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Metals Bioaccumulation Mechanism in Neem Bark
- 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.
- Subjects :
- Surface Properties
Health, Toxicology and Mutagenesis
Metal ions in aqueous solution
Inorganic chemistry
Toxicology
Arsenic
Metal
chemistry.chemical_compound
Adsorption
X-Ray Diffraction
Metals, Heavy
Spectroscopy, Fourier Transform Infrared
Plant Bark
Biomass
Carboxylate
Azadirachta
Ion exchange
biology
Photoelectron Spectroscopy
General Medicine
biology.organism_classification
Pollution
chemistry
Bioaccumulation
visual_art
visual_art.visual_art_medium
Environmental Monitoring
Subjects
Details
- ISSN :
- 14320800 and 00074861
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Bulletin of Environmental Contamination and Toxicology
- Accession number :
- edsair.doi.dedup.....79e7a1af8df2082d502de86c7e7f9ae8