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ZnS/Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane, preparation method and application

A technology of photocatalytic film and molecular imprinting, applied in chemical instruments and methods, physical/chemical process catalysts, water/sludge/sewage treatment, etc., can solve the problems of non-selectivity and difficult target removal, etc. Simple and convenient treatment, simple steps, and the effect of improving photocatalytic efficiency

Active Publication Date: 2017-07-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People improve the photocatalytic performance by modifying the photocatalyst, but it is still not selective, and it is difficult to remove the target substance in complex water bodies where multiple pollutants coexist.

Method used

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  • ZnS/Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane, preparation method and application
  • ZnS/Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane, preparation method and application
  • ZnS/Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) ZnS / Bi 2 o 3 Preparation of heterojunction catalysts

[0033] First, dissolve 9.7g of bismuth nitrate pentahydrate in 100mL of deionized water to obtain a bismuth nitrate solution, and then take 500mL of 0.5mol·L -1 Add sodium hydroxide solution dropwise to bismuth nitrate solution, stir, and react at room temperature to obtain white or light yellow precipitate. Centrifuged, then washed three times with deionized water and absolute ethanol, dried at 60°C for 12 hours after centrifugal separation, put the above powder in a muffle furnace and calcined at 400°C for 2 hours to obtain Bi 2 o 3 Catalyst, for use. Dissolve 2.2g of zinc acetate dihydrate and 3.8g of thiourea in 70mL of deionized water, then take 0.2g of Bi 2 o 3 The photocatalyst was dispersed in the above solution. After standing still for 0.5h, the above solution was transferred to a stainless steel autoclave, heated at 170°C for 5h, and after cooling to room temperature, it was vacuum filtered with...

Embodiment 2

[0041] Under the condition that other conditions remain unchanged, the comparative experiment is established as follows: (1) Bi 2 o 3 For photocatalysts, the calcination temperature is 300°C, the calcination time is 4h, and ZnS / Bi is synthesized by hydrothermal method 2 o 3 For heterojunction photocatalysts, the reaction temperature of the reactor is 210°C, and the reaction time is 5 hours. After the reaction, wash and dry in the same way, and grind to obtain a powder catalyst for use. (2) Bi 2 o 3 For photocatalysts, the calcination temperature is 500°C, the calcination time is 6h, and ZnS / Bi is synthesized by hydrothermal method 2 o 3 For heterojunction photocatalysts, the reaction temperature of the reactor is 170°C, and the reaction time is 24 hours. After the reaction, wash and dry in the same way, and grind to obtain a powder catalyst for use. The obtained catalysts prepared under different conditions were used to degrade rhodamine B, and the degradation efficiency...

Embodiment 3

[0043] (1) By changing ZnS / Bi 2 o 3 The amount of heterojunction photocatalyst (0.2g, 0.3g, 0.4g) was used to examine the effect of catalyst dosage on photocatalytic degradation. 2 o 3 While changing the amount of heterojunction photocatalyst, change the amount of dimethyl sulfoxide (16.94g, 16.84g, 16.74g) to ensure that ZnS / Bi 2 o 3 The total mass fraction of the heterojunction photocatalyst and dimethyl sulfoxide is 85.7%. The results show that when the catalyst dosage is 0.4g, the degradation efficiency of rhodamine B is the highest, which can reach more than 90%. Therefore, the amount of catalyst selected in the experiment was 0.4 g.

[0044] (2) Molecularly imprinted catalytic membranes prepared with 0.4 g of photocatalysts were catalytically degraded under visible light at different concentrations (10, 20, 30, 40, 50 mg·L -1 ) Rhodamine B solution, the degradation kinetics of Rhodamine B by molecularly imprinted photocatalyst membranes at different concentrations w...

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Abstract

The invention provides a ZnS / Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane, a preparation method and an application. The preparation method comprises the following steps: (1) preparing a Bi2O3 photocatalyst; (2) preparing a ZnS / Bi2O3 heterojunction photocatalyst; and (3) preparing a ZnS / Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane. The prepared ZnS / Bi2O3 heterojunction molecularly-imprinted photocatalytic membrane for selectively degrading rhodamine B has the advantages that in the process of photocatalytic degradation, the purposes of selective recognition, absorption and catalytic degradation of target pollutants can be effectively realized, the aftertreatment is simple and convenient, the efficiency of effective degradation of target substances is improved, and the selective treatment of dye waste water is stronger.

Description

technical field [0001] The invention relates to a method for preparing a molecularly imprinted catalytic film with a heterojunction structure semiconductor and photocatalysis by using phase inversion technology, specifically a ZnS / Bi that can efficiently degrade rhodamine B 2 o 3 The preparation method and application of the heterojunction molecularly imprinted photocatalytic membrane belong to the technical field of material preparation and environmental pollution control. Background technique [0002] Rhodamine B is a synthetic basic fluorescent dye, and it is also a common analytical reagent, widely used in environmental protection, mining, steel, medicine and other fields, and can also be used as a fluorescent stain for cells in laboratories. It was once used as a food additive, but experiments have proved that rhodamine B can cause cancer, and it is now not allowed to be used as a food additive and food dye. Since these compounds are excreted into the water environmen...

Claims

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Application Information

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IPC IPC(8): B01J27/04C02F1/30C02F101/38C02F101/36C02F101/34
CPCC02F1/30B01J27/04C02F2305/10C02F2101/38C02F2101/40C02F2101/34C02F2101/36C02F2101/308B01J35/39B01J35/59
Inventor 李彬榕孟敏佳储金宇崔颜华
Owner JIANGSU UNIV
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