title: Competitive adsorption of toxic heavy metal contaminants by gum kondagogu (Cochlospermum gossypium): a natural hydrocolloid.
abstract: Gum kondagogu (Cochlospermum gossypium), a naturally occurring tree biopolymer, is exploited as a biosorbent to remove metal ions from aqueous solutions. The removal efficiency of toxic metals by gum kondagogu was determined quantitatively in the order Cd2+ > Cu2+ > Fe2+ > Se2+ > Pb2+ > total Cr > Ni2+ > Zn2+ > Co2+ > As2+ at pH 5.0+/-0.1 and temperature 25+/-2 degrees C by inductively coupled plasma-mass spectrometry (ICP-MS). The biosorption (%) of various metal ions tested was found to be in the range of 97.3-16.7%, at pH 5.0. The morphological and mechanisms of interaction of toxic metal ions with gum kondagogu were assessed by scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM-EDXA) and X-ray diffraction (XRD) spectrum. The analysis indicated that biosorption process included morphological changes, precipitation, complexation and ion exchange mechanism for the removal of metal ions by the gum. XRD analysis indicated the amorphous nature of gum kondagogu, which facilitate metal biosorption. The metal ions adsorption leads to its deposition on the gum kondagogu matrix in a crystalline state.
authors.affiliation: Jonaki, Board of Radiation and Isotope Technology (BRIT), Department of Atomic Energy (DAE), CCMB Campus, Uppal Road, Hyderabad 500007, Andhra Pradesh, India.
authors.forename: V T P
authors.initials: VT
authors.lastname: Vinod
authors.forename: R B
authors.initials: RB
authors.lastname: Sashidhar
authors.forename: A A
authors.initials: AA
authors.lastname: Sukumar
mesh_terms: D000327:Adsorption / Q000187:drug effects; D001673:Biodegradation, Environmental / Q000187:drug effects; D031212:Bixaceae / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry*; D019216:Metals, Heavy / Q000302:isolation & purification* / Q000633:toxicity*; D008855:Microscopy, Electron, Scanning; D053149:Plant Gums / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013054:Spectrophotometry, Atomic; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000633:toxicity*; D014961:X-Ray Diffraction
chemical_list: D003102:Colloids; D019216:Metals, Heavy; D053149:Plant Gums; D014874:Water Pollutants, Chemical