Removal of Zn2+ from aqueous solution using castor seed hull

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The effects of various experimental parameters on adsorption of Zn 2+ metal ion from its aqueous solution by castor seed hull and also by activated carbon have been investigated using batch adsorption experiments. It has been found that the amount of zinc adsorbed per unit mass of the hull increases with the initial metal ion concentration, contact time, solution pH and with the amount of the adsorbent. Kinetic experiments clearly indicate that adsorption of zinc on both castor hull and activated carbon is a three-step process-a rapid adsorption of the metal ion, a transition phase, and an almost flat plateau. This has also been confirmed by the intraparticle diffusion model. It has also been found that the zinc adsorption process followed pseudo-second order kinetics. The kinetic parameters including rate constants have been determined at different initial metal ion concentration, pH, amount, and type of adsorbent, respectively. The Langmuir and Freundlich adsorption isotherm models have been used to interpret the equilibrium adsorption data. The Langmuir model yields better correlation coefficients. The monolayer adsorption capacities (q m ) of castor hull and activated carbon have been compared with those for others reported in the literature. The value of separation factor (R L ) derived from the Langmuir model gives an indication of favorable adsorption. Finally, from comparative studies, it has been found that castor hull is a potentially attractive adsorbent as compared to commercial activated carbon for the removal of zinc from aqueus effluents.

Original languageEnglish
Pages (from-to)609-620
Number of pages12
JournalWater, Air, and Soil Pollution
Volume215
Issue number1-4
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

Fingerprint

hull
Seed
aqueous solution
adsorption
seed
Adsorption
Activated carbon
Metal ions
Zinc
activated carbon
Adsorbents
zinc
ion
metal
kinetics
Kinetics
removal
R Factors
Adsorption isotherms
Kinetic parameters

Keywords

  • Activated carbon
  • Adsorption isotherm
  • Adsorption kinetics
  • Castor hull
  • Zinc adsorption

ASJC Scopus subject areas

  • Pollution
  • Environmental Chemistry
  • Environmental Engineering
  • Ecological Modelling
  • Water Science and Technology

Cite this

Removal of Zn2+ from aqueous solution using castor seed hull. / Mohammad, Masita; Sen, Tushar Kanti; Maitra, Saikat; Dutta, Binay K.

In: Water, Air, and Soil Pollution, Vol. 215, No. 1-4, 02.2011, p. 609-620.

Research output: Contribution to journalArticle

Mohammad, Masita ; Sen, Tushar Kanti ; Maitra, Saikat ; Dutta, Binay K. / Removal of Zn2+ from aqueous solution using castor seed hull. In: Water, Air, and Soil Pollution. 2011 ; Vol. 215, No. 1-4. pp. 609-620.
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