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Preparation method of visible-light response high-activity TiO2 composite photocatalyst

A catalyst and visible light technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as low quantum efficiency and achieve the effect of performance enhancement

Inactive Publication Date: 2018-12-21
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In summary, the problems in the prior art are: the existing TiO 2 Composite photocatalysts can only be excited by ultraviolet light, which has disadvantages such as low quantum efficiency

Method used

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  • Preparation method of visible-light response high-activity TiO2 composite photocatalyst
  • Preparation method of visible-light response high-activity TiO2 composite photocatalyst
  • Preparation method of visible-light response high-activity TiO2 composite photocatalyst

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preparation example Construction

[0022] Such as figure 1 As shown, the visible light response high activity TiO provided by the embodiment of the present invention 2 The preparation method of composite photocatalyst comprises the following steps:

[0023] S101: Synthesis of H by stepwise acidification 6 P2 W 18 o 62 13H 2 O. 90-120mmol of Na 2 WO 4 2H 2 O and a certain proportion of concentrated H 3 PO 4 (n(H 3 PO 4 ) / n(Na 2 WO 4 2H 2 (0)=3-6) Add 100mL of deionized boiling water in turn, place in a 250mL three-neck flask, carry out reflux reaction for 8h, then cool to room temperature, then add 30g of solid KCl for precipitation, and vacuum dry the precipitate at 50°C after filtration Overnight, redissolve in 30mL of water, and slowly add 15mL of concentrated hydrochloric acid. Then use 30mL ether to extract the free heteropolyacid twice. Then decompose the separated oily ether compound in a hot water bath and dry it under vacuum at 50°C to obtain a yellow powder H 6 P 2 W 18 o 62 13H 2...

Embodiment 1

[0030] (1) 30g Na 2 WO 4 2H 2 O, 45 mL concentrated H 3 PO 4 Add 100mL of deionized boiling water in turn, place in a 250mL flask, carry out reflux reaction for 8h, then cool to room temperature, then add 30g of solid KCl for precipitation, the precipitate is filtered and vacuum-dried at 50°C overnight, then dissolved in 30mL of water, Slowly add 15mL of concentrated hydrochloric acid. Then use 30mL ether to extract the free heteropolyacid twice. Then decompose the separated oily ether compound in a hot water bath and dry it under vacuum at 50°C to obtain a yellow powder H 6 P 2 W 18 o 62 13H 2 O.

[0031] (2) Add 1mmol of H 6 P 2 W 18 o 62 13H 2 O was dissolved in a mixed solution of 5 mL of water and 20 mL of absolute ethanol. At the same time, 3 mmol of metal copper nitrate was dissolved in 30 mL of water. Under vigorous stirring, it was slowly added dropwise to the phosphotungstic acid solution, and a precipitate was formed immediately. After stirring and ...

Embodiment 2

[0035] (1)H 6 P 2 W 18 o 62 13H 2 The preparation of O is the same as in Example 1.

[0036] (2) Add 1mmol of H 6 P 2 W 18 o 62 13H 2 O was dissolved in a mixed solution of 5 mL of water and 20 mL of absolute ethanol. At the same time, 2 mmol of lanthanum nitrate was dissolved in 30 mL of water. Under vigorous stirring, it was slowly added dropwise to the phosphotungstic acid solution, and a precipitate was formed immediately. After stirring and reacting at 35°C for 3h, the solution was slowly evaporated to dryness, and dried in vacuum at 50°C overnight to obtain powdered La 2 P 2 W 18 o 62 ·nH 2 O.

[0037] (3) Dissolve 5mmol of ethyl p-hydroxybenzoate, 10.0mL of tetrabutyl titanate, and 5mL of glacial acetic acid in 20mL of absolute ethanol in sequence, and after stirring vigorously at room temperature for 60 minutes, under magnetic stirring, dissolve 5mL of water and 20mL of A mixed solvent of water and ethanol was added to the above solution. Stir for 120m...

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Abstract

The invention belongs to the technical field of organic chemistry, and discloses a preparation method of a visible-light response high-activity TiO2 composite photocatalyst. The method is characterized in that the adjustment and control of the structure of a Dawson structure substituted HPC@TiO2 molecular imprinting photocatalyst and the improvement of PPCPs degrading performance are treated as context objects; rare earth (transition) metal substituted counter cation visible-light response HPC is synthesized by methods such as the double decomposition method; the molecular imprinting TiO2 is prepared by methods such as a sol-gel method; a Dawson structure substituted HPC@TiO2 molecular imprinting photocatalyst is constructed by methods such as an impregnation method; FTIR and the like areused for representation; and typical PPCPs p-acetamidophenol, ethyl p-hydroxybenzoate and the like are degraded by visible light to observe the photocatalytic activity of a probe in reaction. The support number of the method in Natural Science Foundation of China is 51562016.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry, in particular to a visible light response high activity TiO 2 Preparation method of composite photocatalyst. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: New technologies to reduce the potential environmental threats of pharmaceuticals and personal care products (PPCPs) are increasingly valued. Due to its high chemical stability and non-toxicity, TiO 2 It is widely used in photocatalytic degradation of PPCPs. However, TiO 2 There are shortcomings such as being only excited by ultraviolet light and low quantum efficiency. Therefore, how to utilize TiO 2 Solar photocatalytic degradation of PPCPs is an urgent environmental material problem to be solved. Currently, Keggin-type heteropolyacid compounds (Heteropoly Compounds, HPC) are used to modify TiO 2 The preparation of composite photocatalysts has been widely stu...

Claims

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Application Information

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IPC IPC(8): B01J27/188C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J27/188C02F2101/38C02F2101/363B01J35/39
Inventor 占昌朝曹小华严平叶志刚徐平
Owner JIUJIANG UNIVERSITY
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