Unusual catalytic effects of iron salts on phenol degradation by glow discharge plasma in aqueous solution.
Unusual catalytic effects of iron salts on phenol degradation by glow discharge plasma in aqueous solution.
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DOI：
10.1016/j.jhazmat.2008.04.037
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发表时间：
2009-01
影响因子：
13.6
通讯作者：
Lei Wang;X. Jiang
中科院分区：
文献类型：
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作者：
Lei Wang;X. Jiang
研究了铁盐对辉光放电等离子体 (GDP) 诱导的苯酚降解的催化作用。结果发现，铁离子比亚铁离子表现出更好的催化效果。原因是GDP可以同时产生羟基自由基和过氧化氢；羟基自由基与苯酚反应产生二羟基环己二烯基自由基，二羟基环己二烯基自由基将三价铁离子还原为亚铁离子，新形成的亚铁离子催化过氧化氢产生更多的羟基自由基。在没有铁盐的情况下，溶液的TOC随着处理时间的推移逐渐降低，而溶液的COD由于过氧化氢的积累而增加。如果没有铁盐，儿茶酚、氢醌和羟基氢醌是主要副产物。然而，在铁盐存在下会产生大量儿茶酚、氢醌和苯醌。本研究提供了一些与芬顿反应相关的新信息。
Catalytic effects of iron salts on phenol degradation induced by glow discharge plasma (GDP) were examined. It was found that ferric ions showed much better catalytic effect than that of ferrous ions. The reason was that GDP could produce hydroxyl radicals and hydrogen peroxide simultaneously; the hydroxyl radicals reacted with phenol to produce dihydroxycyclohexadienyl radicals which reduced the ferric ions to ferrous ions and the newly formed ferrous ions catalyzed the hydrogen peroxide to produce more hydroxyl radicals. Without iron salts, TOC of the solution gradually decreased with treatment time while COD of the solution increased due to the accumulation of the hydrogen peroxide. Without iron salts, catechol, hydroquinone, and hydroxylhydroquinone were major by-products. However, large amounts of catechol, hydroquinone and benzoquinone yielded in the presence of iron salts. The present study presents some new information related to Fenton's reaction.