纳米TiO2薄膜的制备及对乙烯工业废水的光催化降解

采用溶胶-凝胶法，在玻璃载片上负载纳米TiO2薄膜，并通过对乙烯工业废水的光催化降解实验来评价其活性。正交实验结果表明，溶胶制备的最佳条件为：采用滴加方式加水，加水量为1.2mL，TNB与C4H9OH，AcAc，CH3COOH的体积比分别为1：10， 5：2，1：1， AcAc与NH(C2H5O)2的体积比为1：1。用正丁醇作为溶剂，负载2层膜，在煅烧温度为420℃、煅烧时间为1h、光催化降解时间为2.5h时，制备的纳米TiO2薄膜对乙烯工业废水的光催化降解效果最佳，降解率达到84.7%。XRD和红外光谱表征结果表明，所制备的薄膜为纳米TiO2薄膜，晶型为锐钛矿型，平均粒径为12.49nm。

PREPARATION OF NANO-TiO2 FILM AND ITS PHOTOCATALYSIS DEGRADATION OF WASTEWATER FROM ETHYLENE PLANT

The Nanometer TiO2 film was prepared on the glass slide by sol-gel method, and its photocatalytic performance was evaluated through photocatalytic degradation of wastewater from ethylene plant. The results of orthogonal tests showed that the optimum preparation conditions were as follows: 1.2mL water was adding by drops, the volume ratios of TNB to C4H9OH, CH3COOH, and AcAc were 1:10, 5:2 and1:1, respectively; the volume ratio of AcAc to NH(CH2CH2OH)2 was 1:1, using n-butyl alcohol as solvent, two layers of film were loaded, finally, calcination at 420℃, for 1h. Characterization results of XRD and FT-IR indicated that the prepared thin film was a nanometer TiO2 film having anatase structure and with an average particle diameter of 12.49 nm. Said prepared TiO2 film exhibited optimal photocatalytic degradation of ethylene wastewater, when the photocatalytic treating time was 2.5h, the degradation rate reached 84.7%.