1,1,2,2-四氯乙烷光催化脱氯的研究

Photo-catalytic Dechlorination of 1,1,2,2-Tetrachloroethane in Water by Using TiO_2 Sol

采用TiOSO4为前驱体,制备出比较稳定的纯水性透明TiO2溶胶,该溶胶为中性。利用该TiO2溶胶作为光催化剂对水中微量1,1,2,2-四氯乙烷进行紫外光催化处理。研究发现,1,1,2,2-四氯乙烷在光催化下分解并使溶液的电导率增加,表明在光催化分解下,不断生成氯离子和氢离子,不同的1,1,2,2-四氯乙烷的初始浓度和催化剂的用量等因素对光催化的脱氯的量都有一定的关联。在此实验条件下,固定光照时间,二氧化钛溶胶的浓度在5至10ppm时,光催化的效率达到最大,电导率的变化最大。

Titanium oxide sol was prepared using TiOSO4 as precursors, which is yellow, transparent, and long-term stable. Photocatalytic degradation experiment of 1,1,2,2-tetrachloroethane was conducted by using TiO2 as photo-catalyst under ultraviolet light, and was measured by conductivity instrument. The results revealed that the conductivity of solution was increased when tetrachloroethane degraded under UV radiating, and the degradation efficiencies of tetrachloroethane in water are influenced by the initial concentrations of tetrachloroethane, amounts of photo-catalyst and illumination intensities. In this experimental condition, the best concentration range of titanium oxide sol was between 5 to 10 ppm for diehlorination of tetrachloroethane solution.