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沉淀法制备氢氧化镁及其对砷溶液的吸附特性

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Abstract:

以蛇纹石制备的硫酸镁为镁源,以氨气为沉淀剂,常压下采用一步法制备氢氧化镁。对氢氧化镁吸附处理含砷(Ⅴ)废水进行了研究,考察了氢氧化镁用量、pH值、吸附时间及砷初始浓度等因素对砷(Ⅴ)去除效果的影响,并探讨了吸附作用机理。结果表明氢氧化镁对废水中砷(Ⅴ)的去除率为76.45%,氢氧化镁对水溶液中砷(Ⅴ)的吸附量随吸附时间的变化规律符合Langmuir吸附等温模式,而吸附量随砷起始浓度的变化则符合Freundlich吸附等温模式。

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