随着全球工业化进程的加速,能源消耗持续增加带来CO_(2)的过度排放,引发了严重的气候与环境问题。在众多应对措施中,以具有独特孔隙特征的MOF材料为代表的物理吸附技术成为该领域的研究热点。基于PtS型MOF材料,设计构建并优化了一系列硝...随着全球工业化进程的加速,能源消耗持续增加带来CO_(2)的过度排放,引发了严重的气候与环境问题。在众多应对措施中,以具有独特孔隙特征的MOF材料为代表的物理吸附技术成为该领域的研究热点。基于PtS型MOF材料,设计构建并优化了一系列硝基(-NO_(2))和三嗪修饰的MOF结构,通过巨正则蒙特卡洛(GCMC)理论模拟研究了不同-NO_(2)数量对MOF材料的CO_(2)气体吸附分离性能的影响。结果表明:在298K和1.0bar条件下,引入-NO_(2)后,材料对CO_(2)的捕获量从PtS的1.92mmol/g提升到了PtS-2NO_(2)的2.52mmol/g,增加-NO_(2)数量后PtS-4NO_(2)的CO_(2)吸附量提升到了5.02mmol/g,而同时修饰三嗪结构后CO_(2)吸附量达到5.93mmol/g。计算不同结构的等温吸附热、van der Waals/Coulomb相互作用和选择性等揭示了MOF结构中引入-NO_(2)对其CO_(2)选择性吸附能力的促进作用和机制,对高性能MOF基CO_(2)吸附剂材料的开发具有重要的指导意义。展开更多
Carbon nanotubes(CNTs)have garnered significant attention in the fields of science,engineering,and medicine due to their numerous advantages.The initial step towards harnessing the potential of CNTs involves their mac...Carbon nanotubes(CNTs)have garnered significant attention in the fields of science,engineering,and medicine due to their numerous advantages.The initial step towards harnessing the potential of CNTs involves their macroscopic assembly.The present study employed a gentle and direct self-assembly technique,wherein controlled growth of CNT sheaths occurred on the metal wire’s surface,followed by etching of the remaining metal to obtain the hollow tubes composed of CNTs.By controlling the growth time and temperature,it is possible to alter the thickness of the CNTs sheath.After immersing in a solution containing 1 g/L of CNTs at 60℃ for 24 h,the resulting CNTs layer achieved a thickness of up to 60μm.These hollow CNTs tubes with varying inner diameters were prepared through surface reinforcement using polymers and sacrificing metal wires,thereby exhibiting exceptional attributes such as robustness,flexibility,air tightness,and high adsorption capacity that effectively capture CO_(2) from the gas mixture.展开更多
Corrosion behaviors of P110 and N80 tubular steels in CO_(2) gas phase and supercritical(S-CO_(2))phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM,EDS,XRD,XPS and ...Corrosion behaviors of P110 and N80 tubular steels in CO_(2) gas phase and supercritical(S-CO_(2))phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM,EDS,XRD,XPS and cross-section analysis techniques.With the increase in CO_(2) partial pressure,the average corrosion rate increased first and then decreased.The average corrosion rate reached the maximum value under the near-critical pressure.When CO_(2) partial pressure further increased to be above the critical pressure,the average corrosion rate gradually decreased and local aggregation of molecules was weakened.展开更多
文摘随着全球工业化进程的加速,能源消耗持续增加带来CO_(2)的过度排放,引发了严重的气候与环境问题。在众多应对措施中,以具有独特孔隙特征的MOF材料为代表的物理吸附技术成为该领域的研究热点。基于PtS型MOF材料,设计构建并优化了一系列硝基(-NO_(2))和三嗪修饰的MOF结构,通过巨正则蒙特卡洛(GCMC)理论模拟研究了不同-NO_(2)数量对MOF材料的CO_(2)气体吸附分离性能的影响。结果表明:在298K和1.0bar条件下,引入-NO_(2)后,材料对CO_(2)的捕获量从PtS的1.92mmol/g提升到了PtS-2NO_(2)的2.52mmol/g,增加-NO_(2)数量后PtS-4NO_(2)的CO_(2)吸附量提升到了5.02mmol/g,而同时修饰三嗪结构后CO_(2)吸附量达到5.93mmol/g。计算不同结构的等温吸附热、van der Waals/Coulomb相互作用和选择性等揭示了MOF结构中引入-NO_(2)对其CO_(2)选择性吸附能力的促进作用和机制,对高性能MOF基CO_(2)吸附剂材料的开发具有重要的指导意义。
基金Project(ZCLTGS24B0101)supported by Zhejiang Provincial Natural Science Foundation of ChinaProject(Y202250501)supported by Scientific Research Fund of Zhejiang Provincial Education Department,ChinaProject supported by SRT Research Project of Jiaxing Nanhu University,China。
文摘Carbon nanotubes(CNTs)have garnered significant attention in the fields of science,engineering,and medicine due to their numerous advantages.The initial step towards harnessing the potential of CNTs involves their macroscopic assembly.The present study employed a gentle and direct self-assembly technique,wherein controlled growth of CNT sheaths occurred on the metal wire’s surface,followed by etching of the remaining metal to obtain the hollow tubes composed of CNTs.By controlling the growth time and temperature,it is possible to alter the thickness of the CNTs sheath.After immersing in a solution containing 1 g/L of CNTs at 60℃ for 24 h,the resulting CNTs layer achieved a thickness of up to 60μm.These hollow CNTs tubes with varying inner diameters were prepared through surface reinforcement using polymers and sacrificing metal wires,thereby exhibiting exceptional attributes such as robustness,flexibility,air tightness,and high adsorption capacity that effectively capture CO_(2) from the gas mixture.
基金Project(21JCQN0066)supported by the Youth Science&Technology Foundation of Sichuan Province,China。
文摘Corrosion behaviors of P110 and N80 tubular steels in CO_(2) gas phase and supercritical(S-CO_(2))phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM,EDS,XRD,XPS and cross-section analysis techniques.With the increase in CO_(2) partial pressure,the average corrosion rate increased first and then decreased.The average corrosion rate reached the maximum value under the near-critical pressure.When CO_(2) partial pressure further increased to be above the critical pressure,the average corrosion rate gradually decreased and local aggregation of molecules was weakened.
