期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 179, 期 1-3, 页码 658-664出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.03.053
关键词
Dye removal; Luffa cylindrica; Sorption kinetics; Thermodynamic aspects
In this work, application of Luffa cylindrica in malachite green (MG) removal from aqueous solution was studied in a batch system. The effect of contact time, pH and temperature on removal of malachite green was also investigated. By the time pH was increased from 3 to 5, the amount of sorbed malachite green also increased. Beyond the pH value of 5, the amount of sorbed malachite green remains constant. The fits of equilibrium sorption data to Langmuir, Freundlich and Dubinin-Radushkevich equations were investigated. Langmuir isotherm exhibited best fit with the experimental data. Monolayer sorption capacity increased with the increasing of temperature. Sorption kinetic was evaluated by pseudo-first-order, pseudo-second-order. Elovich rate equations and intraparticle diffusion models. It was inferred that sorption follows pseudo-second-order kinetic model. Thermodynamic parameters for sorption process were also found out. Spontaneous and endothermic nature of sorption was obtained due to negative value of free energy (Delta G degrees) and positive value of enthalpy (Delta H degrees) changes. FTIR analyses were also conducted to confirm the sorption of malachite green onto L cylindrica. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据