Hu Yifan, Yang Changzhu, Dan Jinfeng, Pu Wenhong, Yang Jiakuan
College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China E-mail:
Water Sci Technol. 2017 Sep;76(5-6):1112-1123. doi: 10.2166/wst.2017.297.
In this study, anaerobic granular sludge (AGS) was used as a novel adsorbent for hexavalent chromium (Cr (VI)) removal from aqueous solutions. Factor experiments were conducted to find out the effects of different variables on the biosorption process. Among these terms, the impact of three main independent variables (contact time, initial pH and AGS dosage) on the removal efficiency of Cr (VI) was modeled using a well-fitting polynomial equation (R = 0.9044), by conducting 20 batch experiments designed by a central composite. The experimental isotherm data were successfully described by the Freundlich isotherm and the pseudo-second-order kinetic model was more suitable for explaining the kinetics process of adsorption. The AGS can be disposed using 0.1 M NaOH with 96.4% desorption efficiency. The results of the analyses (X-ray photoelectron spectroscopy and Fourier transformed infrared spectroscopy) suggested that Cr (VI) adsorption most likely involved electrostatic adsorption, redox reaction and complexation.
在本研究中，厌氧颗粒污泥（AGS）被用作一种新型吸附剂，用于从水溶液中去除六价铬（Cr(VI)）。进行了因子实验以找出不同变量对生物吸附过程的影响。在这些因素中，通过进行由中心复合设计的20次批次实验，使用拟合良好的多项式方程（R = 0.9044）对三个主要自变量（接触时间、初始pH值和AGS用量）对Cr(VI)去除效率的影响进行了建模。实验等温线数据成功地用Freundlich等温线描述，并且准二级动力学模型更适合解释吸附的动力学过程。AGS可以用0.1 M NaOH处理，解吸效率为96.4%。分析结果（X射线光电子能谱和傅里叶变换红外光谱）表明，Cr(VI)吸附最可能涉及静电吸附、氧化还原反应和络合作用。
