2024-03-29T12:11:35Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/541122022-11-17T02:08:08Zhdl_2115_20051hdl_2115_144Combinational effect of Pt/SrTiO3:Rh photocatalyst and SnPd/Al2O3 non-photocatalyst for photocatalytic reduction of nitrate to nitrogen in water under visible light irradiationHirayama, JunAbe, RyuKamiya, YuichiNitrate reductionPhotocatalystGroundwater purificationTin-palladium bimetal431Photocatalytic reduction of nitrate in water in the co-presence of Pt/SrTiO3:Rh and SnPd/Al2O3 under visible light irradiation (lambda > 420 nm) was investigated. This reaction system efficiently and selectively promoted the photocatalytic reduction of nitrate to nitrogen, whereas Pt/SrTiO3:Rh or SnPd/Al2O3 alone showed little activity under the reaction conditions. The selectivity to N-2 was 94% under the optimum reaction conditions, where the amounts of Pt/SrTiO3:Rh and SnPd/Al2O3 loaded in the reaction system were 500 mg and 150 mg, respectively. This reaction system showed a superior nitrate decomposition rate and superior selectivity to nitrogen compared with SrTiO3:Rh directly modified with SnPd bimetal. From analysis of the reaction mechanism, hydrogen formed by photoreduction of water over Pt/SrTiO3:Rh acted as the reductant for a non-photocatalytic nitrate conversion reaction over SnPd/Al2O3. Moreover, the products, including formaldehyde and formic acid, formed by photo-oxidation of methanol over Pt/SrTiO3:Rh acted as reductants for nitrate over SnPd/Al2O3.Elsevier Science B.V.Journal Articleapplication/pdfapplication/pdfhttp://hdl.handle.net/2115/54112https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/54112/1/Bady%20text_APCATB-D-13-00813_Highlighted.pdfhttps://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/54112/2/Supporting%20Information_APCATB-D-13-00813.pdf0926-3373AA1082551XApplied Catalysis B: Environmental1447217292014-01enginfo:doi/10.1016/j.apcatb.2013.08.005(C) 2013 Elsevier B.V. All rights reserved.author