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Biochar flocculating agent, and preparation method and application thereof

A flocculant and biochar technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve problems such as slow heavy metal speed and slow water body separation speed

Active Publication Date: 2019-04-02
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a biochar flocculant and its preparation method and application for the problems of slow removal of heavy metals in water and slow separation from water by biochar flocculants

Method used

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  • Biochar flocculating agent, and preparation method and application thereof
  • Biochar flocculating agent, and preparation method and application thereof
  • Biochar flocculating agent, and preparation method and application thereof

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preparation example Construction

[0024] A preparation method of biochar flocculant, comprising the following steps:

[0025] Vacuum impregnation of biomass material in CaCl 2 solution and Na 2 CO 3 In the solution, after drying, the biochar flocculant is prepared under the condition of high temperature and oxygen isolation. The biomass material is one or more of crop straw, pokeweed straw, bamboo fiber, and wood chips, among which pokeweed straw is used as raw material. Biochar flocculants have higher efficiency in removing heavy metals.

[0026] The main components of biomass such as crop straw, pokeweed straw, bamboo fiber and sawdust used in the invention are cellulose and lignin, and the cellulose and lignin are carbonized under high temperature and oxygen barrier conditions to prepare biochar. Vacuum impregnation of biomass material in CaCl 2 In solution, Ca 2+ Loaded on the surface of biomass, while diffusing into the interior of the biomass material. During the high temperature oxygen barrier pre...

Embodiment 1

[0037] (1) Pokeweed straw, impregnated in CaCl under vacuum 2 solution, CaCl 2 The solution concentration is 0.5mol / L, and the vacuum impregnation time is 12h;

[0038] (2) Vacuum impregnation of CaCl 2 The pokeweed straw after solution was impregnated in Na 2 CO 3 In solution, Na 2 CO 3 The solution concentration is 1mol / L, and the vacuum impregnation time is 12h;

[0039] (3) The dried pokeweed straw was prepared into a biochar flocculant at 400°C under the condition of oxygen isolation;

[0040] (4) 100mg / L biochar flocculant flocculation to remove 100mg / L Cd in water 2+ ;

[0041] (5) After 5min, Cd 2+ The removal rate was 100%.

Embodiment 2

[0043] (1) Corn stalks, impregnated in CaCl under vacuum 2 solution, CaCl 2 The solution concentration is 1mol / L, and the vacuum impregnation time is 24h;

[0044] (2) Vacuum impregnation of CaCl 2 The corn stalks after the solution were impregnated in Na 2 CO 3 In solution, Na 2 CO 3 The solution concentration is 2mol / L, and the vacuum impregnation time is 24h;

[0045] (3) The dried corn stalks were prepared into a biochar flocculant at 500°C under the condition of oxygen isolation;

[0046] (4) 300mg / L biochar flocculant flocculation to remove 100mg / L Cd in water 2+ , 100mg / L Cu 2+ , 200mg / LPb 2+ ;

[0047] (5) After 10min, Cd 2+ 100% removal rate, Pb 2+ 100% removal rate, Cu 2+ The removal rate was 100%.

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Abstract

The invention relates to a biochar flocculating agent, and a preparation method and application thereof. The preparation method of the biochar flocculating agent comprises the steps of: immersing a biomass material in a CaCl2 solution and a Na2CO3 solution under vacuum conditions in sequence, conducting drying, and preparing the biochar flocculating agent under high temperature and oxygen barrierconditions, wherein the biomass material is one or more of crop straw, Phytolacca acinosa stalks, bamboo fibers and wood chips. The preparation method of the above biochar flocculating agent is simplein preparation process and low in cost, and the formed biochar flocculating agent can rapidly flocculate and remove heavy metals in a water body.

Description

technical field [0001] The invention relates to the field of heavy metal polluted water treatment, in particular to a biochar flocculant. In particular, it also relates to a biochar flocculant and its preparation method and application. Background technique [0002] As a carbon-rich porous material, biochar has attracted more and more attention in the field of heavy metal-polluted water treatment due to its environmental friendliness, high specific surface area, high adsorption properties, and high porosity. The existing methods of using biochar to remove heavy metals from water rarely consider the practical problem of biochar separation from water after application. In particular, after biochar is ground into fine particles, it is obviously not conducive to the practical application of biochar water treatment agent to separate from the water body only by its own gravity. For example, the patent with the publication number CN 107362772A discloses a biochar preparation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/28C02F101/20
CPCC02F1/281C02F1/283C02F1/5236C02F2101/20C02F2101/206
Inventor 陈章冯涛刘涛陆景平徐雨菡何文龙
Owner HUNAN UNIV OF SCI & TECH
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