Method of producing original position complex sol of tin and titanium

Abstract

The invention relates to a preparation method of a photocatalytic sol, and aims to provide a preparation method of a tin-titanium in-situ composite sol. The method comprises the following steps: (1) adding excess alkali to the tin tetrachloride solution, adding the tin hydroxide obtained by the reaction to peptize in water and leaving it to age to obtain tin oxide sol; (2) adding the tin hydroxide obtained in step (1) adding an inorganic acid to the tin oxide sol, so that the pH value of the tin oxide sol is 0.1 to 5; (3) adding at least one of titanium tetrachloride, titanium sulfate or butyl titanate into the alcohol dilution solvent under stirring conditions, Stir evenly to obtain a solution, add the solution dropwise to the solution obtained in step (2) under constant stirring at a water bath temperature of 5-95° C., and then stand and age to obtain a tin-titanium in-situ composite sol. By adopting the invention to prepare the sol, common high-temperature heat treatment is avoided, and the in-situ composite of tin oxide and titanium oxide is realized at room temperature, so that the final composite sol has enhanced visible light catalytic effect.

Description

technical field [0001] The invention relates to a preparation method of photocatalytic sol, more specifically, relates to a preparation method of visible light catalyzed tin-titanium in-situ composite sol. Background technique [0002] Titanium oxide has good application prospects in the fields of energy and environmental protection; pure titanium oxide must be excited by ultraviolet light, and the utilization rate of daily visible light is low. Many researchers have increased the utilization of visible light by titanium oxide through ion doping, semiconductor compounding, etc.; but its heat treatment process greatly limits the application method and scope of titanium oxide, making it difficult to heat-resistant (such as plastic) or difficult to heat. (such as walls) field applications. [0003] The applicant is Zhejiang University, and the invention patent with application number CN200510061118.6 describes a method for preparing titanium oxide sol with photocatalytic prope...

AI Technical Summary

Problems solved by technology

The prepared sol contains anatase crystals grown in situ, so the sol directly has photocatalytic activity, avoiding the high temperature heat treatment in the traditional process, but its ability to catalyze visible light is weak

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