摘要
为了深入探讨4-氯酚(4-CP)在Fenton氧化体系中的降解机制,利用高效液相色谱(HPLC)等多种手段系统分析了反应过程中Fe2+、Cl-、氧化中间产物对苯二酚、1,4-苯醌、4-氯邻苯二酚和4-氯间苯二酚的浓度以及氧化还原电位(ORP)的变化规律.研究结果表明,Fe2+浓度经历了短暂的下降之后迅速上升到接近初始的水平,Fe2+/Fe3+的相互转化过程可以通过ORP的变化得到较灵敏的反映.通过对中间产物对苯二酚和1,4-苯醌变化规律的分析发现,反应中生成的对苯二酚和对苯醌可以互相转化,对苯二酚对Fe3+的还原可能导致了体系中Fe2+高比例的存在,从而提高了反应速度.研究还发现,羟基自由基与4-氯酚的反应主要通过邻、对位取代进行,但反应中也有少量间位取代物的生成.
In this article,the degradation mechanism of 4-chlorophenol（4-CP） by Fenton oxidation was investigated by monitoring the changes of Fe2＋,oxidation-reduction potential（ORP）,Cl-and organic intermediate products including hydroquinone,1,4-benzoquinone,4-chlorocatechol and 4-chlororesorcinol.The drastic change of ORP was attributed to the mutual transformation of Fe2＋/3＋.During the process,Fe2＋ remained to be the major form of iron,due to the reduction of Fe3＋ by hydroquinone.Mutual transformation between hydroquinone and 1,4-benzoquinone was observed.The substitution of 4-chlorophenol by · OH radicals mainly occurred at ortho-and para-sites,while a small portion of reaction occurred at the mata site.
出处
《环境化学》
CAS
CSCD
北大核心
2011年第11期1889-1893,共5页
Environmental Chemistry
基金
国家自然科学基金(50778168)
国家重大科技专项863项目(2009AA063901)
国家水体污染控制与治理科技重大专项(2008ZX07315-003)资助
