Synergy of combining sonolysis and photocatalysis in the degradation and mineralization of chlorinated aromatic compounds.
Synergy of combining sonolysis and photocatalysis in the degradation and mineralization of chlorinated aromatic compounds.
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DOI：
10.1021/es0261630
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发表时间：
2003-04
影响因子：
11.4
通讯作者：
J. Peller;O. Wiest;P. Kamat
中科院分区：
文献类型：
--
作者：
J. Peller;O. Wiest;P. Kamat
已经使用模型除草剂如2，4-二氯苯氧基乙酸和2，4-二氯苯氧基丙酸以及氯代苯酚2，4-二氯苯酚和2，4，6-三氯苯酚探索了使用高级氧化工艺如超声分解和氧化降解以及两者的组合的优点。而超声波分解是非常有效的氯代芳香族分子的初始降解，完全矿化是难以实现的。光催化对极性化合物的降解具有选择性，但会导致不需要的化学中间体的积累。与超声降解相反，生物降解对实现完全矿化非常有效。通过同时进行高频超声分解和超声波降解，我们成功地实现了更快和完全的矿化，即使在非常低的催化剂负载下也没有有毒中间体的积累。讨论了两种高级氧化工艺的协同作用。
Merits of using advanced oxidation processes such as sonolysis and photocatalysis as well as a combination of the two have been explored using model herbicides such as 2,4-dichlorophenoxy acetic acid and 2,4-dichlorophenoxypropionic acid and the chlorinated phenols 2,4-dichlorophenol and 2,4,6-trichlorophenol. Whereas sonolysis is quite effective in the initial degradation of chlorinated aromatic molecules, complete mineralization is difficult to achieve. Photocatalysis is selective toward the degradation of polar compounds but causes the build up of undesirable chemical intermediates. In contrast to sonolytic degradation, photocatalysis is very effective toward achieving complete mineralization. By simultaneously carrying out high-frequency sonolysis and photocatalysis we have succeeded in achieving faster and complete mineralization with no build up of toxic intermediates even at very low catalyst loadings. The synergy of combining the two advanced oxidation processes is discussed.