Method for preparing photocatalyst with core-shell structure

Abstract

The invention relates to a method for preparing a photocatalyst with a core-shell structure, which comprises the following steps: (A) activating an acid-resisting non-metallic ore or a non-metallic synthetic compound, and removing acid-soluble impurities; (B) under the synergistic action of hydrochloric acid and a macromolecular compound, moderately hydrolyzing titanium tetrachloride, and preparing the hydrolyzate required for coating a core; and (C) depositing and coating the core and a shell. The invention has the advantage that under the conditions of normal pressure, low temperature and no need of high temperature calcination, 2-8 nanometers of titanium dioxide particles are deposited and coated on the surface of an acid-resisting non-metallic inorganic mineral or a synthetic inorganic compound. The preparation technology not only keeps the high catalytic activity of 2-8 nanometers of titanium dioxide but also eliminates the defect of agglomeration or coating of photocatalytic materials in application systems, such as plastics, paint and the like. Compared with the prior method, the anatase type nano titanium dioxide coated on the surface can form a complete crystal at the temperature lower than 100 DEG C without calcination, thus the invention has simple preparation technology and low energy consumption and is suitable for industrial production.

Description

【Technical field】 [0001] The invention relates to a method for preparing a photocatalyst, in particular to a method for preparing a photocatalyst with a core-shell structure by utilizing the synergistic effect of a polymer and a hydrochloric acid solution without high-temperature calcination. 【Background technique】 [0002] Semiconductor TIO since 1979 2 Since the photocatalytic effect was discovered by two scholars in Japan, Fujishima and Honda, after nearly 30 years of hard work, the application research of the photocatalytic effect has made breakthrough progress, especially in 1993, Fujishima et al proposed the application of photocatalysts to the environment. Since the proposal of purification, photocatalytic materials have been widely used in antifouling, antibacterial, deodorization, air purification, water treatment and environmental pollution control, and have formed a considerable scale industry. [0003] In terms of photocatalytic research and application, Japan h...

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Problems solved by technology

[0005] At present, some literatures and patents at home and abroad have reported this research and development idea of ​​loading nano-titanium dioxide with large particle size, which can be divided into physical method coating and chemical method coating, in which physical method coating is only through simple core and The outer shell is heated and mixed, and nano-titanium dioxide is physically deposited on the surface of the inner core, which is easy to fall off during use, so the use effect is not good. For example, Xu Jin applied for patent CN1669634A

Due to the restriction of the preparation process of nano-titanium dioxide by chemical method coating, its preparation ideas can be divided into (1), sol-gel-infiltration and pulling method, such as the patent CN1408473A applied by Zhu Yongfa, the preparation of nanocrystalline titanium dioxide photocatalyst supported on the surface of large particles Method; (2), alkali deposition of titanyl sulfate (titanium sulfate, titanium tetrachloride, n-butyl titanate), such as Chen Yingxu's patent application CN1476928A, supported titanium dioxide photocatalyst and preparation method; (3), tetrachloride Titanium high-pressure hydrolysis deposition, such as the patent CN1683073A applied by Qujifang, a preparation method of nano-titanium dioxide bentonite composite material, these three preparation methods need to go through drying and calcination processes to dehydrate the titanium dioxide hydrate loaded on the surface of the inner core It is transformed into a complete anatase nano-titanium dioxide crystal, so the preparation process is cumbersome, and the energy consumption is high. The nano-titanium dioxide grains coated on the surface are large, and the photocatalytic effect is not very ideal.

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