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Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium.
J Hazard Mater. 2005 Oct 17; 125(1-3):102-12.JH

Abstract

A biosorbent, Neem leaf powder (NLP), was prepared from the mature leaves of the Azadirachta indica (Neem) tree by initial cleaning, drying, grinding, washing to remove pigments and redrying. The powder was characterized with respect to specific surface area (21.45 m2g(-1)), surface topography and surface functional groups and the material was used as an adsorbent in a batch process to remove Cd(II) from aqueous medium under conditions of different concentrations, NLP loadings, pH, agitation time and temperature. Adsorption increased from 8.8% at pH 4.0 to 70.0% at pH 7.0 and 93.6% at pH 9.5, the higher values in alkaline medium being due to removal by precipitation. The adsorption was very fast initially and maximum adsorption was observed within 300 min of agitation. The kinetics of the interactions was tested with pseudo first order Lagergren equation (mean k(1)=1.2x10(-2)min(-1)), simple second order kinetics (mean k2=1.34x10(-3) gmg(-1)min(-1)), Elovich equation, liquid film diffusion model (mean k=1.39x10(-2)min(-1)) and intra-particle diffusion mechanism. The adsorption data gave good fits with Langmuir and Freundlich isotherms and yielded Langmuir monolayer capacity of 158mgg(-1) for the NLP and Freundlich adsorption capacity of 18.7 Lg(-1). A 2.0 g of NLP could remove 86% of Cd(II) at 293 K from a solution containing 158.8 mg Cd(II) per litre. The mean values of the thermodynamic parameters, DeltaH, DeltaS and DeltaG, at 293 K were -73.7 kJmol(-1), -0.24 Jmol(-1)K(-1) and -3.63 kJmol(-1), respectively, showing the adsorption process to be thermodynamically favourable. The results have established good potentiality for the Neem leaf powder to be used as a biosorbent for Cd(II).

Authors+Show Affiliations

Sharma A
Department of chemistry, Gauhati University, Guwahati 781014, Assam, India.
Bhattacharyya KG
No affiliation info available

MeSH

AdsorptionAzadirachtaCadmiumHydrogen-Ion ConcentrationKineticsPlant LeavesPowdersSolutionsSurface-Active AgentsThermodynamicsWaterWater Pollutants, ChemicalWater Pollution, Chemical

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

15961221

Citation

Sharma, Arunima, and Krishna G. Bhattacharyya. "Azadirachta Indica (Neem) Leaf Powder as a Biosorbent for Removal of Cd(II) From Aqueous Medium." Journal of Hazardous Materials, vol. 125, no. 1-3, 2005, pp. 102-12.
Sharma A, Bhattacharyya KG. Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium. J Hazard Mater. 2005;125(1-3):102-12.
Sharma, A., & Bhattacharyya, K. G. (2005). Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium. Journal of Hazardous Materials, 125(1-3), 102-12.
Sharma A, Bhattacharyya KG. Azadirachta Indica (Neem) Leaf Powder as a Biosorbent for Removal of Cd(II) From Aqueous Medium. J Hazard Mater. 2005 Oct 17;125(1-3):102-12. PubMed PMID: 15961221.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium. AU - Sharma,Arunima, AU - Bhattacharyya,Krishna G, PY - 2005/02/06/received PY - 2005/05/07/revised PY - 2005/05/07/accepted PY - 2005/6/18/pubmed PY - 2006/2/24/medline PY - 2005/6/18/entrez SP - 102 EP - 12 JF - Journal of hazardous materials JO - J Hazard Mater VL - 125 IS - 1-3 N2 - A biosorbent, Neem leaf powder (NLP), was prepared from the mature leaves of the Azadirachta indica (Neem) tree by initial cleaning, drying, grinding, washing to remove pigments and redrying. The powder was characterized with respect to specific surface area (21.45 m2g(-1)), surface topography and surface functional groups and the material was used as an adsorbent in a batch process to remove Cd(II) from aqueous medium under conditions of different concentrations, NLP loadings, pH, agitation time and temperature. Adsorption increased from 8.8% at pH 4.0 to 70.0% at pH 7.0 and 93.6% at pH 9.5, the higher values in alkaline medium being due to removal by precipitation. The adsorption was very fast initially and maximum adsorption was observed within 300 min of agitation. The kinetics of the interactions was tested with pseudo first order Lagergren equation (mean k(1)=1.2x10(-2)min(-1)), simple second order kinetics (mean k2=1.34x10(-3) gmg(-1)min(-1)), Elovich equation, liquid film diffusion model (mean k=1.39x10(-2)min(-1)) and intra-particle diffusion mechanism. The adsorption data gave good fits with Langmuir and Freundlich isotherms and yielded Langmuir monolayer capacity of 158mgg(-1) for the NLP and Freundlich adsorption capacity of 18.7 Lg(-1). A 2.0 g of NLP could remove 86% of Cd(II) at 293 K from a solution containing 158.8 mg Cd(II) per litre. The mean values of the thermodynamic parameters, DeltaH, DeltaS and DeltaG, at 293 K were -73.7 kJmol(-1), -0.24 Jmol(-1)K(-1) and -3.63 kJmol(-1), respectively, showing the adsorption process to be thermodynamically favourable. The results have established good potentiality for the Neem leaf powder to be used as a biosorbent for Cd(II). SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/15961221/Azadirachta_indica__Neem__leaf_powder_as_a_biosorbent_for_removal_of_Cd_II__from_aqueous_medium_ DB - PRIME DP - Unbound Medicine ER -