Journal
CARBOHYDRATE POLYMERS
Volume 86, Issue 4, Pages 1533-1541Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.06.058
Keywords
Adsorption; NaOH-modified rice husk; Crystal Violet; Equilibrium; Kinetics; Thermodynamics
Categories
Ask authors/readers for more resources
In this study, equilibrium, kinetics and thermodynamics of Crystal Violet (CV) adsorption onto NaOH-modified rice husk (NMRH) was investigated. Experiments were carried out as function of contact time, initial solution pH (2-10), adsorbent dose (0.5-5 g) and temperature (293, 303 and 313 K). The adsorption was favoured at higher pHs and lower temperatures. Adsorption data were well described by the Freundlich model, although they could be modelled by the Langmuir model as well. The adsorption process followed the pseudo-second order kinetic model. The mass transfer model based on intraparticle diffusion was applied to the experimental data to examine the mechanisms of the rate controlling step. It was found that intraparticle diffusion was not the sole rate controlling step. The activation energy (E-a) of the system was calculated as 50.51 kJ mol(-1). Thermodynamic parameters suggest that the adsorption is a typical chemical process, spontaneous, and exothermic in nature. (C) 2011 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available