title: Biosorptive removal of inorganic arsenic species and fluoride from aqueous medium by the stem of Tecomella undulate.
abstract: Simultaneous removal of fluoride (F(-)), inorganic arsenic species, As(III) and As(V), from aqueous samples has been performed using an economic indigenous biosorbent (Stem of Tecomella undulata). The inorganic As species in water samples before and after biosorption were determined by cloud point and solid phase extraction methods, while F(-) was determined by ion chromatography. Batch experiments were carried out to evaluate the equilibrium adsorption isotherm studies for As(III), As(V) and F(-) in aqueous solutions. Several parameters of biosorption were optimized such as pH, biomass dosage, analytes concentration, time and temperature. The surface of biosorbent was characterized by SEM and FTIR. The FTIR study indicated the presence of carbonyl and amine functional groups which may have important role in the sorption/removal of these ions. Thermodynamic and kinetic study indicated that the biosorption of As(III), As(V) and F(-) were spontaneous, exothermic and followed by pseudo-second-order. Meanwhile, the interference study revealed that there was no significant effect of co-existing ions for the removal of inorganic As species and F(-) from aqueous samples (p > 0.05). It was observed that the indigenous biosorbent material simultaneously adsorbed As(III) (108 μg g(-1)), As(V) (159 μg g(-1)) and F(-) (6.16 mg g(-1)) from water at optimized conditions. The proposed biosorbent was effectively regenerated and efficiently used for several experiments, to remove the As(III), As(V) and F(-) from real water sample collected from endemic area of Pakistan.
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: kr_brahman@yahoo.com.
authors.forename: Kapil Dev
authors.initials: KD
authors.lastname: Brahman
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: tgkazi@yahoo.com.
authors.forename: Tasneem Gul
authors.initials: TG
authors.lastname: Kazi
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: jab_mughal@yahoo.com.
authors.forename: Jameel Ahmed
authors.initials: JA
authors.lastname: Baig
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: hassanimranafridi@yahoo.com.
authors.forename: Hassan Imran
authors.initials: HI
authors.lastname: Afridi
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: ssadiashafi@gmail.com.
authors.forename: Sadaf Sadia
authors.initials: SS
authors.lastname: Arain
authors.affiliation: Department of Information Technology, Quaid-e-Awam University of Engineering Science & Technology, Pakistan. Electronic address: Saimasiraj@quest.edu.pk.
authors.forename: Saima
authors.initials: S
authors.lastname: Saraj
authors.affiliation: Chemistry Department, Abdul Wali Khan University, Mardan, Pakistan. Electronic address: bilal_ku2004@yahoo.com.
authors.forename: Muhammad B
authors.initials: MB
authors.lastname: Arain
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. Electronic address: salma_arain67@yahoo.com.
authors.forename: Salma Aslam
authors.initials: SA
authors.lastname: Arain
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D029402:Bignoniaceae / Q000737:chemistry*; D018533:Biomass; D005459:Fluorides / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010154:Pakistan; D018547:Plant Stems / Q000737:chemistry*; D052616:Solid Phase Extraction; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D001151:Arsenic; D005459:Fluorides
keywords: Arsenic; Biosorption; Fluoride; Kinetics; Tecomella undulata; Thermodynamics