A series of MoS_(2)-modified CuO(CuO/MoS_(2))heterostructures were successfully fabricated.The photodegradation properties of organic dyes were explored in detail under visible light.The photocatalytic results demonst...A series of MoS_(2)-modified CuO(CuO/MoS_(2))heterostructures were successfully fabricated.The photodegradation properties of organic dyes were explored in detail under visible light.The photocatalytic results demonstrate that the CuO/MoS_(2)-3 heterostructure delivers superior degradation rates towards methyl violet dye(MV)and rhodamine B(RhB),reaching 99.8%and 95.3%within 30 min,respectively.The decent photodegradation activity is due to improved visible light adsorption and faster transfer of electron-hole pairs.The radical trapping experiments show that superoxide radicals(O_(2)^(-))and holes(h+)are the main active species in the removal of MV.Furthermore,the CuO/MoS_(2)-3 composite possesses the prominent stability and recyclability.This work offers a highly sustainable technique for designing a high-efficiency photocatalyst to remove environmental pollutants.展开更多
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has spread worldwide and threatened human’s health.With the passing of time,the epidemiology of coronavirus disease 2019 evolves and the know...The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has spread worldwide and threatened human’s health.With the passing of time,the epidemiology of coronavirus disease 2019 evolves and the knowledge of SARS-CoV-2 infection accumulates.To further improve the scientific and standardized diagnosis and treatment of maternal SARS-CoV-2 infection in China,the Chinese Society of Perinatal Medicine of Chinese Medical Association commissioned leading experts to develop the Recommendations for the Diagnosis and Treatment of Maternal SARS-CoV-2 Infection under the guidance of the Maternal and Child Health Department of the National Health Commission.This recommendations includes the epidemiology,diagnosis,management,maternal care,medication treatment,care of birth and newborns,and psychological support associated with maternal SARS-CoV-2 infection.It is hoped that the recommendations will effectively help the clinical management of maternal SARS-CoV-2 infection.展开更多
The absorption spectra of chromophoric dissolved organic matter(CDOM),along with general physical,chemical and biological variables,were determined in the Bohai Bay,China,in the springs of 2011 and 2012. The absorptio...The absorption spectra of chromophoric dissolved organic matter(CDOM),along with general physical,chemical and biological variables,were determined in the Bohai Bay,China,in the springs of 2011 and 2012. The absorption coefficient of CDOM at 350 nm(a350) in surface water ranged from 1.00 to 1.83 m-1(mean: 1.35 m-1) in May 2011 and from 0.78 to 1.92 m-1(mean:1.19 m-1) in April 2012. Little surface-bottom difference was observed due to strong vertical mixing. The a350 was weakly anti-correlated to salinity but positively correlated to chlorophyll a(Chl-a) concentration. A shoulder over 260–290 nm,suggestive of biogenic molecules,superimposed the overall pattern of exponentially decreasing CDOM absorption with wavelength. The wavelength distribution of the absorption spectral slope manifested a pronounced peak at ca. 300 nm characteristic of algal-derived CDOM. All a250/a365 ratios exceeded 6,corresponding to CDOM molecular weights(Mw) of less than 1 kDa. Spectroscopically,CDOM in the Bohai Bay differed substantively from that in the Haihe River,the bay's dominant source of land runoff; photobleaching of the riverine CDOM enlarged the difference.Results point to marine biological production being the principal source of CDOM in the Bohai Bay during the sampling seasons. Relatively low runoff,fast dilution,and selective photodegradation are postulated to be among the overarching elements responsible for the lack of terrigenous CDOM signature in the bay water.展开更多
Tin dioxide is important gas sensor material and has wide applications in the detection of toxic gases and volatile organic compounds.Here,we synthesized a 3D laminated structural CuO/SnO2 material possessing p-n hete...Tin dioxide is important gas sensor material and has wide applications in the detection of toxic gases and volatile organic compounds.Here,we synthesized a 3D laminated structural CuO/SnO2 material possessing p-n heterostructures.The morphology and structure were characterized by XRD,SEM,TEM and XPS techniques and the sensing properties were investigated for the detection of triethylamine(TEA).The results indicate that 3D laminated CuO/SnO2 material,assembled by lamellae consisting of ordered nanoparticles,exhibit an enhanced sensing performance compared with SnO2,and notably,CuO/SnO2 with size less than 1μm has obvious high selectivity in the detection of 100 ppm TEA.Particularly,it has a high response and stability to 1 and 5 ppm TEA(S is 8 and 33),and that is higher than SnO2 material,suggesting 3D laminated CuO/SnO2 is an effective ca ndidate material served as sensor platform to detect low-concentration amines.展开更多
Organic amines are important solvent and raw material in laboratory and industry,as well as releasing from cigarette smoke.It is significant to detect low-concentration amines for environment and public health.Here we...Organic amines are important solvent and raw material in laboratory and industry,as well as releasing from cigarette smoke.It is significant to detect low-concentration amines for environment and public health.Here we reported that as-synthesized zinc oxide is an effective electrode material of electrochemical sensor for the detection of amines.The characterization results reveal that the ZnO morphologies experienced a change from hexagonal bowl-like microparticles,cones,prisms to nanoparticles by adjusting the reaction time,temperature,solvents and additives.Interestingly,ZnO material possessing hexagonal shapes and different sizes exhibits distinct electrochemical response in various amines solution,suggesting that there is a better dependent relationship between different morphological ZnO and amines detection.Particularly,regular hexagonal ZnO nanotablets exhibit a detectable electrochemical response and selectivity to ammonia,implying it can be serve as electrode material for highly effective detection of organic amines.展开更多
基金the National Natural Science Foundation of China(51572185)Natural Science Foundation of Shanxi Province(202203021211158 and 20210302123173)the Key Research and Developmen program of Shanxi Province(International Cooperation,201903D421079)for the financial support.
文摘A series of MoS_(2)-modified CuO(CuO/MoS_(2))heterostructures were successfully fabricated.The photodegradation properties of organic dyes were explored in detail under visible light.The photocatalytic results demonstrate that the CuO/MoS_(2)-3 heterostructure delivers superior degradation rates towards methyl violet dye(MV)and rhodamine B(RhB),reaching 99.8%and 95.3%within 30 min,respectively.The decent photodegradation activity is due to improved visible light adsorption and faster transfer of electron-hole pairs.The radical trapping experiments show that superoxide radicals(O_(2)^(-))and holes(h+)are the main active species in the removal of MV.Furthermore,the CuO/MoS_(2)-3 composite possesses the prominent stability and recyclability.This work offers a highly sustainable technique for designing a high-efficiency photocatalyst to remove environmental pollutants.
文摘The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has spread worldwide and threatened human’s health.With the passing of time,the epidemiology of coronavirus disease 2019 evolves and the knowledge of SARS-CoV-2 infection accumulates.To further improve the scientific and standardized diagnosis and treatment of maternal SARS-CoV-2 infection in China,the Chinese Society of Perinatal Medicine of Chinese Medical Association commissioned leading experts to develop the Recommendations for the Diagnosis and Treatment of Maternal SARS-CoV-2 Infection under the guidance of the Maternal and Child Health Department of the National Health Commission.This recommendations includes the epidemiology,diagnosis,management,maternal care,medication treatment,care of birth and newborns,and psychological support associated with maternal SARS-CoV-2 infection.It is hoped that the recommendations will effectively help the clinical management of maternal SARS-CoV-2 infection.
基金supported by the Ministry of Science and Technology of China (Nos.2013CB956601,2010BAC68B04)the National Natural Science Foundation of China (No.41376081)
文摘The absorption spectra of chromophoric dissolved organic matter(CDOM),along with general physical,chemical and biological variables,were determined in the Bohai Bay,China,in the springs of 2011 and 2012. The absorption coefficient of CDOM at 350 nm(a350) in surface water ranged from 1.00 to 1.83 m-1(mean: 1.35 m-1) in May 2011 and from 0.78 to 1.92 m-1(mean:1.19 m-1) in April 2012. Little surface-bottom difference was observed due to strong vertical mixing. The a350 was weakly anti-correlated to salinity but positively correlated to chlorophyll a(Chl-a) concentration. A shoulder over 260–290 nm,suggestive of biogenic molecules,superimposed the overall pattern of exponentially decreasing CDOM absorption with wavelength. The wavelength distribution of the absorption spectral slope manifested a pronounced peak at ca. 300 nm characteristic of algal-derived CDOM. All a250/a365 ratios exceeded 6,corresponding to CDOM molecular weights(Mw) of less than 1 kDa. Spectroscopically,CDOM in the Bohai Bay differed substantively from that in the Haihe River,the bay's dominant source of land runoff; photobleaching of the riverine CDOM enlarged the difference.Results point to marine biological production being the principal source of CDOM in the Bohai Bay during the sampling seasons. Relatively low runoff,fast dilution,and selective photodegradation are postulated to be among the overarching elements responsible for the lack of terrigenous CDOM signature in the bay water.
基金National Natural Science Foundation of China(No.51572185)Natural Science Foundation of Shanxi Province(No.2014011016-4)+4 种基金Key R&D program of Shanxi Province(International Cooperation,No.201903D421079)for the financial supportsupported by Shanxi Province Technology Foundation for Selected Overseas Chinese ScholarResearch Project Supported by Shanxi Scholarship Council of ChinaCollege Student Innovation Program of Shanxi(Nos.2017550,2018081)National College Student Innovation and Entrepreneurship Training Program(No.201910112002)。
文摘Tin dioxide is important gas sensor material and has wide applications in the detection of toxic gases and volatile organic compounds.Here,we synthesized a 3D laminated structural CuO/SnO2 material possessing p-n heterostructures.The morphology and structure were characterized by XRD,SEM,TEM and XPS techniques and the sensing properties were investigated for the detection of triethylamine(TEA).The results indicate that 3D laminated CuO/SnO2 material,assembled by lamellae consisting of ordered nanoparticles,exhibit an enhanced sensing performance compared with SnO2,and notably,CuO/SnO2 with size less than 1μm has obvious high selectivity in the detection of 100 ppm TEA.Particularly,it has a high response and stability to 1 and 5 ppm TEA(S is 8 and 33),and that is higher than SnO2 material,suggesting 3D laminated CuO/SnO2 is an effective ca ndidate material served as sensor platform to detect low-concentration amines.
基金National Natural Science Foundation of China (No.51572185)Natural Science Foundation of Shanxi Province (No.2014011016-4)+4 种基金Key R&D program of Shanxi Province (International Cooperation,No.201903D421079) for the financial supportsupported by Shanxi Province Technology Foundation for Selected Overseas Chinese ScholarResearch Project Supported by Shanxi Scholarship Council of ChinaCollege Student Innovation Program of Shanxi (Nos.2017550,2018081)National College Student Innovation and Entrepreneurship Training Program (No.201910112002)。
文摘Organic amines are important solvent and raw material in laboratory and industry,as well as releasing from cigarette smoke.It is significant to detect low-concentration amines for environment and public health.Here we reported that as-synthesized zinc oxide is an effective electrode material of electrochemical sensor for the detection of amines.The characterization results reveal that the ZnO morphologies experienced a change from hexagonal bowl-like microparticles,cones,prisms to nanoparticles by adjusting the reaction time,temperature,solvents and additives.Interestingly,ZnO material possessing hexagonal shapes and different sizes exhibits distinct electrochemical response in various amines solution,suggesting that there is a better dependent relationship between different morphological ZnO and amines detection.Particularly,regular hexagonal ZnO nanotablets exhibit a detectable electrochemical response and selectivity to ammonia,implying it can be serve as electrode material for highly effective detection of organic amines.
