title: [Enhanced electro-chemical oxidation of Acid Red 3R solution with phosphotungstic acid supported on gamma-Al2O3].
abstract: Supported phosphotungstic acid catalysts on gamma-Al2O3 (HPW/gamma-Al2O3) were prepared by solution impregnation and characterized by FTIR, XRD, TG-DTA and SEM. The heteropolyanion shows a Keggin structure. Electro-chemical oxidation of Acid Red 3R was investigated in the presence of HPW supported on gamma-Al2O3 as packing materials in the reactor. The results show that HPW/gamma-Al2O3 has a good catalytic activity for decolorization of Acid Red 3R. When HPW loading was 4.6%, pH value of Acid Red 3R was 3, the voltage was 25.0 V, air-flow was 0.04 m3 x h(-1), and electrode span was 3.0 cm, the decolorization efficiency of Acid Red 3R can reach 97.6%. The removal rate of color had still about 80% in this electro-chemical oxidation system, after HPW/gamma-Al2O3 was used for 10 times, but active component loss existed. The interim product was analyzed by means of Vis-UV absorption spectrum. It shows that the conjugated structure of dye is destroyed primarily.
authors.affiliation: College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China. yuelintj@126.com
authors.forename: Lin
authors.initials: L
authors.lastname: Yue
authors.forename: Kai-Hong
authors.initials: KH
authors.lastname: Wang
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Guo
authors.forename: Jing-Liang
authors.initials: JL
authors.lastname: Yang
authors.forename: Bao-You
authors.initials: BY
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Lian
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D010084:Oxidation-Reduction; D010772:Phosphotungstic Acid / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D000537:Aluminum Oxide; D010772:Phosphotungstic Acid; D012235:Rhodamines; D062065:Wastewater; C022027:lissamine rhodamine B