Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids

doi:10.1039/d0gc00327a

	Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids
	Liu, Yachan 1,2; Yao, Xiaoqian 2,3; Yao, Haoyu 2,3; Zhou, Qing 2,3; Xin, Jiayu 1,2,3; Lu, Xingmei 1,2,3; Zhang, Suojiang 1,2
刊名	GREEN CHEMISTRY
	2020-05-21
卷号	22 期号:10 页码:3122-3131
ISSN号	1463-9262
DOI	10.1039/d0gc00327a
英文摘要	Glycolysis of poly(ethylene terephthalate) (PET) is a prospective way for degradation of PET to its monomer bis(hydroxyethyl) terephthalate (BHET) which can be polymerized again to form new qualified PET materials, and hence provides possibilities for a permanent loop recycling. However, most of the reported glycolysis catalysts are metal-based, leading to high cost and negative environmental impact. In this study, we developed a series of choline-based ionic liquids (ILs) without metals and applied them in the glycolysis of PET as catalysts. Choline acetate ([Ch][OAc]), which is cheaper, more biologically compatible and environmentally friendly in comparison with conventional imidazolium metal-based ILs, can achieve a comparable or even better performance than them. Under optimum conditions (PET (5.0 g), ethylene glycol (EG) (20.0 g), [Ch][OAc] (5 wt%), 180 degrees C, 4 h, atmospheric pressure), the yield of BHET reached up to 85.2%. Additionally, the reaction kinetics was studied and proved to be the shrinking-core model. The apparent activation energy is 131.31 kJ mol(-1), and the pre-exponential factor is 1.21 x 10(13) min(-1). Finally, based on the experimental results and density functional theory (DFT) calculations, a possible mechanism was proposed. The promotion of the glycolysis reaction is attributed to the activation of EG by the formation of hydrogen bonds between EG and the IL.
资助项目	National Natural Scientific Fund of China[21878292] ; National Natural Scientific Fund of China[21776289] ; National Natural Scientific Fund of China[21921005] ; K. C. Wong Education Foundation[GJTD-2018-04] ; Chinese Academy of Sciences President's International Fellowship Initiative[122111WGZJTPYJY20180050] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019-A06] ; National Key Research and Development Program of China[2019YFC1908204] ; China Postdoctoral Science Foundation[2019M660797]
WOS关键词	POLYETHYLENE TEREPHTHALATE ; GLYCOLYSIS ; DEPOLYMERIZATION ; PET ; KINETICS ; WASTE ; HYDROLYSIS ; SOLVENT ; ACID
WOS研究方向	Chemistry ; Science & Technology - Other Topics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000537870500010
资助机构	National Natural Scientific Fund of China ; K. C. Wong Education Foundation ; Chinese Academy of Sciences President's International Fellowship Initiative ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences ; National Key Research and Development Program of China ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/40962]
专题	中国科学院过程工程研究所
通讯作者	Lu, Xingmei; Zhang, Suojiang
作者单位	1.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Beijing Key Lab Ion Liquids Clean Proc, State Key Lab Multiphase Complex Syst, Inst Proc Engn,CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Coll Chem & Chem Engn, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yachan,Yao, Xiaoqian,Yao, Haoyu,et al. Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids[J]. GREEN CHEMISTRY,2020,22(10):3122-3131.
APA	Liu, Yachan.,Yao, Xiaoqian.,Yao, Haoyu.,Zhou, Qing.,Xin, Jiayu.,...&Zhang, Suojiang.(2020).Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids.GREEN CHEMISTRY,22(10),3122-3131.
MLA	Liu, Yachan,et al."Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids".GREEN CHEMISTRY 22.10(2020):3122-3131.