Amino-functionalized MCM-41 and MCM-48 for the removal of chromate and arsenate

被引：74
作者：
Benhamou, A. [1 ,2 ]
Basly, J. P. [2 ]
Baudu, M. [2 ]
Derriche, Z. [1 ]
Hamacha, R. [3 ]
机构：
[1] Univ Sci & Tech M Boudiaf, Fac Sci, Dept Chim, Oran El Mnaouer, Algeria
[2] Univ Limoges, Fac Sci, EA GRESE 4330, F-87050 Limoges, France
[3] Univ Oran, Lab Chim Mat, Oran El Mnaouer, Algeria
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2013年 / 404卷
关键词：
MCM-41; MCM-48; Amine; Expansion; Chromate; Arsenate; Adsorption; MESOPOROUS MOLECULAR-SIEVES; HEXAVALENT CHROMIUM; ADSORPTION; WATER; ADSORBENTS; SPECIATION; OXYANIONS; TOXICITY; CHITOSAN; SORPTION;
D O I：
10.1016/j.jcis.2013.04.026
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：
The aim of the present work was to investigate the efficiency of three amino-functionalized (hexadecylamine, dodecylamine, and dimethyldodecylamine) mesoporous silicas (MCM-41 and MCM-48) toward the adsorption of arsenate and chromate. Hexadecylamine-functionalized materials were characterized; BET surface areas, pore volumes, and sizes decreased with the functionalization, whereas XRD patterns show that the hexagonal structure of MCM-41 and the cubic structure of MCM-48 were not modified. The zeta potential decreases with pH and the highest arsenate and chromate removal was observed at the lowest pHs. Adsorption of chromium and arsenate was significantly enhanced after functionalization and amino-functionalized MCM-41 adsorb larger amounts of arsenate when compared to expanded MCM-48 materials. Chromate sorption capacities increased with the chain length and the larger capacities were obtained with hexadecylamine-functionalized mesoporous silicas. Mesoporous silicas modified by dimethyldodecylamine exhibited the higher arsenate sorption capacities. (c) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码：135 / 139
页数：5
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