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Hydrothermal preparation method of TiO2-rGO composite photochemical catalyst

A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effect of improving effective separation efficiency, low equipment requirements, and simple operation

Inactive Publication Date: 2015-02-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as we know, there is no information about the one-step preparation of TiO by hydrothermal method using pure water as solvent without any admixture as reducing agent. 2 Composite with reduced graphene (TiO 2 -rGO) as a highly active photocatalyst

Method used

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  • Hydrothermal preparation method of TiO2-rGO composite photochemical catalyst
  • Hydrothermal preparation method of TiO2-rGO composite photochemical catalyst
  • Hydrothermal preparation method of TiO2-rGO composite photochemical catalyst

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Experimental program
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Effect test

Embodiment 1

[0029] TiO 2 -rGO composite photocatalyst was prepared as follows: (1) 0.5 g commercial P25 TiO 2 After pretreatment at 550°C for 2 h; (2) dissolving graphene oxide in deionized water and ultrasonic treatment to form a uniform graphene oxide (GO) solution, in which the concentration of graphene oxide was 0.05 wt %; (3) adding 0.5 g pretreated TiO 2 Disperse into 10 ml graphene oxide solution and stir for 2 h to form stable TiO 2 -GO suspension; (4) TiO prepared above 2 -GO suspension was hydrothermally treated at 150°C for 5 h; the obtained product was washed three times and then dried in vacuum at 60°C for 6 h to obtain TiO 2 -rGO composite photocatalyst.

[0030] figure 1 is TiO 2 -Schematic diagram of the synthesis of rGO composites. As we all know, since graphene oxide contains many oxygen-containing functional groups, such as -OH, C=O, C-O-C and -COOH, it can be well dispersed in water to form a uniform and stable solution. figure 1 a is a schematic diagram of the s...

Embodiment 2

[0038] In order to test TiO 2 Effect of powder pretreatment temperature on TiO 2 - Influence of rGO nanocomposites, in addition to different pretreatment temperature, other reaction conditions are as follows: TiO 2 Powder pretreatment time (2 h), TiO 2 Powder mass (0.5 g), graphene oxide concentration (0.05 %) and volume (10 ml), stirring time (2 h), hydrothermal temperature (150 °C), hydrothermal time (5 h), drying temperature (60 °C ), drying time (6 h) etc. are all identical with embodiment 1. The results show that when the pretreatment temperature is 200 °C, TiO 2 The impurities adsorbed on the surface of the powder cannot be effectively removed, and the uniformity and suspension performance are not good after mixing with the graphene solution, which affects the TiO 2 Combination with graphene; when the pretreatment temperature is 350-600°C, TiO 2 The powder is mixed with the graphene solution to obtain a solution with good uniformity and suspension performance; when ...

Embodiment 3

[0040] In order to test TiO 2 Powder pretreatment time on TiO 2 - Influence of rGO nanocomposites, in addition to different pretreatment time, other reaction conditions are as follows: TiO 2 Powder pretreatment temperature (550°C), TiO 2 Powder mass (0.5 g), graphene oxide concentration (0.05 %) and volume (10 ml), stirring time (2 h), hydrothermal temperature (150 °C), hydrothermal time (5 h), drying temperature (60 °C ), drying time (6 h) etc. are all identical with embodiment 1. The results show that when the pretreatment time is 0.5 h, TiO 2 The impurities adsorbed on the powder surface were not effectively removed, which affected the formation of composite materials and the TiO 2 and graphene; when the pretreatment time is 1-3 h, TiO 2 The impurities adsorbed on the powder surface are effectively removed, forming a fresh interface, making TiO 2 It is easy to combine with the graphene surface; when the pretreatment time reaches 5 h, TiO 2 Too large powder particles ...

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Abstract

The invention relates to a hydrothermal preparation method of a TiO2-rGO composite photochemical catalyst, sequentially comprising the following steps of: dispersing pretreated TiO2 into 10mL of graphene oxide solution prepared by step 2), and evenly stirring, so as to obtain stable TiO2-GO suspending liquid; and carrying out hydrothermal treatment under the temperature of 100-200DEG C for 0.5-10 hours, washing a product by three times, and carrying out vacuum drying, so as to obtain the TiO2-rGO composite photochemical catalyst. The hydrothermal preparation method has the benefit effects of taking purified water as a solvent, being simple to operate, and free from adding various reducing agents such as an organic surface active agent and an additive, thereby being a green and environment-friendly graphene oxide reduction method. The photoproduction-electron hole effective separation efficiency can be improved due to the high electronic mobility of reduced graphene, so that the photocatalysed performance of the TiO2 can be improved, and the hydrothermal preparation method has the advantages of being very simple to operate, low in equipment requirement, free from expressive reaction devices, easy to synthesize on a large scale, etc.

Description

technical field [0001] The present invention relates to TiO 2 - Hydrothermal preparation method of rGO composite photocatalyst. technical background [0002] Due to the increasing global air and water pollution, the application of photocatalytic degradation of organic pollutants has attracted increasing attention. Titanium dioxide is one of the most widely studied photocatalysts with photocatalytic activity and can effectively degrade various organic compounds. However, titanium dioxide photocatalysts have not been widely used, mainly because titanium dioxide can generate photogenerated electron-hole pairs under ultraviolet light irradiation, and the recombination speed of photogenerated electron-hole pairs is faster than the chemical interaction between titanium dioxide and adsorbed pollutants. reduce the photocatalytic efficiency. Therefore, the current challenge is how to effectively prevent the recombination of electron-hole pairs and improve the TiO 2 photocatalytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18
Inventor 王苹王进余火根王雪飞
Owner WUHAN UNIV OF TECH
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