Simultaneously adjusting the surface,crystallographic and electronic structures of nanomaterials provide a new avenue for rational design of advanced photocatalyst yet it is challenging.In this work,a surface and stru...Simultaneously adjusting the surface,crystallographic and electronic structures of nanomaterials provide a new avenue for rational design of advanced photocatalyst yet it is challenging.In this work,a surface and structural engineering strategy is developed to simultaneously realize the 2D amorphous structure and oxygen(O)-doping in graphitic carbon nitride(g–C_(3)N_(4))via the assistance of supercritical carbon dioxide(SCCO_(2)).The 2D O-doped amorphous g-C_(3)N_(4)nanosheets display greatly enhanced photocatalytic CO_(2)reduction and methylene blue degradation performances.The synthesis method as well as the mechanism of the enhanced photocatalytic activity was investigated,wherein the introduction of 2D amorphous structure and O dopant in the g-C_(3)N_(4)contributes to the increased surface area,abundant active sites,wider visible-light absorption range and efficient charge separation property,and thus the outstanding photocatalytic activities can be obtained.Its photocatalytic CH_(4)evolution rate and MB degradation rete are 5.1 and 7.0 times enhancement over bulk crystalline g-C_(3)N_(4),respectively.This work presents a great promising way for designing and developing advanced photocatalysts.展开更多
Propofol,a common intravenous anesthetic used in clinical,has been shown to regulate cells proliferation,inflammation,angiogenesis and metastasis as well as exerting anti-cancer effect in several different types of ca...Propofol,a common intravenous anesthetic used in clinical,has been shown to regulate cells proliferation,inflammation,angiogenesis and metastasis as well as exerting anti-cancer effect in several different types of cancer.However,the functions and mechanisms of propofol in lactate secretion and invasion of cancer cells remain unknown.The primary aim of this study was to investigate the role of propofol in cells migration and invasion of colon cancer(CRC).Scratches assay,Transwell assay were used to detect colon cells migration and invasion.Realtime Quantitative Polymerase Chain Reaction(RT-qPCR),Western blotting were utilized to detect the expression of related molecules.Dual-luciferase assay was performed to identify transcriptional activity of target genes,RNA pulldown assay was used to confirm the interactions of RNAs.Results indicated that propofol inhibited cell migration and invasion through suppressing lactic acid production in CRC.Moreover,propofol reduced lactic acid production by down-regulating the expression of hypoxia inducible factor-1α(HIF-1α)and monocarboxylate transporter 4(MCT4).In addition,propofol inhibited the expression of HIF-1αand cells migration/invasion via suppressing the interaction of HOX transcript antisense RNA(HOTAIR)with miR-93.The present study indicated that propofol inhibited colon cancer cell migration and invasion by reducing lactic acid production and the expression of HIF-1αand MCT4 via HOTAIR/miR-93 axis.These data may provide potential metabolic targets for CRC treatment.展开更多
Fluorescent-patterned materials are widely used in information storage and encryp-tion.However,preparing a patternedfluorescent display on a matrix currently requires a time-consuming(hours or even days)and complex mul...Fluorescent-patterned materials are widely used in information storage and encryp-tion.However,preparing a patternedfluorescent display on a matrix currently requires a time-consuming(hours or even days)and complex multi-step process.Herein,a rapid and mild technique developed for the in-situ controllable synthe-sis offluorescent nitrogen-doped carbon dots(NCDs)on eco-friendly transparent woodfilms(TEMPO-oxidized carboxyl woodfilm[TOWF])within a few min-utes was developed.A wood skeleton was employed as the carbon precursor for NCD synthesis as well as the matrix for the uniform and controlled distribution of NCDs.Moreover,the in-situ synthesis mechanism for preparing NCDs in TOWF was proposed.The resultingfluorescent woodfilms have excellent tensile strength(310.0015.57 MPa),high transmittance(76.2%),high haze(95.0%),UV-blocking±properties in the full ultraviolet(UV)range,andfluorescent performance that can be modified by changing the heating parameters.Fluorescent patterning was sim-ply achieved by regulating the in-situ NCD synthesis regions,and thefluorescent patterns were formed within 10 s.Thesefluorescent-patterned woodfilms can effec-tively store and encrypt information,and they can interact with external information through a transparent matrix.This work provides a green and efficient strategy for fabricatingfluorescent information storage and encryption materials.展开更多
In order to improve the mechanical properties and toughness of phenolic foams,a reinforcement method using two kinds of bamboo fibers was optimized with respect to the fiber contents.The compressive and flexural prope...In order to improve the mechanical properties and toughness of phenolic foams,a reinforcement method using two kinds of bamboo fibers was optimized with respect to the fiber contents.The compressive and flexural properties,thermal stability,friability and morphology of the phenolic foam composites were studied.The mechanical properties of the pristine foam and composites were evaluated by measuring the compressive strength.The results showed that the greatest mechanical properties were achieved by incorporating 2.5wt%of the reinforcement,and the compressive and flexural strengths of the two composites increased by 26.21%and 24.35%,respectively,compared with that of the pristine foam.The results of thermogravimetric testing demonstrated that the addition of bamboo fiber imparted better thermal stability to the phenolic foam,which was mainly attributed to the higher initial thermal decomposition temperature of the bamboo fiber.However,the influences of both reinforcements on the thermal stability of the material were negligible.The incorporation of bamboo fiber decreased the friability of the phenolic foam.Furthermore,the reduction in friability of the foam composites with longer lengths were higher than that in foams with shorter bamboo fibers.Moreover,the morphology and cell sizes of the fiber-reinforced phenolic foams were analyzed by scanning electron microscopy,the results indicated strong bonding between the fibers and phenolic matrix,and the incorporation of the bamboo fibers into the foam resulted in increased cell size of the material.Finally,the thermal conductivity and flame resistance of the phenolic foams reinforced by the bamboo fibers were also measured.展开更多
Apilot scale test of advanced treatment of ethene wastewater by ozonization was carried out for industrial water reuse.Effects of different operating conditions on COD degradation,such as wastewater flow rate,ozonized...Apilot scale test of advanced treatment of ethene wastewater by ozonization was carried out for industrial water reuse.Effects of different operating conditions on COD degradation,such as wastewater flow rate,ozonized gas flow rate,operating voltage of ozonizer and two ozone generation means,using pure oxygen or air,was investigated.The results show that the increase of ozonizer operating voltage,the decrease of wastewater flow rate and the suitable ozonized gas flowrate improve the removal ofCOD inwastewater and thatozone generatedrespectively fromair and pure oxygen can effectively remove COD of ethene wastewater to meet the industrial water reuse criterion.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21773216,51173170,21703207)the financial support from the Innovation Talents Award of Henan Province(114200510019)+1 种基金Science and Technology Program from Henan province(152102410010)the China Postdoctoral Science Foundation(No.2018T110738)。
文摘Simultaneously adjusting the surface,crystallographic and electronic structures of nanomaterials provide a new avenue for rational design of advanced photocatalyst yet it is challenging.In this work,a surface and structural engineering strategy is developed to simultaneously realize the 2D amorphous structure and oxygen(O)-doping in graphitic carbon nitride(g–C_(3)N_(4))via the assistance of supercritical carbon dioxide(SCCO_(2)).The 2D O-doped amorphous g-C_(3)N_(4)nanosheets display greatly enhanced photocatalytic CO_(2)reduction and methylene blue degradation performances.The synthesis method as well as the mechanism of the enhanced photocatalytic activity was investigated,wherein the introduction of 2D amorphous structure and O dopant in the g-C_(3)N_(4)contributes to the increased surface area,abundant active sites,wider visible-light absorption range and efficient charge separation property,and thus the outstanding photocatalytic activities can be obtained.Its photocatalytic CH_(4)evolution rate and MB degradation rete are 5.1 and 7.0 times enhancement over bulk crystalline g-C_(3)N_(4),respectively.This work presents a great promising way for designing and developing advanced photocatalysts.
基金the National Natural Science Foundation of China(81772761,81672540).
文摘Propofol,a common intravenous anesthetic used in clinical,has been shown to regulate cells proliferation,inflammation,angiogenesis and metastasis as well as exerting anti-cancer effect in several different types of cancer.However,the functions and mechanisms of propofol in lactate secretion and invasion of cancer cells remain unknown.The primary aim of this study was to investigate the role of propofol in cells migration and invasion of colon cancer(CRC).Scratches assay,Transwell assay were used to detect colon cells migration and invasion.Realtime Quantitative Polymerase Chain Reaction(RT-qPCR),Western blotting were utilized to detect the expression of related molecules.Dual-luciferase assay was performed to identify transcriptional activity of target genes,RNA pulldown assay was used to confirm the interactions of RNAs.Results indicated that propofol inhibited cell migration and invasion through suppressing lactic acid production in CRC.Moreover,propofol reduced lactic acid production by down-regulating the expression of hypoxia inducible factor-1α(HIF-1α)and monocarboxylate transporter 4(MCT4).In addition,propofol inhibited the expression of HIF-1αand cells migration/invasion via suppressing the interaction of HOX transcript antisense RNA(HOTAIR)with miR-93.The present study indicated that propofol inhibited colon cancer cell migration and invasion by reducing lactic acid production and the expression of HIF-1αand MCT4 via HOTAIR/miR-93 axis.These data may provide potential metabolic targets for CRC treatment.
文摘Fluorescent-patterned materials are widely used in information storage and encryp-tion.However,preparing a patternedfluorescent display on a matrix currently requires a time-consuming(hours or even days)and complex multi-step process.Herein,a rapid and mild technique developed for the in-situ controllable synthe-sis offluorescent nitrogen-doped carbon dots(NCDs)on eco-friendly transparent woodfilms(TEMPO-oxidized carboxyl woodfilm[TOWF])within a few min-utes was developed.A wood skeleton was employed as the carbon precursor for NCD synthesis as well as the matrix for the uniform and controlled distribution of NCDs.Moreover,the in-situ synthesis mechanism for preparing NCDs in TOWF was proposed.The resultingfluorescent woodfilms have excellent tensile strength(310.0015.57 MPa),high transmittance(76.2%),high haze(95.0%),UV-blocking±properties in the full ultraviolet(UV)range,andfluorescent performance that can be modified by changing the heating parameters.Fluorescent patterning was sim-ply achieved by regulating the in-situ NCD synthesis regions,and thefluorescent patterns were formed within 10 s.Thesefluorescent-patterned woodfilms can effec-tively store and encrypt information,and they can interact with external information through a transparent matrix.This work provides a green and efficient strategy for fabricatingfluorescent information storage and encryption materials.
基金the National Key Point Research and Invention Program of the Thirteenth(No.2017YFD0600802)for financial support.
文摘In order to improve the mechanical properties and toughness of phenolic foams,a reinforcement method using two kinds of bamboo fibers was optimized with respect to the fiber contents.The compressive and flexural properties,thermal stability,friability and morphology of the phenolic foam composites were studied.The mechanical properties of the pristine foam and composites were evaluated by measuring the compressive strength.The results showed that the greatest mechanical properties were achieved by incorporating 2.5wt%of the reinforcement,and the compressive and flexural strengths of the two composites increased by 26.21%and 24.35%,respectively,compared with that of the pristine foam.The results of thermogravimetric testing demonstrated that the addition of bamboo fiber imparted better thermal stability to the phenolic foam,which was mainly attributed to the higher initial thermal decomposition temperature of the bamboo fiber.However,the influences of both reinforcements on the thermal stability of the material were negligible.The incorporation of bamboo fiber decreased the friability of the phenolic foam.Furthermore,the reduction in friability of the foam composites with longer lengths were higher than that in foams with shorter bamboo fibers.Moreover,the morphology and cell sizes of the fiber-reinforced phenolic foams were analyzed by scanning electron microscopy,the results indicated strong bonding between the fibers and phenolic matrix,and the incorporation of the bamboo fibers into the foam resulted in increased cell size of the material.Finally,the thermal conductivity and flame resistance of the phenolic foams reinforced by the bamboo fibers were also measured.
基金the Guangdong Province Scientific Plan Project(No.2005A40201002).
文摘Apilot scale test of advanced treatment of ethene wastewater by ozonization was carried out for industrial water reuse.Effects of different operating conditions on COD degradation,such as wastewater flow rate,ozonized gas flow rate,operating voltage of ozonizer and two ozone generation means,using pure oxygen or air,was investigated.The results show that the increase of ozonizer operating voltage,the decrease of wastewater flow rate and the suitable ozonized gas flowrate improve the removal ofCOD inwastewater and thatozone generatedrespectively fromair and pure oxygen can effectively remove COD of ethene wastewater to meet the industrial water reuse criterion.
