Université des Sciences et TechniquesM. Boudiaf, Faculté des Sciences, Département de Chimie, Oran El M'Naouer, Algeria.
J Colloid Interface Sci. 2013 Aug 15;404:135-9. doi: 10.1016/j.jcis.2013.04.026. Epub 2013 Apr 30.
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.
本工作旨在研究三种氨基功能化介孔硅材料（十六胺、十二胺和二甲基十二胺）对砷酸盐和铬酸盐的吸附效率。对十六胺功能化材料进行了表征；BET 表面积、孔体积和尺寸随着功能化而降低，而 XRD 图谱表明 MCM-41 的六方结构和 MCM-48 的立方结构没有被修饰。Zeta 电位随 pH 值而降低，在最低 pH 值下观察到砷酸盐和铬酸盐的去除率最高。功能化后，铬和砷酸盐的吸附显著增强，与膨胀的 MCM-48 材料相比，氨基功能化的 MCM-41 吸附了更多的砷酸盐。铬酸盐的吸附容量随链长的增加而增加，并且用十六胺功能化的介孔硅获得了更大的容量。用二甲基十二胺修饰的介孔硅表现出更高的砷酸盐吸附容量。
