Rapid and efficient catalytic oxidation of As(III) with oxygen over a Pt catalyst at increased temperature
Rapid and efficient catalytic oxidation of As(III) with oxygen over a Pt catalyst at increased temperature
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DOI：
10.1016/j.cej.2017.04.117
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发表时间：
2017-10-01
影响因子：
15.1
通讯作者：
Kishida, Masahiro
中科院分区：
文献类型：
--
作者：
Zhao, Jinxian;Matsune, Hideki;Kishida, Masahiro
预氧化砷（As（III））为砷酸盐（As（V））是去除废水中有毒砷的关键步骤。在这项工作中，负载在金属氧化物上的Pt催化剂被施加到没有紫外线照射的As（III）的预氧化步骤。结果表明，由于Pt本身的催化活性，Pt催化剂能有效地促进As（III）在中性pH条件下的氧化反应。Pt/ZrO 2催化剂具有良好的稳定性和重复使用性能。As（III）的氧化速率对Pt颗粒的大小不敏感，且服从准一级动力学。表观活化能约为31.1 kJ/mol，这是在相对于氧为0.5阶的前提下得到的。(C)2017爱思唯尔B. V.保留所有权利。
The pre-oxidation of arsenite (As(III)) to arsenate (As(V)) is a critical step for the removal of toxic arsenic in wastewater. In this work, a Pt catalyst supported on metal oxide was applied to the pre-oxidation step of As(III) without UV irradiation. It is demonstrated that Pt catalyst can effectively promote the oxidation of As(III) using oxygen at neutral pH due to the catalytic activity of Pt itself. The Pt/ZrO2 catalyst possessed excellent stability and could be used repeatedly with high catalytic performance. The oxidation rate of As(III) was structure-insensitive to Pt particle size and obeyed pseudo-first-order kinetics in As (III). The apparent activation energy was about 31.1 kJ/mol, which was obtained on the premise of order of 0.5 with respect to oxygen. (C) 2017 Elsevier B.V. All rights reserved.