欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

β-FeOOH改性蒙脱土对模拟酸性矿山废水中铜离子的吸附

周华锋*,张肖肖,李响   

  1. (沈阳化工大学应用化学学院, 沈阳 110142)
  • 出版日期:2018-11-10 发布日期:2018-11-10

Adsorption of copper ions in acidic mine drainage by β-FeOOH modified montmorillonite.

ZHOU Hua-feng*, ZHANG Xiao-xiao, LI Xiang   

  1. (College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China).
  • Online:2018-11-10 Published:2018-11-10

摘要: 用β-羟基氧化铁对蒙脱土进行改性制备β羟基氧化铁改性蒙脱土(β-FeOOH-Mt)。用氮吸附程序升温脱附对β-FeOOH-Mt的结构进行了表征,并研究了β-FeOOH-Mt(3.5)对模拟酸性矿山废水中铜离子的吸附。结果发现:蒙脱土经改性后比表面积增加、孔容增大;β-FeOOH-Mt(3.5)对废水中Cu2+有很强的吸附能力。在初始浓度为5~25 mg·L-1范围内,β-FeOOH-Mt(3.5)用量为2~9 g·L-1,吸附20 min后Cu2+的浓度均低于0.5 mg·L-1。Langmuir等温方程能更好地描述吸附过程,吸附过程符合单分子吸附模型;动力学研究表明,吸附遵循拟二级吸附动力学方程,相关性很好。

关键词: 土壤水分运动, 土地利用变化, 氢氧稳定同位素, 黄土区

Abstract: In this study, β-FeOOH-Mt was prepared by montmorillonite modified with beta hdroxy iron oxide. N2TPD was used to identify the structure of β-FeOOH-Mt. The adsorption of copper ions in acidic mine drainage by β-FeOOH-Mt (3.5) was examined. It was found that the specific surface area and the pore volume of montmorillonite increased after modification. β-FeOOH-Mt (3.5) had strong adsorption capacity for Cu2+. When the initial concentration of Cu2+ was 5-25 mg·L-1, the application amount of β-FeOOH-Mt (3.5) was 2-9 g·L-1, and the concentration of Cu2+ was lower than 0.5 mg·L-1 after 20 min. The Langmuir isotherm model better fitted with the experimental data than Freundlich isotherm model. The adsorption process is in accordance with the single molecule adsorption model. The kinetic study showed that the adsorption followed the quasi second adsorption kinetic equation with a good correlation.

Key words: soil water movement, hydrogen and oxygen stable isotopes, loess area, land use change