In this study, electrodeposition and thermal decomposition were alternatively used for the fabrication of a series of novel multilayer-structured SnO_2–Sb–Ce/Ti(SSCT) electrodes, and their physiochemical and electro...In this study, electrodeposition and thermal decomposition were alternatively used for the fabrication of a series of novel multilayer-structured SnO_2–Sb–Ce/Ti(SSCT) electrodes, and their physiochemical and electrochemical properties were investigated for electrochemical oxidation of tetracycline(TC) in aqueous medium.Experimentally, after the SnO_2–Sb–Ce(SSC) composite was electrodeposited for 120 s on the titanium substrate in aqueous solution, the outer thermal coatings composed of SSC were synthesized by a hydrothermal method.Both influences of electrodeposition time(T_(ed)) and thermal decomposition time(Ttd) were investigated to obtain the optimum preparation. It was found that when increasing T_(ed)to a certain extent a longer lifetime of electrode can be achieved, which was attributed to a more solid interlayer structure. A notable SSCTT_(ed),Ttdelectrode,i.e., SSCT3,10, which was prepared through three times of 120 s' electrodeposition(T_(ed)= 3) and ten times of thermal decomposition(Ttd= 10) obtained the highest oxygen evolution potential 3.141 V vs. SCE. In this selected electrode, when 10 mg·L^(-1) initial TC concentration was added to this wastewater, the highest color removal efficiency and mineralization rate of TC were 72.4% and 41.6%, respectively, with an applied electricity density of 20 m A·cm^(-2) and treatment time of 1 h. These results presented here demonstrate that the combined application of electrodeposition and thermal decomposition is effective in realization of enhanced electrocatalytic oxidation activity.展开更多
Ananas comosus var.bracteatus is an important ornamental plant because of its green/white chimeric leaves.The accumulation of anthocyanin makes the leaf turn to red especially in the marginal part.However,the red fade...Ananas comosus var.bracteatus is an important ornamental plant because of its green/white chimeric leaves.The accumulation of anthocyanin makes the leaf turn to red especially in the marginal part.However,the red fades away in summer and winter.Light intensity is one of the most important factors affecting leaf color along the seasons.In order to understand the effects of light intensity on the growth and coloration of the chimeric leaves,Ananas comosus var.bracteatus was grown under full sunlight,50%shade and 75%shade for 75 days to evaluate the concentration of pigments,the color parameters(values L^(*),a^(*),b^(*))and the morpho-anatomical variations of chimeric leaves.The results showed that a high irradiance was beneficial to keep the chimeric leaves red.However,prolonged exposure to high irradiance caused a damage,some of the leaves wrinkled and even burned.Shading instead decreased the concentration of anthocyanin and increased the concentration of chlorophyll,especially in the white marginal part of the leaves.Numerous chloroplasts were observed in the mesophyll cells of the white marginal part of the chimeric leaves under shading for 75 days.The increase in chlorophyll concentration resulted in a better growth of plants.In order to balance the growth and coloration of the leaves,approximately 50%shade is suggested to be the optimum light irradiance condition for Ananas comosus var.bracteatus in summer.展开更多
The advancement of bimetallic catalysts holds significant promise for the innovation of oxygen evolution reaction(OER)catalysts.Drawing from adsorbate evolution mechanism(AEM)and lattice oxygen oxidation mechanism(LOM...The advancement of bimetallic catalysts holds significant promise for the innovation of oxygen evolution reaction(OER)catalysts.Drawing from adsorbate evolution mechanism(AEM)and lattice oxygen oxidation mechanism(LOM),the incorporation of dual active sites has the potential to foster novel OER pathways,such as the coupled oxygen evolution mechanism(COM),which can surpass the limitations of OER and elevate catalytic performance.In this study,uniformly distributed Fe/Ni dual-site Fe-Ni_(2)P@C electrocatalysts are crafted by upcycling metals in electroplating sludge via an eco-friendly and sustainable microbial engineering technique.Our findings indicate that a substantial number of defects emerge at the Ni2P crystal during the OER process,laying the groundwork for lattice oxygen involvement.Moreover,the displacement of Ni/Fe in the crystal lattice intensifies the asymmetry of the electronic structure at the metal active sites,facilitating the deprotonation process.This research introduces an innovative paradigm for the synthesis of effective and robust transition metal-based OER catalysts,with implications for sustainable energy generation technologies.展开更多
Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water ...Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water molecules.In order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically investigated.The experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide ions.In addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic solvents.In order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid materials.The photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)luminescence.These experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.展开更多
Nucleotide second messengers are highly versatile signaling molecules that regulate a variety of key biological processes in bacteria.The best-studied examples are cyclic AMP(cAMP)and bis-(3'-5')-cyclic dimeri...Nucleotide second messengers are highly versatile signaling molecules that regulate a variety of key biological processes in bacteria.The best-studied examples are cyclic AMP(cAMP)and bis-(3'-5')-cyclic dimeric guanosine monophosphate(c-di-GMP),which both act as global regulators.Global regulatory frameworks of c-di-GMP and cAMP in bacteria show several parallels but also significant variances.In this review,we llustrate the global regulatory models of the two nucleotide second messengers,compare the different regulatory frameworks between c-di-GMP and cAMP,and discuss the mechanisms and physiological significance of cross-regulation between c-di-GMP and cAMP.c-di-GMP responds to numerous signals de-pendent on a great number of metabolic enzymes,and it regulates various signal transduction pathways through its huge number of effectors with varying activities.In contrast,due to the limited quantity,the cAMP metabolic enzymes and its major effector are regulated at different levels by diverse signals.cAMP performs its global regulatory function primarily by controlling the transcription of a large number of genes via cAMP receptor protein(CRP)in most bacteria.This review can help us understand how bacteria use the two typical nucleotide second messengers to effectively coordinate and integrate various physiological processes,providing theoretical guidelines for future research.展开更多
An extensive analysis of biexciton luminescence in high-quality,large perovskite CsPbBr_(3) nanocrystals shows how the biexciton Auger decay rate deviates from the"universal"volume scaling as the exciton con...An extensive analysis of biexciton luminescence in high-quality,large perovskite CsPbBr_(3) nanocrystals shows how the biexciton Auger decay rate deviates from the"universal"volume scaling as the exciton confinement becomes weaker.展开更多
In this paper,Nafion membrane was firstly modified by copper phthalocyanine tetrasulfonic acid tetrasodium salt(CuTSPc)to prepare the Nafion/CuTSPc-x composite membranes.FTIR,XRD and SEM results revealed the successfu...In this paper,Nafion membrane was firstly modified by copper phthalocyanine tetrasulfonic acid tetrasodium salt(CuTSPc)to prepare the Nafion/CuTSPc-x composite membranes.FTIR,XRD and SEM results revealed the successful incorporation of CuTSPc into Nafion and good compatibility between the two composites.The proton conductivities of the Nafion/CuTSPc-x composite membranes were evidently higher than pure cast Nafion membrane,and increased with CuTSPc contents.Among them,the Nafion/CuTSPc-6%membrane with the highest ion exchange capacity(1.14 mequivg^(-1))exhibited the highest proton conductivity of 0.084 S cm^(-1)at 30℃and 0.131 S cm^(-1)at 80C,respectively.When fabricated of a membrane electrode assembly(MEA),the Nafion/CuTSPc-4.5%membrane displayed an initial fuel cell performance with a power density of 43.3mWcm^(-2)at room temperature,close to that for pure cast Nafion membrane.Benefiting from the compact structure,high proton conductivity and outstanding stability,the Nafion/CuTSPc-x composite membranes show promising potentials for fuel cell applications.展开更多
Biochar is currently applied in many low-impact development measures,such as biofilters and filter strips.However,its application in permeable pavement is limited.Due to the wide range of raw material sources,biochar ...Biochar is currently applied in many low-impact development measures,such as biofilters and filter strips.However,its application in permeable pavement is limited.Due to the wide range of raw material sources,biochar may also contain nutrients and heavy metals.Whether its leachate will cause contamination during application remains unknown.Based on the static leachate contamination test,this study first evaluated the leachate contamination risks of three types of biochar and porous asphalt mixture(PA)with three biochar fillers.Through the pavement infiltration test,the purification performance of PA with biochar fillers and filter layers was further analysed.The results show that biochar contains nitrogen and phosphorus,and the leaching contamination of coconut shell is the most obvious;when the biochar is applied as a filler in PA,the leaching contamination decreases,while the pollutant purification performance is not obvious;when 3−5 mm rice straw biochar is used as a filter layer,the removal rate of total suspended solids can be 100%,but it is accompanied by more serious nitrogen and phosphorus leaching,and the greater the thickness,the more serious the degree of leaching.Deionized water cleaning can remove the phosphates contained in biochar,but have little effect on nitrogen.Therefore,before the application of biochar,cleaning measures should be taken to minimize its leaching contamination.展开更多
Because of abundant reserves and renewable and environmentally friendly properties,the utilization of woody biomass waste in road engineering can alleviate the shortage of fossil fuels and carbon emissions so as to mi...Because of abundant reserves and renewable and environmentally friendly properties,the utilization of woody biomass waste in road engineering can alleviate the shortage of fossil fuels and carbon emissions so as to mitigate global climate change and achieve sustainable development of road engineering.This paper synthesizes the state of the art about the strategies of applying five kinds of resources derived from waste woody biomass,including biochar,bio-oil,lignin,wood ash and nanocellulose to road construction.Based on the characteristics analysis of the five materials,it can be concluded that biochar can comprehensively improve the road performance of asphalt and its mixtures,and has the potential of runoff purification;bio-oil can soften asphalt and improve its lowtemperature performance,but has negative effects on high-temperature performance;lignin increases the asphalt ageing resistance and can be used as a regenerant,and will improve the overall performance of asphalt mixtures if combined with other modifiers;wood ash can increase subgrade bearing capacity and bring significant environmental benefits;nanocellulose improves the strength of cement mortar,but there is a lack of research on its effects on performance of pavement materials and the interaction mechanism;the lifecycle environmental and economic assessment of woody biomass-modified road materials is not comprehensive.Moreover,prospects were also summarized to show the opportunities for future study,such as the establishment of a database for biomass.This review provides useful insights for the utilization of woody biomass as road materials to achieve waste management and sustainable development.展开更多
基金Supported by the National Natural Science Foundation of China(U1510120)the International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee(14520721900)
文摘In this study, electrodeposition and thermal decomposition were alternatively used for the fabrication of a series of novel multilayer-structured SnO_2–Sb–Ce/Ti(SSCT) electrodes, and their physiochemical and electrochemical properties were investigated for electrochemical oxidation of tetracycline(TC) in aqueous medium.Experimentally, after the SnO_2–Sb–Ce(SSC) composite was electrodeposited for 120 s on the titanium substrate in aqueous solution, the outer thermal coatings composed of SSC were synthesized by a hydrothermal method.Both influences of electrodeposition time(T_(ed)) and thermal decomposition time(Ttd) were investigated to obtain the optimum preparation. It was found that when increasing T_(ed)to a certain extent a longer lifetime of electrode can be achieved, which was attributed to a more solid interlayer structure. A notable SSCTT_(ed),Ttdelectrode,i.e., SSCT3,10, which was prepared through three times of 120 s' electrodeposition(T_(ed)= 3) and ten times of thermal decomposition(Ttd= 10) obtained the highest oxygen evolution potential 3.141 V vs. SCE. In this selected electrode, when 10 mg·L^(-1) initial TC concentration was added to this wastewater, the highest color removal efficiency and mineralization rate of TC were 72.4% and 41.6%, respectively, with an applied electricity density of 20 m A·cm^(-2) and treatment time of 1 h. These results presented here demonstrate that the combined application of electrodeposition and thermal decomposition is effective in realization of enhanced electrocatalytic oxidation activity.
基金This work was funded by the National Natural Science Foundation of China(Grant Nos.31971704,31770743).
文摘Ananas comosus var.bracteatus is an important ornamental plant because of its green/white chimeric leaves.The accumulation of anthocyanin makes the leaf turn to red especially in the marginal part.However,the red fades away in summer and winter.Light intensity is one of the most important factors affecting leaf color along the seasons.In order to understand the effects of light intensity on the growth and coloration of the chimeric leaves,Ananas comosus var.bracteatus was grown under full sunlight,50%shade and 75%shade for 75 days to evaluate the concentration of pigments,the color parameters(values L^(*),a^(*),b^(*))and the morpho-anatomical variations of chimeric leaves.The results showed that a high irradiance was beneficial to keep the chimeric leaves red.However,prolonged exposure to high irradiance caused a damage,some of the leaves wrinkled and even burned.Shading instead decreased the concentration of anthocyanin and increased the concentration of chlorophyll,especially in the white marginal part of the leaves.Numerous chloroplasts were observed in the mesophyll cells of the white marginal part of the chimeric leaves under shading for 75 days.The increase in chlorophyll concentration resulted in a better growth of plants.In order to balance the growth and coloration of the leaves,approximately 50%shade is suggested to be the optimum light irradiance condition for Ananas comosus var.bracteatus in summer.
基金supported by the National Natural Science Foundation of China(Nos.21905317 and U23B20166)the Young Elite Scientists Sponsorship Program by CAST(No.2019QNRC001)the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(No.76180-31620007).
文摘The advancement of bimetallic catalysts holds significant promise for the innovation of oxygen evolution reaction(OER)catalysts.Drawing from adsorbate evolution mechanism(AEM)and lattice oxygen oxidation mechanism(LOM),the incorporation of dual active sites has the potential to foster novel OER pathways,such as the coupled oxygen evolution mechanism(COM),which can surpass the limitations of OER and elevate catalytic performance.In this study,uniformly distributed Fe/Ni dual-site Fe-Ni_(2)P@C electrocatalysts are crafted by upcycling metals in electroplating sludge via an eco-friendly and sustainable microbial engineering technique.Our findings indicate that a substantial number of defects emerge at the Ni2P crystal during the OER process,laying the groundwork for lattice oxygen involvement.Moreover,the displacement of Ni/Fe in the crystal lattice intensifies the asymmetry of the electronic structure at the metal active sites,facilitating the deprotonation process.This research introduces an innovative paradigm for the synthesis of effective and robust transition metal-based OER catalysts,with implications for sustainable energy generation technologies.
基金Project supported by the Natural Science Foundation of Shaanxi Province(2021JQ-799)Key Scientific Research Plan of Shaanxi Provincial Department of Education(22JC001)。
文摘Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water molecules.In order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically investigated.The experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide ions.In addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic solvents.In order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid materials.The photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)luminescence.These experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.
基金funded by the National Natural Science Foundation of China(Nos.32370023,32370583,31970036,and 31900401)Natural Science Foundation of the Jiangsu Higher Education Institutions of China(20KJB180001 and 20KJA180007)+2 种基金Natural Science Foundation of Jiangsu Province(BK20210920 and BK20231350)Jiangsu Agricultural Science and Technology Innovation Fund(Cx223125)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘Nucleotide second messengers are highly versatile signaling molecules that regulate a variety of key biological processes in bacteria.The best-studied examples are cyclic AMP(cAMP)and bis-(3'-5')-cyclic dimeric guanosine monophosphate(c-di-GMP),which both act as global regulators.Global regulatory frameworks of c-di-GMP and cAMP in bacteria show several parallels but also significant variances.In this review,we llustrate the global regulatory models of the two nucleotide second messengers,compare the different regulatory frameworks between c-di-GMP and cAMP,and discuss the mechanisms and physiological significance of cross-regulation between c-di-GMP and cAMP.c-di-GMP responds to numerous signals de-pendent on a great number of metabolic enzymes,and it regulates various signal transduction pathways through its huge number of effectors with varying activities.In contrast,due to the limited quantity,the cAMP metabolic enzymes and its major effector are regulated at different levels by diverse signals.cAMP performs its global regulatory function primarily by controlling the transcription of a large number of genes via cAMP receptor protein(CRP)in most bacteria.This review can help us understand how bacteria use the two typical nucleotide second messengers to effectively coordinate and integrate various physiological processes,providing theoretical guidelines for future research.
基金financially supported by the Science and Technology Commission of Shanghai Municipality(20501130200)the National Natural Science Foundation of China(51402342 and 61775201)the National Defense Technology Innovation Special Zone Project.
文摘An extensive analysis of biexciton luminescence in high-quality,large perovskite CsPbBr_(3) nanocrystals shows how the biexciton Auger decay rate deviates from the"universal"volume scaling as the exciton confinement becomes weaker.
基金This work is financially supported by the National Key R&D Program of China(2017YFB0102900)National Natural Science Foundation of China(U1510120).
文摘In this paper,Nafion membrane was firstly modified by copper phthalocyanine tetrasulfonic acid tetrasodium salt(CuTSPc)to prepare the Nafion/CuTSPc-x composite membranes.FTIR,XRD and SEM results revealed the successful incorporation of CuTSPc into Nafion and good compatibility between the two composites.The proton conductivities of the Nafion/CuTSPc-x composite membranes were evidently higher than pure cast Nafion membrane,and increased with CuTSPc contents.Among them,the Nafion/CuTSPc-6%membrane with the highest ion exchange capacity(1.14 mequivg^(-1))exhibited the highest proton conductivity of 0.084 S cm^(-1)at 30℃and 0.131 S cm^(-1)at 80C,respectively.When fabricated of a membrane electrode assembly(MEA),the Nafion/CuTSPc-4.5%membrane displayed an initial fuel cell performance with a power density of 43.3mWcm^(-2)at room temperature,close to that for pure cast Nafion membrane.Benefiting from the compact structure,high proton conductivity and outstanding stability,the Nafion/CuTSPc-x composite membranes show promising potentials for fuel cell applications.
基金supported by a grant from the Fundamen-tal Research Funds for the Central Universities of China (Grant No.22120210027).
文摘Biochar is currently applied in many low-impact development measures,such as biofilters and filter strips.However,its application in permeable pavement is limited.Due to the wide range of raw material sources,biochar may also contain nutrients and heavy metals.Whether its leachate will cause contamination during application remains unknown.Based on the static leachate contamination test,this study first evaluated the leachate contamination risks of three types of biochar and porous asphalt mixture(PA)with three biochar fillers.Through the pavement infiltration test,the purification performance of PA with biochar fillers and filter layers was further analysed.The results show that biochar contains nitrogen and phosphorus,and the leaching contamination of coconut shell is the most obvious;when the biochar is applied as a filler in PA,the leaching contamination decreases,while the pollutant purification performance is not obvious;when 3−5 mm rice straw biochar is used as a filter layer,the removal rate of total suspended solids can be 100%,but it is accompanied by more serious nitrogen and phosphorus leaching,and the greater the thickness,the more serious the degree of leaching.Deionized water cleaning can remove the phosphates contained in biochar,but have little effect on nitrogen.Therefore,before the application of biochar,cleaning measures should be taken to minimize its leaching contamination.
基金supported by the National Key Research and Development Program of China (No.2018YFB1600100)the Fundamental Research Funds for the Central Universities (No.22120210027).
文摘Because of abundant reserves and renewable and environmentally friendly properties,the utilization of woody biomass waste in road engineering can alleviate the shortage of fossil fuels and carbon emissions so as to mitigate global climate change and achieve sustainable development of road engineering.This paper synthesizes the state of the art about the strategies of applying five kinds of resources derived from waste woody biomass,including biochar,bio-oil,lignin,wood ash and nanocellulose to road construction.Based on the characteristics analysis of the five materials,it can be concluded that biochar can comprehensively improve the road performance of asphalt and its mixtures,and has the potential of runoff purification;bio-oil can soften asphalt and improve its lowtemperature performance,but has negative effects on high-temperature performance;lignin increases the asphalt ageing resistance and can be used as a regenerant,and will improve the overall performance of asphalt mixtures if combined with other modifiers;wood ash can increase subgrade bearing capacity and bring significant environmental benefits;nanocellulose improves the strength of cement mortar,but there is a lack of research on its effects on performance of pavement materials and the interaction mechanism;the lifecycle environmental and economic assessment of woody biomass-modified road materials is not comprehensive.Moreover,prospects were also summarized to show the opportunities for future study,such as the establishment of a database for biomass.This review provides useful insights for the utilization of woody biomass as road materials to achieve waste management and sustainable development.
