CoPc-PCN heterojunction activating PMS by efficient interfacial charge transfer for tetracycline degradation
Phosphorus-doped graphite phase carbon nitride(g-C3N4)nanosheets(PCN)were prepared from high temperature phosphating of urea and sodium hypophosphite anhydrous.Then,the PCN was calcined with cobalt phthalocyanine(CoPc)in a muffle furnace to construct CoPc-PCN heterojunction(hereinafter referred to as Co-PCN).The samples obtained were characterized by XRD,FTIR,SEM,TEM,HAADF-STEM,XPS and UV-Vis DRS.The performance of CoPc-PCN heterojunction on activation of peroxomonosulfate(PMS)for tetracycline(TC)degradation was further evaluated.The results showed that the construction of heterojunction extended the light absorption edge to the visible light region,and made the degradation rate of TC(mass concentration of 10 mg/L)reached 98.8%after 40 min in 50 mL solution activated by 20 mg 5%Co-PCN(5%is the percentage of CoPc mass to PCN mass)and 30 mg PMS,with a degradation rate constant of 0.087 min-1.The heterojunction barrier at the interface between PCN and CoPc accelerated the separation of photogenerated electron/hole,while the strong interface interaction also provided a channel for electron transfer,mainly the reduction of O2 to generate large amounts of·O2-,and the activation of PMS to produce·O2-·SO4-and·OH to degrade TC.
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