Cu2+对凤眼莲根系吸附四环素的影响及机理
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

X52

基金项目:

国家自然科学基金(31500436);江苏省农业科技创新基金(CX(16)1051)


Effects of Cu2+ on adsorption of tetracycline on roots of eichhornia crassipes
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 文章评论
    摘要:

    以凤眼莲根系为生物吸附材料,通过批吸附平衡实验,考察Cu2+共存条件下凤眼莲根系吸附四环素(tetracycline,TC)的动力学特性和吸附等温线,并结合傅里叶红外光谱(Fourier infrared spectroscopy,FTIR)和基团屏蔽技术分析Cu2+对凤眼莲根系吸附TC特征的影响及机理。结果表明:共吸附动力学和吸附热力学分别符合准二级动力学模型和Freundlich等温吸附模型。随着共存Cu2+浓度的增加,凤眼莲根系对TC的吸附量和去除率也逐渐增大。凤眼莲根系表面羧基、氨基经化学屏蔽后,对TC的吸附量均降低了20%~30%;结合FTIR技术确定Cu2+通过与凤眼莲根系表面的活性官能团(羟基、羧基和氨基以及芳环结构等)发生相互作用,在根系与TC之间形成架桥,从而促进了根系对TC的吸附。

    Abstract:

    Using eichhornia crassipes roots as biological adsorbent, kinetics and adsorption isotherms of tetracycline(TC)adsorbed on eichhornia crassipes root under copper coexistence were discussed through an adsorption equilibrium experiment. Combined with Fourier transform infrared spectroscopy(FTIR)and group shielding technology, the effect and mechanism of Cu2+ on the adsorption of TC on eichhornia crassipes roots was analysed. The results show that co-adsorption kinetics and adsorption thermodynamics accord with quasi two stage kinetic model and Freundlich isothermal adsorption model. The absorption capacity of TC on eichhornia crassipes roots increases with the increase of Cu2+ concentration. When the hydroxyl and amino groups on eichhornia crassipes roots were chemically shielded, the adsorption capacity of TC decreased by 20%~30%. Using FTIR technique, it was found that Cu2+ formed a bridge between roots and TC through its interaction with hydroxyl, carboxyl, amino, and aromatic structures. Thus, the adsorption of TC on eichhornia crassipes roots was promoted.

    参考文献
    相似文献
    引证文献
引用本文

汤贝贝,张振华,卢信,等. Cu2+对凤眼莲根系吸附四环素的影响及机理[J].水资源保护,2018,34(3):104-110.(TANG Beibei, ZHANG Zhenhua, LU Xin, et al. Effects of Cu2+ on adsorption of tetracycline on roots of eichhornia crassipes[J]. Water Resources Protection,2018,34(3):104-110.(in Chinese))

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2017-12-08
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2018-05-25
  • 出版日期: