Remediation of groundwater polluted with nitrate (NO3–) by photo-catalytic reduction over metal-loaded semiconductor photo-catalysts.
In this study, investigation of photo-catalytic reduction of nitrate in water over Cu-Pd bimetal loaded semiconductor were conducted, including several type of catalyst (TiO2 (anatase), TiO2 (rutile), ZnO, ZrO, SrTiO3, and WO3). The reaction was systemically investigated in the presence of light and no light. It is shown, that TiO2 supperted by Cu-Pd more suited for efficient nitrate reduction compared to other. Thus, it is expected that the efficiency of bimetal loaded TiO2 can be used to reduced high amount of nitrate (wastewater). However in very high Nitrate concentration, the reduction were not efficient .The catalytic reduction of nitrates was efficiently performed with H2 or H2 + HCOOH as the reductant, but was poorly efficient in the presence of HCOOH alone. In the photocatalytic experiments, UV irradiation significantly improved the reaction provided that both H2 + HCOOH were present.
Keywords: Bimetal; semiconductor; Pd-Cu; TiO2; Nitrate reduction; Photo-catalytic; Groundwater, wastewater.
 JENESYS 2010 Participant, Graduated School of Environmental Science, Hokkaido University
 Graduated School of Environmental Science, Hokkaido University
 Assoc. Prof of Graduated School of Environmental Science, Hokkaido University