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Adsorptive removal of heavy metals from aqueous solution by treated sawdust (Acacia arabica).
J Hazard Mater. 2008 Feb 11; 150(3):604-11.JH

Abstract

The removal of Cr(VI), Pb(II), Hg(II) and Cu(II), by treated sawdust has been found to be concentration, pH, contact time, adsorbent dose and temperature dependent. The adsorption parameters were determined using both Langmuir and Freundlich isotherm models. Adsorption capacity for treated sawdust, i.e. Cr(VI) (111.61 mg/g), Pb(II) (52.38 mg/g), Hg(II) (20.62 mg/g), and Cu(II) (5.64 mg/g), respectively. Surface complexation and ion exchange are the major removal mechanisms involved. The adsorption isotherm studies clearly indicated that the adsorptive behaviour of metal ions on treated sawdust satisfies not only the Langmuir assumptions but also the Freundlich assumptions. The applicability of Lagergren kinetic model has also been investigated. The adsorption follows first-order kinetics. Thermodynamic constant (k(ad)), standard free energy (DeltaG degrees), enthalpy (DeltaH degrees) and entropy (DeltaS degrees) were calculated for predicting the nature of adsorption. The percentage adsorption increases with pH to attain a maximum at pH 6 and thereafter it decreases with further increase in pH. The results indicate the potential application of this method for effluent treatment in industries and also provide strong evidence to support the adsorption mechanism proposed.

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Authors+Show Affiliations

Meena AK
Centre for Fire, Explosive & Environment Safety (CFEES), Defence R & D Organisation (DRDO), Brig. S.K. Mazumdar Road, Timarpur, Delhi 110054, India.
Kadirvelu K
No affiliation info available
Mishra GK
No affiliation info available
Rajagopal C
No affiliation info available
Nagar PN
No affiliation info available

MeSH

AcaciaAdsorptionHydrogen-Ion ConcentrationMetals, HeavySodium HydroxideSolutionsSulfuric AcidsTemperatureWater Pollutants, ChemicalWater PurificationWood

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17600619

Citation

Meena, Ajay Kumar, et al. "Adsorptive Removal of Heavy Metals From Aqueous Solution By Treated Sawdust (Acacia Arabica)." Journal of Hazardous Materials, vol. 150, no. 3, 2008, pp. 604-11.
Meena AK, Kadirvelu K, Mishra GK, et al. Adsorptive removal of heavy metals from aqueous solution by treated sawdust (Acacia arabica). J Hazard Mater. 2008;150(3):604-11.
Meena, A. K., Kadirvelu, K., Mishra, G. K., Rajagopal, C., & Nagar, P. N. (2008). Adsorptive removal of heavy metals from aqueous solution by treated sawdust (Acacia arabica). Journal of Hazardous Materials, 150(3), 604-11.
Meena AK, et al. Adsorptive Removal of Heavy Metals From Aqueous Solution By Treated Sawdust (Acacia Arabica). J Hazard Mater. 2008 Feb 11;150(3):604-11. PubMed PMID: 17600619.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorptive removal of heavy metals from aqueous solution by treated sawdust (Acacia arabica). AU - Meena,Ajay Kumar, AU - Kadirvelu,K, AU - Mishra,G K, AU - Rajagopal,Chitra, AU - Nagar,P N, Y1 - 2007/05/16/ PY - 2006/06/19/received PY - 2007/05/03/revised PY - 2007/05/03/accepted PY - 2007/6/30/pubmed PY - 2008/5/7/medline PY - 2007/6/30/entrez SP - 604 EP - 11 JF - Journal of hazardous materials JO - J Hazard Mater VL - 150 IS - 3 N2 - The removal of Cr(VI), Pb(II), Hg(II) and Cu(II), by treated sawdust has been found to be concentration, pH, contact time, adsorbent dose and temperature dependent. The adsorption parameters were determined using both Langmuir and Freundlich isotherm models. Adsorption capacity for treated sawdust, i.e. Cr(VI) (111.61 mg/g), Pb(II) (52.38 mg/g), Hg(II) (20.62 mg/g), and Cu(II) (5.64 mg/g), respectively. Surface complexation and ion exchange are the major removal mechanisms involved. The adsorption isotherm studies clearly indicated that the adsorptive behaviour of metal ions on treated sawdust satisfies not only the Langmuir assumptions but also the Freundlich assumptions. The applicability of Lagergren kinetic model has also been investigated. The adsorption follows first-order kinetics. Thermodynamic constant (k(ad)), standard free energy (DeltaG degrees), enthalpy (DeltaH degrees) and entropy (DeltaS degrees) were calculated for predicting the nature of adsorption. The percentage adsorption increases with pH to attain a maximum at pH 6 and thereafter it decreases with further increase in pH. The results indicate the potential application of this method for effluent treatment in industries and also provide strong evidence to support the adsorption mechanism proposed. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17600619/Adsorptive_removal_of_heavy_metals_from_aqueous_solution_by_treated_sawdust__Acacia_arabica__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)00688-7 DB - PRIME DP - Unbound Medicine ER -