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Method for preparing BiFeO3/g-C3N4 heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc.

Inactive Publication Date: 2018-04-20
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To the best of our knowledge, no BiFeO has been synthesized and applied 3 / g -C 3 N 4 Inventions Related to Heterojunction Photocatalysts

Method used

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  • Method for preparing BiFeO3/g-C3N4 heterojunction photocatalyst
  • Method for preparing BiFeO3/g-C3N4 heterojunction photocatalyst
  • Method for preparing BiFeO3/g-C3N4 heterojunction photocatalyst

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example

[0012] (1) Weigh 3 g of melamine powder into an alumina crucible and cover it, heat it to 550° C. in a muffle furnace, and keep it at this temperature for 4 hours. After natural cooling, the pale yellow powder was collected and ground for use.

[0013] (2) Weigh 4.850g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and 2.704g ferric chloride (FeCl 3 ·6H 2 O) Dissolve in 100 mL of acetone solution and sonicate for 30 minutes.

[0014] (3) Add 300mL deionized water and continue to stir, then add concentrated ammonia water to make the pH value about 11. The precipitate was collected and washed several times by centrifugation with deionized water until the pH value was neutral.

[0015] (4) Disperse the precipitate in deionized water, add 15 g of NaOH solution and continue stirring for 30 minutes. The prepared solution was poured into a 100mL Teflon-lined stainless steel high-temperature reaction kettle, heated to 180°C and kept for 72 hours.

[0016] (5) After natural...

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Abstract

The invention specifically discloses a method for rapidly preparing a BiFeO3 / g-C3N4 heterojunction photocatalyst. The catalyst has excellent catalytic performance under visible light, and can be applied to the field of environmental treatment such as sewage treatment and the like. According to the method, preparation is carried out by adopting a two-step method, and the two-step method comprises that firstly, g-C3N4 powder is obtained by adopting a method of calcining melamine at a high temperature, and BiFeO3 powder is prepared by adopting a high-temperature hydrothermal method; and then, theBiFeO3 / g-C3N4 heterojunction photocatalyst is prepared by using a wet chemical method. When an organic dye methyl orange (MO) solution is degraded under the irradiation of visible light, the catalystshows relatively good photocatalytic activity. The method provided by the invention has the advantages of low preparation cost, simple process, excellent catalytic performance and the like.

Description

technical field [0001] The present invention is specifically a kind of preparation BiFeO 3 / g -C 3 N 4 The method of the heterojunction photocatalyst belongs to the photocatalyst process technology and can be used in the field of environmental treatment such as sewage treatment. Background technique [0002] Various semiconductor catalysts studied in the early stage can only degrade organic pollutants under ultraviolet (UV) irradiation due to their wide band gap values ​​(>3eV), such as metal oxides (ZnO, TiO 2 ) and metal sulfides (ZnS). The larger forbidden band width limits the light-absorbing region of photocatalysts, and the energy of ultraviolet light only accounts for about 5% of the energy of the entire solar spectrum. Therefore, expanding the light absorption range of the catalyst, performing effective bandgap regulation, and combining two semiconductors with narrow bandgap widths to prepare composite catalysts have aroused people's interest. [0003] Graphi...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C02F1/30
CPCC02F1/30B01J23/002B01J27/24C02F2101/308C02F2305/10B01J35/39B01J35/00B01J35/30
Inventor 王兴福杜泽方毛巍威张健楚亮李兴鳌
Owner NANJING UNIV OF POSTS & TELECOMM
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