title: Adsorption of chromium from aqueous solutions using crosslinked chitosan-diethylenetriaminepentaacetic acid.
abstract: Chitosan (CH) and its derivatives have been the focus of attention for researchers as potential adsorbents for heavy metal removal. The adsorption potential of chitosan cross-linked with diethylenetriaminepentaacetic acid (CD) for Cr6+ was investigated. CD was characterized by FTIR, XRD, TGA, XPS and ESR techniques. Batch experiments were conducted to optimize the parameters affecting the adsorption of chromium. The optimum pH was found to be 3 and the adsorption process was found to be exothermic. Adsorption isotherms were determined and the maximum adsorption capacity of CD for chromium was found to be 192.3 mg/g which was higher than the adsorption capacity of the adsorbents reported in literature. The thermodynamic parameters, such as Gibbs free energy, changes in enthalpy and changes in entropy change were also evaluated. XPS and ESR studies revealed that Cr6+ adsorbed onto CD was reduced to Cr3+. The efficacy of CD for removal of Cr6+ from chrome plating effluent was demonstrated.
authors.affiliation: Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, India.
authors.forename: Ronak
authors.initials: R
authors.lastname: Bhatt
authors.affiliation: Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India.
authors.forename: B
authors.initials: B
authors.lastname: Sreedhar
authors.affiliation: Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, India. Electronic address: ppadmaja2010@yahoo.in.
authors.forename: P
authors.initials: P
authors.lastname: Padmaja
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D004369:Pentetic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D002857:Chromium; C060068:diethylenetriaminetetraacetic acid; D004369:Pentetic Acid; D048271:Chitosan
keywords: Adsorption; Chitosan; Chrome-plating effluent; Diethylenetriaminepentaacetic acid