Kinetic and equilibrium studies of lead(II) adsorption from aqueous media by KIT-6 mesoporous silica functionalized with -COOH

被引:32
作者
Bensacia, Nabila [1 ,2 ]
Fechete, Ioana [1 ]
Moulay, Saad [2 ]
Hulea, Oana [1 ]
Boos, Anne [3 ]
Garin, Francois [1 ]
机构
[1] Univ Strasbourg, UMR CNRS 7515, Inst Chim & Procedes Energie Environm & Sante, F-67087 Strasbourg 2, France
[2] Univ Saad Dahlab Blida, Fac Engn Sci, Dept Chim Ind, Lab Chim Phys Mol & Macromol, Blida 09000, Algeria
[3] Univ Strasbourg, UMR CNRS 7178, Inst Pluridisciplinaire Hubert Curien, F-67087 Strasbourg 2, France
关键词
Kinetic studies; Adsorption; Lead(II); COOH/KIT-6; HEAVY-METAL IONS; WASTE-WATER; COIR PITH; REMOVAL; SBA-15; CONVERSION; PB(II); CONDENSATION; PERFORMANCE; CATALYSTS;
D O I
10.1016/j.crci.2014.03.007
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An organic-inorganic hybrid mesoporous silica was synthesized via post-grafting of KIT-6 with 4-(triethoxysilyl)butyronitrile. All samples were characterized using their N-2 adsorption-desorption isotherms, XRD, FT-IR, TEM, SEM, and PT. The adsorption potential of this material for removing Pb(II) from aqueous solutions was investigated via the batch technique, and the effects of pH and contact time were studied. Experimental data showed that the maximum Pb(II) adsorption, 76%, occurred in the pH range around 6. The adsorption equilibrium was reached within 40 min for 10 wt.%COOH/KIT-6. The adsorption data were fitted using the Langmuir and Freundlich isotherms, and the obtained modeling equilibrium adsorption data suggested that the 10 wt.%COOH/KIT-6 sample contained homogeneous adsorption sites that fit the Langmuir adsorption model well. The pseudo-second-order model described well the 10 wt.%COOH/KIT-6 adsorption process. The desorption and regeneration experiments indicated that approximate to 95% of the metal desorbed and the adsorbent could be regenerated via an acid treatment without altering its properties. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
引用
收藏
页码:869 / 880
页数:12
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