水蒸气对有机污染物微波光催化氧化反应的影响

 以C2H4和C2HCl3为模型有机污染物，考察了不同反应条件下水蒸\r\n气对微波催化反应性能的影响．结果表明，水蒸气的存在是影响微波光\r\n催化反应性能的重要因素．由于微波对物质的极化作用不同，在加水的\r\n微波光催化反应过程中微波能量主要被水吸收，微波场对水的脱附有利\r\n于提高加水条件下C2H4微波光催化氧化活性，但不利于需要水的C2HCl\r\n3氧化反应的进行．

Effect of Water Vapor on Microwave-Assist ed Photocatalytic Oxidation of Organic Pollutants over Titania

It is known that the competitive adsorption of water vapor onto photocatalyst causes a negative effect on gas solid photocatalytic reaction. In this paper, the effect of water vapor on the microwave assisted photocatalytic oxidation of C 2H 4 and C 2HCl 3, with which as model organic pollutants, was examined under different reaction conditions. The results showed that H 2O was an important factor to the photocatalytic oxidation. Because polarization of different substances is quite different in microwave field, the energy of microwave was mostly absorbed by H 2O for the photocatalytic reaction with water vapor. The improvement of C 2H 4 photocatalytic reactivity was attributed to desorption of water vapor from the catalyst surface in microwave field. However, the result of C 2HCl 3 oxidation was opposite, where H 2O was required to complete the reaction.