Preparation method for composite photocatalyst

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

Active Publication Date: 2015-09-09
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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  • Preparation method for composite photocatalyst
  • Preparation method for composite photocatalyst
  • Preparation method for 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 w % 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 5w% 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 w % 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 above 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 photoc...

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Abstract

Belonging to the technical field of novel photocatalyst materials, the invention relates to a preparation method for a composite photocatalyst. The method includes: under magnetic stirring, mixing a hydrazine hydrate aqueous solution with graphite phase carbon nitride and ferric nitrate, and then heating the mixture at low temperature, thus obtaining the g-C3N4 / alpha-Fe2O3 / gamma-Fe2O3 composite material. The method provided by the invention has the advantages of no need of inert gas protection, low synthesis temperature, relatively simple production equipment, process conditions and steps, and easy adjustment of the composite product composition, and is suitable for industrial production. The prepared composite photocatalyst material has the ability of efficient treatment of 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 Applications(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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