title: Reduction and removal of Cr(VI) from aqueous solutions using modified byproducts of beer production.
abstract: Biosorption, as an effective and low-cost technology treating industrial wastewaters containing Cr(VI), has become a significant concern worldwide. In this work, acid-modified byproducts of beer production (BBP) were used to remove Cr(VI) from aqueous solutions. Removal of Cr(VI) increases as the pH is decreased from 4.0 to 1.5, but the maximum of total Cr removal is obtained in a pH range from 2.0 to 2.5. Nearly 60% of the initial Cr(VI) (100 mg L(-1)) was adsorbed or reduced to Cr(III) within the first 10 min at pH 2.0. The Cr(VI) removal capability of acid-modified BBP materials was almost completely retained after regenerating with acid. FT-IR and XPS spectra revealed that carboxylate and carboxyl groups on the surface of modified BBP materials play a major role in Cr(VI) binding and reduction, whereas amide and other groups play a minor role in the Cr(VI) removal process.
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China. hjcui@iue.ac.cn
authors.forename: Haojie
authors.initials: H
authors.lastname: Cui
authors.forename: Minglai
authors.initials: M
authors.lastname: Fu
authors.forename: Shen
authors.initials: S
authors.lastname: Yu
authors.forename: Ming Kuang
authors.initials: MK
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001515:Beer; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007221:Industry; D007700:Kinetics; D056951:Photoelectron Spectroscopy; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014867:Water
chemical_list: D007220:Industrial Waste; D012996:Solutions; D014867:Water; D002857:Chromium; C074702:chromium hexavalent ion