• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Single and co-adsorption of heavy metals and humic acid on fly ash
【24h】

Single and co-adsorption of heavy metals and humic acid on fly ash

机译：粉煤灰中重金属和腐殖酸的单一吸附和共吸附

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

Heavy metals and humic acid are two important pollutants in surface and waste water systems.In this study,fly ash,an industrial waste,is used as a low-cost adsorbent for simultaneous removal of heavy metals and humic acid.The investigations were conducted for individual pollutant adsorption along with co-adsorption of both pollutants.It is found that,for single pollutant system,fly ash can achieve adsorption of lead ion at 18 mg/g,copper ion at 7 mg/g and humic acid at 36mg/g,respectively.For co-adsorption,complexation of heavy metals and humic acid plays an important role.The presence of humic acid in water will provide additional binding sites for heavy metals,thus promoting metal adsorption on fly ash.For Pb-HA and Cu-HA systems,Pb~(2+)and Cu~(2+)adsorption can increase to 37 and 28 mg/g,respectively,at pH 5 and 30 °C.However,the heavy metal ions present in the system will compete with the adsorption of humic acid on fly ash,thus resulting in a decrease in humic acid adsorption.For all cases,dynamic adsorption can be described by the first-order and second-order kinetics.
机译：重金属和腐殖酸是地表和废水系统中的两种重要污染物。在这项研究中，粉煤灰（一种工业废料）被用作低成本吸附剂，用于同时去除重金属和腐殖酸。研究发现，对于单一污染物系统，粉煤灰可实现18 mg / g的铅离子，7 mg / g的铜离子和36mg / g的腐殖酸的吸附。对于共吸附，重金属与腐殖酸的络合起着重要的作用。腐殖酸在水中的存在将为重金属提供额外的结合位点，从而促进金属在粉煤灰上的吸附。对于Pb-HA和Cu -HA体系中，在pH 5和30°C下，Pb〜（2+）和Cu〜（2+）的吸附量分别增加至37和28 mg / g。但是，系统中存在的重金属离子会竞争随着腐殖酸在粉煤灰上的吸附，从而导致腐殖酸的吸附减少。在所有情况下，动态吸附都可以由一级和二级动力学来描述。

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