Solar-powered H_(2)O_(2)synthesis from water and oxygen presents a potential strategy in the industrial and environmental domains.However,insufficient light absorption,poor charge separation efficiency,and the same or...Solar-powered H_(2)O_(2)synthesis from water and oxygen presents a potential strategy in the industrial and environmental domains.However,insufficient light absorption,poor charge separation efficiency,and the same or nearby catalytic sites for the photocatalysts limit the activity of H_(2)O_(2)production.Herein,an ultraviolet-visible-near-infrared light responsive S-scheme heterojunction is created by growing ZnIn_(2)S_(4)(ZIS)subunits firmly on a core of resorcinol-formaldehyde(RF)sphere.The enhanced full-spectrum light response ZIS/RF core-shell structure is evidenced by UV/Vis-NIR diffuse reflectance spectra(DRS).In situ irradiation X-ray photoelectron spectroscopy(XPS)investigation confirms an S-scheme charge transfer mechanism between RF and ZIS.A directional interfacial electric field(IEF)drives the unique spatial separation feature of constructed heterojunction photoexcited carriers and redox centers through the S-scheme transfer pathway with H_(2)O_(2)production.Under solar light irradiation,the optimized ZIS/RF with core-shell structure shows a robust apparent quantum efficiency(AQY)up to 22.5%at 420 nm,1%at 720 nm,and 0.2%at 800 nm.With the key reaction intermediates determined by calculating the average number of transferred electrons and oxygen-reactive species,a possible full-spectrum-light-driven redox mechanism of H_(2)O_(2)synthesis is provided.展开更多
Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic a...Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic aromatic hydrocarbons(PAHs), which are priority pollutants in soils contaminated by oily sludge. The influence of different doses of oily sludge on the dissipation of PAHs was studied along with individual PAH profiles in soils after different periods of plant growth. Five soil samples were artificially contaminated with different percentages of oily sludge(0 %, 5 %, 10 %, 15 % and 20 %). Winter wheat grew in the oily sludge–amended soils for 265 days.PAH content in the soils was monitored over the course of the study. The rate of PAH dissipation is related to the properties of different PAHs, period of winter wheat growth, and oily sludge application dose. Analysis for treated soils indicates that the dissipation of PAHs increased significantly over the first 212 days, followed by minimal changes over the final 53 days of treatment. In contrast, PAH dissipation slowed with increasing oily sludge application. For each PAH, the experimental results showed a significant compound-dependent trend. Winter wheat in the present study significantly enhanced the dissipation of PAHs in oily sludge–contaminated soil.展开更多
Herbivore digestion in aquatic ecosystems is usually considered a method of nutrient repackaging rather than recycling,as recalcitrant and low-level nutrients are presumed for their egesta.We hypothesize that this opi...Herbivore digestion in aquatic ecosystems is usually considered a method of nutrient repackaging rather than recycling,as recalcitrant and low-level nutrients are presumed for their egesta.We hypothesize that this opinion holds only for nutrients recycled by excretion and egestion,not for those elements recycled overwhelmingly by fecal decomposition.In this study,we compared the dissolution of biogenic silica(BSi),phosphorus(P)and iron(Fe)between two food items and fecal pellets of two marine invertebrates fed on artificial seawaters free of bacteria.Relative to raw food materials,the mass proportion in fecal pellets of BSi increased,while that of P and Fe decreased.During the 21 days of incubation,the total dissolution rate of BSi was 13.9–36.0 times higher in fecal pellets than food items,followed by P(1.5–4.2 times)and Fe(1.1–2.4 times).While the dissolution of BSi and Fe occurred mostly in the first few days,P was mostly released in the last ten days.Regarding BSi dissolution,a higher rate was observed in oyster Crassostrea gigas than the Echiuran Urechis unicinctus,but no significant difference was found between fecal pellets in either species under naturally available diatom food(Phaeodactylum tricornutum)and introduced terrestrial food(rice husk powder),respectively.Our results show direct evidence of digestion-associated nutrients mobilization.BSi dissolution after animal digestion may be similarly efficient to that caused by bacteria colonization in natural seawater.展开更多
The increased contamination of potentially toxic element(PTE)has posed remarkable ecological risks to environment.Application of functionalized biochar for the remediation of PTE contaminated water and soils are of gr...The increased contamination of potentially toxic element(PTE)has posed remarkable ecological risks to environment.Application of functionalized biochar for the remediation of PTE contaminated water and soils are of great concern,and effective strategies are urgently needed to enhance the removal capacity of biochar for PTE.As a novel surface modification technology,the effect of layered double hydroxides(LDH)and sodium dodecyl sulfonate(SDS)on the remediation capacity of biochar for PTE polluted soils and water remains unclear.Sawdust biochar(SB)was coated with Mg and Fe to synthesize the Mg-Fe-LDH functionalized biochar(MFB);thereafter,the MFB was mixed with SDS solution to synthesize the organic-Mg-Fe-LDH biochar(MSB).The potential of SB,MFB,and MSB for remediation of Cd and Pb contaminated soil and water was evaluated in terms of adsorption capacity,immobilization efficiency,and stability.Loading of Mg-Fe-LDH into SB,along with SDS treatment created a regular micro-nano hierarchical structure and enhanced the surface roughness,aromaticity,and hydrophobicity of MSB as compared to SB.MSB exhibited a significantly higher maximum adsorption capacity(mg g^(−1))for water Pb(405.2)and Cd(673.0)than MFB(335.9 for Pb and 209.0 for Cd)and SB(178.2 for Pb and 186.1 for Cd).MSB altered the soluble fraction of Cd/Pb to the residual fraction and thus significantly decreased their mobilization in soil.The higher removal/immobilization efficiency of MSB could be attributed to its alkalinity,and the enhanced synergistic interactions including surface precipitation,ion exchange,complexation,and hydrogen bonding.The resistance to carbon loss by H_(2)O_(2),thermal recalcitrance index R_(50),and degree of graphitization in MSB were significantly improved compared to SB,indicating a more stable carbon fraction sequestered in MSB following aging in soil.These results indicate that MSB could be used for remediation of Cd and Pb contaminated soil and water.展开更多
基金supported by the General Research Fund(No.18300920)of Research Grants Council,Hong Kong,Dean’s Research Fund(Nos.04638 and C3688),FLASS,EdUHKMulti-disciplinary Research Capacity Building Scheme(No.04A29)EdUHK,Scientific Research Startup Foundation of Jiangsu Univer-sity(No.22JDG020).
文摘Solar-powered H_(2)O_(2)synthesis from water and oxygen presents a potential strategy in the industrial and environmental domains.However,insufficient light absorption,poor charge separation efficiency,and the same or nearby catalytic sites for the photocatalysts limit the activity of H_(2)O_(2)production.Herein,an ultraviolet-visible-near-infrared light responsive S-scheme heterojunction is created by growing ZnIn_(2)S_(4)(ZIS)subunits firmly on a core of resorcinol-formaldehyde(RF)sphere.The enhanced full-spectrum light response ZIS/RF core-shell structure is evidenced by UV/Vis-NIR diffuse reflectance spectra(DRS).In situ irradiation X-ray photoelectron spectroscopy(XPS)investigation confirms an S-scheme charge transfer mechanism between RF and ZIS.A directional interfacial electric field(IEF)drives the unique spatial separation feature of constructed heterojunction photoexcited carriers and redox centers through the S-scheme transfer pathway with H_(2)O_(2)production.Under solar light irradiation,the optimized ZIS/RF with core-shell structure shows a robust apparent quantum efficiency(AQY)up to 22.5%at 420 nm,1%at 720 nm,and 0.2%at 800 nm.With the key reaction intermediates determined by calculating the average number of transferred electrons and oxygen-reactive species,a possible full-spectrum-light-driven redox mechanism of H_(2)O_(2)synthesis is provided.
基金jointly supported by National Natural Science Foundation of China(41541025)Open Research Fund Program of Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University)(2015KFJJ01)
文摘Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic aromatic hydrocarbons(PAHs), which are priority pollutants in soils contaminated by oily sludge. The influence of different doses of oily sludge on the dissipation of PAHs was studied along with individual PAH profiles in soils after different periods of plant growth. Five soil samples were artificially contaminated with different percentages of oily sludge(0 %, 5 %, 10 %, 15 % and 20 %). Winter wheat grew in the oily sludge–amended soils for 265 days.PAH content in the soils was monitored over the course of the study. The rate of PAH dissipation is related to the properties of different PAHs, period of winter wheat growth, and oily sludge application dose. Analysis for treated soils indicates that the dissipation of PAHs increased significantly over the first 212 days, followed by minimal changes over the final 53 days of treatment. In contrast, PAH dissipation slowed with increasing oily sludge application. For each PAH, the experimental results showed a significant compound-dependent trend. Winter wheat in the present study significantly enhanced the dissipation of PAHs in oily sludge–contaminated soil.
基金Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23050401)。
文摘Herbivore digestion in aquatic ecosystems is usually considered a method of nutrient repackaging rather than recycling,as recalcitrant and low-level nutrients are presumed for their egesta.We hypothesize that this opinion holds only for nutrients recycled by excretion and egestion,not for those elements recycled overwhelmingly by fecal decomposition.In this study,we compared the dissolution of biogenic silica(BSi),phosphorus(P)and iron(Fe)between two food items and fecal pellets of two marine invertebrates fed on artificial seawaters free of bacteria.Relative to raw food materials,the mass proportion in fecal pellets of BSi increased,while that of P and Fe decreased.During the 21 days of incubation,the total dissolution rate of BSi was 13.9–36.0 times higher in fecal pellets than food items,followed by P(1.5–4.2 times)and Fe(1.1–2.4 times).While the dissolution of BSi and Fe occurred mostly in the first few days,P was mostly released in the last ten days.Regarding BSi dissolution,a higher rate was observed in oyster Crassostrea gigas than the Echiuran Urechis unicinctus,but no significant difference was found between fecal pellets in either species under naturally available diatom food(Phaeodactylum tricornutum)and introduced terrestrial food(rice husk powder),respectively.Our results show direct evidence of digestion-associated nutrients mobilization.BSi dissolution after animal digestion may be similarly efficient to that caused by bacteria colonization in natural seawater.
基金supported by the Major Scientific and Technological Innovation Project of Shandong Province(2021CXGC011206)Key Research and Development Program of Zhejiang Province,China(2024C03125)the author Esmat F.Ali extends his appreciation to Taif University,Saudi Arabia for supporting this work through project number(TU-DSPP-2024-27).
文摘The increased contamination of potentially toxic element(PTE)has posed remarkable ecological risks to environment.Application of functionalized biochar for the remediation of PTE contaminated water and soils are of great concern,and effective strategies are urgently needed to enhance the removal capacity of biochar for PTE.As a novel surface modification technology,the effect of layered double hydroxides(LDH)and sodium dodecyl sulfonate(SDS)on the remediation capacity of biochar for PTE polluted soils and water remains unclear.Sawdust biochar(SB)was coated with Mg and Fe to synthesize the Mg-Fe-LDH functionalized biochar(MFB);thereafter,the MFB was mixed with SDS solution to synthesize the organic-Mg-Fe-LDH biochar(MSB).The potential of SB,MFB,and MSB for remediation of Cd and Pb contaminated soil and water was evaluated in terms of adsorption capacity,immobilization efficiency,and stability.Loading of Mg-Fe-LDH into SB,along with SDS treatment created a regular micro-nano hierarchical structure and enhanced the surface roughness,aromaticity,and hydrophobicity of MSB as compared to SB.MSB exhibited a significantly higher maximum adsorption capacity(mg g^(−1))for water Pb(405.2)and Cd(673.0)than MFB(335.9 for Pb and 209.0 for Cd)and SB(178.2 for Pb and 186.1 for Cd).MSB altered the soluble fraction of Cd/Pb to the residual fraction and thus significantly decreased their mobilization in soil.The higher removal/immobilization efficiency of MSB could be attributed to its alkalinity,and the enhanced synergistic interactions including surface precipitation,ion exchange,complexation,and hydrogen bonding.The resistance to carbon loss by H_(2)O_(2),thermal recalcitrance index R_(50),and degree of graphitization in MSB were significantly improved compared to SB,indicating a more stable carbon fraction sequestered in MSB following aging in soil.These results indicate that MSB could be used for remediation of Cd and Pb contaminated soil and water.
