Graphite-phase carbon nitride was modified by metal loading to obtain cobalt photo-catalyst supported on graphite-phase carbon nitride(Co/g-C3N4).The prepared catalysts were characterized using electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,UV-visible diffuse reflectance spectroscopy,photoluminescence spectroscopy,and photoelec-trochemical testing.The effectiveness of photocatalytic degradation of tetracycline hydrochlo-ride(TC)over Co/g-C3N4 was investigated through a photocatalytic evaluation system,and so did the effects and the mechanism of different catalyst inputs,pollutant concentrations,and other factors on the photocatalytic degradation of TC by Co/g-C3N4.The results showed that the loading of metal cobalt further improved the separation efficiency of electron-hole pairs in graphite-phase carbon nitride,and enhanced the photocatalytic activity of the catalyst.Further-more,it did not change the crystal structure and surface morphology of graphite-phase carbon nitride after cobalt loading.The removal quantity of TC over 1％Co/g-C3N4 under visible light can reach 95.68％within 120 minutes.The removal rate of TC is 2.3 times that of pure g-C3N4 Catalysis.The photocatalytic degradation efficiency of TC after five catalytic cycles was above 80％,indicating good stability and recyclability.It was found that holes and hydroxyl radicals were the main active sub-stances in the photocatalytic reaction.
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