凹凸棒负载型TiO_2光催化剂的制备及改性研究

Study on preparation and improvement of palygorskite-TiO_2 as a photocatalytist

大部分化工废水成分复杂,毒性高,难以生物降解,文章以降解对苯二酚为例研究光催化氧化法的处理效果。实验以凹凸棒为载体,通过溶胶-凝胶法,以钛酸丁酯为主要原料,加入所制备的凹凸棒载体制成包覆粒子凹凸棒-TiO2光催化剂;以催化剂对对苯二酚的降解效果作为评价凹凸棒-TiO2样品光催化活性的标准,对其制备条件进行了优化,得到了光催化效果很好的复合光催化剂。采用水解沉淀法,以SnCl4.nH2O为主要原料制备了SnO2.nH2O,对凹凸棒-TiO2光催化剂改性,制成了凹凸棒-SnO2-TiO2光催化剂;通过对对苯二酚的降解效果,得到了催化剂各组分的最佳比例,并进行了模拟太阳光源的研究;最后用XRD和TEM等手段对样品进行了表征。

Wastewater from chemical industry is toxic and its complex compound is difficult to be biodegraded as well. This paper studies photocatalytic oxidation treatment effect by taking p-dihydroxybenzene degradation as an example. In the experiment, the palygorskite carrier is prepared. Then palygorskite-TiO2 is made by the sol-gel method, and in this reaction the Ti（OC4 H9）4 is the main material and the palygorskite is the core. In order to improve the photocatalytic degradation activity of palygorskite TiO2 for p-dihydroxybenzene, the conditions of preparing are selected and better photoeatalytic activity is obtained. With the SnCl4·nH2O as the main material, SnO2 · nH2O is prepared through the precipitation method so as to improve the photocatalytic degradation activity of palygorskite-TiO2 and prepare palygorskite-SnO2-TiO2. Through the photocatalytic degradation activity of palygorskite-SnO2-TiO2 for p-dihydroxybenzene, the better proportion of each parts is selected and some trials are done under the high pressure xenon lamp which can produce simulative sun＇s ray. The morphology and structure are characterized by XRD and TEM.