高级搜索

磁性海泡石表面零电荷点和吸附Cd2+的特性

,  ,  ,  , 

downloadPDF

上一篇

下一篇

王未平, 戴友芝, 贾明畅, 李小娜, 杜婷. 磁性海泡石表面零电荷点和吸附Cd2+的特性[J]. 环境化学, 2012, 31(11): 1691-1696.
引用本文: 王未平, 戴友芝, 贾明畅, 李小娜, 杜婷. 磁性海泡石表面零电荷点和吸附Cd2+的特性[J]. 环境化学, 2012, 31(11): 1691-1696.
shu
WANG Weiping, DAI Youzhi, JIA Mingchang, LI Xiaona, DU Ting. Surface point of zero charge of magnetic sepiolite and adsorption characteristics of cadmium[J]. Environmental Chemistry, 2012, 31(11): 1691-1696.
Citation: WANG Weiping, DAI Youzhi, JIA Mingchang, LI Xiaona, DU Ting. Surface point of zero charge of magnetic sepiolite and adsorption characteristics of cadmium[J]. Environmental Chemistry, 2012, 31(11): 1691-1696.
shu

磁性海泡石表面零电荷点和吸附Cd2+的特性

  • 1.

    湘潭大学环境科学与工程系, 重金属污染控制湖南省普通高等学校重点实验室, 湘潭, 411105;

  • 2.

    承德石油高等专科学校, 承德, 067000

  • 基金项目:

    水体污染控制与治理科技重大专项(2010ZX07212-008)

    湖南省科学技术厅科技计划重点项目(2011SK2016)资助.

Surface point of zero charge of magnetic sepiolite and adsorption characteristics of cadmium

  • 1.

    Department of Environmental Science and Engineering, Key Laboratory of Heavy Metal Pollution Control, Xiangtan University, Xiangtan, 411105, China;

  • 2.

    Chende Petroleum College, Chengde, 067000, China

  • Fund Project:

  • 摘要: 采用惰性电解质滴定法和静态吸附实验,研究了磁性海泡石表面零电荷点和吸附Cd2+特性.实验结果表明,海泡石经过磁改性后所对应的pHpzc值由8.0升高到8.5,吸附体系pH的提高,有利于对重金属阳离子Cd2+的吸附.在pH值大于3时,磁性海泡石对Cd2+吸附量和去除率随pH值的升高而增大且趋于稳定,其吸附量为16.10 mg·g-1,约为海泡石的3.9倍,去除率为98%,约为海泡石的2.2倍.磁性海泡石对Cd2+的吸附量与离子强度有较大的相关性,随离子强度的增加而减小;对Cd2+的吸附量随反应温度的升高而增加,吸附等温式符合Langmuir方程.吸附机理以表面配合吸附和表面沉淀为主.
    Abstract: Surface point of zero charge of magnetic sepiolite and adsorption characteristics of Cd2+ onto magnetic sepiolite were studied through inert electrolyte titration and static adsorption experiment. Results showed that the point of zero charge pHpzc increased from 8.0 to 8.5 after magnetically modified. The high pH value of adsorption system contributed to adsorption of heavy metal cation Cd2+ onto magnetic sepiolite. When the pH value was above 3, the adsorbed amount of Cd2+ and the removal rate of Cd2+ for magnetic sepiolite increased and tended to be stable with the pH increasing. The maximum adsorption capacity was 16.10 mg穏-1 Cd2+ for magnetic sepiolite, which is about 3.9 times of sepiolite. The removal rate of Cd2+ was 98% for magnetic sepiolite, which is about 2.2 times of sepiolite. The adsorbed amount of Cd2+ onto magnetic sepiolite has a great relevance with ionic strength, decreasing with increasing of ionic strength. The adsorbed amount increased with reaction temperature. Langmuir isotherm model was applied to describe the adsorption of Cd2+ onto magnetic sepiolite with a good fitness. Surface complexation and surface precipitation played the most importance role in adsorption mechanism of Cd2+ onto magnetic sepiolite.
  • 加载中
  • [1] Lazarević S, Janković-Častvan I, Jovanović D, et al. Adsorption of Pb2+, Cd2+and Sr2+ions onto natural and acid-activated sepiolites [J]. Applied Clay Science, 2007, 37(1):47-57
    [2] Ye X S, Wu Z J, Kim T, et al. Kinetics and thermodynamics of bromophenol blue adsorption by a mesoporous hybrid gel derived from tetrathoxysilane and bis(trimethoxysilyl) hexane [J]. Journal of Colloid and Interface Science, 2006, 300(2):526-535
    [3] Wu Z J, Xiang H, Kim T, et al. Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane[J]. Journal of Colloid and Interface Science, 2006, 304(1):119-124
    [4] Wu Z J, Joo H, Lee K. Kinetics and thermodynamics of the organic dye adsorption on the mesoporous hybrid xerogel[J]. Chemical Engineering Journal,2005,112(1/3):227-236
    [5] Wu Z J, Ahn I S, Lin Y X, et al. Methyl orange adsorption by microporous and mesoporous TiO2-SiO2, TiO2-SiO2-Al2O3 composite xerogels[J]. Composite Interface, 2004, 11(2): 205-212
    [6] Doğan M, Türkyilmaz A, Alkan M, et al. Adsorption of copper(Ⅱ) ions onto sepiolite and electrokinetic properties[J]. Desalination, 2009, 238(1):257-270
    [7] Lützenkirchen J. Ionic strength effects on cation sorption to oxides: macroscopic observations and their significance in microscopic interpretation[J]. Journal of Colloid and Interface Science, 1997, 195(1):149-155
    [8] Wu Z J, Wu J H, Xiang H, et al. Organosilane-functionalized Fe3O4 composite particles as effective magnetic assisted adsorbents[J]. Colloid Surfaces A, 2006, 279(1/3):167-174
    [9]
    [10] 贾明畅,戴友芝,杜婷,等. 磁性海泡石的研制及吸附Cr(Ⅵ)特性[J].环境化学,2011,30 (9): 1546-1552
    [11] Davis T A. Colloid and Interaction [J].Science,1984, 67: 226-242
    [12] 黄文飞.复合污染体系中,重金属和有机物在沉积物上的吸附行为.浙江:浙江大学硕士学位论文,2007:5-6
    [13] 徐应明,梁学峰,孙国红,等.酸和热处理对海泡石结构及吸附Pb2+、Cd2+性能的影响[J].环境科学,2010,31(6):1560-1567
    [14] 谢绍俊,何湘柱,舒绪刚,等.纳米ZrO2在液相中分散的研究进展[J].材料导报,2008,22-Ⅶ:15-18
    [15] Meena A K, Mishra G K, Rai P K, et al. Removal of heavy metal ions from aqueous solutions using carbon aerogel as an adsorbent[J]. Journal of Hazardous Materials,2005,122(1-2):161-170
  • 加载中
WeChat 点击查看大图
计量
  • 文章访问数:  954
  • HTML全文浏览数:  890
  • PDF下载数:  1027
  • 施引文献:  0
出版历程
  • 收稿日期:  2012-01-31
王未平, 戴友芝, 贾明畅, 李小娜, 杜婷. 磁性海泡石表面零电荷点和吸附Cd2+的特性[J]. 环境化学, 2012, 31(11): 1691-1696.
引用本文: 王未平, 戴友芝, 贾明畅, 李小娜, 杜婷. 磁性海泡石表面零电荷点和吸附Cd2+的特性[J]. 环境化学, 2012, 31(11): 1691-1696.
shu
WANG Weiping, DAI Youzhi, JIA Mingchang, LI Xiaona, DU Ting. Surface point of zero charge of magnetic sepiolite and adsorption characteristics of cadmium[J]. Environmental Chemistry, 2012, 31(11): 1691-1696.
Citation: WANG Weiping, DAI Youzhi, JIA Mingchang, LI Xiaona, DU Ting. Surface point of zero charge of magnetic sepiolite and adsorption characteristics of cadmium[J]. Environmental Chemistry, 2012, 31(11): 1691-1696.
shu

磁性海泡石表面零电荷点和吸附Cd2+的特性

  • 1.  湘潭大学环境科学与工程系, 重金属污染控制湖南省普通高等学校重点实验室, 湘潭, 411105;
  • 2.  承德石油高等专科学校, 承德, 067000
  • 收稿日期:  2012-01-31
基金项目:

水体污染控制与治理科技重大专项(2010ZX07212-008)

湖南省科学技术厅科技计划重点项目(2011SK2016)资助.

摘要: 采用惰性电解质滴定法和静态吸附实验,研究了磁性海泡石表面零电荷点和吸附Cd2+特性.实验结果表明,海泡石经过磁改性后所对应的pHpzc值由8.0升高到8.5,吸附体系pH的提高,有利于对重金属阳离子Cd2+的吸附.在pH值大于3时,磁性海泡石对Cd2+吸附量和去除率随pH值的升高而增大且趋于稳定,其吸附量为16.10 mg·g-1,约为海泡石的3.9倍,去除率为98%,约为海泡石的2.2倍.磁性海泡石对Cd2+的吸附量与离子强度有较大的相关性,随离子强度的增加而减小;对Cd2+的吸附量随反应温度的升高而增加,吸附等温式符合Langmuir方程.吸附机理以表面配合吸附和表面沉淀为主.

English Abstract

    全文HTML

参考文献 (15)

返回顶部

目录

/

返回文章
返回

Copyright © 2019 中国科学院生态环境研究中心