Notice of RetractionOxidation of As(III) by Hydrous Manganese Oxide: Effect of Carbonate

2011 5th International Conference on Bioinformatics and Biomedical Engineering Pub Date : 2011-05-10 DOI:10.1109/ICBBE.2011.5780763

Zhixi Zhao, S. Zhao, Yongfeng Jia

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Abstract

The mobility of arsenic in aquatic environment is largely governed by its speciation and adsorption on the surfaces of minerals. Hydrous manganese oxide (HMO) plays an important role in redox transformation of arsenic in aquatic environment and is available for remedy of groundwater with high arsenic concentration. Carbonate is often present as major anion in groundwater and its influence on adsorption and transformation of arsenite (As(III)) on HMO is not understood well. This work studied the effect of carbonate on the adsorption and oxidation of As(III) on HMO. The results showed that oxidation of As(III) followed first-order kinetics. The reaction rate constant in the presence of carbonate (k1 = 0.365 h-1) was 2.4 times higher than that in the absence of carbonate (k1 = 0.152 h-1). Precipitation of manganese carbonate may be responsible for the enhanced oxidation of As(III) since adsorption of Mn(II) on HMO will decrease the number of active sites for As(III) oxidation. Precipitation of Mn(II) may also control the manganese pollution by suppressing Mn(II) release.

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含水氧化锰还原氧化As(III):碳酸盐的影响

砷在水环境中的迁移在很大程度上受其形态和在矿物表面的吸附所控制。水合氧化锰(HMO)在水环境中对砷的氧化还原转化起着重要的作用，可用于高砷地下水的治理。地下水中碳酸盐常作为主要阴离子存在，其对亚砷酸盐(as (III))在HMO上吸附转化的影响尚不清楚。研究了碳酸盐对HMO吸附和氧化As(III)的影响。结果表明，As(III)的氧化符合一级动力学。有碳酸盐时的反应速率常数(k1 = 0.365 h-1)比无碳酸盐时的反应速率常数(k1 = 0.152 h-1)高2.4倍。碳酸锰的沉淀可能是As(III)氧化增强的原因，因为Mn(II)在HMO上的吸附会减少As(III)氧化的活性位点数量。Mn(II)的沉淀也可能通过抑制Mn(II)的释放来控制锰的污染。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 5th International Conference on Bioinformatics and Biomedical Engineering

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