Building step-scheme(S-scheme)heterojunctions is newly emerging as an efficient means to obtain excellent photocatalysts for water pollution control.Herein,a 2D/0D S-scheme heterojunction of C_(3)N_(5)/Bi_(2)WO_(6) wa...Building step-scheme(S-scheme)heterojunctions is newly emerging as an efficient means to obtain excellent photocatalysts for water pollution control.Herein,a 2D/0D S-scheme heterojunction of C_(3)N_(5)/Bi_(2)WO_(6) was synthesized by in situ growing 0D Bi_(2)WO_(6) nanodots on 2D C_(3)N_(5) nanosheets.Photocatalytic removal of tetracycline(TC)and Cr(VI)from water was employed to evaluate the activity of C_(3)N_(5)/Bi_(2)WO_(6) under visible light compared to that of C_(3)N_(5),Bi_(2)WO_(6),and their mechanical mixture.Obviously,C_(3)N_(5)/Bi_(2)WO_(6) is much more active in the visible-light-driven removal of TC and Cr(VI),indicating strong interaction between the C_(3)N_(5) nanosheets and Bi_(2)WO_(6) nanodots as a result of in situ growth.Such an interaction can be illustrated as the S-scheme transfer behavior of photogenerated electrons and holes,which boosts the interfacial charge separation,retains the optimum redox ability of photo-induced charge carriers and fosters the generation of more active species.Moreover,C_(3)N_(5)/Bi_(2)WO_(6) shows more structural defects than single C_(3)N_(5) and single Bi_(2)WO_(6),which may endow C_(3)N_(5)/Bi_(2)WO_(6) with better ability in the activation and photo-oxidation of TC as well as the activation and photo-reduction of Cr(VI).In a nutshell,this work affords a deep understanding of the photocatalytic mechanism based on C_(3)N_(5)/Bi_(2)WO_(6) as well as presents a new concept for developing highly efficient S-scheme heterojunction photocatalysts for water decontamination.展开更多
基金supported by the Natural Science Foundation of Zhejiang Province(LY20E080014)the Science and Technology Project of Zhoushan(2022C41011,2020C21009)+1 种基金the National Natural Science Foundation of China(51708504)the support from the Fundamental Research Funds for the Central Universities(D5000210671).
文摘Building step-scheme(S-scheme)heterojunctions is newly emerging as an efficient means to obtain excellent photocatalysts for water pollution control.Herein,a 2D/0D S-scheme heterojunction of C_(3)N_(5)/Bi_(2)WO_(6) was synthesized by in situ growing 0D Bi_(2)WO_(6) nanodots on 2D C_(3)N_(5) nanosheets.Photocatalytic removal of tetracycline(TC)and Cr(VI)from water was employed to evaluate the activity of C_(3)N_(5)/Bi_(2)WO_(6) under visible light compared to that of C_(3)N_(5),Bi_(2)WO_(6),and their mechanical mixture.Obviously,C_(3)N_(5)/Bi_(2)WO_(6) is much more active in the visible-light-driven removal of TC and Cr(VI),indicating strong interaction between the C_(3)N_(5) nanosheets and Bi_(2)WO_(6) nanodots as a result of in situ growth.Such an interaction can be illustrated as the S-scheme transfer behavior of photogenerated electrons and holes,which boosts the interfacial charge separation,retains the optimum redox ability of photo-induced charge carriers and fosters the generation of more active species.Moreover,C_(3)N_(5)/Bi_(2)WO_(6) shows more structural defects than single C_(3)N_(5) and single Bi_(2)WO_(6),which may endow C_(3)N_(5)/Bi_(2)WO_(6) with better ability in the activation and photo-oxidation of TC as well as the activation and photo-reduction of Cr(VI).In a nutshell,this work affords a deep understanding of the photocatalytic mechanism based on C_(3)N_(5)/Bi_(2)WO_(6) as well as presents a new concept for developing highly efficient S-scheme heterojunction photocatalysts for water decontamination.
