Hollow 3D rGO/P-HC/TiO₂ for Photocatalytic Degradation of Ammonia Nitrogen

In this work,a series of catalyst were successfully fabricated via hydrothermal method,which were used as efficient UV light photocatalytic degradation of ammonia nitrogen from aqueous solution.The surface properties of the catalysts were characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD）,the Brunauer-Emmett-Teller（BET） method and UV-vis-DRS spectroscopy（DRS） technique.The comparison of photocatalytic performance among HC,P-HC,rGO/P-HC,TiO₂,P-HC/TiO₂,rGO/TiO₂ and rGO/P-HC/TiO₂ was carried out.The influences of the dosage of catalyst,the solution p H and ammonia nitrogen concentration on the degradation process were also investigated.It is shown that the ammonia nitrogen removal rate first increases and then decreases with the increase of catalyst dosage.And the removal rate reaches the highest at p H = 8. The as-prepared rGO/P-HC/TiO₂ catalyst shows a much higher photocatalytic activity for degradation of ammonia nitrogen than other catalysts,with the removal efficiency reached 93.0%.In cycle availability experiments,the rGO/P-HC/TiO₂ exhibits outstanding recycle activity and stability in ammonia nitrogen oxidation reaction under UV and sun light.The prepared catalysts are promising for the degradation of ammonia nitrogen from water resource.