Preparation method for silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst

A titanium dioxide, phosphotungstic acid technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of secondary environmental pollution, low utilization of sunlight, etc. Quantum efficiency, the effect of enhancing photocatalytic activity

Inactive Publication Date: 2017-07-25
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
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Problems solved by technology

[0005] The present invention is in order to solve existing TiO 2 / H 3 PW 12 o 40 The light absorption range of the composite membrane catalyst is still concentrated in the ultraviolet region, which causes the problem of low utilization rate of sunlight, and the powdery TiO 2 / H 3 PW 12 o 40 Composite membrane catalysts cause secondary pollution to the environment, and a preparation method for silver-modified phosphotungstic acid / titanium dioxide composite membrane catalysts is provided

Method used

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  • Preparation method for silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst
  • Preparation method for silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst
  • Preparation method for silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst

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specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of silver-modified phosphotungstic acid / titanium dioxide composite membrane catalyst in this embodiment, the method is carried out according to the following steps:

[0034] 1. Mix and stir titanium tetraisopropoxide and isopropanol to obtain solution A; the volume ratio of titanium tetraisopropoxide and isopropanol is 1:(1~3);

[0035] Second, the H 3 PW 12 o 40 Dissolve in isopropanol to obtain B solution; AgNO 3 Dissolved in isopropanol to obtain C solution;

[0036] 3. Drop solution B and solution C into solution A in turn and stir to obtain mixed solution D, then add hydrolysis inhibitor to mixed solution D and stir to obtain mixed solution E, and then adjust the pH value of mixed solution E with HCl To 2~3, finally add distilled water to the mixed solution E and stir, stop stirring when the mixed solution E turns into a transparent sol;

[0037] The volume ratio of the B solution to the A solution is 1: (4-6); t...

specific Embodiment approach 2

[0045] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the H in the B solution described in step two 3 PW 12 o 40 The mass fraction is 9-11%. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0046] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the AgNO in the C solution described in step two 3 The mass fraction is 0.5-2%. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method for a silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst and relates to the preparation method for a composite membrane catalyst. The invention aims to solve the problem of low sunlight use ratio of a TiO2/H3PW12O40 composite membrane catalyst and the problem of secondary pollution to environment of a powdered composite membrane catalyst. The preparation method comprises the following steps: 1) preparing a mixed solution of titanium tetraisopropoxide and isopropyl alcohol; 2) preparing the mixed solution of dissolved H3PW12O40 and isopropyl alcohol; 3) mixing the two solutions; 4) preparing a sol after hydro-thermal treatment; and 5) spinning and ageing. The composite membrane catalyst prepared according to the invention can further promote the photocatalytic activity of TiO2/H3PW12O40 composite membrane and widen the response range thereof; the problems that most present catalysts are powdered, are difficult to be recycled and are easy to bring secondary pollution to the environment are solved; the preparation method is suitable for the preparation of the silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst.

Description

technical field [0001] The invention relates to a preparation method of a composite membrane catalyst. Background technique [0002] At present, photocatalytic technology has development prospects in the treatment of organic pollutants in water and has been widely concerned. Among them, the semiconductor titanium dioxide (TiO 2 ) can degrade organic pollutants in water at normal temperature and pressure without adding chemical reagents and without secondary pollution, and has become a research hotspot in the field of pollutant treatment at home and abroad. [0003] However TiO 2 There are still some deficiencies: such as TiO 2 has a high band gap energy, making TiO 2 Only under the irradiation of ultraviolet light with a wavelength less than 387nm, can the electronic transition be effectively excited; TiO 2 The recombination probability of photogenerated carrier electron-hole pairs is high, TiO 2 The quantum yield is low; TiO 2 Difficult to recycle, prone to secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01J35/02
CPCB01J27/188B01J35/004B01J35/02
Inventor 鲁楠关久念王雅琦王佳范凌云袁星连鹏
Owner NORTHEAST NORMAL UNIVERSITY
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