title: Uranium remediation using modified Vigna radiata waste biomass.
abstract: Present study was designed to explore the possibility of Vigna radiata biomass for recovery of uranium ions. Various fundamental process parameters i.e., pH, contact time, temperature and initial uranium ions concentration were optimized and maximum uranium removal (230mg/g) was achieved at pH 4, biosorbent dose 0.05g, contact time 60min contact time and temperature 40°C using 400mg/L uranium ions concentration. The biomass was also pre-treated by different physical and chemical pretreatments to check out their effect on the adsorption capacity. Different kinetic and equilibrium models were applied to the experimental data to understand the uranium adsorption mechanism. Freundlich isotherm and pseudo-second order kinetic model explained well the adsorption of uranium ions onto Vigna radiata biomass. The biomass physical and chemical pretreatments significantly affected the uranium adsorption and CH3COOH 0.15M solution found out to be efficient for de-sorption. FT-IR analysis of native and loaded biomass confirmed the involvement of carbonyl and hydroxyl groups in the uranium adsorption process. The results outcome revealed that Vigna radiata biomass can be used for uranium adsorption in view of low cost and high adsorption efficiency.
authors.affiliation: Environmental Chemistry Laboratory, Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan.
authors.forename: Hafiza
authors.initials: H
authors.lastname: Naeem
authors.affiliation: Environmental Chemistry Laboratory, Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan. Electronic address: hnbhatti2005@yahoo.com.
authors.forename: Haq Nawaz
authors.initials: HN
authors.lastname: Bhatti
authors.affiliation: Bio-Analytical Chemistry Laboratory, Punjab Bio-Energy Institute, University of Agriculture, Faisalabad 38040, Pakistan.
authors.forename: Sana
authors.initials: S
authors.lastname: Sadaf
authors.affiliation: Department of Chemistry, The University of Lahore, Lahore, Pakistan. Electronic address: bosalvee@yahoo.com.
authors.forename: Munawar
authors.initials: M
authors.lastname: Iqbal
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014501:Uranium / Q000302:isolation & purification*; D000070658:Vigna; D014875:Water Pollutants, Radioactive / Q000302:isolation & purification*
chemical_list: D014875:Water Pollutants, Radioactive; D014501:Uranium
keywords: De-sorption; Equilibrium; Kinetics; Surface modification; Uranium; Vigna radiata