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Biochar-based composite material, and preparation method and application thereof

A composite material and biochar technology, applied in chemical instruments and methods, catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, etc., can solve the problem of low purification efficiency of polluted water and achieve high utilization value , no pollution to the environment and stable performance

Inactive Publication Date: 2019-09-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the problem of low purification efficiency of polluted water existing in the prior art, develop a functional ternary compound with strong adsorption and catalytic properties and high efficiency, which can be used to treat hexavalent chromium in wastewater Composite material; and a method for preparing photocatalytic pellets with easy operation; also provides a method for applying the above pellets to treating hexavalent chromium wastewater

Method used

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  • Biochar-based composite material, and preparation method and application thereof
  • Biochar-based composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation steps of biochar-based composites:

[0017] (1) Weigh 30g of melamine in a crucible, add distilled water to make it cover the medicine, let stand for stratification, pour off the supernatant liquid, add absolute ethanol to cover the medicine, leave it to stand, after it is layered, pour off the upper layer Clear liquid, put the crucible into the muffle furnace, without the lid, heat it at 70°C for 40min to completely volatilize the absolute ethanol, cover with the lid, calcine at 550°C for 3h, cool to room temperature and grind into powder , to obtain g-C 3 N 4 ;

[0018] (2) Rinse the picked kenaf branches and leaves with distilled water, put them in a dry and ventilated place for natural dehydration, and then put the dried kenaf leaves in an oven with a temperature of 70 ° C to dry to complete dehydration, and then put them into a pulverizer and grind them into Powder, the powder is screened and bagged for later use; the sieved kenaf powder is placed in...

Embodiment 2

[0021] The specific experimental steps for the treatment of hexavalent chromium in wastewater by biochar-based composites at different pH are as follows:

[0022] Take a certain amount of hexavalent chromium waste water, the mass concentration of hexavalent chromium in the waste water is 50mg / L, adjust the pH to 3 and 6 respectively, add a certain amount of the biochar-based composite material obtained in Example 1 into the waste water, The addition amount of biochar-based composite material in every 200mL of wastewater is 4g, firstly carry out lightless adsorption for 1h, then carry out photocatalytic reaction for 3h, take samples every 0.5h, and then measure the concentration of hexavalent chromium by spectrophotometry, that is, complete Removal of hexavalent chromium from wastewater. The removal rates of hexavalent chromium under the conditions of pH 3 and 6 are shown in Table 1:

[0023] Table 1 Removal rate of hexavalent chromium under two pH conditions

[0024] ...

Embodiment 3

[0027] The specific experimental steps for the treatment of hexavalent chromium in wastewater by biochar-based composite materials at different times are as follows:

[0028]Get a certain amount of hexavalent chromium wastewater, the mass concentration of hexavalent chromium in the wastewater is 50mg / L, adjust the pH to 3, add a certain amount of the biochar-based composite material obtained in Example 1 into the wastewater, every 200mL of wastewater The addition amount of the biochar-based composite material is 4g, firstly carry out 1h of no light adsorption, and then carry out the photocatalytic reaction for 3h, take samples every 0.5h, and then measure the concentration of hexavalent chromium by spectrophotometry. Removal of hexavalent chromium. The removal rates of hexavalent chromium at different times are shown in Table 2:

[0029] Table 2 Removal rate of hexavalent chromium at different times

[0030] time (h) Hexavalent chromium removal rate (%) (pH=3) ...

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Abstract

The invention relates to a biochar-based composite material for water treatment, and a preparation method and an application thereof. The biochar-based composite material is prepared by using chitosan as a carrier and uniformly loading kenaf biochar and g-C3N4. The preparation method comprises the following steps: dissolving chitosan, adding the kenaf biochar and g-C3N4 to obtain a mixed suspension, and dropwise adding the mixed suspension to a NaOH solution by using a syringe to obtain gel pellets having a uniform particle size. The biochar-based composite material has the advantages of simple preparation method, low cost, recyclability and high treatment efficiency. The material can be used for industrial wastewater treatment and repairing.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and new technologies for water treatment, and in particular relates to a biochar-based composite material and a preparation method and application thereof. Background technique [0002] With the development of science and technology and industry, people's production level and quality of life have been improved, but the destruction of the ecological environment, especially the excessive discharge of heavy metal-containing wastewater, has seriously threatened the survival and development of human beings. The toxicity of hexavalent chromium is 100 times higher than that of trivalent chromium. It has the characteristics of strong toxicity, strong oxidation, not easy to be metabolized and easy to be bioaccumulated. It usually exists in electroplating, metal surface treatment, electroless deposition, leather, etc. Wastewater from grinding, etching and other industries will seriously aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/00B01J35/08B01J37/08C02F1/30C02F101/22
CPCB01J31/06B01J37/084B01J37/082C02F1/30C02F2101/22C02F2305/10B01J35/51B01J35/39
Inventor 胡新将韩诗婷胡熙霍惠雯王慧许悦姬懿李闯袁雪婷
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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