In this study, a flat-type photocatalytic reactor is applied under solar irradiation for simultaneous treatment of target pollutants: reduction of Cr(VI) to Cr(III) and oxidation of EDCs (BPA, EE2, E2). An immobilized type of photocatalyst was fabricated to have self-grown nanotubes on its surface in order to overcome limitations of powdery photocatalyst. Moreover, Ti mesh form was chosen as substrate and modified to have both larger surface area and photocatalyst content. Ti mesh was anodized at 50V and 25°C for 30min in the mixed electrolytes (NH4F-H2O-C2H6O2) and annealed at 450°C for 2 hours in ambient oxygen to have anatase structure. Surface characterization was done with SEM and XRD methodologies. Fabricated NTT was applied to water treatment, and coexisting Cr(VI) and organics (EDCs) enhanced each other's reactions by scavenging holes and electrons and thus impeding recombination. Also, several experiments were conducted outdoor under direct sunlight and it was observed that both solar-tracking and applying modified photocatalyst were proven to enhance reaction efficiency.

• 김세원(충남대학교 에너지과학기술대학원) | Saewon Kim (Chungnam National University, Graduate School of Energy Science and Technology)
• 조혜경(한양대학교 건설환경공학과) | Hyekyung Cho (Hanyang University, Department of Civil and Environmental Engineering)
• 주현규(한국에너지기술연구원 신재생연구본부 수소연구실) | Hyunku Joo (Korea Institute of Energy Research, New & Renewable Energy Division, Hydrogen Laboratory)
• 허남국(육군삼사관학교 건설환경학과) | Namguk Her (Korea Army Academy at Young-Choen, Department of Chemistry and Environmental Science)
• 이광복(충남대학교 에너지과학기술대학원) | Kwangbok Yi (Chungnam National University, Graduate School of Energy Science and Technology)
• 김종오(한양대학교 건설환경공학과) | Jong Oh Kim (Hanyang University, Department of Civil and Environmental Engineering)
• 윤재경(한국에너지기술연구원 신재생연구본부 수소연구실) | Jaekyung Yoon (Korea Institute of Energy Research, New & Renewable Energy Division, Hydrogen Laboratory) Corresponding author