...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Geochemistry >Effect of Microbial Siderophore DFOB on Pb, Zn, and Cd Sorption Onto Zeolite
【24h】

Effect of Microbial Siderophore DFOB on Pb, Zn, and Cd Sorption Onto Zeolite

机译：微生物铁载体DFOB对Pb，Zn和Cd吸附沸石的影响

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

Recent studies suggest that siderophores form stable complexes with divalent metals and affect their mobility. In this work, effects of trihydroxamate microbial siderophores and desferrioxamine-B (DFOB) on Pb(II), Zn(II), and Cd(II) sorption by two kinds of synthesized zeolites (13X and Na–Y) as a function of pH were investigated. Results showed that 13X zeolite has a higher sorption affinity for studied metals than Na–Y. DFOB strongly affected metal sorption on both zeolites. Under slightly acidic to neutral condition, DFOB increased the metal sorption on zeolites due to the sorption of positively charged heavy metal–DFOB complexes. Whereas by increasing pH (>7), the mobilizing effect of DFOB was observed for Pb, Zn, and Cd. DFOB drastically decreased (80 %) Zn sorption in alkaline condition. As a result, siderophores can weaken the treatment efficiency of zeolites and increase the bioavailability of metals in soils. Surface complexation modeling revealed that the effects of DFOB on metal sorption by 13X and Na–Y zeolites can be explained by the differences in their surface charge. In general, the result shows the influence of DFOB on metal sorption by zeolites over the pH range 4–9 and decreasing in the sequence Zn > Pb > Cd.
机译：最近的研究表明，铁载体与二价金属形成稳定的络合物并影响其迁移率。在这项工作中，三羟肟酸酯微生物铁载体和去铁草胺B（DFOB）对两种合成沸石（13X和Na–Y）吸附Pb（II），Zn（II）和Cd（II）的作用是研究pH值。结果表明13X沸石对被研究金属的吸附亲和力比Na-Y高。 DFOB强烈影响两种沸石上的金属吸附。在微酸性至中性条件下，由于带正电的重金属-DFOB络合物的吸附，DFOB增强了沸石对金属的吸附。而通过增加pH（> 7），可以观察到DFOB对Pb，Zn和Cd的迁移作用。在碱性条件下，DFOB大大降低（80％）锌吸附。结果，铁载体会削弱沸石的处理效率并增加土壤中金属的生物利用度。表面络合模型表明，DFOB对13X和Na-Y沸石金属吸附的影响可以通过其表面电荷的差异来解释。总的来说，该结果表明DFOB在4-9的pH范围内对沸石对金属吸附的影响，并依次降低Zn> Pb> Cd。

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