...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Enhanced Solubilization Of A Metal-organic Contaminant Mixture (pb, Sr, Zn, And Perchloroethylene) By Cyclodextrin
【24h】

Enhanced Solubilization Of A Metal-organic Contaminant Mixture (pb, Sr, Zn, And Perchloroethylene) By Cyclodextrin

机译：环糊精增强金属有机污染物混合物（pb，Sr，Zn和全氯乙烯）的增溶作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Prior work has suggested that (carboxymethyl)-β-cyclodextrin (CMCD) is capable of simultaneously enhancing the solubility of organics and metals, but sparse experimental data and no theoretical models have been published on this process. Preciously, a geochemical model for metal complexation by CMCD was formulated using PHREEQC on the basis of conditional stability constants measured in experiments using single-metal salts. In this study, the model is expanded to simultaneous metal and organic (perchloroethylene, PCE) complexation by CMCD. Experiments to verify the application of the formulation to mixed-waste systems were performed using solutions containing multiple metal ions (Pb, Sr, and Zn) and in a separate experiment introducing PCE with multiple metal ions. These experimental results show simultaneous solubility enhancement of metals and PCE. For solutions up to about 50 g/L CMCD, the model accurately predicted the simultaneous solubility enhancement for PCE, Pb, and Zn, while the difference between the measured and predicted Sr concentrations was accurate to within 15%. At CMCD concentrations greater than 50 g/L, the observed metal solubilities were greater than predicted (10% for Pb and Zn), probably due to the difficulty in accurately representing the activity and the effect on the ionic strength of functional groups on large organic molecules at higher concentrations.
机译：先前的工作表明，（羧甲基）-β-环糊精（CMCD）能够同时提高有机物和金属的溶解度，但是稀疏的实验数据并且尚未发表有关该过程的理论模型。稀有的是，根据PHREEQC在单金属盐实验中测得的条件稳定性常数的基础上，建立了CMCD进行金属络合的地球化学模型。在这项研究中，该模型扩展为通过CMCD同时进行金属和有机（全氯乙烯，PCE）络合。使用含有多种金属离子（Pb，Sr和Zn）的溶液，以及在引入含有多种金属离子的PCE的单独实验中，进行了验证配方在混合废料系统中的应用的实验。这些实验结果表明金属和PCE的溶解度同时提高。对于高达约50 g / L CMCD的溶液，该模型可准确预测PCE，Pb和Zn的同时溶解度提高，而测得的Sr浓度与预测的Sr浓度之间的差则精确到15％以内。在CMCD浓度大于50 g / L时，观察到的金属溶解度大于预期（对于Pb和Zn为10％），这可能是由于难以准确表示活性以及对大型有机物上官能团的离子强度的影响浓度较高的分子。

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