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
The polystyrene supported glutamic acid Schiff base complex of Mn ( Ⅱ ) (PS-Sal-Glue-Mn) was prepared with chloromethylated styrene polymer beads, 2,4-dihydroxybenzaldehyde, L-glutamic acid and manganese ( Ⅱ )...The polystyrene supported glutamic acid Schiff base complex of Mn ( Ⅱ ) (PS-Sal-Glue-Mn) was prepared with chloromethylated styrene polymer beads, 2,4-dihydroxybenzaldehyde, L-glutamic acid and manganese ( Ⅱ ) acetate tetrahyrate. The polymeric ligand and the complex were characterized by FT-IR, small area X-ray photoelectron spectroscopy (XPS) and 1CP-AES. In the presence of the manganese complex, cyclohexene (1) was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2-cyclohexen-l-ol (2), 2-cyclohexen-l-one (3) and 2-cyclohexen-1- hydroperoxide (4), which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-1-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.展开更多
文摘目的 探究芪地桃蛭二蝉方联合他克莫司治疗膜性肾病的效果及对抗磷脂酶A2受体(PLA2R)、B淋巴细胞活化因子(BAFF)及白细胞介素-6(IL-6)水平的影响。方法 选取2017年11月至2020年4月收治的84例膜性肾病患者为研究对象,将其随机分为对照组与联合组,各42例。对照组给予基础治疗加他克莫司治疗,联合组在对照组基础上加芪地桃蛭二蝉方治疗。比较两组的治疗效果。结果 联合组的治疗总有效率高于对照组,差异具有统计学意义(P<0.05)。治疗前,两组的24 h尿蛋白定量(24 h UPQ)、人血清白蛋白(HSA)、血清肌酐浓度(Scr)水平比较,差异无统计学意义(P>0.05);治疗后,两组的24 h UPQ、Scr水平均明显降低,HSA水平均明显升高,且联合组优于对照组,差异具有统计学意义(P<0.05)。治疗前,两组的PLA2R、BAFF及IL-6水平比较,差异无统计学意义(P>0.05);治疗后,两组的PLA2R、BAFF及IL-6水平均明显降低,且联合组低于对照组,差异具有统计学意义(P<0.05)。联合组的不良反应总发生率低于对照组,差异具有统计学意义(P<0.05)。结论 芪地桃蛭二蝉方联合他克莫司治疗膜性肾病效果显著,能够明显降低PLA2R、BAFF及IL-6水平,安全可靠,值得推广。
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。
文摘The polystyrene supported glutamic acid Schiff base complex of Mn ( Ⅱ ) (PS-Sal-Glue-Mn) was prepared with chloromethylated styrene polymer beads, 2,4-dihydroxybenzaldehyde, L-glutamic acid and manganese ( Ⅱ ) acetate tetrahyrate. The polymeric ligand and the complex were characterized by FT-IR, small area X-ray photoelectron spectroscopy (XPS) and 1CP-AES. In the presence of the manganese complex, cyclohexene (1) was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2-cyclohexen-l-ol (2), 2-cyclohexen-l-one (3) and 2-cyclohexen-1- hydroperoxide (4), which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-1-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.