Inspired by the natural photosynthesis systems,the integrated harnessing and conversion of CO_(2) present a promising solution for addressing the ever-rising global atmospheric concentration of CO_(2).Hollow multi-she...Inspired by the natural photosynthesis systems,the integrated harnessing and conversion of CO_(2) present a promising solution for addressing the ever-rising global atmospheric concentration of CO_(2).Hollow multi-shelled structured(HoMS)photocatalysts,featuring alternating shells and cavities,have recently gained recognition as efficient nano-reactors for capturing CO_(2) molecules and facilitating effective photoreduction within these hierarchical structures,leveraging the preeminent enrichment effect.In this work,to augment the photocatalytic efficacy of HoMS in CO_(2) treatment,highly dispersed Cu_(x)O nanoparticles(NPs)were incorporated on the CeO2 shells through a polymer-assisted impregnation method to create more active sites and strengthen the interaction between the hetero-shells and CO_(2) molecules.The photoreduction of the CO_(2)-to-CO rate under a diluted CO_(2)(15%,volume fraction)atmosphere is improved by the introduction of Cu_(x)O NPs,with the highest CO yielding rate reaching 120µmol·h^(−1)·g^(−1) without any sacrificial reagents.Further comparison experiments and theoretical calculations reveal that the Cu_(x)O NPs promote the adsorption of CO_(2) molecules in HoMS,accelerate the charge transfer efficiency,and stabilize the surface oxygen vacancies(Ovs)during the photoreduction CO_(2) conversion process.We hope these easy-to-prepare HoMS nanoreactors can contribute to the effective enrichment and valorization of CO_(2) in industrial exhaust gases.展开更多
目的为民营医疗机构的医疗风险管理及预警提供一些理论参考和实践指导,提高民营医疗机构的服务水平和社会信誉。方法计算机检索建库以来到2023年7月31日中国知网、万方、维普及Web of Science数据库收录的民营医疗机构医疗风险管理研究...目的为民营医疗机构的医疗风险管理及预警提供一些理论参考和实践指导,提高民营医疗机构的服务水平和社会信誉。方法计算机检索建库以来到2023年7月31日中国知网、万方、维普及Web of Science数据库收录的民营医疗机构医疗风险管理研究的文献。利用CiteSpace软件从文献数量、文献来源、作者机构合作、关键词共现、关键词聚类及突现来分析。结果共检出文献2635篇。其中,中文1446篇,英文1189篇。国内研究虽起步较晚,但涵盖多个学科,研究领域广泛;中文文献中期呈增长态势,但较外文文献增长趋势有所减缓,且国外作者及机构合作网络较国内更为密切,整体发展相对不足。国内外研究热点在涉及学科、研究内容等方面不同。结论需加强对民营医疗机构医疗风险管理的理论和实践研究,以加快构建适合我国民营医疗机构特点的风险管理和预警模型。未来需对道德风险、突发事件、内部控制等新兴研究领域进行深入研究。展开更多
Nanostructured N-doped TiO2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH2-MIL-125(Ti)]precursor.The success of N doping enhances light absorption and narrows the bandgap.Moreover,the as-prep...Nanostructured N-doped TiO2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH2-MIL-125(Ti)]precursor.The success of N doping enhances light absorption and narrows the bandgap.Moreover,the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF,which accelerates electron transfer.Hence,as a photocatalyst for the degradation of methylene blue(MB)under visible light irradiation,the N-doped TiO2(N-TiO2)nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018min^-1 than that of the TiO2-P25 and TiO2 under the visible light.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.51932001,52272097,and 52372170)the Beijing Natural Science Foundation,China(Nos.2242019 and 2232068)the National Key Research and Development Program of China(No.2018YFA0703503).
文摘Inspired by the natural photosynthesis systems,the integrated harnessing and conversion of CO_(2) present a promising solution for addressing the ever-rising global atmospheric concentration of CO_(2).Hollow multi-shelled structured(HoMS)photocatalysts,featuring alternating shells and cavities,have recently gained recognition as efficient nano-reactors for capturing CO_(2) molecules and facilitating effective photoreduction within these hierarchical structures,leveraging the preeminent enrichment effect.In this work,to augment the photocatalytic efficacy of HoMS in CO_(2) treatment,highly dispersed Cu_(x)O nanoparticles(NPs)were incorporated on the CeO2 shells through a polymer-assisted impregnation method to create more active sites and strengthen the interaction between the hetero-shells and CO_(2) molecules.The photoreduction of the CO_(2)-to-CO rate under a diluted CO_(2)(15%,volume fraction)atmosphere is improved by the introduction of Cu_(x)O NPs,with the highest CO yielding rate reaching 120µmol·h^(−1)·g^(−1) without any sacrificial reagents.Further comparison experiments and theoretical calculations reveal that the Cu_(x)O NPs promote the adsorption of CO_(2) molecules in HoMS,accelerate the charge transfer efficiency,and stabilize the surface oxygen vacancies(Ovs)during the photoreduction CO_(2) conversion process.We hope these easy-to-prepare HoMS nanoreactors can contribute to the effective enrichment and valorization of CO_(2) in industrial exhaust gases.
文摘目的为民营医疗机构的医疗风险管理及预警提供一些理论参考和实践指导,提高民营医疗机构的服务水平和社会信誉。方法计算机检索建库以来到2023年7月31日中国知网、万方、维普及Web of Science数据库收录的民营医疗机构医疗风险管理研究的文献。利用CiteSpace软件从文献数量、文献来源、作者机构合作、关键词共现、关键词聚类及突现来分析。结果共检出文献2635篇。其中,中文1446篇,英文1189篇。国内研究虽起步较晚,但涵盖多个学科,研究领域广泛;中文文献中期呈增长态势,但较外文文献增长趋势有所减缓,且国外作者及机构合作网络较国内更为密切,整体发展相对不足。国内外研究热点在涉及学科、研究内容等方面不同。结论需加强对民营医疗机构医疗风险管理的理论和实践研究,以加快构建适合我国民营医疗机构特点的风险管理和预警模型。未来需对道德风险、突发事件、内部控制等新兴研究领域进行深入研究。
基金the National Natural Science Foundation of China(Nos.21671016,51872024,51932001)the National Key R&D Program of China(No.2018YFA0703503)the China Postdoctoral Science Foundation(No.2019M650849)。
文摘Nanostructured N-doped TiO2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH2-MIL-125(Ti)]precursor.The success of N doping enhances light absorption and narrows the bandgap.Moreover,the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF,which accelerates electron transfer.Hence,as a photocatalyst for the degradation of methylene blue(MB)under visible light irradiation,the N-doped TiO2(N-TiO2)nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018min^-1 than that of the TiO2-P25 and TiO2 under the visible light.
