THE OXIDATIVE DEGRADATION OF 2-MERCAPTOBENZOTHIALZOLE BY DIFFERENT MANGANESE DIOXIDES

文献类型： 外文期刊

第一作者： Liu, Cheng-shuai

作者： Liu, Cheng-shuai;Gao, Yuan-xue;Liu, Hui;Zhang, Li-jia;Dong, Jun;Sun, Li-na

作者机构：

关键词： MBT;oxidation;organic pollutants;manganese dioxide;degradation

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN： 1018-4619

年卷期： 2010 年 19 卷 8A 期

页码：

收录情况： SCI

摘要： 2-Mercaptobenzothiazole (MBT) has been detected in wastewater and surface water in recent years, and its removal by minerals is an important issue. In this study, the degradation of MBT by different manganese dioxides was investigated with batch experiments. The physicochemical properties, including specific surface area (BET), average oxidation state (AOS), reduction potential (Eh), and point of zero charge (pH(PZC)) of the manganese dioxides, were also evaluated. The results showed that MBT can be efficiently degraded within four minutes. More importantly, the oxidative activities of different manganese dioxides were influenced by a combination of factors including BET, Eh, AOS, and pH(pzc). Manganese dioxides synthesized by the comproportionation method (CM) or liquid-phase oxidation method (OM) exhibited oxidative activities for MBT degradation with the order of delta-MnO(2) (CM) > alpha-MnO(2) (CM) > alpha-MnO(2) (OM) > gamma-MnO(2) (OM) > beta-MnO(2) (OM). The degradation kinetics based on MBT initial concentration, manganese dioxide dosages and pH values were also evaluated. Lower initial MBT concentration and pH, and higher manganese dioxide dosages can accelerate the degradation rate. The thermodynamical results showed that the apparent activation energy (E(a)) was negatively correlated with MBT degradation rates. The results in this study may provide penetrated insights for understanding the transformation and fate of organic pollutants with the presence of manganese dioxides in environment.

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