...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology: ES&T >Influence of Electrostatics on the Oxidation Rates of Organic Compounds in Heterogeneous Fenton Systems
【24h】

Influence of Electrostatics on the Oxidation Rates of Organic Compounds in Heterogeneous Fenton Systems

机译：

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

Electrostatic effects influence the oxidation rates of charged dissolved organic compounds in systems where the hydroxyl radical(~centre dot OH)is produced by the iron oxide-catalyzed decomposition of hydrogen peroxide(H_O_2).Experiments were performed using goethite and the OH probes ~(14)C-labeled formic acid,2-chlorophenol(2-CP),and nitrobenzene.At pH 4 and an ionic strength of 0.01 M,formic acid(pK_a= 3.745)detected a steady-state concentration of centre dot OH(~centre dot OH_ss,calculated as a solution average)approximately 50 times higher than the two neutral probes did in the same systems,indicating significant enrichment of formate at the surface of the positively charged iron oxide where the ~centre dot OH is being produced.Increasing the pH and ionic strength decreased formic acid oxidation rates by factors consistent with predicted decreases in electrostatic effects.In the presence of high 2-CP concentrations,the~centre dot OH_ss measured by formic acid decreased with time,and goethite coagulation increased,due to loss of positive charge on the oxide surface as the oxidation products of 2-CP complexed surface Fe species.The~centre dot OH_ss detected by 2-CP did not change significantly,indicating that neither goethite coagulation nor surface complexation of 2-CP oxidation products interfered with the rate of ~centre dot OH generation;however,such an effect could have occurred in experiments using dissolved Fe instead of goethite.Model predictions of organic compound oxidation rates in mineral-catalyzed Fenton-like systems were improved by taking electrostatic effects into account.

著录项

  • 来源
    《Environmental Science & Technology: ES&T》 |2004年第12期|3425-3431|共7页
  • 作者

    Wai P.Kwan; Bettina M.Voelker;

  • 作者单位

    Department of Civil and Environmental Engineering,Massachusetts Institute of Technology,Room 48-419,Cambridge,Massachusetts 02139;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 环境化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
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