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Composite photocatalyst and preparation method thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of low catalytic efficiency, complex synthesis process, high energy consumption, etc., and achieve the effects of high catalytic efficiency, simple process and low equipment requirements

Active Publication Date: 2017-06-06
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, photocatalytic materials are facing problems such as complex synthesis process, low catalytic efficiency and high energy consumption, which limit their industrial production and practical application.

Method used

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  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof

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preparation example Construction

[0022] A kind of preparation method of composite photocatalyst provided by the embodiment of the present invention comprises the following steps:

[0023] S1. Calcining urea to obtain CNNS to be treated.

[0024] Furthermore, the calcination process of urea is to place the urea on a semi-closed carrier, and then place it in a furnace protected by an inert gas for calcination at a temperature of 550-555°C, and the calcination time is 3.8-4 hours. The heating rate of the calcination process is 2-2.2° C. / min. It should be noted that, according to the high temperature requirements of the experiment process, during the calcination process, the carrier is preferably a crucible with a crucible cover, and the furnace used for calcination can be a commonly used tube furnace.

[0025] S2. Carrying out first washing and first drying sequentially on the CNNS to be processed obtained in step S1 to obtain CNNS.

[0026] It should be noted that the first washing process is specifically to ...

Embodiment 1

[0033] This embodiment provides a kind of preparation method of composite photocatalyst, and its preparation process is as follows:

[0034] Weigh 7.5 grams of urea, put it in a crucible, and put a crucible lid on the crucible to make it in a semi-closed state. Then, place it in a tube furnace as a whole for calcination at 550 ° C. The calcination time is 4 During the calcination process, argon gas was introduced for gas protection, and the heating rate during the calcination process was 2° C. / min.

[0035] After calcination, the obtained samples were washed once with absolute ethanol and three times with deionized water, and the washed samples were vacuum-dried at 60°C in a vacuum oven to obtain CNNS with a porous structure.

[0036] 0.32 g of Bi(NO 3 ) 3 ·5H 2 O and 0.08 g of KBr were dispersed in ethylene glycol to form a BiOBr precursor solution; 0.8 g of CNNS was dispersed in 80 mL of deionized water and sonicated for 30 minutes to form g-C 3 N 4 Nanosheet suspension...

Embodiment 2

[0040] This embodiment provides a kind of preparation method of composite photocatalyst, and its preparation process is as follows:

[0041] Weigh 7.5 grams of urea, put it in a crucible, and put a crucible lid on the crucible to make it in a semi-closed state. Then, place it in a tube furnace as a whole for calcination at 555 ° C. The calcination time is 3.8 During the calcination process, argon gas was introduced for gas protection, and the temperature rise rate during the calcination process was 2.2° C. / min.

[0042] After calcination, the obtained sample was washed once with absolute ethanol and three times with deionized water, and the washed sample was vacuum-dried at 62°C in a vacuum oven to obtain CNNS with a porous structure.

[0043] 0.32 g of Bi(NO 3 ) 3 ·5H 2 O and 0.08 g of KBr were dispersed in ethylene glycol to form a BiOBr precursor solution; 0.88 g of CNNS was dispersed in 80 mL of deionized water and sonicated for 30 minutes to form g-C 3 N 4 Nanosheet ...

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Abstract

The invention discloses a composite photocatalyst and a preparation method of the composite photocatalyst, and relates to the field of photocatalysis. The preparation method of the composite photocatalyst comprises the steps that urea is taken as a raw material and calcinated in an argon atmosphere; a porous graphite phase carbon nitride (g-C3N4) nanosheet is prepared by combining ultrasonication; a BiOBr nanosheet is uniformly dispersed on the surface of the g-C3N4 nanosheet (CNNS) by utilizing a simple backflow process based on an in-situ crystallization technique to construct a layered BiOBr nanosheet / g-C3N4 nanosheet composite photocatalysis material. The preparation method is simple in technology, low in synthesis temperature, low in equipment requirement and low in cost; the raw material is easy to obtain. Compared with a commercial P25 catalyst, the prepared composite photocatalyst presents very high photocatalytic degradation efficiency on rhodamine B (RhB), and has a good degradation effect on bisphenol A (BPA).

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst and a preparation method thereof. Background technique [0002] With the rapid development of my country's industry, the discharge of industrial wastewater has increased year by year, causing serious environmental pollution. At present, traditional organic pollutant treatment methods include physical methods, chemical methods and biochemical methods, etc., but they all have more or less defects and cannot meet the requirements of sustainable development. The main problems are low catalytic efficiency, high cost, secondary pollution etc. The application of photocatalytic technology in the field of environmental control has the advantages of high efficiency, greenness, economy, and effective use of solar energy. [0003] At present, photocatalytic materials are facing problems such as complex synthesis process, low catalytic efficiency and high en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2101/30B01J35/39Y02W10/37
Inventor 刘超季明伟房杰许凤华杨启航张春徐桂龙朱义松王晨徐启翔
Owner YANCHENG INST OF TECH
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