Adsorption of chromium(VI) from an aqueous solution on a surfactant-modified zeolite

被引：212

作者：

Leyva-Ramos, R. ^{[1
]}

Jacobo-Azuara, A. ^{[1
]}

Diaz-Flores, R. E. ^{[1
]}

Guerrero-Coronado, R. M. ^{[1
]}

Mendoza-Barron, J. ^{[1
]}

Berber-Mendoza, M. S. ^{[1
]}

机构：

[1] Univ Autonoma San Luis Potosi, Fac Ciencias Quim, Ctr Invest & Estudios Posgrado, San Luis Potosi 78210, Mexico

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2008年 / 330卷 / 01期

关键词：

Adsorption; Chromium (VI); Surfactant-modified zeolite;

D O I：

10.1016/j.colsurfa.2008.07.025

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 [物理化学]; 081704 [应用化学];

摘要：

The adsorption equilibrium data of Cr(VI) from an aqueous solution on a surfactant-modified zeolite (SMZ) was determined in a batch adsorber. The SMZ was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium (HDTMA) bromide on the external surface of the zeolite. The surface area and pore volume were determined by the N-2-BET method and it was found that the surface area and pore volume were reduced due to pore blocking caused by the surfactant molecules adsorbed on the zeolite. The Cr(VI) was adsorbed considerably on SMZ but not on the natural zeolite. The effects of the temperature and pH on the adsorption isotherm were investigated in this work. The Cr(VI) adsorption capacity of SMZ showed a maximum at pH 6 and diminished 18 and 2.7 times increasing pH from 6 to 10 and decreasing pH from 6 to 4. respectively. The adsorption capacity was reduced by increasing the temperature from 15 to 25 degrees C since the adsorption of Cr(VI) on SMZ was due to an exothermic reaction. Desorption studies showed that Cr(VI) was irreversibly adsorbed on SMZ corroborating that Cr(VI) was chemisorbed on the SMZ. A comparison of the Cr(VI) adsorption capacities revealed that the capacities decreased in the following order: commercial granular activated carbon > organobentonite > SMZ. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：35 / 41

页数：7

共 21 条

[1]

APHA, 1985, STAND METH EX WAT WA

[2]

Effect of pH and temperature on the ion-exchange isotherm of Cd(II) on Pb(II) on clinoptilolite [J].