光化学法处理含铬（Ⅵ）含氰废水的研究

本文研究了影响半导体催化六价铬光致还原和氰根光致氧化的诸多因素.结果表明,催化剂(TiO_2、WO_3等)的活性不仅取决于本身的性质,还与制备方法有关,对这些催化剂表面作金属铂修饰能显著提高它们的催化活性,溶液的酸度以及溶液中三价铁离子和甲醇的存在均对六价铬光致还原有一定影响.加入少量过氧化氢能提高氰根的TiO_2催化光致氧化率,制作并试验了能连续有效地处理含铬(VI)含氰废水的光化学反应装置.

Photochemical Treatment of Wastewater Con-taining Dichromate and Cyanide.

The factors which influence on the photocatalytic reduction of dichromate and the photocatalytic oxidation of cyanide have been studied in this paper. In the process of photocatalytic reduction of dichromate, the catalytic activity of semiconductor (TiO2, WO3 etc) is dependent not only on its nature, but also on the preparation method of semiconductor. Surface modification of catalysts by piatium can substantially increase their photocatalytic activity. The process of dichromate photoreduction is also influenced by acidity of solution and the presence of ferric ions and methanoL The process of photocatalytic oxidation of cyanide ions is more efficient if the cyanide solution contains H2O2. From the viewpoint of practical application, a photochemical apparatus with TiO2-coated or TiO2-zeolite-coated photorcactor has been designed for treating wastewater continuously.