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Magnetic ZIF-8 coated Fe3O4/g-C3N4 composite catalyst, preparation method and application

A technology of ZIF-8 and composite catalysts, which is applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc. It can solve the problems of low utilization rate of sunlight and poor catalytic effect of visible light catalysts, etc. problems, to achieve wide spectral response range, excellent visible light catalytic effect, and high mobility

Active Publication Date: 2021-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the above technical problems, the invention provides a magnetic ZIF-8 coated Fe 3 o 4 / g -C 3 N 4 A method for preparing a novel composite catalyst, the method for preparing a composite visible light catalyst can solve the technical problems of the poor catalytic effect of the visible light catalyst prepared in the prior art and the low utilization rate of sunlight

Method used

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  • Magnetic ZIF-8 coated Fe3O4/g-C3N4 composite catalyst, preparation method and application
  • Magnetic ZIF-8 coated Fe3O4/g-C3N4 composite catalyst, preparation method and application
  • Magnetic ZIF-8 coated Fe3O4/g-C3N4 composite catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of ZIF-8 porous matrix

[0046] Weigh zinc nitrate and dimethylimidazole according to the mass ratio of 1:2, and disperse into methanol solution, ultrasonic treatment for 1 h, then stand for 12 h, filter, wash, and dry to obtain ZIF-8 porous matrix material.

[0047] (2) ZIF-8 surface modification

[0048] ZIF-8 obtained in step (1) and sodium lignosulfonate are ground and mixed in a mortar according to a mass ratio of 1:5, washed with ethanol, filtered, and dried to obtain surface-modified ZIF-8 to ensure that the later iron Ions and urea only enter the ZIF-8 pores, so they will not be adsorbed on its surface.

[0049] (3) Solution filling of ZIF-8

[0050] The modified ZIF-8 obtained in step (2) is immersed in the mixed solution of ferric nitrate and urea for 24h, during which the impregnation is re-dipped after filtering every 6 hours, wherein product (2): the mass ratio of ferric nitrate and urea is controlled at 1:1:5 range.

[0051] (4) ZIF-8 c...

Embodiment 2

[0057] (1) Preparation of ZIF-8 porous matrix

[0058] Weigh zinc nitrate and dimethylimidazole according to the mass ratio of 1:2, and disperse into methanol solution, ultrasonic treatment for 1 h, then stand for 10 h, filter, wash, and dry to obtain ZIF-8 porous matrix material.

[0059] (2) ZIF-8 surface modification

[0060] ZIF-8 obtained in step (1) and sodium lignosulfonate are ground and mixed in a mortar according to a mass ratio of 1:10, washed with ethanol, filtered, and dried to obtain surface-modified ZIF-8 to ensure that the later iron Ions and urea only enter the ZIF-8 pores, so they will not be adsorbed on its surface.

[0061] (3) Solution filling of ZIF-8

[0062] ZIF-8 after step (2) gained modification is immersed in the mixed solution of ferric nitrate and urea 48h, impregnates again after filtering every 6 hours during, wherein product (2): the mass ratio of ferric nitrate, urea is controlled at 1:1:10 range.

[0063] (4) ZIF-8 coated Fe 3 o 4 / g -C...

Embodiment 3

[0069] (1) Preparation of ZIF-8 porous matrix

[0070] Weigh zinc nitrate and dimethylimidazole according to the mass ratio of 1:2, and disperse into methanol solution, ultrasonic treatment for 1 h, then stand for 12 h, filter, wash, and dry to obtain ZIF-8 porous matrix material.

[0071] (2) ZIF-8 surface modification

[0072] ZIF-8 obtained in step (1) and sodium lignosulfonate are ground and mixed in a mortar according to a mass ratio of 1:10, washed with ethanol, filtered, and dried to obtain surface-modified ZIF-8 to ensure that the later iron Ions and urea only enter the ZIF-8 pores, so they will not be adsorbed on its surface.

[0073] (3) Solution filling of ZIF-8

[0074] The modified ZIF-8 obtained in step (2) is immersed in the mixed solution of ferric nitrate and urea for 24 hours, during which it is re-impregnated after filtering every 6 hours, wherein the mass ratio of product (2) ferric nitrate and urea is controlled at 1 :1:10 range.

[0075] (4) ZIF-8 coa...

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Abstract

The invention discloses a preparation method of a magnetic ZIF-8 coated Fe3O4 / g-C3N4 composite catalyst. The preparation method comprises the following steps: preparation of a ZIF-8 porous matrix, surface modification of ZIF-8, solution filling of ZIF-8, and preparation of the ZIF-8 coated Fe3O4 / g-C3N4 catalyst. The invention further discloses the composite catalyst, a carrier ZIF-8 is arranged in the composite catalyst, Fe3O4 is arranged in a ZIF-8 pore channel, and C3N4 is arranged on the outermost layer. The invention also discloses application of the composite catalyst as a photocatalyst in degradation of organic matters in acid-containing wastewater. The novel composite catalyst has the advantages of simple preparation process, no pollution and excellent visible light catalysis effect. The catalyst can effectively solve the technical problems that an existing visible-light-driven photocatalyst is poor in catalytic effect and low in sunlight utilization rate, and a preparation process is polluted, and can effectively degrade organic matters in acid-containing wastewater, and realizes qualification discharge of organic matters in the acid-containing wastewater.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and relates to a catalyst for the degradation of organic matter in wastewater, specifically a magnetic ZIF-8 coated Fe 3 o 4 / g -C 3 N 4 Preparation method of new composite catalyst. Background technique [0002] With the increasingly serious problem of eutrophication in water bodies and the increasingly stringent discharge standards of ammonia nitrogen and organic matter, advanced wastewater treatment technology has become a topic of widespread concern to scholars at home and abroad. Among them, the cold rolling units in the iron and steel industry are all involved in the pickling of strip steel. In order to realize the recycling of waste acid, acid regeneration units are designed and arranged. Most hydrochloric acid regeneration units are equipped with a silicon removal process, which will inevitably bring NH in the wastewater when the silicon removal device is running. 3 -N e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/30
CPCB01J27/24C02F1/30C02F2305/10C02F2101/40C02F2101/308B01J35/33B01J35/61
Inventor 高时庄卢勇侯红娟宋俊宋艳丽
Owner BAOSHAN IRON & STEEL CO LTD
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