生物相容性壳聚糖-氧化石墨烯气凝胶的合成、表征及其在反aza- henry型转化中的催化应用

IF 3.2 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Hossein Tavakol, Hamidreza Tarkesh
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引用次数: 0

摘要

本研究采用溶胶-凝胶法和冷冻干燥法制备了蜂窝结构的氧化石墨烯-壳聚糖气凝胶(GO-CS)。通过FTIR、TGA、BET、XRD、RAMAN、FESEM-EDS、元素映射等手段对纳米催化剂的理化性质进行了表征,证实了氧化石墨烯的-COOH基团与CS的胺基之间存在交联,并对所制备材料的表面性能和孔隙率进行了表征。所制备的气凝胶材料具有良好的热稳定性、有趣的蜂窝状结构、高孔隙率、表面官能团通用性和高表面积,这些都是催化所需的性能。接着,对制备的GO-CS在以乙醇为溶剂的β-硝基苯乙烯衍生物与水合肼(N2H4.H2O)之间的反应进行了催化活性评价。仅使用0.3 w%的气凝胶材料作为催化剂,所有20种β-硝基苯乙烯衍生物的反应在50°C下的3小时内完成,几乎定量产率(98 - 100%)。所采用的催化剂具有较高的可重复使用性,连续运行六次后,反应保持定量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis, characterization, and catalytic application of biocompatible chitosan-graphene oxide aerogel in the retro-aza-Henry-type conversion

Synthesis, characterization, and catalytic application of biocompatible chitosan-graphene oxide aerogel in the retro-aza-Henry-type conversion
In this study, graphene oxide-chitosan aerogel (GO-CS) with honeycomb structure was prepared using sol-gel and freeze-drying methods. The physicochemical properties of nanocatalyst were investigated by FTIR, TGA, BET, XRD, RAMAN, FESEM-EDS, and elemental mapping to support that cross-linking occurs between the –COOH groups of GO and amine groups of CS and examine the surface properties and porosity of the prepared material. The prepared aerogel material showed appropriate thermal stability, interesting honeycomb-like structure, high porosity, surface functional group versatility, and high surface area, which all of them are the desired properties for catalytic purposes. In continuation, the catalytic activity of the prepared GO-CS has been evaluated in the reaction between β-nitrostyrene derivatives and hydrazine hydrate (N2H4.H2O) in the ethanol as a solvent. Using only 0.3 w% of this aerogel material as a catalyst, the reactions for all 20 derivatives of β-nitrostyrenes were completed in 3 h at 50 °C in almost quantitative yields (98–100 %). The employed catalyst showed high reusability experiments and after six consecutive runs, the reaction remained quantitative.
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来源期刊
CiteScore
3.50
自引率
7.70%
发文量
492
审稿时长
3-8 weeks
期刊介绍: The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.
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