Preparation method of nano TiO2 film modified by metal oxide

Abstract

The invention discloses a preparation method of a nano TiO2 film modified by metal oxide. The method comprises the following steps: firstly, a pure titanium sheet is prepared into 25mm*15mm*2mm rectangular sheet; secondly, the titanium sheet is conducted to pretreatment, and pretreatment comprises sanding, oil removing, hydrochloric acidizing fluid rinsing, ultrasonic deionized water cleaning and vacuum drying; thirdly, 2 to 20mmol metal oxide required to be conducted to doping is respectively coated on the surface of the pretreated titanium sheet through heated viscous polyvinyl alcohol, after drying, and the titanium sheet is directly arranged on micro-arc oxidation equipment to be conducted to micro-arc oxidation, wherein the titanium sheet is served as a positive electrode to be dipped in treating fluid, a stainless steel container with a cooling system is served as a negative electrode, and experiment parameters are as follows: the voltage is 420V, the preparation time is 30min, the content of Na3PO4 in a phosphate electrolyte system is 10g / L, the content of NaF is 1g / L, and the temperature of electrolyte is controlled to be lower than 35 DEG C; and fourthly, a prepared nano TiO2 film is conducted to deionized water rinsing and drying. The nano TiO2 film has high photocatalytic degradation ratio, and is beneficial to industrial production.

Description

technical field [0001] The present invention relates to a kind of nano TiO 2 Thin film materials, especially a metal oxide modified nano-TiO 2 Preparation method of thin film material. Background technique [0002] Among many semiconductor photocatalysts, TiO 2 Because of its strong oxidation ability, good chemical stability, high catalytic activity, and non-toxicity, it is at the core of photocatalytic research. As a semiconductor material, nano-titanium dioxide is non-toxic, cheap, high-activity, and high-stability. And other characteristics are widely used in self-cleaning, environmental pollution control and other fields. However, the preparation of nano-TiO 2 The method of this method generally has defects such as high cost, difficult control of the process, and unfavorable recovery and easy-to-lose granular powder of the obtained product. Unable to satisfy people's demand for high-quality TiO 2 Practical needs for photocatalysts. At present, nano-TiO in the form...

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Problems solved by technology

However, the preparation of nano-TiO 2 The method generally has defects such as high cost, difficult process control, unfavorable recycling, and easily lost granular powder.

Unable to satisfy people's demand for high-quality TiO 2 Practical needs of photocatalysts

At present, nano-TiO in the form of thin films 2 Photocatalysts have gradually replaced granular nano-TiO 2 It has become the focus of people's early research. Compared with the granular state, the thin film state has a firm combination and no loss, but it is inferior to the granular nano-TiO in terms of catalytic activity. 2 (When the film is attached, the specific surface area is reduced and the reaction area is also reduced)

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