“…For example, several kinds of hazardous pollutants such as organic/inorganic dyes, pharmaceuticals, heavy metals, herbicides, surfactants, microorganisms, and pesticides were amputated from industrial wastewater via the oxide semiconductor-based photocatalysis [4] , [5] , [6] , [7] , [8] , [9] . Among various OSs, cerium dioxide (CeO 2 ) has attracted significant attention as an efficient photocatalyst because of its high photo-stability, high oxygen storage capacity, non-toxicity, photocorrosion resistance behavior, low cost, high thermal stability, and strong light absorption in the ultra-violet (UV) wavelength region [10] , [11] , [12] . However, the large bandgap energy (3.2 eV) and the high photocarrier recombination rate of the CeO 2 nanostructures have somewhat degraded their photocatalytic activities [13] , [14] .…”