Chitosan and functionalized graphene oxide nanocomposite as a novel and highly efficient catalyst for production of bis-coumarins under solvent-free conditions

被引:7
作者
Atashrouz, Zhale [1 ]
Rostami, Esmael [1 ]
Zare, Abdolkarim [1 ]
机构
[1] Payame Noor Univ, Dept Chem, POB 19395-3697, Tehran, Iran
关键词
4-hydroxycoumarin; Bis-coumarin; Chitosan nanocatalyst; Graphene oxide nanocomposite; Solvent-free synthesis; IONIC LIQUID; FT-IR; GREEN SYNTHESIS; DERIVATIVES; ACID; BISCOUMARIN; REMOVAL; ADSORPTION; ADSORBENT; SPECTRA;
D O I
10.1007/s11164-021-04616-2
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Chitosan and functionalized graphene oxide nanocomposite was used as efficient, sustainable, and recyclable catalyst in the production of bis-coumarins using 4-hydroxycoumarin and aromatic aldehydes under solvent-free conditions. Chitosan was first functionalized using chloroacetyl chloride. Afterward, graphene oxide was modified by aliphatic amine and then with dithioglycolic acid, giving rise to thiol (SH)-functionalized graphene oxide after reduction. The nanocomposite was prepared from the reaction of 2-chloroacetyl-functionalized chitosan and thiol-modified graphene oxide, followed by oxidization of thiols to SO3H groups using hydrogen peroxide. The nanocomposite (catalyst) was characterized using field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetric analysis, differential thermogravimetry, FT-IR, and MAP analysis. The nanocomposite showed superior properties over previously reported ones, including nontoxicity, environmental compatibility, solvent-free condition, simple work-up, no by-products, thermal stability, and recoverability.
引用
收藏
页码:179 / 201
页数:23
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