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环境化学  2015 

反应条件对零价铁去除As(Ⅲ)动力学的影响

Keywords: Fe0,腐蚀,As(Ⅲ)去除,反应条件,影响因素

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Abstract:

考察了摇床转速、Fe0粒径、溶液pH、溶解氧以及背景电解质等条件对Fe0去除As(Ⅲ)速率的影响,并探讨了不同影响因素下的作用机制.结果显示,转速高于100r·min-1时,Fe0腐蚀速率明显加快,As(Ⅲ)去除速率提高,在50r·min-1时,Fe0腐蚀速率和As(Ⅲ)去除速率接近静止状态;Fe0粒径显著地影响As(Ⅲ)去除速率,粒径减小,速率增大.随着pH升高,As(Ⅲ)去除速率降低;低的pH能加速Fe0腐蚀,同时导致更多的具有吸附活性的新生态铁氧化物生成;空气环境可以显著促进Fe0的腐蚀从而加速As(Ⅲ)的去除速率.CaSO4作为背景电解质时,Fe0的腐蚀行为更接近其在天然水体中的腐蚀行为.

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