Back to Search Start Over

Metals Bioaccumulation Mechanism in Neem Bark

Authors :
Kishore Kumar Krishnani
V. Kathiravan
Deok Hyun Moon
Veera M. Boddu
S.V. Ghadge
M. P. Brahmane
Biplab Sarkar
Khushboo Choudhary
Xiaoguang Meng
Source :
Bulletin of Environmental Contamination and Toxicology. 95:414-419
Publication Year :
2015
Publisher :
Springer Science and Business Media LLC, 2015.

Abstract

The aim of this work was to define the bioaccumulation mechanism of metals onto the non-living biomaterial prepared from an extensively available plant bark biomass of neem (Azadirachta indica). Based on maximum ultimate fixation capacities (mmol/g) of the product, metals ions could be arranged as Hg(2+) < Cd(2+) < Pb(2+) ≅ Cu(2+). Surface properties of the biomaterial were characterized by X-ray photoelectron spectroscopy and X-ray diffraction techniques for their sorption mechanism. Whewellite (C2CaO4 · H2O) was identified in the biomaterial, which indicated that calcium ions are electrovalently bonded with carboxylate ions facilitating the ion exchange mechanism with metal ions. Bioaccumulation of metal ions was also studied by Fourier transform infrared spectroscopy, which indicated the presence of functional groups implicated in adsorbing metal ions. Biomaterial did not adsorb anionic As(III), As(V) and Cr(VI), because of their electrostatic repulsion with carboxylic functional groups. Neem bark can be used as bioindicators, bioaccumulators and biomonitors while determining environmental pressures. Metal bioaccumulative properties and structural investigation of plant bark has potential in providing quantitative information on the metal contamination in the surrounding environment.

Details

ISSN :
14320800 and 00074861
Volume :
95
Database :
OpenAIRE
Journal :
Bulletin of Environmental Contamination and Toxicology
Accession number :
edsair.doi.dedup.....79e7a1af8df2082d502de86c7e7f9ae8