Kocaeli University, Department of Environmental Engineering, Umuttepe Kampus, 41380 Kocaeli, Turkey.
J Colloid Interface Sci. 2011 Oct 15;362(2):615-24. doi: 10.1016/j.jcis.2011.06.072. Epub 2011 Jul 6.
The paper presents the results of the studies of UF-complexation process applied for the removal of Co(2+) ions from water solutions. As binding agents for cobalt ions, the PVA polymer (M(w)=10,000) and its sulfonated form, synthesized in the laboratory, have been used. The method of experimental design and response surface methodology have been employed to find out the optimal conditions for the complexation process and to evaluate the interaction between the input variables, i.e., initial cobalt concentration, pH and amount of the polymer used, expressed as a polymer/Co(2+) ratio r. The data collected by the designed experiments showed that sulfonation of polymer has improved significantly the binding ability of PVA. The optimal conditions of cobalt ions complexation established by response surface model for non-sulfonated PVA polymer have been found to be as follows: the initial concentration of Co(2+)=5.70 mg L(-1), the ratio between polymer and metal ions, r=8.58 and pH=5.93. The removal efficiency of Co(2+) in these conditions was 31.81%. For sulfonated PVA polymer, the optimal conditions determined are as follows: initial concentration of Co(2+)=10 mg L(-1), r=1.2 and pH=6.5. For these conditions, a removal efficiency of 99.98% has been determined. The experiments showed that Co(2+) removal ability of sulfonated PVA was much higher than its non-sulfonated precursor. Although the polymer concentrations used in the tests with sulfonated PVA were approximately ten times lower than the non-sulfonated one, the removal efficiency of cobalt ions was significantly higher.
本文介绍了 UF 络合工艺用于从水溶液中去除 Co(2+)离子的研究结果。作为钴离子的结合剂，使用了实验室合成的 PVA 聚合物（M(w)=10,000）及其磺化形式。采用实验设计和响应面法找出络合过程的最佳条件，并评估输入变量之间的相互作用，即初始钴浓度、pH 值和使用的聚合物量，用聚合物/Co(2+) 比 r 表示。通过设计实验收集的数据表明，聚合物的磺化显著提高了 PVA 的结合能力。通过响应面模型为非磺化 PVA 聚合物确定的钴离子络合的最佳条件如下：Co(2+)的初始浓度[Co(2+)]=5.70 mg L(-1)，聚合物与金属离子的比值 r=8.58，pH 值为 5.93。在这些条件下 Co(2+)的去除效率为 31.81%。对于磺化 PVA 聚合物，确定的最佳条件如下：[Co(2+)]初始浓度(0)=10 mg L(-1)，r=1.2，pH=6.5。在这些条件下，确定 Co(2+)的去除效率为 99.98%。实验表明，磺化 PVA 的 Co(2+)去除能力远高于其非磺化前体。尽管在使用磺化 PVA 的测试中使用的聚合物浓度大约是非磺化 PVA 的十倍，但 Co(2+)离子的去除效率显著更高。
