Simultaneous degradation of 4CP and EDTA in a heterogeneous Ultrasound/Fenton like system at ambient circumstance
Simultaneous degradation of 4CP and EDTA in a heterogeneous Ultrasound/Fenton like system at ambient circumstance
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DOI：
10.1016/j.seppur.2009.06.007
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发表时间：
2009-08
影响因子：
8.6
通讯作者：
Tao Zhou;T. Lim;Xiao-hua Lu;Yao-zhong Li;F. Wong
中科院分区：
文献类型：
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作者：
Tao Zhou;T. Lim;Xiao-hua Lu;Yao-zhong Li;F. Wong
采用非均相超声波/芬顿类体系同时降解4-氯苯酚（4 CP）和乙二胺四乙酸（EDTA）。该体系采用零价铁（ZVI），通过铁/EDTA配体反应催化氧气活化自生H2 O2。结果表明，4CP和EDTA的降解均符合准一级动力学方程。分别讨论了各反应组分的作用，考察了初始操作参数对4CP和EDTA降解率的影响。结果表明，4CP与EDTA之间存在较弱的竞争降解关系。ZVI和EDTA是其基本组分，对两种化合物的降解有重要影响。超声通过空化效应克服OO带的动力学障碍，协同提高降解速率。非自由基降解途径似乎是可信的，铁基-EDTA络合物（[FeIVO]EDTA）而不是OH被确定为主要氧化剂。
Simultaneous degradation of 4-chlorophenol (4CP) and Ethylenediaminetetraacetic acid (EDTA) was investigated in a heterogeneous Ultrasound/Fenton like system. In this system, zero valent iron (ZVI) was adopted and H2O2was self-produced through oxygen activation catalyzed by iron/EDTA ligand reactions. It was found that pseudo first-order degradation kinetic was well applied for both 4CP and EDTA. The role of reaction components was discussed respectively and the effects of initial operating parameters on the degradation rate of 4CP and EDTA were investigated. The results showed that the competitive degradation relationship between 4CP and EDTA is weak. ZVI and EDTA are the essential components and they have important effect on the degradation of both compounds. Ultrasound (US) presented synergistic improvement on the degradation rate through overcome kinetic barrier of OO band by ultrasonic cavitation effect. A non-radical degradation pathway seems credible and ferryl-EDTA complex ([FeIVO]EDTA) instead of OH is identified as the principal oxidant.