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零价铁修复铬污染水体的实验室研究

Keywords: 零价铁,铬污染,修复,水污染

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Abstract:

以废铁屑为原料,在实验室条件下研究了铬的去除效率和速率,同时研究了铁的投加量、溶液初始酸度、铬起始浓度、小分子阴离子(硫酸根、磷酸根、硝酸根、草酸根、柠檬酸根)等因素的影响,并对反应前后水溶液pH和氧化还原电位的变化作了对比研究。结果表明,铁能很快去除水体中的铬,且铬的去除速率随溶液的pH降低而增快;除柠檬酸根外,其他阴离子的存在均不同程度地促进了铬的去除速率和效率。反应前后,水体pH值升高,氧化还原电位降低。初步探讨了零价铁除铬和小分子阴离子对铬去除影响的机理。

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