Ouédraogo Igor W K, Pehlivan Erol, Tran Hien T, Bonzi-Coulibaly Yvonne L, Zachmann Dieter, Bahadir Müfit
Laboratoire de Chimie Analytique, Environnementale et Bio-Organique, UFR-SEA, Université de Ouagadougou, 03 BP 7021 Ouagadougou 03, Burkina Faso E-mail:
Department of Chemical Engineering, Selcuk University, Campus, 42031 Konya, Turkey; Institute of Ecological Chemistry and Waste Analysis, Technical University of Braunschweig, Hagenring 30, Braunschweig 38106, Germany.
J Water Health. 2015 Sep;13(3):726-36. doi: 10.2166/wh.2015.242.
Because of the recognition that arsenic (As) at low concentrations in drinking water causes severe health effects, the technologies of As removal have become increasingly important. In this study, a simplified and effective method was used to immobilize iron oxyhydroxide onto a pretreated naturally occurring rice straw (RS). The modified RS adsorbent was characterized, using scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analyzer, and surface area analyzer. Experimental batch data of As(V) adsorption were modeled by the isotherms and kinetics models. Although all isotherms, the Langmuir model fitted the equilibrium data better than Freundlich and Dubinin-Radushkevich models and confirmed the surface homogeneity of adsorbent. The iron oxyhydroxide-coated rice straw (IOC-RS) was found to be effective for the removal of As(V) with 98.5% sorption efficiency at a concentration of <50 mg/L of As(V) solution, and thus maximum uptake capacity is ∼22 and 20 mg As(V)/g of IOC-RS at pH 4 and 6, respectively. The present study might provide new avenues to achieve the As concentrations required for drinking water recommended by the World Health Organization.
由于人们认识到饮用水中低浓度的砷（As）会对健康造成严重影响，砷去除技术变得越来越重要。在本研究中，采用一种简化有效的方法将羟基氧化铁固定在预处理的天然稻草（RS）上。使用扫描电子显微镜、傅里叶变换红外光谱、热重分析仪和表面积分析仪对改性后的RS吸附剂进行了表征。用等温线和动力学模型对As（V）吸附的实验批次数据进行了建模。尽管所有等温线中，Langmuir模型比Freundlich模型和Dubinin-Radushkevich模型能更好地拟合平衡数据，并证实了吸附剂的表面均匀性。发现涂覆有羟基氧化铁的稻草（IOC-RS）对As（V）的去除有效，在As（V）溶液浓度<50 mg/L时吸附效率达98.5%，因此在pH值为4和6时，最大吸附容量分别约为22和20 mg As（V）/g IOC-RS。本研究可能为达到世界卫生组织推荐的饮用水砷浓度要求提供新途径。
