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本文采用一种简单的方法制备了混晶相(锐钛矿/板钛矿)纺锤形二氧化钛.首先,硫酸氧钛被选择为前驱体,通过水热合成以及惰性气氛下的热处理过程,得到一系列混晶相(锐钛矿/板钛矿)二氧化钛,其中,组成为85.5%锐钛矿、14.5%板钛矿的二氧化钛具有最优异的光催化分解水制氢活性,产氢速率为290.2μmol h-1.研究发现锐钛矿/板钛矿晶相间异质结的存在能够有效的分离光生载流子,同时进一步提高对电子的捕获,实现光催化分解水制氢效率的显著提高,这种基于硫酸氧钛水热合成方法得到的高活性光催化剂在制氢领域具有潜在的应用价值.
In this paper, a mixed-phase (anatase / brookite) spindle-shaped titanium dioxide was prepared by a simple method.Firstly, titanyl sulfate was selected as a precursor by hydrothermal synthesis and heat treatment in an inert atmosphere to obtain a Series of mixed crystal phase (anatase / brookite) titanium dioxide, wherein the titanium dioxide with the composition of 85.5% anatase and 14.5% brookite has the most excellent photocatalytic decomposition activity for hydrogen production and the hydrogen production rate is 290.2 μmol h-1. The study found that the presence of anatase / brookite intergranular heterojunction can effectively separate photo-generated carriers, and at the same time further improve the capture of electrons to achieve a significant increase in the efficiency of photocatalytic decomposition of water to produce hydrogen, which Highly active photocatalysts based on hydrothermal synthesis of titanyl sulfate have potential applications in the hydrogen production.