized water to prepare a ternary modifier mixture, then add 1g of rice straw biochar and stir to obtain biochar - A mixed stock solution of modifiers.

[0023] (3) Use a peristaltic pump to drop a sodium hydroxide solution with a concentration of 3 mol / L to the obtained mixed stock solution containing biochar-modifier at a speed of 0.2 mL / min until the pH is 7.5, and continue stirring for 12 hours to obtain Modified product liquid.

[0024] (4) The obtained modified product liquid is subjected to centrifugation, and the precipitate obtained by the centrifugation is washed and then dried at a temperature of 105° C. to obtain a three-component modified biochar of rice straw.

[0025] (5) Fluorine adsorption experiment was carried out on the obtained...

Embodiment 2

[0028] (1) The rice straw is subjected to high-temperature carbonization treatment to obtain rice straw biochar.

[0029] (2) Dissolve 4.33g of lanthanum nitrate, 3.24g of ferric chloride and 4g of aluminum chloride in 100mL of deionized water to prepare a ternary modifier mixture, then add 1g of rice straw biochar for stirring to obtain biochar - A mixed stock solution of modifiers.

[0030] (3) Use a peristaltic pump to drop a sodium hydroxide solution with a concentration of 4mol / L to the obtained mixed stock solution containing biochar-modifier at a speed of 0.05mL / min until the pH is 7.5, and continue stirring for 12h to obtain Modified product liquid.

[0031] (4) Centrifuge the obtained modified product liquid, wash the precipitate obtained by the centrifugal separation, and then dry it at a temperature of 100° C. to obtain a three-component modified biochar of rice straw.

[0032] (5) Fluorine adsorption experiment was carried out on the obtained three-component modi...

Embodiment 3

[0035] (1) The rice straw is subjected to high-temperature carbonization treatment to obtain rice straw biochar.

[0036] (2) Dissolve 8.66g of lanthanum nitrate, 6.49g of ferric chloride and 8g of aluminum chloride in 100mL of deionized water to prepare a ternary modifier mixture, then add 1g of rice straw biochar for stirring to obtain biochar - A mixed stock solution of modifiers.

[0037] (3) Use a peristaltic pump to drop a sodium hydroxide solution with a concentration of 2 mol / L to the obtained mixed stock solution containing biochar-modifier at a speed of 0.5 mL / min until the pH is 7.5, and continue stirring for 12 hours to obtain Modified product liquid.

[0038] (4) Centrifuge the obtained modified product liquid, wash the precipitate obtained by the centrifugal separation, and then dry it at a temperature of 110° C. to obtain a three-component modified biochar of rice straw.

[0039] (5) Fluorine adsorption experiment was carried out on the obtained three-componen...

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PUM

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Abstract

The invention relates to the technical field of wastewater treatment. The invention discloses ternary modified biochar for removing fluorine in water and a preparation method of the ternary modified biochar. The preparation method comprises the following steps of adding biochar into a ternary modifier mixed solution containing lanthanum, iron and aluminum elements, then slowly adding alkali to reinforce and modify the biochar such that an aluminum form and an iron form with high charge and high polymerization degree and a polymetallic layered dihydroxide colloid are formed on a surface of thebiochar, therefore, the acid-base stability, the surface hydroxyl group, the anion exchange capacity and the isoelectric point of the modified biochar are improved, so that the fluorine removal performance of the modified biochar is improved, besides, the application range of the modified biochar can be widened to be alkaline, and the pH application range of the modified biochar reaches 4-10. Andwhen fluorine is adsorbed, the fluorine removal rate can be higher than 90%.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a ternary modified biochar 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 have fluorine-f...

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 叶长青周楠严玲周清稳杨玉环
Owner NANTONG UNIVERSITY
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