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盐酸羟胺促进针铁矿异相Fenton反应降解有机污染物的研究
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摘要
本文以甲草胺为目标污染物,着重研究了盐酸羟胺促进针铁矿异相Fenton氧化降解有机污染物的动力学过程以及机理。盐酸羟胺的加入,可以加速针铁矿表面铁循环,从而大大地提高了双氧水在针铁矿表面的分解效率以及羟基自由基的生成速率,进而促进污染物的氧化降解。本文详细研究了甲草胺在这个氧化体系中的降解效率,脱氯和脱氮情况,总有机碳的去除效率,以及甲草胺的降解路径。
In this study,we demonstrate that adding hydroxylamine(NH2OH) into the goethite(α-Fe OOH) heterogeneous Fenton system offers a new efficient way for Fenton-like organic pollutants degradation at pH 5.The presence of NH2 OH in the α-Fe OOH Fenton system could extremely improve the decomposition efficiency of H2O2 to produce ·OH.Moreover,there was almost no Fe(III) and Fe(II) detected in the reaction solution,indicating that H2O2 decomposition happened only on α-Fe OOH surface.The high degradation efficiency of organic pollutants in the α-Fe OOH/HA Fenton system was attributed to the effective Fe(III)/Fe(II) cycle over α-Fe OOH surface improved by NH2 OH,which served as a reducing and enabled the reuse of α-Fe OOH.The degradation of alachlor was then systematically investigated in the HA/α-Fe OOH Fenton system.Total organic carbon and ion chromatography results revealed the mineralization,dechlorination and denitrification of alachlor.
引文
[1]Zou,J.;Ma,J.;Chen,L.;Li,X.;Guan,Y.;Xie,P.;Pan,C.Environ.Sci.Technol.2013,47:11685.

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