Nature of ammonium ion adsorption by sepiolite: analysis of equilibrium data with several isotherms

被引:77
作者
Balci, S [1 ]
机构
[1] Gazi Univ, Dept Chem Engn, Fac Engn & Architecture, TR-06570 Ankara, Turkey
关键词
ammonium removal; sepiolite; adsorption isotherm;
D O I
10.1016/j.watres.2003.12.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Adsorption isotherms for an ammonium ion-sepiolite system have been established for initial ammonium ion solution concentrations in the range of 8.32-388.06 mmol NH4+ /L (150-7000 ppm). The change of the "g sepiolite/mL solution" ratios from 1/10 to 1/70 caused an increase in the adsorption from 1.82 to 3.70 mmol NH4+ /g for the average particle size of 2.8 mm. The equilibrium data were fitted to "general-purpose isotherms" and "first-order adsorption model", and the adjustable parameters of the isotherms were estimated by nonlinear least-squares analysis. Langmuir and Freundlich models were found insufficient to explain the adsorption equilibrium, while Langmuir Freundlich and Tooth isotherms explained the data well. Goodness of fit increased with the increased sepiolite quantity in the treated suspension. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1129 / 1138
页数:10
相关论文
共 31 条
[1]   Use of general purpose adsorption isotherms for heavy metal clay mineral interactions [J].
Altin, O ;
Ozbelge, HO ;
Dogu, T .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1998, 198 (01) :130-140
[2]  
[Anonymous], REV MINERAL
[3]   Ammonium ion adsorption with sepiolite:: use of transient uptake method [J].
Balci, S ;
Dinçel, Y .
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 2002, 41 (01) :79-85
[4]   Effect of heating and acid pre-treatment on pore size distribution of sepiolite [J].
Balci, S .
CLAY MINERALS, 1999, 34 (04) :647-655
[5]  
Balci S, 1996, J CHEM TECHNOL BIOT, V66, P72, DOI 10.1002/(SICI)1097-4660(199605)66:1<72::AID-JCTB442>3.0.CO
[6]  
2-T
[7]   NATURAL ZEOLITES AND SEPIOLITE AS AMMONIUM AND AMMONIA ADSORBENT MATERIALS [J].
BERNAL, MP ;
LOPEZREAL, JM .
BIORESOURCE TECHNOLOGY, 1993, 43 (01) :27-33
[8]   Kinetics of heavy-metal removal and recovery in sepiolite [J].
Brigatti, MF ;
Lugli, C ;
Poppi, L .
APPLIED CLAY SCIENCE, 2000, 16 (1-2) :45-57
[9]  
BRINDLEY GW, 1980, ORDER DISORDER CLAY, P104
[10]   Heavy metal adsorption by functionalized clays [J].
Celis, R ;
Hermosín, MC ;
Cornejo, J .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (21) :4593-4599