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Composite photocatalyst, preparation method thereof, and application of catalyst in degradation of organic dye

A technology of organic dyes and catalysts is applied in the field of materials to achieve the effects of high photocatalytic activity and simple preparation method

Active Publication Date: 2019-05-03
HUBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in BiVO 4 / Bi 4 V 2 o 11 Further doping or deposition is rarely reported

Method used

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  • Composite photocatalyst, preparation method thereof, and application of catalyst in degradation of organic dye
  • Composite photocatalyst, preparation method thereof, and application of catalyst in degradation of organic dye
  • Composite photocatalyst, preparation method thereof, and application of catalyst in degradation of organic dye

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of composite photocatalyst of the present embodiment, described composite photocatalyst is made of Ag and BiVO 4 / Bi 4 V 2 o 11 Composite material composition, wherein the mass fraction of Ag is 43.2%, that is, Ag and BiVO 4 / Bi 4 V 2 o 11 The mass ratio of the composite material is 0.76.

[0032] A kind of preparation method of composite photocatalyst of the present embodiment, comprises the following steps:

[0033] (1) BiVO 4 / Bi 4 V 2 o 11 Preparation of composite materials

[0034] Weigh 0.485g Bi(NO 3 ) 3 ·5H 2 O dissolved in 8mL H 2 O and 2 mL HNO 3 In a 25mL beaker, a transparent solution A was obtained after stirring for 30 minutes;

[0035] Add 0.117g NH 4 VO 3 Dissolve 0.1g EDTA in 10mL NaOH solution with a concentration of 4mol / L, and obtain B solution after ultrasonication for 30min;

[0036] Add solution B to solution A dropwise, stir for 10 minutes, and then use 2mol / L NaOH solution and 2mol / L HNO 3 Adjust the pH of the mixed ...

Embodiment 2

[0040] In order to verify the composite photocatalyst prepared in Example 1, the obtained Ag / BiVO 4 / Bi 4 V 2 o 11 The composite photocatalyst was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The test results are shown in figure 1 and figure 2 , figure 1 The two curves in the BiVO 4 / Bi 4 V 2 o 11 Composites and Ag / BiVO 4 / Bi 4 V 2 o 11 The XRD pattern of the composite photocatalyst, figure 2 and image 3 BiVO 4 / Bi 4 V 2 o 11 and Ag / BiVO 4 / Bi 4 V 2 o 11 SEM image of the composite photocatalyst.

[0041] Depend on figure 1 It can be seen that BiVO 4 / Bi 4 V 2 o 11 The characteristic diffraction peaks also contain monoclinic BiVO 4 (JCPDS 75-1866) and Bi in the orthorhombic phase 4 V 2 o 11 (JCPDS 42-0135). in BiVO 4 / Bi 4 V 2 o 11 After the introduction of metal Ag, the Ag / BiVO 4 / Bi 4 V 2 o 11 The characteristic diffraction peaks are basically the same as those of BiVO 4 / Bi 4 V 2 o 11 Consistent, no...

Embodiment 3

[0047] In order to verify the Ag / BiVO 4 / Bi 4 V 2 o 11 The photocatalytic activity of the composite photocatalyst was tested with rhodamine B (RhB) as a model pollutant. At present, commercial P25 is often used for photocatalytic degradation of RhB, so P25 is used as a reference, and the Ag / BiVO 4 / Bi 4 V 2 o 11 Composite Photocatalysts for Activity Evaluation, Simultaneously Studying Ag and BiVO 4 / Bi 4 V 2 o 11 Effects of different mass ratios on the catalytic activity of composite photocatalysts.

[0048] The RhB solution that 50mL concentration is 5mg / L is slowly poured into the AgNO prepared in Example 1 3 / BiVO 4 / Bi 4 V 2 o 11 In the beaker of the precursor, obtain the reaction mixture. In order for the adsorption-desorption to reach equilibrium, the reaction mixture was magnetically stirred for 30 min in the dark before turning on the light. Use a 300W xenon lamp (CEL-HXF300 from Zhongjiao Jinyuan) to simulate a visible light source, and illuminate for...

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Abstract

The invention discloses a composite photocatalyst, a preparation method thereof, and an application of the catalyst in the degradation of an organic dye. A BiVO4 / Bi4V2O11 composite material is synthesized by a simple and stable hydrothermal process, and in-situ photoreduction of AgNO3 is carried out in the photocatalytic degradation process of a dye rhodamine B to obtain the Ag / BiVO4 / Bi4V2O11 composite photocatalyst to enhance the photocatalytic degradation activity. The crystal shape, the morphology and the specific surface area of the composite photocatalyst are studied by XRD, SEM and BETrespectively, and capture experiments prove the active species playing a role in degradation in the photocatalytic degradation process, so a strong proof basis is provided for the degradation of theRhB. The Ag / BiVO4 / Bi4V2O11 composite photocatalyst of the invention has a simple preparation method and a high photocatalytic activity, and opens up a new way for the catalytic degradation of organicdyes.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a composite photocatalyst, a preparation method thereof and an application of the catalyst in degrading organic dyes. Background technique [0002] Due to the increase in population and the demand for the development of the chemical industry, the problem of environmental pollution is becoming more and more serious day by day. Therefore, the problem of environmental pollution has been closely concerned by all walks of life at home and abroad, and the research on how to reduce environmental pollution is also imminent. After years of research and exploration, as well as the advantages of solar energy as a renewable resource, the technology of visible light catalytic degradation of pollutants has emerged as the times require. This technology has the advantages of convenient operation, no re-pollution, and complete degradation. As a result, photocatalysis has set off a research boo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/10C02F1/30C02F1/72C02F101/34C02F101/36C02F101/38
Inventor 吕宝兰梁梦君章福清杨水金
Owner HUBEI NORMAL UNIV
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