Elemental doping is an effective strategy for tuning the band structure of graphite carbon nitride(CN)to enhance its photocatalytic performance.In this study,sodium(Na)and oxygen(O)co-doped carbon nitride(Na/O-CN_(x),...Elemental doping is an effective strategy for tuning the band structure of graphite carbon nitride(CN)to enhance its photocatalytic performance.In this study,sodium(Na)and oxygen(O)co-doped carbon nitride(Na/O-CN_(x),x=1.0,2.0,3.0,4.0)was synthesized via solid-phase reaction of sodium citrate(NaCA)and pure CN powder in the Teflon-sealed autoclave under air conditions at 180℃.Surface area of Na/O-CN_(3.0) is measured to be 18.8 m^(2)/g,increasing by 60.7%compared to that of pure CN(11.7 m^(2)/g).Bandgap energy of Na/O-CN_(3.0) is determined to be 2.68 eV,marginally lower than that of pure CN(2.70 eV),thereby enhancing its capacity for sunlight absorption.Meanwhile,the incorporation of Na and O atoms into Na/O-CN_(x) is found to effectively reduce recombination rates of photogenerated electron-hole pairs.As a result,Na/O-CN_(x) samples exhibit markedly enhanced photocatalytic hydrogen evolution activity under visible light irradiation.Notably,the optimal Na/O-CN_(3.0) sample achieves a photocatalytic hydrogen production rate of 103.2μmol·g^(–1)·h^(–1),which is 8.2 times greater than that of pure CN(11.2μmol·g^(–1)·h^(–1)).Furthermore,a series of Na/O-CN_(x)-yO_(2)(y=0,20%,40%,60%,80%,100%)samples were prepared by modulating the oxygen content within reaction atmosphere.The catalytic performance evaluations reveal that the incorporation of both Na and O atoms in Na/O-CN_(3.0) enhances photocatalytic activity.This study also introduces novel methodologies for synthesis of metal atom-doped CN materials at lower temperature,highlighting the synergistic effect of Na and O atoms in photocatalytic hydrogen production of Na/O-CN_(x) samples.展开更多
通过对不同来源的桑黄菌株进行分子鉴定和遗传多样性分析,为后续桑黄种质资源的研究、开发及利用提供参考。采用r DNA ITS序列分析技术,对收集到的国内22个桑黄菌株进行分子鉴定与遗传多样性分析。依据r DNA ITS序列计算遗传距离并构建...通过对不同来源的桑黄菌株进行分子鉴定和遗传多样性分析,为后续桑黄种质资源的研究、开发及利用提供参考。采用r DNA ITS序列分析技术,对收集到的国内22个桑黄菌株进行分子鉴定与遗传多样性分析。依据r DNA ITS序列计算遗传距离并构建系统发育树,结果显示收集到的桑黄菌株明确聚为3个独立类群,且3个类群的桑黄真菌存在明显的遗传分化。通过BLAST分析,成功鉴定出3类桑黄种质分别为:桑树桑黄(Sanghuangporus sanghuang)、杨树桑黄(Fuscoporia gilva)及丁香桑黄(Inonotus baumii)。不同来源的桑黄菌株间具有一定的遗传多样性,种间遗传趋异度显著高于种内。本研究结果提供了一种准确可靠且简单易行的桑黄真菌分子鉴定技术,可明确各桑黄真菌的种属来源及遗传结构组成,为桑黄真菌的进一步研究及开发应用奠定了基础。展开更多
基金National Natural Science Foundation of China(21806023)Natural Science Foundation of Hunan Province(2021JJ40199)+2 种基金Education Department Foundation of Hunan Province(20C0813)Hunan University of Science and Technology Fundamental Research FundsPostgraduate Scientific Research Innovation Project of Hunan Province(CX20240877)。
文摘Elemental doping is an effective strategy for tuning the band structure of graphite carbon nitride(CN)to enhance its photocatalytic performance.In this study,sodium(Na)and oxygen(O)co-doped carbon nitride(Na/O-CN_(x),x=1.0,2.0,3.0,4.0)was synthesized via solid-phase reaction of sodium citrate(NaCA)and pure CN powder in the Teflon-sealed autoclave under air conditions at 180℃.Surface area of Na/O-CN_(3.0) is measured to be 18.8 m^(2)/g,increasing by 60.7%compared to that of pure CN(11.7 m^(2)/g).Bandgap energy of Na/O-CN_(3.0) is determined to be 2.68 eV,marginally lower than that of pure CN(2.70 eV),thereby enhancing its capacity for sunlight absorption.Meanwhile,the incorporation of Na and O atoms into Na/O-CN_(x) is found to effectively reduce recombination rates of photogenerated electron-hole pairs.As a result,Na/O-CN_(x) samples exhibit markedly enhanced photocatalytic hydrogen evolution activity under visible light irradiation.Notably,the optimal Na/O-CN_(3.0) sample achieves a photocatalytic hydrogen production rate of 103.2μmol·g^(–1)·h^(–1),which is 8.2 times greater than that of pure CN(11.2μmol·g^(–1)·h^(–1)).Furthermore,a series of Na/O-CN_(x)-yO_(2)(y=0,20%,40%,60%,80%,100%)samples were prepared by modulating the oxygen content within reaction atmosphere.The catalytic performance evaluations reveal that the incorporation of both Na and O atoms in Na/O-CN_(3.0) enhances photocatalytic activity.This study also introduces novel methodologies for synthesis of metal atom-doped CN materials at lower temperature,highlighting the synergistic effect of Na and O atoms in photocatalytic hydrogen production of Na/O-CN_(x) samples.
文摘通过对不同来源的桑黄菌株进行分子鉴定和遗传多样性分析,为后续桑黄种质资源的研究、开发及利用提供参考。采用r DNA ITS序列分析技术,对收集到的国内22个桑黄菌株进行分子鉴定与遗传多样性分析。依据r DNA ITS序列计算遗传距离并构建系统发育树,结果显示收集到的桑黄菌株明确聚为3个独立类群,且3个类群的桑黄真菌存在明显的遗传分化。通过BLAST分析,成功鉴定出3类桑黄种质分别为:桑树桑黄(Sanghuangporus sanghuang)、杨树桑黄(Fuscoporia gilva)及丁香桑黄(Inonotus baumii)。不同来源的桑黄菌株间具有一定的遗传多样性,种间遗传趋异度显著高于种内。本研究结果提供了一种准确可靠且简单易行的桑黄真菌分子鉴定技术,可明确各桑黄真菌的种属来源及遗传结构组成,为桑黄真菌的进一步研究及开发应用奠定了基础。
