Separation of binary heavy metals from aqueous solutions by nanofiltration and characterization of the membrane using Spiegler-Kedem model
Separation of binary heavy metals from aqueous solutions by nanofiltration and characterization of the membrane using Spiegler-Kedem model
复制标题
DOI：
10.1016/j.cej.2008.12.023
复制
发表时间：
2009-07-15
影响因子：
15.1
通讯作者：
Chaudhari, Latesh B.
中科院分区：
文献类型：
--
作者：
Murthy, Z. V. R.;Chaudhari, Latesh B.
重金属是环境污染的重要来源，并且是不可降解的，因此继续存在于水中。膜技术是从废水中分离重金属而不产生任何污染负荷的一种选择。本文介绍了一种商业纳滤膜从水溶液中分离二元重金属（镉和镍）的能力。施加压力的影响。研究了料液浓度、料液流量、料液pH值和阴离子性质对镉、镍离子截留率的影响。观察到在恒定的进料流速下，截留率随着进料压力的增加而增加，并且随着进料浓度的增加而降低。当初始进料浓度为5 ppm时，镍和镉离子的最大溶质截留率分别为98.94%和82.69%。纳滤膜的特点是使用Spiegler-Kedem模型的基础上不可逆热力学耦合膜理论。边界层厚度，以及膜传输参数估计通过使用Levenberg-Marquardt方法。用估算的参数对膜性能进行了预测，发现预测值与实验结果吻合较好。(C)2008 Elsevier B. V.保留所有权利。
Heavy metals are important sources of environmental pollution and are non-degradable, and therefore, continue to exist in water. Membrane technology is one option for the separation of heavy metals from wastewater without generating any pollution load. This paper presents the binary heavy metals (cadmium and nickel) separation capability of a commercial nanofiltration membrane from aqueous solutions. The influence of applied pressure. feed solute concentration, feed flowrate, feed pH and nature of anion on the retention of cadmium and nickel ions is studied. it is observed that the rejection increases with increase in feed pressure and decreases with increase in feed concentration at constant feed flowrate. The maximum observed solute rejection of nickel and cadmium ions are 98.94% and 82.69%, respectively, for an initial feed concentration of 5 ppm. The NF membrane is characterized by using the Spiegler-Kedem model based on irreversible thermodynamics coupled with film theory. Boundary layer thicknesses, as well as the membrane transport parameters are estimated by using the Levenberg-Marquardt method. The estimated parameters are used to predict the membrane performance and found that the predicted values are in good agreement with the experimental results. (C) 2008 Elsevier B.V. All rights reserved.