Co-modification of graphitic carbon nitride(g-C_(3)N_(4))photocatalysts can maximally optimize their intrinsic photoelectric structures,but usually involves complex multistep reactions,and thus is challenging because ...Co-modification of graphitic carbon nitride(g-C_(3)N_(4))photocatalysts can maximally optimize their intrinsic photoelectric structures,but usually involves complex multistep reactions,and thus is challenging because structural collapse and active site decay usually happen due to the complex process,over-treatment or conflict of different modification strategies.In this work,potassium iodate(KIO_(3)),an edible salt additive,was used as a critical waste-free modifier in the thermal polymerization of g-C_(3)N_(4),leading to a fast and coordinated co-modification of g-C_(3)N_(4) photocatalysts.The final g-CN-KIO_(3) photocatalyst demonstrated a superior and balanced optical absorption ability and semiconductor band structure.In visible-light-driven photocatalytic model tests,g-CN-KIO_(3) showed a 3.25 times higher Cr(VI)photoreduction rate and five orders of magnitude lower residual bacteria in a photocatalytic sterilization within 120 min compared with raw g-C_(3)N_(4).The photocatalytic performance of g-CN-KIO_(3) also outperformed all of the controls without maximized K-I-O co-modification(CN-K,CN-I,CN-O,and CN-KI).Photocurrent and electrochemical impedance experiments suggest that the co-modified photocatalysts have a faster charge separation ability,which is attributed to the multiple K-I-O co-modifications inducing an optimized surface electronic structure and slower carrier recombination.This work provides a new way to simplify and coordinate complex multi-factor regulation of materials.展开更多
基金financed by the National Natural Science Foundation of China(grant no.51671136,12175035 and 11705115).
文摘Co-modification of graphitic carbon nitride(g-C_(3)N_(4))photocatalysts can maximally optimize their intrinsic photoelectric structures,but usually involves complex multistep reactions,and thus is challenging because structural collapse and active site decay usually happen due to the complex process,over-treatment or conflict of different modification strategies.In this work,potassium iodate(KIO_(3)),an edible salt additive,was used as a critical waste-free modifier in the thermal polymerization of g-C_(3)N_(4),leading to a fast and coordinated co-modification of g-C_(3)N_(4) photocatalysts.The final g-CN-KIO_(3) photocatalyst demonstrated a superior and balanced optical absorption ability and semiconductor band structure.In visible-light-driven photocatalytic model tests,g-CN-KIO_(3) showed a 3.25 times higher Cr(VI)photoreduction rate and five orders of magnitude lower residual bacteria in a photocatalytic sterilization within 120 min compared with raw g-C_(3)N_(4).The photocatalytic performance of g-CN-KIO_(3) also outperformed all of the controls without maximized K-I-O co-modification(CN-K,CN-I,CN-O,and CN-KI).Photocurrent and electrochemical impedance experiments suggest that the co-modified photocatalysts have a faster charge separation ability,which is attributed to the multiple K-I-O co-modifications inducing an optimized surface electronic structure and slower carrier recombination.This work provides a new way to simplify and coordinate complex multi-factor regulation of materials.
