Chemical functionalization of chitosan biopolymer and chitosan-magnetite nanocomposite with sulfonic acid for acid-catalyzed reactions  

作　　者：Majid Masteri-Farahani Samaneh Shahsavarifar 

机构地区：[1]Research Institute of Green Chemistry,Faculty of Chemistry,Kharazmi University,Tehran,Iran

出　　处：《Chinese Journal of Chemical Engineering》2021年第11期154-161,共8页中国化学工程学报（英文版）

基　　金：The authors gratefully acknowledge financial support(H/4/361)from Kharazmi University.

摘　　要：Chemical functionalization of chitosan biopolymer and chitosan-magnetite nanocomposite was performed with sulfonic acid functional groups to achieve new solid acid materials.The sulfonic acid functional groups were created through the ring opening nucleophilic reaction of amine groups of chitosan with 1,4-butane sultone.Fourier transform infrared spectroscopy(FT-IR)and X-ray photoelectron spectroscopies(XPS)verified the successful sulfonic acid functionalization of chitosan.The obtained sulfonic acid functionalized chitosan-magnetite nanocomposite showed superparamagnetic properties according to the vibrating sample magnetometry analysis and exhibited magnetic separation feature from dispersed mixtures.Nitrogen adsorption-desorption analysis indicated the increase in surface area after formation of chitosan-magnetite nanocomposite and functionalization with sulfonic acid.Both of the prepared solid acids exhibited high catalytic activities in the acid-catalyzed acetic acid esterification with n-butanol and benzaldehyde acetalization with ethylene glycol as model reactions.Furthermore,they can be reused several times without considerable loss of their activities.

关 键 词：CHITOSAN MAGNETITE NANOSTRUCTURE Sulfonic acid Catalysis ESTERIFICATION 

分 类 号：O621.251[理学—有机化学]