Photocatalytic method has been intensively explored for Cr(VI)reduction owing to its efficient and environmentally friendly natures.In order to obtain a high efficiency in practical application,efficient photocatalyst...Photocatalytic method has been intensively explored for Cr(VI)reduction owing to its efficient and environmentally friendly natures.In order to obtain a high efficiency in practical application,efficient photocatalysts need to be developed.Here,ZnIn2S4/SnS2 with a three-dimensional(3D)heterostructure was prepared by a hydrothermal method and its photocatalytic performance in Cr(VI)reduction was investigated.When the mass ratio of SnS2 to ZnIn2S4 is 1:10,the ZnIn2S4/SnS2 composite exhibits the highest photocatalytic activity with 100%efficiency for Cr(VI)(50 mg/L)reduction within 70 min under visible-light irradiation,which is much higher than those of pure ZnIn2S4 and SnS2.The enhanced charge separation and the light absorption have been confirmed from the photoluminescence and UV-vis absorption spectra to be the two reasons for the increased activity towards photocatalytic Cr(VI)reduction.In addition,after three cycles of testing,no obvious degradation is observed with the 3D heterostructured ZnIn2S4/SnS2,which maintains a good photocatalytic stability.展开更多
Doping engineering is an effective strategy for graphitic carbon nitride(g-C_(3)N_(4))to improve its photocat-alytic hydrogen evolution reaction(HER)performance.In this work,a novel nitrogen and sulfur co-doped g-C_(3...Doping engineering is an effective strategy for graphitic carbon nitride(g-C_(3)N_(4))to improve its photocat-alytic hydrogen evolution reaction(HER)performance.In this work,a novel nitrogen and sulfur co-doped g-C_(3)N_(4)(N,S-g-C_(3)N_(4))is elaborately designed on the basis of theoretical predictions of first-principle density functional theory(DFT).The calculated Gibbs free energy of adsorbed hydrogen(ΔGH∗)for N,S-g-C_(3)N_(4) at the N-doping active sites is extremely close to zero(0.01 eV).Inspired by the theoretical predictions,the N,S-g-C_(3)N_(4) is successfully fabricated through ammonia-rich pyrolysis synthesis strategy,in which ammonia is in-situ obtained by pyrolyzing melamine.Subsequent characterizations indicate that the N,S-g-C_(3)N_(4) possesses high specific surface area,outstanding light utilization,good hydrophilicity,and efficient carrier transfer efficiency.Consequently,the N,S-g-C_(3)N_(4) displays an extremely high H2 evolution rate of 8269.9μmol g−1 h−1,achieves an apparent quantum efficiency(AQE)of 3.24%,and also possesses outsatnding durability.Theoretical calculations further demonstrate that N and S dopants can not only introduce doping energy level to reduce the band gap,but also induce charge redistribution to facilitate hydrogen adsorption,thus promoting the photocatalytic HER process.Moreover,femtosecond transient absorption(fs-TA)spectroscopy further corroborates the efficient photogenerated carrier transport of N,S-g-C_(3)N_(4).This research highlights a promising and reliable strategy to achieve superior photocatalytic activity,and exhibits significant guidance for precise designing high-efficiency photocatalysts.展开更多
Parkinson's disease(PD)is one of the most common neurodegenerative diseases.The loss of dopaminergic(DAergic)neurons in the substantia nigra and the decrease of dopamine(DA)levels accelerate the process of PD.L-Er...Parkinson's disease(PD)is one of the most common neurodegenerative diseases.The loss of dopaminergic(DAergic)neurons in the substantia nigra and the decrease of dopamine(DA)levels accelerate the process of PD.L-Ergothioneine(EGT)is a natural antioxidant derived from microorganisms,especially in edible mushrooms.EGT can penetrate blood-brain barrier and its levels are significantly decreased in the plasma of PD patients.Therefore,we speculated that EGT could ameliorate PD,and determined its effect on PD development by using 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-induced PD mouse models and neurotoxin 1-methyl-4-phenylpyridinium(MPP^(+))-induced cell models.Our results show that EGT alleviated MPTP-induced behavioral dysfunction in mice.Mechanistically,we innovatively revealed that EGT was a key regulator of DJ-1.EGT restored DA levels by activating the DJ-1-nuclear receptor-related factor 1(Nurr1)axis.Furthermore,it reduced reactive oxygen species(ROS)levels by regulating the DJ-1-nuclear factor erythroid 2-related factor 2(Nrf2)pathway,which inhibited oxidative stress-induced DAergic neuronal apoptosis.Combined treatment with DJ-1-si RNA transfection revealed that blocking DJ-1 reversed EGT upregulated Nurr1 and Nrf2 expression in the nucleus,which significantly decreased the benefits of EGT.Taken together,our study suggests that EGT can ameliorate PD and be considered as a strategy for PD treatment.展开更多
Exploiting high-performance electrolyte holds the key for realization practical application of rechargeable magnesium batteries(RMBs).Herein,a new non-nucleophilic mononuclear electrolyte was developed and its electro...Exploiting high-performance electrolyte holds the key for realization practical application of rechargeable magnesium batteries(RMBs).Herein,a new non-nucleophilic mononuclear electrolyte was developed and its electrochemical active species was identified as[Mg(DME)_(3)][GaCl_(4)]_(2) through single-crystal X-ray diffraction analysis.The as-synthesized Mg(GaCl_(4))_(2)-IL-DME electrolyte could achieve a high ionic conductivity(9.85 m S cm^(-1)),good anodic stability(2.9 V vs.Mg/Mg^(2+)),and highly reversible Mg plating/stripping.The remarkable electrochemical performance should be attributed to the in-situ formation of Mg^(2+)-conducting Ga_(5)Mg_(2)alloy layer at the Mg/electrolyte interface during electrochemical cycling,which not only efficiently protects the Mg anode from passivation,but also allows for rapid Mg-ion transport.Significantly,the Mg(GaCl_(4))_(2)-IL-DME electrolyte showed excellent compatibility with both conversion and intercalation cathodes.The Mg/S batteries with Mg(Ga Cl_(4))_(2)-IL-DME electrolyte and KB/S cathode showed a high specific capacity of 839 m Ah g^(-1)after 50 cycles at 0.1 C with the Coulombic efficiency of~100%.Moreover,the assembled Mg|Mo_6 S_8 batteries delivered a reversible discharge capacity of 85 m Ah g^(-1)after 120 cycles at 0.2 C.This work provides a universal electrolyte for the realization of high-performance and practical RMBs,especially Mg/S batteries.展开更多
The industrial implementation of Solar-driven photocatalysis is hampered by inefficient charge separation,poor reusability and hard retrieval of powdery catalysts.To conquer these drawbacks,a self-floating S-scheme Bi...The industrial implementation of Solar-driven photocatalysis is hampered by inefficient charge separation,poor reusability and hard retrieval of powdery catalysts.To conquer these drawbacks,a self-floating S-scheme Bi_(4)O_(5)Br_(2)/P-doped C_(3)N_(4)/carbon fiber cloth(BB/PN/CC)composed of carbon fibers(CC)as the core and Bi_(4)O_(5)Br_(2)/P-doped C_(3)N_(4)(BB/PN)nanosheets as the shell was constructed as a competent,recyclable cloth-shaped photocatalyst for safe and efficient degradation of aquacultural antibiotics.The BB/PN/CC fabric achieves an exceptional tetracycline degradation rate constant of 0.0118 min‒1,surpassing CN/CC(0.0015 min^(‒1)),BB/CC(0.0066 min^(‒1))and PN/CC(0.0023 min^(‒1))by 6.9,0.8 and 4.1 folds,respectively.Beyond its catalytic prowess,the photocatalyst’s practical superiority is evident in its effortless recovery and environmental adaptability.The superior catalytic effectiveness stems from the S-scheme configuration,which retains the maximum redox capacities of the constituent BB and PN while enabling efficient spatial detachment of photo-carriers.X-ray photoelectron spectroscopy(XPS),in-situ XPS,and electron paramagnetic resonance analyses corroborate the S-scheme mechanism,revealing electron accumulation on PN and hole retention on BB under illumination.Density functional theory calculations further confirm S-scheme interfacial charge redistribution and internal electric field formation.This study advances the design of macroscopic S-scheme heterojunction photocatalysts for sustainable water purification.展开更多
基金the support of the National Natural Science Foundation of China (51702087 and 21673066)~~
文摘Photocatalytic method has been intensively explored for Cr(VI)reduction owing to its efficient and environmentally friendly natures.In order to obtain a high efficiency in practical application,efficient photocatalysts need to be developed.Here,ZnIn2S4/SnS2 with a three-dimensional(3D)heterostructure was prepared by a hydrothermal method and its photocatalytic performance in Cr(VI)reduction was investigated.When the mass ratio of SnS2 to ZnIn2S4 is 1:10,the ZnIn2S4/SnS2 composite exhibits the highest photocatalytic activity with 100%efficiency for Cr(VI)(50 mg/L)reduction within 70 min under visible-light irradiation,which is much higher than those of pure ZnIn2S4 and SnS2.The enhanced charge separation and the light absorption have been confirmed from the photoluminescence and UV-vis absorption spectra to be the two reasons for the increased activity towards photocatalytic Cr(VI)reduction.In addition,after three cycles of testing,no obvious degradation is observed with the 3D heterostructured ZnIn2S4/SnS2,which maintains a good photocatalytic stability.
基金supported by the National Natural Science Foun-dation of China(No.62004143)the Key R&D Program of Hubei Province(No.2022BAA084)the Natural Science Foundation of Hubei Province(No.2021CFB133).
文摘Doping engineering is an effective strategy for graphitic carbon nitride(g-C_(3)N_(4))to improve its photocat-alytic hydrogen evolution reaction(HER)performance.In this work,a novel nitrogen and sulfur co-doped g-C_(3)N_(4)(N,S-g-C_(3)N_(4))is elaborately designed on the basis of theoretical predictions of first-principle density functional theory(DFT).The calculated Gibbs free energy of adsorbed hydrogen(ΔGH∗)for N,S-g-C_(3)N_(4) at the N-doping active sites is extremely close to zero(0.01 eV).Inspired by the theoretical predictions,the N,S-g-C_(3)N_(4) is successfully fabricated through ammonia-rich pyrolysis synthesis strategy,in which ammonia is in-situ obtained by pyrolyzing melamine.Subsequent characterizations indicate that the N,S-g-C_(3)N_(4) possesses high specific surface area,outstanding light utilization,good hydrophilicity,and efficient carrier transfer efficiency.Consequently,the N,S-g-C_(3)N_(4) displays an extremely high H2 evolution rate of 8269.9μmol g−1 h−1,achieves an apparent quantum efficiency(AQE)of 3.24%,and also possesses outsatnding durability.Theoretical calculations further demonstrate that N and S dopants can not only introduce doping energy level to reduce the band gap,but also induce charge redistribution to facilitate hydrogen adsorption,thus promoting the photocatalytic HER process.Moreover,femtosecond transient absorption(fs-TA)spectroscopy further corroborates the efficient photogenerated carrier transport of N,S-g-C_(3)N_(4).This research highlights a promising and reliable strategy to achieve superior photocatalytic activity,and exhibits significant guidance for precise designing high-efficiency photocatalysts.
基金supported by the National Natural Science Foundation of China(U22A20272,82173807,82170497)。
文摘Parkinson's disease(PD)is one of the most common neurodegenerative diseases.The loss of dopaminergic(DAergic)neurons in the substantia nigra and the decrease of dopamine(DA)levels accelerate the process of PD.L-Ergothioneine(EGT)is a natural antioxidant derived from microorganisms,especially in edible mushrooms.EGT can penetrate blood-brain barrier and its levels are significantly decreased in the plasma of PD patients.Therefore,we speculated that EGT could ameliorate PD,and determined its effect on PD development by using 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-induced PD mouse models and neurotoxin 1-methyl-4-phenylpyridinium(MPP^(+))-induced cell models.Our results show that EGT alleviated MPTP-induced behavioral dysfunction in mice.Mechanistically,we innovatively revealed that EGT was a key regulator of DJ-1.EGT restored DA levels by activating the DJ-1-nuclear receptor-related factor 1(Nurr1)axis.Furthermore,it reduced reactive oxygen species(ROS)levels by regulating the DJ-1-nuclear factor erythroid 2-related factor 2(Nrf2)pathway,which inhibited oxidative stress-induced DAergic neuronal apoptosis.Combined treatment with DJ-1-si RNA transfection revealed that blocking DJ-1 reversed EGT upregulated Nurr1 and Nrf2 expression in the nucleus,which significantly decreased the benefits of EGT.Taken together,our study suggests that EGT can ameliorate PD and be considered as a strategy for PD treatment.
基金financially supported by National Natural Science Foundation of China(21773291,52303130,62205231,61904118,22002102)Natural Science Foundation of the Jiangsu Higher Education Institutions of China(19KJA210005)+1 种基金Postgraduate Research&Practice Innovation Program of Jiangsu Province(SJCX23_1710)Postgraduate Research&Practice Innovation Program of Suzhou University of Science and Technology(CLKYCX23_06)。
文摘Exploiting high-performance electrolyte holds the key for realization practical application of rechargeable magnesium batteries(RMBs).Herein,a new non-nucleophilic mononuclear electrolyte was developed and its electrochemical active species was identified as[Mg(DME)_(3)][GaCl_(4)]_(2) through single-crystal X-ray diffraction analysis.The as-synthesized Mg(GaCl_(4))_(2)-IL-DME electrolyte could achieve a high ionic conductivity(9.85 m S cm^(-1)),good anodic stability(2.9 V vs.Mg/Mg^(2+)),and highly reversible Mg plating/stripping.The remarkable electrochemical performance should be attributed to the in-situ formation of Mg^(2+)-conducting Ga_(5)Mg_(2)alloy layer at the Mg/electrolyte interface during electrochemical cycling,which not only efficiently protects the Mg anode from passivation,but also allows for rapid Mg-ion transport.Significantly,the Mg(GaCl_(4))_(2)-IL-DME electrolyte showed excellent compatibility with both conversion and intercalation cathodes.The Mg/S batteries with Mg(Ga Cl_(4))_(2)-IL-DME electrolyte and KB/S cathode showed a high specific capacity of 839 m Ah g^(-1)after 50 cycles at 0.1 C with the Coulombic efficiency of~100%.Moreover,the assembled Mg|Mo_6 S_8 batteries delivered a reversible discharge capacity of 85 m Ah g^(-1)after 120 cycles at 0.2 C.This work provides a universal electrolyte for the realization of high-performance and practical RMBs,especially Mg/S batteries.
文摘The industrial implementation of Solar-driven photocatalysis is hampered by inefficient charge separation,poor reusability and hard retrieval of powdery catalysts.To conquer these drawbacks,a self-floating S-scheme Bi_(4)O_(5)Br_(2)/P-doped C_(3)N_(4)/carbon fiber cloth(BB/PN/CC)composed of carbon fibers(CC)as the core and Bi_(4)O_(5)Br_(2)/P-doped C_(3)N_(4)(BB/PN)nanosheets as the shell was constructed as a competent,recyclable cloth-shaped photocatalyst for safe and efficient degradation of aquacultural antibiotics.The BB/PN/CC fabric achieves an exceptional tetracycline degradation rate constant of 0.0118 min‒1,surpassing CN/CC(0.0015 min^(‒1)),BB/CC(0.0066 min^(‒1))and PN/CC(0.0023 min^(‒1))by 6.9,0.8 and 4.1 folds,respectively.Beyond its catalytic prowess,the photocatalyst’s practical superiority is evident in its effortless recovery and environmental adaptability.The superior catalytic effectiveness stems from the S-scheme configuration,which retains the maximum redox capacities of the constituent BB and PN while enabling efficient spatial detachment of photo-carriers.X-ray photoelectron spectroscopy(XPS),in-situ XPS,and electron paramagnetic resonance analyses corroborate the S-scheme mechanism,revealing electron accumulation on PN and hole retention on BB under illumination.Density functional theory calculations further confirm S-scheme interfacial charge redistribution and internal electric field formation.This study advances the design of macroscopic S-scheme heterojunction photocatalysts for sustainable water purification.
