吉林大学学报(理学版)

• 环境科学 • 上一篇    

磁铁矿增强土壤吸附典型雌激素的热力学规律

周长志, 张琛, 刘建林, 李鱼   

  1. 华北电力大学 资源与环境研究院, 区域能源系统优化教育部重点实验室, 北京 102206
  • 收稿日期:2013-07-11 出版日期:2014-03-26 发布日期:2014-03-20
  • 通讯作者: 李鱼 E-mail:liyuxx@jlu.edu.cn

Adsorption Thermodynamics and Mechanism of Typical EndocrineDisrupting Compounds onto MagnetiteImmobilized Soil

ZHOU Changzhi, ZHANG Chen, LIU Jianlin, LI Yu   

  1. Resources and Environmental Research Academy, MOE Key Laboratory of Regional Energy Systems Optimization, North China Electric Power University, Beijing 102206, China
  • Received:2013-07-11 Online:2014-03-26 Published:2014-03-20
  • Contact: LI Yu E-mail:liyuxx@jlu.edu.cn

摘要:

通过考察掺杂0.5%,5%,15%和30%磁铁矿的土壤吸附雌激素(雌酮(E1)、 雌二醇(E2)、 雌三醇(E3)、 17-α-乙炔基雌二醇(EE2)和双酚A
(BPA))的热力学规律, 探讨磁铁矿存在条件下雌激素在水和土壤中的迁移规律, 通过对比吸附前后磁铁矿土壤的红外光谱分析其吸附机理, 并利用红外光谱对雌激素的增强吸附机理进行定性分析. 结果表明: 雌激素吸附的热力学规律符合Langmuir等温式, 雌激素吸附是分配作用和表面吸附共同作用的结果; 土壤对雌激素的吸附能力随磁铁矿掺杂比例的升高而增强; 掺杂0.5%磁铁矿的土壤对E2和BPA的去除率显著提高; 掺杂磁铁矿的土壤对E2具有显著的吸持效果; 在吸附过程中掺杂磁铁矿的土壤和雌激素之间, 以及雌激素相互之间的氢键作用是雌激素增强吸附的主要因素.

关键词: 雌激素化合物, 磁铁矿, 土壤, 吸持/固定化, 红外光谱

Abstract:

he mechanism of EDCs adsorption enhanced by magnetite spiked in soils (the magnetiteimmobilized soils) was qualitatively analyzed by FTIR. The results indicate that the thermodynamic process conforms with Langmuir isotherm very well, and the adsorption of EDCs onto the magnetiteimmobilized soils was the result of both surface adsorption and distribution. With the increase of the doping ratio of magnetite, the adsorption capacity of the magnetitesoil for EDCs was increased. The removal rate of E2 and BPA suggested  that magnetite spiked had a significant enhancement for adsorption and removal
of EDCs. After twice desorption, the desorption rate of E2 and  BPA showed the magnetiteimmobilized soils had a good retention capacity for E2. It was found from the FTIR profile that the appearance of hydrogen bonds between the magnetiteimmobilized soils on the one hand and EDCs on the other, and EDCs molecule themselves was one of the most important factors affecting the EDCs adsorption.

Key words: endocrine disrupting compounds, magnetite, soil, retention/mobilization, infrared spectroscopy

中图分类号: 

  • X132