...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Removal Efficiency and Binding Mechanisms of Copper and Copper-EDTA Complexes Using Polvethvleneimine
【24h】

Removal Efficiency and Binding Mechanisms of Copper and Copper-EDTA Complexes Using Polvethvleneimine

机译：聚乙烯醚亚胺对铜及铜-EDTA配合物的去除效率及结合机理

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Copper is used extensively in semiconductor circuits as the multilayer metal. In addition to copper, waste streams often contain chelating agents like EDTA, which is widely used in the process to enhance solubility of copper, and it tends to form copper-chelated complexes. PEI-agarose adsorbents in a packed-bed column are capable of removing these anionic complexes, but the competitive binding between this chelating agent 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 EDTA. The pH of the column is fixed at 5.5 using 0.1 M acetate buffer. The ratio of chelator to copper ions is varied. Copper binding capacity and copper breakthrough curves are compared and contrasted to results without additional chelator present. An excess of EDTA leads to an increase in the fraction of free dissociated (anionic) ligand that competes for electrostatic attraction on protonated amine groups and therefore leads to a decrease in sorption capacity in the column. However, this waste treatment technique is still feasible for the semiconductor industry as large volumes of copper-contaminated solutions from actual waste can be concentrated 12-fold. When equimolar (copper to EDTA) or higher concentrations of EDTA are present, acetate can be utilized to recover the metal; for low ratios of copper to EDTA, metal recovery is achieved using hydrochloric acid.
机译：铜在半导体电路中广泛用作多层金属。除铜外，废料流通常还包含螯合剂，如EDTA，它广泛用于提高铜的溶解度的过程中，并且容易形成铜螯合的络合物。填充床色谱柱中的PEI-琼脂糖吸附剂能够去除这些阴离子络合物，但这种螯合剂与PEI之间对铜的竞争性结合尚不十分清楚，需要探索。目前的工作着重研究在EDTA存在下PEI-琼脂糖吸附剂对铜的吸附作用。使用0.1 M乙酸盐缓冲液将色谱柱的pH固定在5.5。螯合剂与铜离子的比例是变化的。比较了铜的结合能力和铜的穿透曲线，并与没有其他螯合剂的结果进行了对比。过量的EDTA导致游离的离解（阴离子）配体的分数增加，该配体竞争质子化胺基团上的静电吸引，因此导致色谱柱的吸附能力下降。但是，这种废物处理技术对于半导体行业仍然是可行的，因为来自实际废物的大量铜污染溶液可以浓缩12倍。当存在等摩尔浓度（EDTA的铜）或更高浓度的EDTA时，可以利用乙酸盐回收金属。对于低的铜与EDTA比率，使用盐酸可实现金属回收。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号