Effects of pH, ionic strength and humic acid on the sorption of neptunium(V) to Na-bentonite

被引：25
|
作者：
Li, Ping [1 ]
Liu, Zhi [1 ]
Ma, Feng [2 ]
Shi, Quanlin [2 ]
Guo, Zhijun [1 ]
Wu, Wangsuo [1 ]
机构：
[1] Lanzhou Univ, Radiochem Lab, Lanzhou 730000, Peoples R China
[2] Northwest Inst Nucl Technol, Xian 710024, Peoples R China
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2015年 / 206卷
基金：
中国国家自然科学基金;
关键词：
Na-bentonite; Neptunium; Sorption; Humic acid; SCM; FULVIC-ACID; AQUEOUS-SOLUTION; MX-80; BENTONITE; METAL-IONS; TEMPERATURE; ADSORPTION; NP(V); ATTAPULGITE; TH(IV); MONTMORILLONITE;
D O I：
10.1016/j.molliq.2015.02.014
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Effects of ionic strength, pH, temperature, humic acid (HA) and adsorbate concentration on Np(V) sorption to Na-bentonite were investigated in detail. The sorption of Np(V) to Na-bentonite was significantly dependent on pH and independent of temperature. In the presence of HA, Np(V) sorption was enhanced significantly at low pH; while an obvious negative effect was observed in higher pH range. Np(V) sorption followed the Freundlich isotherm indicating a heterogeneous sorption of Np(V) on the surface of Na-bentonite. The surface complexation model (SCM) suggests that sorption of Np(V) on Na-bentonite was mainly dominated by ion exchange at low pH values, and two dominant monodentate inner-sphere complexes of SiONpO20 (logK = -4.55) and AlO(NpO2OH)(-) (log K = -13.80) contributed to Np(V) sorption on Na-bentonite over high pH range. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：285 / 292
页数：8
相关论文
共 50 条
  • [1] Sorption of Am(Ⅲ) on Na-bentonite:Effect of pH,ionic strength,temperature and humic acid
    Tao Yu~(a
    [J]. Chinese Chemical Letters, 2012, 23 (10) : 1189 - 1192
  • [2] Sorption of Am(III) on Na-bentonite: Effect of pH, ionic strength, temperature and humic acid
    Yu, Tao
    Wu, Wang Suo
    Fan, Qiao Hui
    [J]. CHINESE CHEMICAL LETTERS, 2012, 23 (10) : 1189 - 1192
  • [3] Sorption of Th(IV) on Na-bentonite: Effects of pH, ionic strength, humic substances and temperature
    Pan, Duo-qiang
    Fan, Qiao-hui
    Li, Ping
    Liu, Sheng-ping
    Wu, Wang-suo
    [J]. CHEMICAL ENGINEERING JOURNAL, 2011, 172 (2-3) : 898 - 905
  • [4] Effects of humic acid on the sorption of neptunium(V) on kaolinite
    Niitsu, Y
    Sato, S
    Ohashi, H
    Sakamoto, Y
    Nagao, S
    Ohnuki, T
    Muraoka, S
    [J]. JOURNAL OF NUCLEAR MATERIALS, 1997, 248 : 328 - 332
  • [5] Sorption of Ni(II) on GMZ bentonite: Effects of pH, ionic strength, foreign ions, humic acid and temperature
    Yang, Shitong
    Li, Jiaxing
    Lu, Yi
    Chen, Yixue
    Wang, Xiangke
    [J]. APPLIED RADIATION AND ISOTOPES, 2009, 67 (09) : 1600 - 1608
  • [6] Sorption of Eu (III) on Ca-bentonite: Effect of pH, Ionic Strength and Humic Acid
    Yu, T.
    Wu, W. S.
    Liu, Z. R.
    Zhang, S. W.
    [J]. RESEARCH JOURNAL OF CHEMISTRY AND ENVIRONMENT, 2012, 16 (03): : 4 - 10
  • [7] Sorption of cyromazine on humic acid: Effects of pH, ionic strength and foreign ions
    Zhao, Ling
    Lin, Zhi-rong
    Dong, Yuan-hua
    [J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2014, 21 (04) : 2688 - 2696
  • [8] Sorption of cyromazine on humic acid: Effects of pH, ionic strength and foreign ions
    Ling Zhao
    Zhi-rong Lin
    Yuan-hua Dong
    [J]. Environmental Science and Pollution Research, 2014, 21 : 2688 - 2696
  • [9] pH, Ionic Strength, and Ion Competition Effect on Cu(II) and Ni(II) Sorption by a Na-bentonite Used as Liner Material
    Belen Musso, Telma
    Eugenia Parolo, Maria
    Pettinari, Gisela
    [J]. POLISH JOURNAL OF ENVIRONMENTAL STUDIES, 2019, 28 (04): : 2299 - 2309
  • [10] Sorption of Np(V) and Np(IV) onto kaolinite: Effects of pH, ionic strength, carbonate and humic acid
    Schmeide, Katja
    Bernhard, Gert
    [J]. APPLIED GEOCHEMISTRY, 2010, 25 (08) : 1238 - 1247
12345