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Visible light photosensitization preparation method of TiO2-rGO compound light catalyst

A catalyst, composite light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve good social and economic benefits, high visible light photocatalytic performance, and simple operation.

Inactive Publication Date: 2013-04-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, no reducing agent is required to prepare rGO and TiO by the principle of dye photosensitization. 2 Research report on -rGO composite photocatalyst

Method used

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  • Visible light photosensitization preparation method of TiO2-rGO compound light catalyst
  • Visible light photosensitization preparation method of TiO2-rGO compound light catalyst
  • Visible light photosensitization preparation method of TiO2-rGO compound light catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0031] TiO 2 -rGO composite photocatalyst was prepared as follows: (1) 1 g of commercial P25 TiO 2 After heat treatment at 550°C for 2 h; (2) GO was ultrasonically dispersed and dissolved in deionized water to form a homogeneous solution, in which the concentration of GO was 0.05 wt%; (3) 2.5 mL of 10 mg / L rhodamine B solution was mixed with 10 mL of GO The solution is mixed evenly; (4) 1 g of heat-treated TiO 2 The nanoparticles were dispersed into the mixed solution of GO and rhodamine B obtained above, and stirred to form a uniform suspension; (5) the suspension prepared above was placed in N 2 Under protective gas, irradiate with visible light of 300 W xenon lamp for 60 min; (6) The obtained product was washed with deionized water for 3 times, and then dried at 60 °C for 6 h to obtain TiO 2 -rGO composite photocatalyst.

[0032] figure 1 Synthesis of TiO by Dye Photosensitization 2 Schematic diagram of the synthesis principle of the -rGO composite photocatalyst. Unde...

Embodiment 2

[0043] In order to test TiO 2 Effect of powder heat treatment temperature on TiO 2 - Influence of rGO composite photocatalyst, in addition to different heat treatment temperature, other reaction conditions such as: TiO 2 Powder heat treatment time (2 h), GO concentration (0.05 wt%), rhodamine B concentration (10 mg / L), light time (60 min), drying temperature (60 °C), drying time (6 h) were all related to Example 1 is the same. The results show that when the heat treatment temperature is 100 °C, TiO 2 The impurities adsorbed on the powder surface cannot be effectively removed, resulting in TiO 2 The powder and GO solution cannot form a homogeneous suspension, and the prepared TiO 2 The photocatalytic performance of -rGO composite photocatalyst is low (0.0065 min -1); when the heat treatment temperature is 350-600 ° C, TiO 2 Powder and GO solution can form a good uniform suspension, the prepared TiO 2 The photocatalytic performance of -rGO composite photocatalyst is 0.008...

Embodiment 3

[0045] In order to test TiO 2 Powder heat treatment time on TiO 2 - Influence of rGO composite photocatalyst, in addition to different heat treatment time, other reaction conditions such as: TiO 2 Powder heat treatment temperature (550°C), GO concentration (0.05 wt%), rhodamine B concentration (10 mg / L), light exposure time (60 min), drying temperature (60°C), drying time (6 h), etc. Example 1 is the same. The results show that when the heat treatment time is 0.5 h, TiO 2 The impurities adsorbed on the powder surface could not be effectively removed, resulting in TiO 2 The powder and the GO solution cannot form a homogeneous suspension, and the prepared TiO 2 The photocatalytic performance of the -rGO composite photocatalyst was not significantly improved (0.0067 min -1 ); when the heat treatment time is 1 and 3 h, TiO 2 Powder and GO solution can form a good uniform suspension, the prepared TiO 2 The photocatalytic performances of -rGO composite photocatalysts are 0.00...

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Abstract

The invention relates to a visible light photosensitization preparation method of TiO2-rGO compound light catalyst. The method comprises the following steps of: 1) thermally treating the commercial P25 TiO2 at high temperature; 2) ultrasonically dispersing an grapheme oxide in a de-ionized water to form an uniform solution; 3) mixing the Rhodamine B solution with the GO solution to form the uniform solution; 4) dispersing 1g of TiO2 nano particle in the uniform solution of the GO and Rhodamine B, and stirring uniformly; 5) irradiating the suspension liquid for 10-300 minutes in the presence of N2 by using the visible light, washing and drying the obtained product to obtain the TiO2-rGO compound light catalyst. The method provided by the invention has the advantages of environmental conservation and environmental friendliness without adding any organic additive as the reducing agent; meanwhile, the operation is simple, the device requirement is low, and the industrial production is easy to realize; and the prepared compound light catalyst has high photocatalysis, and the good social and economic benefit can be produced.

Description

technical field [0001] The present invention relates to the reduction of GO and TiO 2 - Visible light photosensitization preparation method of rGO composite photocatalyst. technical background [0002] At present, the world is facing severe challenges such as energy shortage, environmental degradation and climate warming. Photocatalysis has the functions of photolysis of water to produce hydrogen, photodegradation of organic pollutants and photoreduction of carbon dioxide. It has important application prospects in the fields of environmental protection, greenhouse gas treatment and so on. However, with TiO 2 The representative traditional photocatalytic materials have low quantum yield, and the photogenerated electrons and holes are easy to recombine, which greatly limits their application fields. Therefore, the current challenge is how to effectively suppress the rapid recombination of electron-hole pairs and promote the effective separation of photogenerated electrons a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J37/34
Inventor 余火根王苹王进明廷森余家国
Owner WUHAN UNIV OF TECH
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