A kind of preparation method of composite photocatalyst

A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as no literature reports, and achieve the effect of easy drying and removal

Active Publication Date: 2017-03-29
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, current research on graphitic carbon nitride (g-C 3 N 4 ), hematite phase iron oxide (α-Fe 2 o 3 ) and magnetite phase iron oxide (γ-Fe 2 o 3 ) low-temperature (≤100°C) preparation of composite materials and the study of photocatalytic reduction of hexavalent chromium in water, there is no literature report

Method used

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  • A kind of preparation method of composite photocatalyst
  • A kind of preparation method of composite photocatalyst
  • A kind of preparation method of composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 5,000 mg of melamine into a crucible, cover the crucible, put it into an intelligent programmable muffle furnace, heat from room temperature to 550°C, set the heating rate to 4°C / min, and continue heating at 550°C for 3 hours, then Cool naturally to room temperature to obtain g-C 3 N 4 . Prepare a 5 wt % aqueous solution of hydrazine hydrate, then add 500 mg of g-C under magnetic stirring 3 N 4 After stirring for 10 minutes, 200 mg of ferric nitrate was added, and stirring was continued for 20 minutes; the mixture was put into an oven and heated at 100° C. for 15 hours to obtain the final product.

[0027] Adopt German Bruker-AXS company D8 ADVANCE polycrystalline X-ray diffractometer, analyze the phase of the product made, such as figure 1 shown. The result shows: the product made in embodiment 1 is g-C 3 N 4 , α-Fe 2 o 3 and γ-Fe 2 o 3 compound.

Embodiment 2

[0029] Weigh 5,000 mg of melamine into a crucible, cover the crucible, put it into an intelligent programmable muffle furnace, heat from room temperature to 550°C, set the heating rate to 4°C / min, and continue heating at 550°C for 3 hours, then Cool naturally to room temperature to obtain g-C 3 N 4 ; Prepare 5wt% aqueous solution of hydrazine hydrate, then add 500 mg of g-C under magnetic stirring 3 N 4 After stirring for 10 minutes, 300 mg of ferric nitrate was added, and stirring was continued for 20 minutes; the mixture was put into an oven and heated at 100° C. for 15 hours to obtain the final product.

[0030] Adopt German Bruker-AXS company D8 ADVANCE polycrystalline X-ray diffractometer, analyze the phase of the product made, such as figure 2 shown. The result shows: the product made by embodiment 2 is g-C 3 N 4 , α-Fe 2 o 3 and γ-Fe 2 o 3 compound.

Embodiment 3

[0032] Weigh 5,000 mg of melamine into a crucible, cover the crucible, put it into an intelligent programmable muffle furnace, heat from room temperature to 550°C, set the heating rate to 4°C / min, and continue heating at 550°C for 3 hours, then Cool naturally to room temperature to obtain g-C 3 N 4 ; prepare a 5 wt % aqueous solution of hydrazine hydrate, then add 500 mg of g-C under magnetic stirring 3 N 4 After stirring for 10 minutes, 400 mg of ferric nitrate was added, and stirring was continued for 20 minutes; the mixture was put into an oven and heated at 100° C. for 15 hours to obtain the final product.

[0033] Adopt German Bruker-AXS company D8 ADVANCE polycrystalline X-ray diffractometer, analyze the phase of the product made, such as image 3 shown. The result shows: the product made by embodiment 3 is g-C 3 N 4 , α-Fe 2 o 3 and γ-Fe 2 o 3 compound.

[0034] 2. Test the photocatalytic performance of the above composite materials:

[0035] The photocataly...

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Abstract

A method for preparing a composite photocatalyst, belonging to the technical field of new photocatalyst materials, comprising mixing an aqueous solution of hydrazine hydrate with graphite phase carbon nitride and ferric nitrate under magnetic stirring, and then heating the mixture at a low temperature to obtain g-C3N4 / α ‑Fe2O3 / γ‑Fe2O3 composites. The invention does not require inert gas protection, low synthesis temperature, relatively simple production equipment, process conditions and steps, and is easy to adjust the composition of composite products, and is suitable for industrial production. The composite photocatalyst material has the ability to efficiently treat hexavalent chromium wastewater .

Description

technical field [0001] The invention belongs to the technical field of novel photocatalyst materials, and in particular relates to a preparation method of a composite photocatalyst for treating hexavalent chromium wastewater. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) is a metal-free polymer semiconductor material with a bandgap of 2.7 eV. It has the characteristics of non-toxicity, good chemical and photochemical stability, easy preparation, abundant and cheap raw materials, and visible light catalytic activity for many chemical reactions. It is a visible light-responsive photocatalyst with industrial application prospect. However, g-C produced by conventional synthesis methods (such as thermal polymerization) 3 N 4 Due to the easy recombination of photogenerated electrons and holes, the photocatalytic activity is not high. [0003] Hematite phase iron oxide (α-Fe 2 o 3 ) is a cheap, non-toxic semiconductor material with a band gap of 2.2 eV, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F1/70C02F101/22
Inventor 张永才史骐玮蔡振宇张倩
Owner YANGZHOU UNIV
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