A photo-Fenton system based on the polymer semiconductor g-C_(3)N_(4)is an important practical visible-light-driven advanced oxidation catalyst with high efficiency and low cost.However,the lack of primaryphotocatalyt...A photo-Fenton system based on the polymer semiconductor g-C_(3)N_(4)is an important practical visible-light-driven advanced oxidation catalyst with high efficiency and low cost.However,the lack of primaryphotocatalytic active sites on g-C_(3)N_(4)and the difficulty in the uniform loading of Fenton-like iron com-ponents on g-C_(3)N_(4)decrease the performance and stability of g-C_(3)N_(4)-based photo-Fenton catalysts.Surface defect engineering,an effective strategy to enhance the photocatalytic active sites of g-C_(3)N_(4),can improve the performances of g-C_(3)N_(4)-based photo-Fenton systems.In this work,a highly-efficientphoto-Fenton catalyst with a porous structure and cyano group defects was successfully prepared by asimple one-step thermal polymerization using ferrate as a critical iron source and defect control additive.A heterogeneous photocatalysis-Fenton tetracycline degradation experiment was conducted with theaddition of H_(2)O_(2)under visible light irradiation.The as-developed CN-Fe 0.10 exhibits an 8.3 times higherremoval rate than single photocatalysts,and high recycling stability.Systematic material and electro-chemical characterization studies demonstrated that the ferrate-induced photo-Fenton system realizedideal coordination of the Fe-N_(x) coupling structure and multiple defects(intercalation defect,mesoporousdefect,cyano group defect),and thus improved the separation of photogenerated charge carriers andsped up the interfacial reaction.These findings provide a new idea for smart and accurate regulation ofg-C_(3)N_(4)defects and g-C_(3)N_(4)-based complex catalysis systems using novel green reagents.展开更多
基金financed by the National Natural Science Foundation of China(grant no.51671136).
文摘A photo-Fenton system based on the polymer semiconductor g-C_(3)N_(4)is an important practical visible-light-driven advanced oxidation catalyst with high efficiency and low cost.However,the lack of primaryphotocatalytic active sites on g-C_(3)N_(4)and the difficulty in the uniform loading of Fenton-like iron com-ponents on g-C_(3)N_(4)decrease the performance and stability of g-C_(3)N_(4)-based photo-Fenton catalysts.Surface defect engineering,an effective strategy to enhance the photocatalytic active sites of g-C_(3)N_(4),can improve the performances of g-C_(3)N_(4)-based photo-Fenton systems.In this work,a highly-efficientphoto-Fenton catalyst with a porous structure and cyano group defects was successfully prepared by asimple one-step thermal polymerization using ferrate as a critical iron source and defect control additive.A heterogeneous photocatalysis-Fenton tetracycline degradation experiment was conducted with theaddition of H_(2)O_(2)under visible light irradiation.The as-developed CN-Fe 0.10 exhibits an 8.3 times higherremoval rate than single photocatalysts,and high recycling stability.Systematic material and electro-chemical characterization studies demonstrated that the ferrate-induced photo-Fenton system realizedideal coordination of the Fe-N_(x) coupling structure and multiple defects(intercalation defect,mesoporousdefect,cyano group defect),and thus improved the separation of photogenerated charge carriers andsped up the interfacial reaction.These findings provide a new idea for smart and accurate regulation ofg-C_(3)N_(4)defects and g-C_(3)N_(4)-based complex catalysis systems using novel green reagents.
