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CQDs/Bi2WO6 composite photocatalyst and preparation method thereof

A technology of catalyst and recombination of light, which is applied in the field of photocatalytic materials, can solve the problems of limited sunlight absorption range, limited practical application, and high recombination probability of photogenerated carriers, achieving good absorption, strong controllability, and high carrier The effect of separation efficiency

Inactive Publication Date: 2016-08-10
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Bi2WO6 can only utilize visible light below 450nm, which has a limited absorption range for sunlight, and the recombination probability of photogenerated carriers in Bi2WO6 is high, which limits its practical application.

Method used

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  • CQDs/Bi2WO6 composite photocatalyst and preparation method thereof
  • CQDs/Bi2WO6 composite photocatalyst and preparation method thereof
  • CQDs/Bi2WO6 composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A CQDs / Bi 2 WO 6 Composite photocatalyst consisting of nano-sized sheet-like Bi 2 WO 6 and nanoparticles of CQDs, and the CQDs nanoparticles are distributed in nanometer-sized sheet-like Bi 2 WO 6 Above, calculated by mass percentage, CQDs of nanoparticles: nanometer-sized sheet-like Bi 2 WO 6 3%: 97%.

[0029] The above CQDs / Bi 2 WO 6 Composite photocatalyst preparation method specifically comprises the following steps:

[0030] 1) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 2 mL of nitric acid to obtain Bi(NO 3 ) 3 solution; the Na 2 WO 4 2H 2 O was dissolved in deionized water to obtain Na at a concentration of 0.5 mol / L 2 WO 4 Aqueous solution; then calculated by molar ratio, namely Bi(NO 3 ) 3 Bi in solution 3+ : Na 2 WO 4 WO in aqueous solution 4 2- For a ratio of 2:1, the Bi(NO 3 ) 3 solution and Na 2 WO 4 The aqueous solution was mixed uniformly to obtain a white suspension;

[0031] 2) Add the CQDs aqueous solution to the white suspension...

Embodiment 2

[0041] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 WO 6 The mass ratio is 1%: 99%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 WO 6 The degradation rate of the composite photocatalytic material to the rhodamine B under the same conditions as the composite material obtained in Example 1 was 70%, which was lower than that of the composite material obtained in Example 1.

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 WO 6 The mass ratio is 5%: 95%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 WO 6 The degradation rate of the composite photocatalytic material to rhodamine B under the same conditions as the composite material obtained in Example 1 was 94.8%, which was lower than that of the composite material obtained in Example 1.

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Abstract

The invention relates to a carbon quantum dots (CQDs) / Bi2WO6 composite photocatalyst and a preparation method thereof. The CQDs / Bi2WO6 composite photocatalyst is composed of nano-scale Bi2WO6 sheets and nano CQDs particles which are distributed on the nano-scale Bi2WO6 sheets. The preparation method includes the steps of mixing water solutions of Bi(NO3)3.5H2O and Na2WO4.2H2O to prepare a white suspension liquid; adding a CQDs water solution to the white suspension liquid and moving the mixed solution to a hydrothermal kettle to obtain a reaction kettle; washing a reaction product successively with anhydrous alcohol and deionized water; and drying the reaction product at 60-80 DEG C for 12 h to prepare the CQDs / Bi2WO6 composite photocatalyst. The composite photocatalyst has wide spectral response range, high charge carrier separation efficiency and high photocatalytic activity, is simple in preparation method and has strong controllability.

Description

[technical field] [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a carbon quantum dot (CQDs) / Bi 2 WO 6 Composite photocatalyst and preparation method thereof. [Background technique] [0002] With the rapid progress of society and the rapid development of industry, it has also brought serious environmental problems to our country. Photocatalytic oxidation technology is an emerging environmental pollution control technology. It has the advantages of directly using sunlight to completely mineralize organic pollutants, no secondary pollution, low cost, and low energy consumption. Therefore, it has a very broad application prospect. In order to expand the practical application of photocatalytic technology, the core lies in the development of photocatalytic materials with wide spectral response range, high photocatalytic efficiency and strong practicability. As one of the simple Aurivillius oxides, Bi2WO6 has attracted much att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30C02F101/38
CPCC02F1/30B01J23/31C02F2101/38C02F2305/10B01J35/39
Inventor 张志洁郑婷婷徐明敏甘传先高颖余芷欣
Owner SHANGHAI INST OF TECH