The present study highlights performance of two adsorbents, namely aerocrete and vermiculite, modified with iron oxyhydroxide for removal As(V) from aqueous solution. A face-centered central composite design of response surface methodology (RSM) was employed to optimize efficacy of three experimental variables, adsorbent dosage, pH and initial As(V) concentration, and simultaneously the interactive effects of these variables on As(V) adsorption process were studied. The analysis of variance (ANOVA) of quadratic model shows that the predicted values are in good agreement with experimental data. The results show the leading effect of adsorbent dosage and initial As(V) concentration as well as interactive effect of these two variables on As(V) removal efficiency. Maximum As(V) removal 99.96% and 98.95% are obtained respectively for modified aerocrete and vermiculite at pH of 6, adsorbent dose of 3.1 g/l and initial As(V) concentration of 12 mg/l (ppm). The adsorption data are well fitted with the Langmuir and Freundlich isotherms.

中文翻译：

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使用低成本吸附剂去除As（V）：羟基氧化铁改性的航空混凝土和ver石

本研究着重介绍了用羟基氧化铁改性的两种吸附剂，即航空混凝土和ver石的性能，可从水溶液中去除As（V）。采用响应面方法（RSM）的面心中央复合设计来优化三个实验变量（吸附剂剂量，pH和初始As（V）浓度）的功效，并同时优化这些变量对As（V）吸附的相互作用过程进行了研究。二次模型的方差分析表明预测值与实验数据吻合良好。结果表明吸附剂剂量和初始As（V）浓度的主导作用以及这两个变量对As（V）去除效率的相互作用。最大As（V）去除率99.96％和98。pH值为6的改性航空混凝土和ver石分别获得95％的吸附剂量为3.1 g / l和初始As（V）浓度为12 mg / l（ppm）。吸附数据与Langmuir和Freundlich等温线非常吻合。