Introducing vacancies and constructing S-scheme heterojunctions are promising approaches for enhancing photocatalytic activity.However,the application of this synergistic strategy to realize inexpensive and efficient ...Introducing vacancies and constructing S-scheme heterojunctions are promising approaches for enhancing photocatalytic activity.However,the application of this synergistic strategy to realize inexpensive and efficient photocatalysts remains challenging.In this study,a straightforward hydrothermal and calcination modification strategy was used to prepare a photocatalyst in which abundant nitrogen-oxygen vacancies were coupled with a Ce-ZnO@C-g-C_(3)N_(4)composite with an S-scheme heterojunction.Under sunlight irradiation,the prepared composite achieves 98.3%and 86.4%degradation of methylene blue and ciprofloxacin,with degradation rate constants of 0.3464 and 0.0893 min^(-1),respectively.Compared with ZnO and g-C_(3)N_(4),the degradation rates of methylene blue over the composite catalyst are 34.8 and 22.7 times higher,respectively,and those of ciprofloxacin are 2.4 and 4.9 times higher,respectively.Based on a detailed examination of the catalyst structure and photoelectric properties,the high photocatalytic efficiency is attributed to nitrogen-oxygen vacancies,an enhanced surface area,and synergistic S-scheme heterojunction effects.These factors broaden the spectral range,increase the number of active sites,and facilitate efficient charge transfer,thereby enhancing the photocatalytic reaction.This system demonstrates the feasibility of integrating doping and heterojunction formation to enhance photocatalytic performance synergistically.展开更多
Copper nanowires were synthesized by the wet chemical reduction method using copper sulfate as the copper precursor,aliphatic amines(methylamine,ethanediamine,1,2-propanediamine)as the inducing reagents,and hydrazine ...Copper nanowires were synthesized by the wet chemical reduction method using copper sulfate as the copper precursor,aliphatic amines(methylamine,ethanediamine,1,2-propanediamine)as the inducing reagents,and hydrazine hydrate as the reductant through the aging and reduction processes.The high-resolution transmission electron microscopy(HRTEM)images reveal that the copper nanowires were synthesized by coalescing extremely small-sized copper nanoparticles with the particle sizes of1–6 nm in copper complex micelles.A longer aging time period favored the coalescing of the copper nanoparticles to form thinner copper nanowires in the following reduction process.The coalescing extent of copper nanoparticles in copper nanowires was highly enhanced by ethanediamine and 1,2-propanediamine as compared with that by methylamine.The copper nanowire-filled polyester films had higher electrical conductivity than the copper nanoparticle-filled ones.展开更多
基金Project supported by the Bingtuan Science and Technology Program(2024DA036,2022ZD099)。
文摘Introducing vacancies and constructing S-scheme heterojunctions are promising approaches for enhancing photocatalytic activity.However,the application of this synergistic strategy to realize inexpensive and efficient photocatalysts remains challenging.In this study,a straightforward hydrothermal and calcination modification strategy was used to prepare a photocatalyst in which abundant nitrogen-oxygen vacancies were coupled with a Ce-ZnO@C-g-C_(3)N_(4)composite with an S-scheme heterojunction.Under sunlight irradiation,the prepared composite achieves 98.3%and 86.4%degradation of methylene blue and ciprofloxacin,with degradation rate constants of 0.3464 and 0.0893 min^(-1),respectively.Compared with ZnO and g-C_(3)N_(4),the degradation rates of methylene blue over the composite catalyst are 34.8 and 22.7 times higher,respectively,and those of ciprofloxacin are 2.4 and 4.9 times higher,respectively.Based on a detailed examination of the catalyst structure and photoelectric properties,the high photocatalytic efficiency is attributed to nitrogen-oxygen vacancies,an enhanced surface area,and synergistic S-scheme heterojunction effects.These factors broaden the spectral range,increase the number of active sites,and facilitate efficient charge transfer,thereby enhancing the photocatalytic reaction.This system demonstrates the feasibility of integrating doping and heterojunction formation to enhance photocatalytic performance synergistically.
基金financially supported by the fund from the Jiangsu Science and Technology Department,China(FZ20180919)。
文摘Copper nanowires were synthesized by the wet chemical reduction method using copper sulfate as the copper precursor,aliphatic amines(methylamine,ethanediamine,1,2-propanediamine)as the inducing reagents,and hydrazine hydrate as the reductant through the aging and reduction processes.The high-resolution transmission electron microscopy(HRTEM)images reveal that the copper nanowires were synthesized by coalescing extremely small-sized copper nanoparticles with the particle sizes of1–6 nm in copper complex micelles.A longer aging time period favored the coalescing of the copper nanoparticles to form thinner copper nanowires in the following reduction process.The coalescing extent of copper nanoparticles in copper nanowires was highly enhanced by ethanediamine and 1,2-propanediamine as compared with that by methylamine.The copper nanowire-filled polyester films had higher electrical conductivity than the copper nanoparticle-filled ones.
