title: Chromium sorption and Cr(VI) reduction to Cr(III) by grape stalks and yohimbe bark.
abstract: In this work, two low cost sorbents, grape stalks and yohimbe bark wastes were used to remove Cr(VI) and Cr(III) from aqueous solutions. Batch experiments were designed to obtain Cr(VI) and Cr(III) sorption data. The mechanism of Cr(III) and Cr(VI) removal and Cr(VI) reduction to Cr(III) by the two vegetable wastes, has been investigated. Fourier transform infrared rays (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis on solid phase were performed to determine the main functional groups that might be involved in metal uptake and to confirm the presence of Cr(III) on the sorbent, respectively. Results put into evidence that both sorbents are able to reduce Cr(VI) to its trivalent form.
authors.affiliation: Chemical Engineering Department, Universitat de Girona, Avda. Lluís Santaló, s/n, 17071 Girona, Spain.
authors.forename: Núria
authors.initials: N
authors.lastname: Fiol
authors.forename: Carlos
authors.initials: C
authors.lastname: Escudero
authors.forename: Isabel
authors.initials: I
authors.lastname: Villaescusa
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D032068:Pausinystalia / Q000378:metabolism*; D024301:Plant Bark / Q000378:metabolism*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013997:Time Factors; D027843:Vitis / Q000378:metabolism*
chemical_list: D012996:Solutions; D002857:Chromium