Direct synthesis of zeolitic imidazolate framework-8/chitosan composites in chitosan hydrogels

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• 作者：Jianfeng Yao ; ^{jianfeng.yao@monash.edu} ; Rizhi Chen ; Kun Wang ; Huanting Wang ; ^{huanting.wang@monash.edu}
• 关键词：Zeolitic imidazolate framework-8 ; Chitosan ; Polymer hydrogel ; Crystallization
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：165
• 期：Complete
• 页码：200-204
• 全文大小：928 K

文摘

Zeolitic imidazolate framework-8 (ZIF-8)/chitosan composites were prepared in the chitosan hydrogels. The concentrations of the chitosan and the alkaline solution were varied to the synthesis of the ZIF-8/chitosan composites. In the chitosan hydrogels with the addition of ammonium hydroxide solution, the resulting ZIF-8 crystals exhibited an unusual XRD structure that the XRD peak at about 18^o (2 2 2) became the strongest. The XRD peak intensity ratio of (2 2 2)/(0 1 1) increased from 0.68 to 1.5-5.2 in the presence of chitosan hydrogels. ZIF-8/chitosan composites (FC2) were composed of aggregated nanosized particles, and exhibited a higher CO₂ adsorption than normal ZIF-8 crystals. After removing chitosan from FC2, XRD pattern of the resulting ZIF-8 crystals returned to the normal state and the morphology kept the same as the composite.