Photocatalytic degradation of gaseous perchloroethylene: products and pathway.
Photocatalytic degradation of gaseous perchloroethylene: products and pathway.
复制标题
气态全氯乙烯的光催化降解：产物和途径。
DOI：
10.1016/s0045-6535(00)00140-5
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发表时间：
2001
期刊：
影响因子：
8.8
通讯作者：
M. Hosomi
中科院分区：
文献类型：
--
作者：
N. Fukami;M. Yosida;B. D. Lee;K. Taku;M. Hosomi
批量光催化降解1000 ppm的气态四氯乙烯（PCE）进行紫外光照射，使近100%被分解在10 min内。主要的中间体和最终产物被确定为三氯乙酰氯（TCAC）和氯化氢（HCl），分别和次要的二氯乙酸（DCAC），一氯乙酸（MCAC），四氯化碳，氯仿，和光气。超过90%的Cl−当量，即，PCE、中间体和HCl中的氯数总和在PCE降解期间得到补偿;结果表明在PCE降解期间不存在其他主要氯化中间体。在类似的实验中，500 ppm的气态TCAC在3小时内降解为HCl，而不产生DCAC或MCAC，其中与PCE一样，超过90%的Cl−当量，即，TCAC和HCl中的氯数之和在TCAC降解期间得到补偿。因此，气态PCE主要遵循PCE→TCAC→HCl的降解途径。
Batch photocatalytic degradation of 1000-ppm gaseous perchloroethylene (PCE) was conducted with UV irradiation such that nearly 100% was decomposed within 10 min. The main intermediate and final product were identified as trichloroacetylchloride (TCAC) and hydrogen chloride (HCl), respectively, and minor ones as dichloroacetic acid (DCAC), monochloroacetic acid (MCAC), carbon tetrachloride, chloroform, and phosgene. More than 90% of Cl−equivalent, i.e., the sum of the chlorine number in PCE, intermediates, and HCl, was compensated for during the time of PCE degradation; a result indicating that no other major chlorinated intermediates are present during the time of PCE degradation. In a similar experiment, 500 ppm of gaseous TCAC degraded into HCl within 3 h without producing DCAC or MCAC, where like PCE, more than 90% of Cl−equivalent, i.e., the sum of the chlorine number in TCAC and HCl, was compensated for during time of TCAC degradation. Accordingly, gaseous PCE is concluded to predominantly follow a degradation pathway of PCE→TCAC→HCl.