A photocatalyst composition and an air filtration structure with the photocatalyst composition are provided. The air filtration structure is characteristic of the photocatalyst composition uniformly distributed on a substrate and comprises graphene as carriers, titanium dioxide with a nano-level particle sizes for structural modification, and refractive and reflective photoconductive materials by which titanium dioxide is irradiated by more ultraviolet or blue light to improve the air purification ability of the photocatalyst composition.本發明提供一種光觸媒組合物及具有光觸媒組合物的空氣過濾結構，其中空氣過濾結構係將光觸媒組合物係平均分布於基材之表面，此外本發明之光觸媒組合物係以石墨烯做為載體利用二氧化鈦維修飾的結構，以將二氧化鈦之粒徑保持在奈米級，再利用光導材料的折射光及反射光特性，讓更多的紫外光或藍外光能照射至二氧化鈦，以提高光觸媒組合物的空氣淨化能力。
