黄铁矿催化H_2O_2氧化降解水中三氯生

Catalytic oxidation of triclosan in water by pyrite and hydrogen peroxide

以三氯生为目标污染物,研究了黄铁矿催化H2O2非均相类Fenton体系对污染物的去除效果,并利用SEM、EDS等手段对天然黄铁矿进行了表征。考察了催化剂、H2O2投加量、溶液初始pH、反应时间等重要因素对催化氧化反应的影响。在H2O2投加量5 mg/L,黄铁矿用量0.1 g/L,溶液初始pH为8,反应10 min后,三氯生的去除率达90%以上。相对于传统Fenton反应,pH对本非均相催化反应的影响较小,在2～10的pH范围内,仍有较高的催化活性。利用GC-MS分析显示,三氯生降解过程能够产生包括2,4-二氯苯酚在内的多种中间产物。

The treatment of pollutants through a heterogeneous Fenton-like oxidation process using pyrite catalyst by employing the triclosan as model contaminants as well as the characterization of pyrite using SEM and EDS techniques was investigated.A series of experiments were conducted to elucidate the influence of significant parameters on the oxidation system,such as catalyst dosage,initial H2O2 concentration,initial pH of the reaction medium and reaction time etc.Results indicate that the catalyst shows high activity in terms of triclosan removal.The removal rate of triclosan could be over 90% within 10 min of reaction at pH 8 when the initial concentration of H2O2 and pyrite dosage were 5 mg/L and 0.1 g/L,respectively.The effect of pH on this heterogeneous reaction is much weaker than that on traditional Fenton reagent.And the high activity of catalyst can be kept constant with the pH value ranging from 2 to 10.Reaction intermediates including 2,4-dichlorophen,formed in the degradation of triclosan were identified by GC-MS.