Method for preparing tin-doped nano-amorphous titanium dioxide by using intermediate of chlorination process

Abstract

The invention relates to a method for preparing a tin-doped nano-amorphous titanium dioxide by using an intermediate of a chlorination process, belonging to the technical field of preparation of photocatalytic nanometer new materials. The method comprises the following steps: A, simultaneously adding tin tetrachloride and a refined intermediate product, which is produced during the preparation ofrutile titanium dioxide through the chlorination process, into a NaOH mixed aqueous solution containing a surfactant in a parallel flow manner by using a peristaltic pump at room temperature, then adding an aqueous solution of ammonium carbonate, raising temperature to 70-80 DEG C, continuing stirring, performing curing, and then carrying out cooling to room temperature so as to prepare a tin-doped TiO2 hydrate; B, subjecting the tin-doped TiO2 hydrate to pressure filtration, performing washing until the conductivity of a filtrate is less than 10 [mu]s / cm so as to obtain a filter cake; C, drying the filter cake by using microwave drying equipment so as to prepare tin-doped amorphous titanium dioxide; and D, doping the amorphous titanium dioxide with tin, and performing jet milling to prepare tin-doped nano-amorphous titanium dioxide. The tin-doped nano-amorphous titanium dioxide prepared in the invention has the function of efficiently degrading organic pollutants under visible light.

Description

technical field [0001] The invention belongs to the technical field of preparation of new photocatalytic nanometer materials, and in particular relates to a method for preparing tin-doped nano-amorphous titanium dioxide by using a chlorination method intermediate. The invention adopts titanium tetrachloride, an intermediate product of rutile titanium dioxide prepared by a chlorination method, as a basic raw material to prepare a tin-doped nano-amorphous titanium dioxide visible light catalyst, which has the effect of efficiently degrading organic pollutants under visible light. Background technique [0002] As a photocatalyst, titanium dioxide has the advantages of stable chemical properties, non-toxicity, and strong ultraviolet light absorption performance. It has a wide range of applications in many fields such as photocatalysis, photoelectric conversion, and self-cleaning materials. Due to the crystalline TiO 2 With a large band gap energy (3.2eV), it is impossible to us...

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Problems solved by technology

[0004] Although SnO 2 It is a wide bandgap semiconductor with a direct bandgap of 3.189eV, but due to the existence of several intrinsic defects: oxygen vacancies, tin vacancies, oxygen interstitials and tin interstitials, etc., its indirect bandgap is between 2.162 and 2.190eV , so that there is a non-stoichiometric structure, calculations show that oxygen defects and tin interstitials have particularly low binding energies among various defects

For titanium dioxide amorphous nanoparticles, researchers have also tried a variety of methods, such as sol-gel method, direct precipitation method, microemulsion method, etc., and finally they all need to be calcined at a temperature of about 300°C. Amorphous nano-titanium dioxide, in the existing preparation methods, there are generally problems of large particle size and serious agglomeration of the prepared product, as well as the environmental pollution problem of the calcined product.

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