Metal modified titanium dioxide aqueous sol with high visible light activity, as well as synthesis and application of metal modified titanium dioxide aqueous sol

A titanium dioxide and metal modification technology, which is applied in the fields of inorganic nanomaterials and photocatalysis, can solve the problems of little improvement in catalyst activity, weak crystal activity, poor stability, etc., and achieves good sol dispersion stability, simple process operation, and efficient catalysis. performance effect

Active Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Description
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Problems solved by technology

These reported methods mainly use high-concentration acetic acid solution or hydrogen peroxide as the gelling method of the oxidant, wherein the residual acetic acid in the hydrosol of the high-concentration acetic acid method causes the peculiar smell of the sol, and the prepared TiO 2 The grain activity is weak; while hydrogen peroxide has a strong oxidizing property, the activity of the modified catalyst is not much improved and the stability is poor, which is not conducive to large-scale application in actual production

Method used

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  • Metal modified titanium dioxide aqueous sol with high visible light activity, as well as synthesis and application of metal modified titanium dioxide aqueous sol
  • Metal modified titanium dioxide aqueous sol with high visible light activity, as well as synthesis and application of metal modified titanium dioxide aqueous sol

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Embodiment 1

[0029] (1) Dissolve tetrabutyl titanate in absolute ethanol solution, wherein the volume ratio of tetrabutyl titanate to absolute ethanol is 1:2, and mix evenly to obtain colorless and transparent dispersion A; (2) Disperse Solution A is slowly added dropwise into the nitric acid solution containing platinum nitrate and potassium chloroplatinate, wherein the molar ratio of platinum nitrate to potassium chloroplatinate is 0.01, the molar ratio of metal to titanium is 0.05%, the pH of the acidic solution is 0.5, and the dispersion The volume ratio of liquid A to acidic solution is 0.01. The mixed solution was stirred and reacted at 45 degrees for 4 hours to synthesize the dispersion B; (3) the above dispersion B was moved into a stainless steel reactor lined with polytetrafluoroethylene, and hydrothermally treated at 100 degrees for 4 hours; (4) the hydrothermally treated Reactor is cooled to room temperature, centrifuged and washed, water is added to make the solid content 0.1%...

Embodiment 2

[0031] (1) Dissolve tetraethyl titanate in isopropanol solution, wherein the volume ratio of tetraethyl titanate to isopropanol is 1:10, mix well to obtain colorless and transparent dispersion A; (2) disperse Solution A is slowly added dropwise to the hydrochloric acid solution containing copper nitrate and sodium chloroaurate, wherein the molar ratio of copper nitrate to sodium chloroaurate is 5, the molar ratio of metal to titanium is 5%, the pH of the acidic solution is 3, and the dispersion The volume ratio of liquid A to acidic solution is 1. The mixed solution was stirred and reacted at 95 degrees for 24 hours to synthesize the dispersion B; (3) the above-mentioned dispersion B was moved into a stainless steel reactor lined with polytetrafluoroethylene, and hydrothermally treated at 200 degrees for 48 hours; (4) the hydrothermally treated Cool the reaction kettle to room temperature, centrifugally wash, add water so that the solid content is 10%, and use 500 watts of ult...

Embodiment 3

[0033] (1) Dissolve tetraisopropyl titanate in methanol solution, wherein the volume ratio of tetraisopropyl titanate to methanol is 1:5, and mix evenly to obtain colorless and transparent dispersion A; (2) Dispersion A Slowly add it dropwise to the nitric acid solution containing ferric chloride and potassium chloroplatinate, wherein the molar ratio of ferric chloride to potassium chloroplatinate is 1, the molar ratio of metal to titanium is 0.5%, the pH of the acidic solution is 2, disperse The volume ratio of liquid A to acidic solution is 0.6. The mixed solution was stirred and reacted at 75 degrees for 12 hours to synthesize the dispersion B; (3) the above-mentioned dispersion B was moved into a stainless steel reactor lined with polytetrafluoroethylene, and hydrothermally treated at 160 degrees for 24 hours; (4) the hydrothermally treated Cool the reaction kettle to room temperature, centrifugally wash, add water so that the solid content is 5%, and use 200 watts of ultr...

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Abstract

The invention relates to metal modified titanium dioxide aqueous sol with high visible light activity, as well as synthesis and application of the metal modified titanium dioxide aqueous sol. A combined technology of sol-gel and hydrothermal treatment is adopted, TiO2 nanometer particles are modified in a combined manner of surface modification of metal ions and internal doping of cells, so that the TiO2 nanometer particles have efficient visible light catalysis activity. The solid content of modified titanium dioxide in the aqueous sol is 0.1-10%, the mole ratio of metal to the titanium dioxide in the aqueous sol is (0.05-5%) to 1, the largest absorption wave length of a spectrum is 400-800nm, the magnitude of nanometer particles of the modified titanium dioxide is 2-20nm, the pH value of the aqueous sol is 2-9, and the aqueous sol is stable to disperse. Compared with the prior art, the metal modified titanium dioxide aqueous sol disclosed by the invention is simple in technological operation and good in dispersion stability; and the synthesized metal modified titanium dioxide aqueous sol disclosed by the invention has efficient catalytic properties in a wide wavelength range, can be applied to household livings of purification of indoor air, bacterium resistance, deodorization and the like, and can also be used for environmental protection trade of decomposing organic contaminants which are difficult to degrade in waste water and waste gas, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterials and photocatalysis, and relates to the preparation of a modified titanium dioxide sol, in particular to a metal-modified titanium dioxide hydrosol with high visible light activity and its synthesis and application. Background technique [0002] With the rapid development of industry and urban living standards, human beings directly or indirectly discharge harmful substances or energy to the environment that exceeds their self-purification capabilities, and a large number of organic compounds are discharged into our living environment, which not only causes resource shortages, but also affects the environment. Caused a large degree of pollution, endangering human health and survival. Therefore, environmental problems have increasingly become the focus of attention from all walks of life, and developing a simple and effective method to control environmental pollution has become an ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/656B01J23/89
CPCB01J23/42B01J23/6562B01J23/8906B01J23/8926B01J35/004B01J35/006B01J35/12
Inventor 龙明策黄通郑龙辉
Owner SHANGHAI JIAO TONG UNIV
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