Composites of P25 TiO2 and hexagonal WO3 nanorods are synthesized through ball-milling in order to study photocatalytic properties. Various composites of TiO2/WO3 are prepared by controlling the weight percentages (wt%) of WO3, in the range of 1–30 wt%, and milling time to investigate the effects of the composition ratio on the photocatalytic properties. Scanning electron microscopy, x-ray diffraction, and transmission electron microscopy are performed to characterize the structure, shape and size of the synthesized composites of TiO2/WO3. Methylene blue is used as a test dye to analyze the photocatalytic properties of the synthesized composite material. The photocatalytic activity shows that the decomposition efficiency of the dye due to the photocatalytic effect is the highest in the TiO2/ WO3 (3 wt%) composite, and the catalytic efficiency decreases sharply when the amount of WO3 is further increased. As the amount of WO3 added increases, dye-removal by adsorption occurs during centrifugation, instead of the decomposition of dyes by photocatalysts. Finally, TiO2/WO3 (3 wt%) composites are synthesized with various milling times. Experimental results show that the milling time has the best catalytic efficiency at 30 min, after which it gradually decreases. There is no significant change after 1 hour.

Abstract
 1. 서 론
 2. 실험 방법
  2.1. TiO2/WO3 제조에 필요한 재료
  2.2. 볼밀을 이용한 TiO2/WO3 복합체 합성
  2.3. 분석기기
  2.4. 광촉매 실험
 3. 결과 및 고찰
 4. 결 론
 References

• 유수열(한남대학교 광전자물리학과) | Su-Yeol Yu (Department of Applied Physics, Hannam University)
• 남충희(한남대학교 광전자물리학과, 한남대학교 광·센서공학과) | Chunghee Nam (Department of Applied Physics, Hannam University, Department of Photonics and Sensors, Hannam University) Corresponding Author