Composite visible light catalyst of g-C3N4/bismuth-based oxide and preparation method and application of composite visible light catalyst

A technology of g-c3n4 and oxides, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low photocatalytic activity of a single catalyst, achieve good photocatalytic activity, and simple process , the effect of easy operation

Active Publication Date: 2015-04-29
JIHE SMART URBAN TECH (GUANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is mainly based on Bi 2 o 3 Constructing g-C as a bismuth source 3 N 4 Heterostructure of bismuth-based oxides, aiming to improve the shortcoming of low photocatalytic activity of a single catalyst

Method used

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  • Composite visible light catalyst of g-C3N4/bismuth-based oxide and preparation method and application of composite visible light catalyst
  • Composite visible light catalyst of g-C3N4/bismuth-based oxide and preparation method and application of composite visible light catalyst
  • Composite visible light catalyst of g-C3N4/bismuth-based oxide and preparation method and application of composite visible light catalyst

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Experimental program
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Effect test

Embodiment 1

[0027] Bi 2 o 3 Powder preparation: 10 g Bi(NO 3 ) 3 ·5H 2 O dissolved in 30 ml HNO 3 In aqueous solution (1 mol / L), stir and dissolve at room temperature, then add NaOH solution (10 mol / L) dropwise until the pH of the solution is 11, transfer the yellow suspension into a water bath at 80 °C and stir for 1.5 h to deionize After washing with water until neutral, the yellow precipitate was dried at 80 °C and then calcined in a muffle furnace at 300 °C for 3 h to obtain Bi 2 o 3 Powder.

Embodiment 2

[0029] g-C 3 N 4 Preparation of photocatalysts. Weigh 5 g of melamine and place it in a semi-closed alumina crucible, move it into a muffle furnace and calcinate at 550 °C for 3 h with a heating rate of 3 °C / min, cool naturally to room temperature and grind to obtain g-C 3 N 4 Powder.

Embodiment 3

[0031] g-C 3 N 4 / Bi 2 o 2 CO 3 Preparation of composite photocatalysts. Take by weighing the Bi obtained in 5.0 g melamine and 1.3 g embodiment 1 2 o 3 Powder, mixed and placed in a semi-closed alumina crucible, moved into a muffle furnace and calcined at 550 °C for 2 h with a heating rate of 3 °C / min, cooled to room temperature and ground to obtain g-C 3 N 4 / Bi 2 o 2 CO 3 Composite photocatalyst, where g-C 3 N 4 The mass ratio in the composite catalyst is 60 wt%. XRD patterns of different photocatalysts ( figure 1 ) shows that Bi 2 o 3 Successfully converted to Bi 2 o 2 CO 3 . In addition, from the SEM images ( Figure 3a with Figure 3b ) can be seen in Bi 2 o 2 CO 3 from g-C 3 N 4 The body phase grows out, and the two are in close contact.

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Abstract

The invention discloses a composite visible light catalyst of a g-C3N4 / bismuth-based oxide and a preparation method and an application of the composite visible light catalyst. Carbon nitride in the composite light catalyst is graphite-phase carbon nitride; and the bismuth-based oxide is more than one of Bi2O2CO3, BiOBr, BiOCl, Bi2WO6, BiVO4 and BiOI. The components of the obtained composite catalyst are tight in contact, so that separation of photo electron-hole pairs is facilitated, and the photocatalytic efficiency is also improved; the composite catalyst has good degradation efficiency on organic pollutants represented by methyl orange under sunlight illumination; the preparation method disclosed by the invention has the characteristics of being simple in process, simple and convenient to operate, and cheap in raw materials; the prepared composite catalyst can be widely applied to waste water treatment, atmospheric purification and the like; and a new concept is provided for design of the novel composite visible light catalyst by the preparation method.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a g-C 3 N 4 Bismuth-based oxide composite visible light catalyst and its preparation method and application. Background technique [0002] Treating organic or inorganic pollutants in the environment with semiconductor photocatalysis technology is a promising environmental remediation technology. The success of this technology is largely dependent on the development of semiconductor photocatalysts that respond to visible light. At present, the non-metallic semiconductor g-C of graphitic phase 3 N 4 It has attracted extensive attention due to its superior visible light responsiveness. g-C 3 N 4 The bandgap width is about 2.7 eV, and it is mainly prepared by simple thermal polycondensation reaction of some cheap and easy-to-obtain precursors (such as urea, melamine, etc.). However pure g-C 3 N 4 Due to its low quantum yield, it exhibits low photocatalytic ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCY02W10/37
Inventor 胡芸单文杰韦朝海
Owner JIHE SMART URBAN TECH (GUANGZHOU) CO LTD
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