生态与农村环境学报 ›› 2016, Vol. 32 ›› Issue (6): 986-991.doi: 10.11934/j.issn.1673-4831.2016.06.018

• 污染控制与修复 • 上一篇    下一篇

凹凸棒石和海泡石对镉离子的吸附效果

王荐1,2,3, 李仁英1, 何跃2,3, 吴运金2,3, 焦少俊2, 赵莉4   

  1. 1. 南京信息工程大学应用气象学院, 江苏 南京 210044;
    2. 环境保护部南京环境科学研究所, 江苏 南京 210042;
    3. 国家环境保护土壤环境管理与污染控制重点实验室, 江苏 南京 210042;
    4. 江苏永威环境建设股份有限公司, 江苏 南京 210000
  • 出版日期:2016-11-25 发布日期:2016-11-30
  • 通讯作者: 何跃,E-mail:heyue@nies.org E-mail:heyue@nies.org
  • 作者简介:王荐(1989-),男,江苏盐城人,硕士生,从事污染土壤修复药剂研发方面的研究。E-mail:237922153@qq.com
  • 基金资助:

    中央级公益性科研院所基本科研业务专项(2015038);中国科学院盱眙凹土应用技术研发与产业化中心开放性课题(201412,201506)

Effects of Attapulgite and Sepiolite Adsorbing Cadmium in Aqueous Solution

WANG Jian1,2,3, LI Ren-yin1, HE Yue2,3, WU Yun-jin2,3, JIAO Shao-jun2, ZHAO Li4   

  1. 1. College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China;
    3. State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China;
    4. Jiangsu Yongwei Foreverway Environment Construction Co. Ltd., Nanjing 210000, China
  • Online:2016-11-25 Published:2016-11-30

摘要:

采用静态批试验方法研究了凹凸棒石和海泡石对溶液中Cd2+的吸附特性,并通过考察一定离子强度下,不同初始浓度、固液比、吸附时间和pH值对吸附镉的影响。结果显示:在0.01 mol·L-1NaNO3离子强度下,高品位海泡石、凹凸棒石和低品位凹凸棒石对溶液中Cd2+的吸附量与初始浓度呈正比,与固液比呈反比;根据Langmuir等温吸附方程拟合结果,在给定离子强度25℃条件下黏土矿物Cd2+的理论饱和吸附量从大到小依次为高品位凹凸棒石(33.67 mg·g-1)、高品位海泡石(25.55 mg·g-1)、低品位凹凸棒石(11.52 mg·g-1)和低品位海泡石(5.24 mg·g-1);Cd2+在海泡石、凹凸棒石上的吸附受pH值的影响较大,在pH值为2~4时吸附效果最好;凹凸棒石对Cd2+的吸附较为稳定,在3 h时基本达到吸附平衡;在离子强度为0.01 mol·L-1 NaNO3、Cd2+初始浓度为625 mg·L-1、黏土矿物添加量为15 g·L-1和pH值为2~4时,去除效果从大到小依次为高品位海泡石、高品位凹凸棒石、低品位凹凸棒石和低品位海泡石。

关键词: 海泡石, 凹凸棒石, 吸附,

Abstract:

Effects of attapulgite and sepiolite adsorbing Cd2+ in aqueous solutions relative to initial concentration, solid-liquid ratio, exposure duration, and pH were investigated through a static batch experiment under a set NaNO3 ionic strength (0.01 mol·L-1). Results show that, under the set NaNO3 ionic strength, Cd2+ adsorption of sepiolite and attapulgite of high grade and attapulgite of low grade is positively related to initial concentration of Cd2+ in the solution, but negatively to solid-liquid ratio of the solution. Fitting with the Langmuir isothermal adsorption equation reveals an order of high grade attapulgite (33.67 mg·g-1) >high grade sepiolite (25.55 mg·g-1) >low grade attapulgite(11.52 mg·g-1) >low grade sepiolite (5.24 mg·g-1) in terms of theoretical saturated Cd2+adsorption; Cd2+ adsorption on sepiolite and attapulgite is strongly influenced by pH of the solution, and peaks when pH is 2-4; Cd2+ adsorption on attapulgite is relatively stable and reaches equilibrium basically in 3 h; in solutions 0.01 mol·L-1 NaNO3 in ionic strength, 625 mg·L-1 in initial Cd2+ concentration, 15 g·L-1 in clay mineral addition amount and 2-4 in pH, the minerals display an order of high grade sepiolite >high grade attapulgite >low grade attapulgite >low grade sepiolite in terms of Cd removal efficiency.

Key words: sepiolite, attapulgite, adsorption, cadmium

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