CdS/Ag/g-C3N4 heterojunction photocatalyst and preparation method thereof

A composite light and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low crystallinity, high exciton binding energy, photogenerated carrier mobility minor issues

Active Publication Date: 2017-06-23
东台市溱东科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

g-C 3 N 4 The energy gap position is unique, and it can complete the photocatalytic reaction that requires high semiconductor under visible light, but due to the g-C 3 N 4 High exciton binding energy and low crystallinity make it difficult to separate photogenerated electrons and holes, and the mobility of photogenerated carriers is small, resulting in low quantum efficiency in the photocatalytic process

Method used

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  • CdS/Ag/g-C3N4 heterojunction photocatalyst and preparation method thereof
  • CdS/Ag/g-C3N4 heterojunction photocatalyst and preparation method thereof
  • CdS/Ag/g-C3N4 heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) g-C 3 N 4 Preparation of nanosheets:

[0034] 5g of melamine was calcined, moved to a 550°C muffle furnace for calcination for 4 hours, and the heating rate was 2.5°C / min. After the calcination is finished, take out and grind; then the powder is calcined in the same procedure to obtain g-C 3 N 4 Nanosheets. Then add 1 g of g-C 3 N 4 The nanosheets are placed in a 90cm 3 Mechanically stir in a beaker of deionized water and 0.40g NaOH for 30min; then, transfer the solution to a 110°C reactor for 18h constant temperature thermal reaction; Dried to give g-C 3 N 4 Nanosheets.

[0035] (2) Ag / g-C 3 N 4 Preparation of:

[0036] 0.20g of g-C 3 N 4 nanosheets and 0.05g AgNO 3 Dissolve in 60ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature, wash the solid product with deionized water and ethanol, and dry to obtain Ag / g-C 3 N 4 ,spare;

[0037] ...

Embodiment 2

[0041] By the steps in Example 1, the difference is (2) the g-C of 0.20g 3 N 4 nanosheets and 0.01g AgNO 3 Dissolve in 60ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature, wash the solid product with deionized water and ethanol, and dry to obtain Ag / g-C 3 N 4 .

[0042] The sample in (2) was taken to carry out the photocatalytic degradation test in the photochemical reaction apparatus, and it was measured that the degradation rate of tetracycline by the photocatalyst reached 30.56% within 90 minutes.

Embodiment 3

[0044] By the steps in Example 1, the difference is (2) the g-C of 0.20g 3 N 4 nanosheets and 0.03g AgNO 3 Dissolve in 60ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature, wash the solid product with deionized water and ethanol, and dry to obtain Ag / g-C 3 N 4 .

[0045] The sample in (2) was taken to carry out the photocatalytic degradation test in the photochemical reaction apparatus, and it was measured that the degradation rate of tetracycline by the photocatalyst reached 50.41% within 90 minutes.

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Abstract

The invention provides a CdS / Ag / g-C3N4 heterojunction photocatalyst and a preparation method thereof. The preparation method comprises the following steps: 1. preparing g-C3N4 nanosheets; 2. preparing Ag / g-C3N4; and 3. preparing the CdS / Ag / g-C3N4 composite photocatalyst. The invention achieves the goal of degrading antibiotic wastewater by using CdS / Ag / g-C3N4 as the catalyst. By using the semiconductor material as the photocatalyst, the CdS / Ag / g-C3N4 photocatalyst interacts with the interface of the pollutant molecules to implement special catalytic or conversion effects under the excitation action of visible light, so that the surrounding oxygen and water molecules are excited to become free negative ions with high oxidizing power, thereby achieving the goal of degrading harmful organic substances in the environment. The method can not cause waste of resources or formation of additional pollution, is simple to operate, and is a green environment-friendly high-efficiency treatment technique.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and relates to the synthesis of CdS / Ag / g-C by photodecomposition deposition method and hydrothermal method 3 N 4 Preparation method and application of composite photocatalyst. Background technique [0002] Antibiotics mainly refer to some secondary metabolites or some artificially synthesized analogues produced by bacteria, molds or other microorganisms. It is mainly used to treat various bacterial infections or diseases caused by pathogenic microorganisms. It plays an extremely important role in human health and life safety. It is one of the great achievements of human beings in the field of medical science. In recent years, the residual situation of antibiotic substances in the water environment has become increasingly serious. Among them, antibiotic wastewater pollution represented by tetracycline is particularly significant, posing a serious threat to aquatic eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24B01J35/004C02F1/30C02F2101/38C02F2305/10Y02W10/37
Inventor 刘馨琳秦莹莹吕鹏王爽冯永强
Owner 东台市溱东科技发展有限公司
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