高比表面积介孔α-FeOOH的制备及其Sb（Ⅴ）吸附性能

采用水热合成的方法制备了高比表面积介孔α-FeOOH吸附剂,并探究其对水中Sb（Ⅴ）的去除效果。采用XRD、SEM、ATR-FTIR等方法对吸附剂进行了表征。考察了吸附剂投加量、溶液pH对Sb（Ⅴ）去除效果的影响,以及Sb（Ⅴ）吸附过程的动力学和热力学特性。表征结果显示：介孔α-FeOOH具有棒状结构,长度大约为50~100 nm,最可几孔径为20 nm,比表面积为137.6 m²/g。实验结果表明,当初始Sb（Ⅴ）质量浓度为10 mg/L、pH为7、介孔α-FeOOH投加量为0.25 g/L、吸附时间为2 h、吸附温度为25 ℃时,Sb（Ⅴ）去除率可达100%;pH为4~7时,Sb（Ⅴ）去除率受pH的影响较弱;Sb（Ⅴ）吸附过程符合拟二级动力学模型及Langmuir吸附模型。

Preparation of mesoporous α-FeOOH with high specific surface area and its adsorption capability to Sb（Ⅴ）

An adsorbent mesoporous α-FeOOH with high specific surface area was prepared by hydrothermal method and its removal capability to Sb（Ⅴ）in water was investigated. The adsorbent was characterized by XRD,SEM,ATR-FTIR and so on. The effects of α-FeOOH dosage and solution pH on Sb（Ⅴ）removal,and the kinetics and thermodynamic characteristics of Sb（Ⅴ）adsorption process were studied. The characterization results indicate that the mesoporous α-FeOOH has a rod-like structure with about 50~100 nm of length,20 nm of most probable pore size and 137.6 m²/g of specific surface area. The experimental results show that theremoval rate of Sb（Ⅴ）can reach 100% when the initial Sb（Ⅴ）mass concentration is 10 mg/L,the pH is 7,the α-FeOOH dosage is 0.25 g/L,the adsorption time is 2 h and the adsorption temperature is 25 ℃;In the range of pH 4-7,the removal rate of Sb（Ⅴ）is weakly affected by pH;The Sb（Ⅴ）adsorption process conforms to the pseudo second-order kinetic model and the Langmuir adsorption model.