【摘要】 通过对不同工艺参数的考察及催化剂活性组分变化的分析,探讨了VO2/硅胶催化臭氧化降解磺基水杨酸的机理.结果表明,催化体系的本质是催化剂中的四价钒催化臭氧分解生成了活性更高的羟基自由基,所生成的五价钒对体系化学耗氧量(COD)的去除也有很大的贡献(近10%).循环使用试验表明,20min时,VO2/硅胶催化剂在第1次和第10次的COD去除率分别为76%和70%,显示了较好的应用前景.更多还原

【Abstract】 In order to probe into the mechanism of VO2/silica gel catalytic ozonization degrading sulfosalicylic acid (SSal), different technological parameters were investigated and changes of catalyst active components were analyzed. The free hydroxyl radical of greater activity produced in the catalytic ozonization of V(IV) is the essence of the catalytic system; and the formed V(V) also contributed greatly to the removal of chemical oxygen demand (COD). The recycled tests show that fresh catalyst and the used catalyst at ten times have the removal rate of COD are 76% and 70% in 20 min, respectively, this result illuminates that VO2/silica gel catalyst has excellent prospects for application.更多还原