排序方式: 共有77条查询结果,搜索用时 93 毫秒
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选用1-乙烯基-3-乙基咪唑四氟硼酸盐([VElm]BF4,一种离子液体)作为功能单体,以Co2+为介导离子,结合1-丁基-3-甲基咪唑四氟硼酸盐([BMIM]BF4)/二甲基亚砜(DMSO)二元致孔体系制备了绿原酸印迹整体柱。经过对制备参数的考察,确定最佳比例为绿原酸:Co2+:[VElm]BF4:EDMA(乙二醇二甲基丙烯酸酯)(摩尔比)=1:1:5:20,[BMIM]BF4:DMSO=3:1(V/V),最大印迹因子达2.10。通过优化色谱条件,最终在乙腈:20 mmol/L乙酸钠缓冲液(pH 4.2)=70:30(V/V)时实现了绿原酸及其类似物的完全分离。由此可见,以离子液体为功能单体及致孔剂,在金属介导策略下制备的分子印迹聚合物可实现绿原酸的特异性识别及分离。 相似文献
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Zhijia Liu Benhua Fei Zehui Jiang Zhiyong Cai Yan Yu Xing’e Liu 《Journal of Thermal Analysis and Calorimetry》2013,111(1):393-399
Moso bamboo (Phyllostachys pubescens) and sinocalamus affinis (Phyllostachys heterocycla) were used in the research. Thermogravimetry (TG), a combination of TG and Fourier transform infrared spectrometer (TG–FTIR), X-ray diffraction (XRD), and differential thermal analysis (DTA) were used to investigate thermal decomposition of bamboo. The calorific value and smoke release process of both bamboos were also tested, respectively. The results from TG indicated that degradation process of sinocalamus affinis and moso bamboo was similar, but their degradation temperatures were different. The main decomposition occurred in the second step and about 68.70 and 64.63% masses degraded for sinocalamus affinis and moso bamboo, whose temperature of maximum mass loss was 319 and 339 °C, respectively. DTA curve showed that the thermal decomposition of both bamboos was an absorbance heat process. TG–FTIR analysis showed that the main pyrolysis products of both bamboos were similar, including absorbed water (H2O), methane gas (CH4), carbon dioxide (CO2), acids and aldehydes, ammonia gas (NH3). The calorific value of moso bamboo (19,291 J g?1 K?1) was higher than that of sinocalamus affinis (18,082 J g?1 K?1). The initial time of smoke release process of moso bamboo was later, and its maximum smoke density was higher than that of sinocalamus affinis. The difference was probably attributed to different compositions and structure of sinocalamus affinis and moso bamboo. The results from this research are very helpful to better design manufacturing process of bio-energy, made from bamboo, by gasification and pyrolysis methods. 相似文献
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Xupo Liu Yunfeng Zhang Shaofeng Deng Cuicui Li Jiaming Dong Jiaying Wang Zehui Yang Deli Wang Hansong Cheng 《中国化学快报》2019,30(2):299-304
Semi-IPNs were constructed by forming the crosslinking networks via the reaction between BPPO and diamine cross-linkers to overcome the dimensional swelling and methanol-permeation issues of SPEEK. 相似文献
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An efficient hetero-cross-dehydrogenative-coupling (hetero-CDC) reaction between N-protected indoles and phosphites to 2-indolyphosphites is described. The regioselective methodology took place in the presence of photo redox catalyst Ru(bpy)3(PF6)2 combined with oxygen as an clean oxidant when exposed to visible light, furnishing the 2-indolyphosphites as the exclusive products in moderate to good yields with good functional group tolerance. Moreover, the phosphonylation protocol was proved by the control reaction to proceed through the radical pathway. 相似文献