SiO2@g-C3 N4 Core-shell nanospheres and Ag/AgCl/SiO2@g-C3N4 composites were synthe-sized by hard template method,their structure and optical properties were characterized.The performance and mechanism of visible light photocatalytic degradation of ofloxacin(OFX)were investigated.The results showed g-C3 N4 is coated on the surface of SiO2 nanospheres,most of them are spheres with a diam-eter of 400 nm.The addition of Ag/AgCl constructs a heterojunction and significantly improves the separa-tion efficiency of photogenerated carriers.Compared with pure g-C3 N4,the photocatalytic degradation of ofloxacin by Ag/AgCl/SiO2@g-C3N4 composites was significantly improved.When the initial concentra-tion of OFX is 10 mg/L,the catalyst dosage is 0.2 g/L,and the degradation rate of OFX can reach 72.59％after 40 min of visible light irradiation at 100 mW/cm2.Free radical quenching experiments showed that the main active substance in the photocatalytic degradation of pollutants by Ag/AgCl/SiO2@g-C3N4 composite was photogenerated holes.
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