title: Simultaneous Reduction of Vanadium (V) and Chromium (VI) in Wastewater by Nanosized ZnWO4 Photocatalysis.
abstract: Vanadium (V, V) and chromium (Cr, VI) are simultaneously photocatalytically reduced to less-toxic V(VI) and Cr(III) by mimetic solar light with ZnWO4 nanoparticles prepared by hydrothermal synthesis. The reduction efficiencies can reach 68.8% for V(V) and 97.3% for Cr(VI) in 3 h, respectively, which are comparable to those by microbial fuel cell technology carried out in over 10 days. The prepared ZnWO4 nanoparticles are characterized by XRD, SEM, EDS, TEM, and Uv-vis-DRS tests. Electrochemical calculation shows high acidity benefits the rapid reduction of V(V) and Cr(VI). In addition, the applied ZnWO4 nanoparticles can be recycled and reused for 5 repeated photocatalytic reduction runs. And after 5 runs, the recycled ZnWO4 nanoparticles can also present good photocatalytic activity with a reduction efficiency of about 60% for V(V) and 90% for Cr(VI). The new procedure on the simultaneous reduction of V(V) and Cr(VI) by photocatalysis may be promisingly applied in contaminated wastewaters, combining the remediation and possible V and Cr recovery.
authors.forename: Zengying
authors.initials: Z
authors.lastname: Zhao
authors.forename: Baogang
authors.initials: B
authors.lastname: Zhang
authors.forename: Daimei
authors.initials: D
authors.lastname: Chen
authors.forename: Zhanhu
authors.initials: Z
authors.lastname: Guo
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Peng
mesh_terms: D002384:Catalysis; D002857:Chromium / Q000737:chemistry*; D008854:Microscopy, Electron / Q000379:methods; D049329:Nanostructures; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D014414:Tungsten / Q000737:chemistry*; D014639:Vanadium / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D002857:Chromium; D010087:Oxides; D014414:Tungsten; D014639:Vanadium; D062065:Wastewater; D015032:Zinc; C511604:tungsten oxide