Cu2+强化Fenton反应氧化降解2,4,6-三氯酚

Degradation of 2,4,6 trichlorophenol by copper ion enhanced Fenton reaction

摘要:

为强化Fenton反应氧化降解水中2,4,6-三氯酚的效能,在Fenton体系中加入另一种过渡金属离子Cu2+．结果表明:在酸性条件下,二价铜离子本身不具有类似亚铁离子催化分解过氧化氢氧化有机物的能力;将铜离子引入Fenton反应体系后,能明显提高2,4,6-三氯酚的氧化降解速率,强化过氧化氢的分解,增加TOC的去除率以及氯离子的释放;较低投量的铜离子就能有明显的强化作用;自由基抑制剂甲醇、叔丁醇对反应的完全抑制说明羟基自由基仍然是铜离子参与的Fenton反应中的主要活性物种．

Abstract:

In order to enhance the Fenton oxidation of 2,4,6-trichlorophenol, copper ion was introduced to the Fenton reaction. The results show that, differing from ferrous ion, the copper ion exhibits no capability to decompose hydrogen peroxide to degrade the organic substrates; however, it can accelerate the degradation rate of 2,4,6-trichlorophenol by Fenton reaction, enhance the decomposition of hydrogen peroxide, increase the removal efficiency of TOC and release of chloride ion. Even lower copper ion dosage have significant enhancement on the degradation. The result of complete inhibition of the reaction by methanol and tert-Butanol suggests that hydroxyl radical is the most important reactive species in the Cu2+ enhanced Fenton reaction.