Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain.
J Environ Manage. 2013 Feb 15;116:181-5. doi: 10.1016/j.jenvman.2012.11.041. Epub 2013 Jan 9.
This work is focused on the study of the electrodeposition stage of a combined polymer-supported ultrafiltration (PSU)-electrodeposition process for the recovery and selective separation of Cu/Zn mixtures. With this aim, the electrodeposition of Cu/Zn mixtures was evaluated in the presence of ethoxylated polyethylenimine, a polymer that has exhibited good performance in PSU processes in previous studies and whose performance has been fully characterised in the literature. It was determined that at pH values equal to or less than 4, macromolecular complexes formed with both Cu and Zn are weak and electrodeposition can take place very efficiently, with the deposition of copper being strongly favoured. For values of the applied electrical charge equal or greater than 0.1 A h dm(-3), the purity of the copper deposit is greater than 99% for the range of Cu/Zn molar ratios between 1 and infinity. Next, long-term experiments in continuous mode showed that the average deposition rate was close to the maximum rate achieved when operating in discontinuous mode and that the electrodeposition process does not negatively affect the performance of the polymer in the PSU processes.
这项工作专注于研究复合聚合物支撑超滤（PSU）-电沉积工艺的电沉积阶段，该工艺用于回收和选择性分离 Cu/Zn 混合物。为此，在乙氧基化聚乙烯亚胺存在下评估了 Cu/Zn 混合物的电沉积，乙氧基化聚乙烯亚胺是一种聚合物，在之前的 PSU 工艺研究中表现出良好的性能，其性能在文献中得到了充分的描述。结果表明，在 pH 值等于或小于 4 时，与 Cu 和 Zn 形成的高分子配合物较弱，电沉积可以非常有效地进行，铜的沉积得到强烈促进。对于施加的电荷量等于或大于 0.1 A h dm(-3)的情况，对于 1 至无穷大范围内的 Cu/Zn 摩尔比，铜沉积物的纯度大于 99%。接下来，连续模式下的长期实验表明，平均沉积速率接近在不连续模式下操作时达到的最大速率，并且电沉积过程不会对 PSU 过程中聚合物的性能产生负面影响。
