Maketon W, Ogden K L
Department of Chemical and Environmental Engineering, University of Arizona, Tucson, 85721, United States.
Chemosphere. 2009 Apr;75(2):206-11. doi: 10.1016/j.chemosphere.2008.12.005. Epub 2009 Jan 14.
Citric acid and copper are often found in the waste streams from semiconductor manufacturing. They are likely to form complexes, which modify copper speciation. This can lead to changes in sorption mechanisms and the sorption capacity. PEI-agarose adsorbents in a packed bed column are capable of removing these anionic complexes, but the competitive binding between these organic ligands and PEI for copper is not well understood and needs to be explored. The current work focuses on investigating copper sorption by PEI-agarose adsorbent in the presence of citrate ions. Copper binding capacity and copper breakthrough curves are compared and contrasted to results without additional chelator present. The presence of citric acid at the molar ratios of 0.5, 1, and 2 to copper enhances the total copper uptake in a continuous column by 175%, 100% and 75%, respectively. This is a great advantage when wastewater streams contain either low or high amounts of citric acid ligand.
柠檬酸和铜经常出现在半导体制造的废物流中。它们很可能形成络合物，从而改变铜的形态。这可能导致吸附机制和吸附容量发生变化。填充床柱中的聚乙烯亚胺 - 琼脂糖吸附剂能够去除这些阴离子络合物，但这些有机配体与聚乙烯亚胺对铜的竞争结合尚未得到充分理解，需要进行探索。目前的工作重点是研究在柠檬酸根离子存在下聚乙烯亚胺 - 琼脂糖吸附剂对铜的吸附情况。将铜结合容量和铜穿透曲线与不存在额外螯合剂时的结果进行比较和对比。柠檬酸与铜的摩尔比为0.5、1和2时，连续柱中总铜吸收量分别提高了175%、100%和75%。当废水流中含有少量或大量柠檬酸配体时，这是一个很大的优势。
