Development of Heterojunction C-TiO2/g-C3N4 as New Photocatalysts for Degradation of Antibiotics Pollutant in Aquesous Environment

C-TiO2 was effectively hybridized with g-C3N4 in the varies mass ratio of C-TiO2/g-C3N4 (10, 20, 30 và 40%) to highly improve its photocatalytic activity for degradation of tetracycline (TC). The prepared samples were characterized by X-ray diffraction (XRD), Ultraviolet–visible absorption spectroscopy (UV-Vis DRS), Photoluminescence (PL) and Energy dispersive X-ray spectroscopy (EDX). As compared with C-TiO2 and g-C3N4, the decoration of C-TiO2 on g-C3N4 led to formation of C-TiO2/g-C3N4 heterojunction to effectively prevent the charge recombination in each material and exhibit great increases in visible light adsorption. The obtained PL and UV-Vis DRS indecated C-TiO2/g-C3N4 material, which the C-TiO2:g-C3N4 mass ratio was 20% showed the strongest tetracycline degradation efficiency (84.24%). With the further increasing in C-TiO2 content in C-TiO2/g-C3N4, photocatalytic degradation efficiency decreased. This was because the excessed C-TiO2 hindered optical absorption for electron-hole separation of g-C3N4 and the excessed C-TiO2 decorating on the surface g-C3N4 could also act as centers for electron-hole recombination leading to decrease photocatalytic degradation efficiency of the C-TiO2/g-C3N4.