A modified montmorillonite complex was prepared out of montmorillonite and FeCl3·6H2O, and used in comparison between montmorillonite, iron oxide and the modified complex in adsorption of As(Ⅲ).Results show that the kinetics of the three adsorbents adsorbing As(Ⅲ) in water fit the Lagergren speed equation, and all belong to the sort of Freundlich sorption isotherm.The modified complex is obviously superior to the other two in setting efficiency.Besides, it is capable of regulating pH of the arsenic solution.Competitive adsorption experiments on some common ions come to the conclusion that calcium ion has some positive effect, while magnesium and sulfate has little on removal efficiency of arsenic, and nitrate and phosphate competes vigorously with As(Ⅲ) for adsorption.%利用蒙脱石、FeCl3·6H2O制备出改性蒙脱石复合体,并对蒙脱石、铁氧化物及其改性复合体吸附水中As(Ⅲ)的效能进行对比试验.结果表明:这3者对水中As(Ⅲ)的吸附动力学均符合Lagergren速度模型,且均属于Freundlich等温吸附.复合体的沉降效率明显优于其他2种吸附剂,且对含As(Ⅲ)溶液的pH值具有很好调节能力.SO42-和Mg2+浓度对As(Ⅲ)的去除基本无影响,Ca2+能促进As(Ⅲ)的吸附,NO3-、PO43-与As(Ⅲ)存在较强的竞争吸附.
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