title: Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment.
abstract: Flash fixation of heavy metals from electroplating wastewater (EPW) and pickling waste liquor (PWL) into ferrite lattice can be investigated by microwave hydrothermal process. The toxicity of wastewater may be reduced by the redox reaction between Cr(VI) in electroplating wastewater and Fe(II) in pickling waste liquor. Box-Behnken design (BBD) experiment gives optimal process condition of ferrite formation as follows: wastewater volume ratio (V(PWL):V(EPW) = 0.20), pH value 11 and retention time 15 min, on which formed ferrite has a soft magnetic property with high saturation magnetization (M(s)) 47.4 emu/g. The rapid ferrite process has lower activation energy 7.01 kJ/mol according to grain growth kinetics. Concerning the environmental and economy, we introduced a new and interesting method for water remediation simultaneously synthesizing ferrite by using microwave mediated hydrothermal processes.
authors.affiliation: College of Environmental Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Chen
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Mei
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Yao
authors.forename: Hong-Ming
authors.initials: HM
authors.lastname: Jin
authors.forename: Guang-Ren
authors.initials: GR
authors.lastname: Qian
authors.forename: Zhi-Ping
authors.initials: ZP
authors.lastname: Xu
mesh_terms: D002857:Chromium / Q000737:chemistry*; D004595:Electroplating; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D008872:Microwaves; D010084:Oxidation-Reduction; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D015032:Zinc / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D007220:Industrial Waste; D019216:Metals, Heavy; D012722:Sewage; D014874:Water Pollutants, Chemical; D002857:Chromium; C001215:ferrite; D007501:Iron; D015032:Zinc