Try this? I'm not sure if i understood the question correctly
A composite photocatalyst of copper phosphotungstate/titanium dioxide (Cu-H3PW12O40/TiO2) : prepared by sol-gel hydrothermal synthesis.The composite catalyst was characterized by X-ray diffraction (XRD), UV–vis-diffuse reflectance spectroscopy (UV-VIS-DRS), Fourier converted infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS)、scanning electron microscopy (SEM) and power dispersive X-ray spectroscopy (EDS). The photocatalytic oxidation of a high-concentration NH4+/NH3 occured under ultraviolet (UV)light. The composite catalyst exhibited higher photocatalytic activity than that of TiO2. When 300 mg·L−1, the initial pH was 11, the catalyst concentration was 1.5 g·L−1, the loading level of Cu-H3PW12O40 was 40%, the aeration rate was 1.5 L·min−1, and lastly the removal rateof NH4+/NH3 by the composite photocatalyst could reach >80%. Very little NO2− and NO3− were produced, and N2 was the main product.