Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process
Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process
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DOI：
10.1016/j.ultsonch.2007.06.003
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发表时间：
2008-04-01
影响因子：
8.4
通讯作者：
Cravotto, Giancarlo
中科院分区：
文献类型：
--
作者：
Bremner, David H.;Di Carlo, Stefano;Cravotto, Giancarlo
本文报道了2，4-二氯苯氧乙酸（2，4-D）在零价铁和过氧化氢存在下的矿化（先进的芬顿工艺- AFP），同时受到声空化或水力空化。如果仅搅拌反应，则TOC去除率为57%，而油照射的数字为64%，尽管后者反应更快。单独使用超声波在60分钟的处理时间内仅去除11%的TOC。添加铁粉略微提高了降解程度，但在过氧化氢存在下观察到所有明显的增加，过氧化氢通过芬顿化学以及通过在超声存在下的解离作为羟基自由基的来源。水力空化与先进的芬顿工艺结合使用也被发现是一种有用的工具，用于连续修复被2，4-D污染的水。经过20密耳的处理后，残留的TOC降低到30%，这可能代表了剩余的高度不稳定的小有机分子。(c)2007 Elsevier B. V.保留所有权利。
The mineralisation of 2,4-dichloropheiloxyacetic acid (2,4-D) in the presence of zero-valent iron and hydrogen peroxide (the advanced Fenton process - AFP) whilst being subjected to acoustic or hydrodynamic cavitation is reported. If the reaction is merely stirred then there is 57% removal of TOC whilst oil irradiation the figure is 64% although the latter reaction is more rapid. Use of ultrasound alone results in only 11% TOC removal in 60 min of treatment time. Addition of iron powder marginally enhances the extent of degradation but ail appreciable increase is observed in the presence of hydrogen peroxide which acts as a source for hydroxyl radicals by Fenton chemistry as well as by dissociation in the presence of ultrasound. The use of hydrodynamic cavitation in conjunction with the advanced Fenton process has also been found to be a useful tool for continuous remediation of water contaminated with 2,4-D. After 20 mill of treatment the residual TOC is reduced to 30% and this probably represents the remaining highly recalcitrant small organic molecules. (c) 2007 Elsevier B.V. All rights reserved.