BiVO4/MoS2-coated GO composite photocatalytic material as well as preparation method and application thereof

A composite photocatalysis, dosage ratio technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. , Green environmental protection treatment technology, the effect of high-efficiency treatment technology

Active Publication Date: 2022-04-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But BiVO 4 Its visible light response shows an absorption edge at 480nm, and its ability to absorb light of later wavelengths drops sharply, and its own photogenerated carriers are easy to recombine, which limits its application.

Method used

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  • BiVO4/MoS2-coated GO composite photocatalytic material as well as preparation method and application thereof
  • BiVO4/MoS2-coated GO composite photocatalytic material as well as preparation method and application thereof
  • BiVO4/MoS2-coated GO composite photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1)MoS 2 Preparation of:

[0044] Put 0.992g ammonium molybdate tetrahydrate and 1.824g thiourea into 100mL deionized water, stir for 30min until completely mixed; transfer to a 150mL autoclave, heat at 230°C for 22h; Wash with water and absolute ethanol several times, dry in a vacuum oven for 8 hours, and grind to collect powder samples.

[0045] Get 480mg powder sample, add in the mixed solution of 1200mL deionized water and ethanol (V 去离子水 :V 乙醇 =3:1), ultrasonically stirred for 8h, stood overnight, collected the precipitate, and dried it in a vacuum oven for 8h to obtain MoS 2 .

[0046] (2) Preparation of GO:

[0047] Put 100mL of concentrated sulfuric acid in a 1000mL beaker and place them together in an ice-water bath at 0°C, then add 2g of expandable graphite powder and 1g of analytically pure NaNO to it 3 , stirred for 30min. After stirring, slowly add 6g of analytically pure KMnO to the beaker several times in small amounts 4 , Stir for 2 hours to mix ...

Embodiment 2

[0057] In this example, the BiVO 4 / MoS 2 BiVO in @GO Composite Photocatalyst 4 、MoS2 The effect of different proportions of GO and GO on the catalytic performance of the composite catalyst.

[0058] Adopt the method described in embodiment 1 to prepare MoS 2 And GO, spare. Control MoS 2 And the addition amount of GO is constant, changes Bi(NO) in embodiment 1 step (3) 3 ·5H 2 The amount of O, PVP, ethylene glycol and 3-mercaptopropionic acid was used to adjust BiVO 4 in BiVO 4 / MoS 2 The proportion of @GO composite photocatalyst is 50-90%. The specific inspection steps are as follows:

[0059] Bi(NO) 3 ·5H 2 Dissolve O and PVP in ethylene glycol, mix well by ultrasonic, then add 3-mercaptopropionic acid, stir and mix well, then adjust the pH to get BiVO 4 ;

[0060] Then to BiVO 4 Add prepared GO and MoS 2 , stir and mix evenly, add 25mL ammonium metavanadate aqueous solution with a concentration of 4.624g / L, stir, then heat at 180°C for 1 hour, cool to room t...

Embodiment 3

[0066] In order to determine the stability of the material, the BiVO prepared in Example 1 4 / MoS 2 The @GO composite photocatalytic material has been subjected to a cycle experiment, and the experimental results are as follows: image 3 shown. After the tetracycline solution was degraded, the precipitate was collected by centrifugation, washed several times with water and ethanol, and dried in a vacuum oven for 8 hours. When the mass of the catalyst was less than 0.1 g, a new catalyst was added.

[0067] image 3 for BiVO 4 / MoS 2 Cyclic degradation diagram of @GO composite photocatalyst. It can be seen from the figure that the degradation rate of the catalyst is still 78.4% after four cycles, indicating that the prepared photocatalyst has good stability.

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Abstract

The invention provides a BiVO4 / MoS2-GO composite photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of photocatalyst preparation and environmental material preparation. According to the preparation method disclosed by the invention, MoS2, BiVO4 and GO are constructed into the BiVO4 / MoS2 (at) GO composite photocatalytic material by adopting a one-step in-situ hydrothermal growth method, so that the BiVO4 / MoS2 (at) GO composite photocatalytic material is obtained; the BiVO4 / MoS2 / GO composite photocatalytic material has very high photocatalytic performance and can be applied to photocatalytic degradation of tetracycline in a water body.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation and environmental material preparation, and specifically relates to a BiVO 4 / MoS 2 @GO composite photocatalytic materials and their preparation methods and applications. Background technique [0002] Recently, the scientific community has shifted the research focus from "traditional" pollutants (including pesticides, heavy metal ions and industrial wastewater, etc.) to "new pollutants", among which pharmaceuticals and personal care products (PPCPs) have been extensively studied. Antibiotics are an extremely important PPCPs, among which tetracycline (TC) is widely used, which produces a large number of residues in the environment, which is difficult to degrade by itself, causing great pollution to the environment. Therefore, it is of great practical significance to study appropriate treatment methods to deal with tetracycline residual pollutants in water bodies. [0003] Photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J23/22B01J37/10C02F1/30C02F101/38C02F101/34
Inventor 陈小龙刘馨琳曹广伟解荣俊
Owner JIANGSU UNIV
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