Removal of cadmium from aqueous solution using castor seed hull: A kinetic and equilibrium study

Tushar Kanti Sen, Masita Mohammad, Saikat Maitra, Binay K. Dutta

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The effects of various parameters such as initial concentration, adsorbent loading, pH, and contact time on kinetics and equilibrium of adsorption of Cd2+ metal ion from its aqueous solution by castor seed hull (CSH) and also by activated carbon have been investigated by batch adsorption experiments. The amount of adsorption increases with initial metal ion concentration, contact time, solution pH, and the loading of adsorbent for both the systems. Kinetic experiments indicate that adsorption of cadmium metal ion on both CSH and on activated carbon consists of three steps - a rapid adsorption of cadmium metal ion, a transition phase, and an almost flat plateau region. This has also been confirmed by the intraparticle diffusion model. The lumped kinetic results show that the cadmium adsorption process follows a pseudo-second order rate law. The kinetic parameters including the rate constant are determined at different initial metal ion concentrations, pH, amount, and type of adsorbent, respectively. The Langmuir and Freundlich adsorption isotherm models are used to describe the experimental data. The Langmuir model yields a better correlation coefficient than the other model. A comparison of the monolayer adsorption capacity (qm) of CSH, activated carbon, and several other reported adsorbents has been provided. The value of separation factor (RL) calculated from the Langmuir equation also gives an indication of favorable adsorption of the metal ion. From comparative studies, it has been found that CSH is a potentially attractive adsorbent than commercial activated carbon for cadmium metal ion (Cd2+) removal. Castor seed hull is found to be an effective adsorbent for cadmium removal. The adsorption process follows a pseudo-second order mechanism.

Original languageEnglish
Pages (from-to)850-858
Number of pages9
JournalClean - Soil, Air, Water
Volume38
Issue number9
DOIs
Publication statusPublished - Sep 2010
Externally publishedYes

Fingerprint

hull
Cadmium
Seed
cadmium
aqueous solution
Metal ions
adsorption
seed
Adsorption
kinetics
Adsorbents
Kinetics
Activated carbon
ion
metal
activated carbon
removal
Adsorption isotherms
Kinetic parameters
Contacts (fluid mechanics)

Keywords

  • Activated carbon
  • Adsorption isotherm
  • Cadmium adsorption
  • Castor hull
  • Kinetic model

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Pollution

Cite this

Removal of cadmium from aqueous solution using castor seed hull : A kinetic and equilibrium study. / Sen, Tushar Kanti; Mohammad, Masita; Maitra, Saikat; Dutta, Binay K.

In: Clean - Soil, Air, Water, Vol. 38, No. 9, 09.2010, p. 850-858.

Research output: Contribution to journalArticle

Sen, Tushar Kanti ; Mohammad, Masita ; Maitra, Saikat ; Dutta, Binay K. / Removal of cadmium from aqueous solution using castor seed hull : A kinetic and equilibrium study. In: Clean - Soil, Air, Water. 2010 ; Vol. 38, No. 9. pp. 850-858.
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