Functionalization of nitrogen-doped graphene quantum dot:A sustainable carbon-based catalyst for the production of cyclic carbonate from epoxide and CO_(2)  

作　　者：Zahra Eshaghi Gorji Abbas Ali Khodadadi Siavash Riahi Timo Repo Yadollah Mortazavi Marianna Kemell 

机构地区：[1]Catalysis and Nanostructured Materials Research Laboratory,School of Chemical Engineering,College of Engineering,University of Tehran,Tehran 1417614411,Iran [2]Department of Chemistry,University of Helsinki,Helsinki 00014,Finland [3]Institute of Petroleum Engineering,School of Chemical Engineering,College of Engineering,University of Tehran,Tehran 1439953754,Iran

出　　处：《Journal of Environmental Sciences》2023年第4期408-422,共15页环境科学学报（英文版）

基　　金：supported by Iran National Science Foundation(No.97015707)。

摘　　要：A series of organic compounds were successfully immobilized on an N-doped graphene quantum dot (N-GQD) to prepare a multifunctional organocatalyst for coupling reaction between CO_(2)and propylene oxide (PO).The simultaneous presence of halide ions in conjunction with acidic-and basic-functional groups on the surface of the nanoparticles makes them highly active for the production of propylene carbonate (PC).The effects of variables such as catalyst loading,reaction temperature,and structure of substituents are discussed.The proposed catalysts were characterized by different techniques,including Fourier transform infrared spectroscopy (FTIR),field emission scanning electron microscopy/energy dispersive X-ray microanalysis (FESEM/EDX),thermogravimetric analysis (TGA),elemental analysis,atomic force microscopy (AFM),and ultraviolet–visible (UV-Vis) spectroscopy.Under optimal reaction conditions,3-bromopropionic acid (BPA) immobilized on N-GQD showed a remarkable activity,affording the highest yield of 98%at 140℃ and 106Pa without any co-catalyst or solvent.These new metal-free catalysts have the advantage of easy separation and reuse several times.Based on the experimental data,a plausible reaction mechanism is suggested,where the hydrogen bonding donors and halogen ion can activate the epoxide,and amine functional groups play a vital role in CO_(2)adsorption.

关 键 词：Heterogeneous organocatalyst CO_(2) Propylene carbonate N-doped graphene quantum dot Nanomaterials 

分 类 号：TQ426[化学工程] TQ225.52[环境科学与工程—环境工程] X701