Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characteri...Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characterized by SEM, XRD, FTIR and UV-Vis-DRS. The WO<sub>3</sub> materials were corn rod-like morphology with about 800 nm for length and 150 nm for diameter, especially there were plenty of corn particles (about 20 nm) on the surface of corn rods. The X-ray diffraction peaks of the products corresponded with WO<sub>3</sub> standard card, and the characteristic peak of W-O bond was found in the infrared spectrum. The absorption band edge of the products was about 480 nm, indicating their potential visible-light-induced photocatalytic activity. In situ FTIR technology research showed that the prepared WO<sub>3</sub> nanomaterials had visible photocatalytic activity to gas-phase toluene. After a photocatalytic reaction for 8 hours toluene was effectively degraded, and carboxylic acid and aldehyde could be regarded as the intermediate products, and CO<sub>2</sub> was produced as the final product during the reaction process.展开更多
教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与...教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与地区、高被引文献、高频突显关键词等视角,对精炼后的文献进行数据统计和可视化分析,厘清了教师专业自主的历史发展进程,突出了教师专业自主的研究重点,深入分析了教师专业自主的内涵演变历程,即从强调“独立自主”走向强调“合作自主”;从关注“教学自主”走向关注“多维自主”;从“自主作为权利”走向“自主作为责任”;从抵御“被动自主”走向呼吁“能动自主”。展开更多
运用文献计量工具CiteSpace对Web of Science(WoS)核心合集数据库收录1991—2021年发表的8985篇与工业碳排放相关的文献进行可视化分析,以期梳理该领域的研究趋势及进展,为国内工业碳排放后续研究提供前瞻性参考。结果表明:(1)自1991年...运用文献计量工具CiteSpace对Web of Science(WoS)核心合集数据库收录1991—2021年发表的8985篇与工业碳排放相关的文献进行可视化分析,以期梳理该领域的研究趋势及进展,为国内工业碳排放后续研究提供前瞻性参考。结果表明:(1)自1991年起,国际工业碳排放研究经历了萌芽、稳步提升、爆发增长三个阶段,该领域研究热度持续上升,近五年年度发文量的环比增速维持在6.01%—19.70%之间。在国际上,美国最早开始进行工业碳排放研究,我国发文量位居第一,但研究起步较晚,且我国与除澳大利亚外的国家合作较弱。(2)研究内容聚焦于“二氧化碳排放”、“大气二氧化碳”、“生态系统”、“能源消耗”等方面,“工业生态学”、“黑碳”、“可再生能源”、“城镇化”等关键词突现强度大,预计将成为该领域的研究前沿及趋势。(3)研究热点包括碳排放增长的驱动因素研究、碳排放与经济增长的脱钩效应研究、二氧化碳的捕集利用和封存等主题,体现了从理论研究到具体应用的演进过程。综上,国内学者应借鉴国际研究相关经验,在把握整体研究脉络的基础上,进一步深入挖掘研究重点、创新研究方法、加强国际交流合作,从工业碳排放角度为我国经济可持续发展提供理论依据。展开更多
Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradat...Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradation technology has made great progress. However, the development of such bismuth-based composites still remains a challenging task due to difficult recovery and low catalytic efficiency. Herein, a novel CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite was successfully synthesized through two-step hydrothermal method using activated flexible carbon cloth as a substrate. The results of the photocatalytic degradation experiments showed that the obtained CC/BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> composites can degrade 92.1% RhB in 60 min under UV-visible light irradiation, which was much higher than that of unloaded BiPO4</sub> (24.4%) and BiPO4</sub>/Bi2</sub>WO6</sub> (52.9%), exhibiting a better adsorption-photocatalytic degradation performance than BiPO4</sub> and BiPO4</sub>/Bi2</sub>WO6</sub>. Photoluminescence spectra indicated that the improved photocatalytic activity was due to the more effective inhibition of photogenerated carrier complexation. Furthermore, the radical capture experiments confirmed that h<sup>+</sup>, ·OH and O<sub>2</sub>-</sup> were the main active substances in the photocatalytic degradation process of RhB by the CC/BiPO4</sub>/Bi2</sub>WO6</sub> composites. More importantly, the prepared CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite had a simple separation process and good recycling stability, and its photocatalytic degradation efficiency can still reach 53.3% after six cycles of RhB degradation. .展开更多
文摘Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characterized by SEM, XRD, FTIR and UV-Vis-DRS. The WO<sub>3</sub> materials were corn rod-like morphology with about 800 nm for length and 150 nm for diameter, especially there were plenty of corn particles (about 20 nm) on the surface of corn rods. The X-ray diffraction peaks of the products corresponded with WO<sub>3</sub> standard card, and the characteristic peak of W-O bond was found in the infrared spectrum. The absorption band edge of the products was about 480 nm, indicating their potential visible-light-induced photocatalytic activity. In situ FTIR technology research showed that the prepared WO<sub>3</sub> nanomaterials had visible photocatalytic activity to gas-phase toluene. After a photocatalytic reaction for 8 hours toluene was effectively degraded, and carboxylic acid and aldehyde could be regarded as the intermediate products, and CO<sub>2</sub> was produced as the final product during the reaction process.
文摘教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与地区、高被引文献、高频突显关键词等视角,对精炼后的文献进行数据统计和可视化分析,厘清了教师专业自主的历史发展进程,突出了教师专业自主的研究重点,深入分析了教师专业自主的内涵演变历程,即从强调“独立自主”走向强调“合作自主”;从关注“教学自主”走向关注“多维自主”;从“自主作为权利”走向“自主作为责任”;从抵御“被动自主”走向呼吁“能动自主”。
文摘运用文献计量工具CiteSpace对Web of Science(WoS)核心合集数据库收录1991—2021年发表的8985篇与工业碳排放相关的文献进行可视化分析,以期梳理该领域的研究趋势及进展,为国内工业碳排放后续研究提供前瞻性参考。结果表明:(1)自1991年起,国际工业碳排放研究经历了萌芽、稳步提升、爆发增长三个阶段,该领域研究热度持续上升,近五年年度发文量的环比增速维持在6.01%—19.70%之间。在国际上,美国最早开始进行工业碳排放研究,我国发文量位居第一,但研究起步较晚,且我国与除澳大利亚外的国家合作较弱。(2)研究内容聚焦于“二氧化碳排放”、“大气二氧化碳”、“生态系统”、“能源消耗”等方面,“工业生态学”、“黑碳”、“可再生能源”、“城镇化”等关键词突现强度大,预计将成为该领域的研究前沿及趋势。(3)研究热点包括碳排放增长的驱动因素研究、碳排放与经济增长的脱钩效应研究、二氧化碳的捕集利用和封存等主题,体现了从理论研究到具体应用的演进过程。综上,国内学者应借鉴国际研究相关经验,在把握整体研究脉络的基础上,进一步深入挖掘研究重点、创新研究方法、加强国际交流合作,从工业碳排放角度为我国经济可持续发展提供理论依据。
文摘Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradation technology has made great progress. However, the development of such bismuth-based composites still remains a challenging task due to difficult recovery and low catalytic efficiency. Herein, a novel CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite was successfully synthesized through two-step hydrothermal method using activated flexible carbon cloth as a substrate. The results of the photocatalytic degradation experiments showed that the obtained CC/BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> composites can degrade 92.1% RhB in 60 min under UV-visible light irradiation, which was much higher than that of unloaded BiPO4</sub> (24.4%) and BiPO4</sub>/Bi2</sub>WO6</sub> (52.9%), exhibiting a better adsorption-photocatalytic degradation performance than BiPO4</sub> and BiPO4</sub>/Bi2</sub>WO6</sub>. Photoluminescence spectra indicated that the improved photocatalytic activity was due to the more effective inhibition of photogenerated carrier complexation. Furthermore, the radical capture experiments confirmed that h<sup>+</sup>, ·OH and O<sub>2</sub>-</sup> were the main active substances in the photocatalytic degradation process of RhB by the CC/BiPO4</sub>/Bi2</sub>WO6</sub> composites. More importantly, the prepared CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite had a simple separation process and good recycling stability, and its photocatalytic degradation efficiency can still reach 53.3% after six cycles of RhB degradation. .
