title: Reduction of hexavalent chromium using Aerva lanata L.: elucidation of reduction mechanism and identification of active principles.
abstract: The effluent discharge treatment for controlling the environment from non biodegradable metal contaminants using plant extract is an efficient technique. The reduction of hexavalent chromium by abundantly available weed, Aerva lanata L. was investigated using batch equilibrium technique. The variables studied were Cr(VI) concentration, Aerva lanata L. dose, contact time, pH, temperature and agitation speed. Cyclic voltammetry and ICP-MS analysis confirmed the reduction of Cr(VI) to Cr(III). Electrochemical analysis proved that, the chromium has not been degraded and the valency of the chromium has only been changed. ICP-MS analysis shows that 100ng/L of hexavalent chromium was reduced to 97.01ng/L trivalent chromium. These results suggest that components present in the Aerva lanata L. are responsible for the reduction of Cr(VI) to Cr(III). The prime components ferulic acid, kaempherol and β-carboline present in the Aerva lanata L. may be responsible for the reduction of Cr(VI) as evident from LC-MS analysis.
authors.affiliation: Bioprocess and Engineering Laboratory, Department of Biochemistry, Periyar University, Salem - 11, Tamil Nadu, India.
authors.forename: K
authors.initials: K
authors.lastname: Poonkuzhali
authors.affiliation: Coordination Chemistry Research Laboratory, Department of chemistry, Periyar University, Salem - 11, Tamil Nadu, India.
authors.forename: V
authors.initials: V
authors.lastname: Rajeswari
authors.affiliation: Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, Korea.
authors.forename: T
authors.initials: T
authors.lastname: Saravanakumar
authors.affiliation: Coordination Chemistry Research Laboratory, Department of chemistry, Periyar University, Salem - 11, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Viswanathamurthi
authors.affiliation: Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, Korea.
authors.forename: Seung-Moon
authors.initials: SM
authors.lastname: Park
authors.affiliation: Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, Korea.
authors.forename: M
authors.initials: M
authors.lastname: Govarthanan
authors.affiliation: Institute of Environmental and Water Resource Management (IPASA), Building No.: C07, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia.
authors.forename: P
authors.initials: P
authors.lastname: Sathishkumar
authors.affiliation: Bioprocess and Engineering Laboratory, Department of Biochemistry, Periyar University, Salem - 11, Tamil Nadu, India. Electronic address: pal2912@yahoo.com.
authors.forename: T
authors.initials: T
authors.lastname: Palvannan
mesh_terms: D027703:Amaranthaceae / Q000378:metabolism*; D002243:Carbolines / Q000737:chemistry; D002853:Chromatography, Liquid; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D003373:Coumaric Acids / Q000737:chemistry; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D044949:Kaempferols / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D002243:Carbolines; D003373:Coumaric Acids; D007220:Industrial Waste; D044949:Kaempferols; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; C004999:ferulic acid
keywords: Aerva lanata; Cyclic voltammetry; Hexavalent chromium; ICP-MS; LC-MS.