Zn^(2+)改性TiO_2对苯酚废水的光催化降解研究

Study on photocatalytic degradation of phenol wastewater by Zn^(2+)-doped Ti-O_2

采用溶胶-凝胶-浸渍法对二氧化钛进行Zn2+改性,并以苯酚废水为降解模型反应物,研究了Zn2+改性TiO2的光催化活性。结果表明,Zn2+改性能够提高二氧化钛的光催化活性,当Zn2+掺杂量为2.0%(质量百分比),煅烧温度为600℃,催化活性最好,当催化剂的投加量为3.0 g/L,通气量为600 mL/m in,pH值为3.3时,对苯酚废水溶液紫外灯光催化30 m in的降解率可达到98.2%。

Zn^2＋ -doped TiO2 coupled photocatalyst was prepared by sol-gel-dipping method. Being a model reaction, the photocatalytic degradation of phenol wastewater was investigated in Zn^2＋ -doped TiO2 powder suspension by UV-lamp. The results showed that the addition of Zn^2＋ to TiO2 enhanced its photocatalytic activity, and the optimum dipped content of Zn^2＋ was 2.0%, the optimum calcination temperature was 600℃ ; under the condition of amount of photocatalyst 3.0 g/L, initial pH 3.3, air flow 600 mL/min, the degradation rate of phenol wastewater was 98.2% by 20 W UV-lamp irradiated 30 min.