Implanting polyethylene glycol into MIL-101(Cr) as hydrophobic barrier for enhancing toluene adsorption under highly humid environment

被引：89

作者：

Wang, Jiaxing ^{[1
]}

Muhammad, Yaseen ^{[3
]}

Gao, Zhu ^{[1
]}

Shah, Syed Jalil ^{[1
]}

Nie, Shuangxi ^{[1
]}

Kuang, Lihan ^{[1
]}

Zhao, Zhongxing ^{[1
]}

Qiao, Zhiwei ^{[2
]}

Zhao, Zhenxia ^{[1
]}

机构：

[1] Guangxi Univ, Guangxi Key Lab Clean Pulp & Papermaking & Pollut, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Coll Light Ind & Food Engn,Sch Chem & Chem Engn, Nanning 530004, Peoples R China

[2] Guangzhou Univ, Guangzhou Key Lab New Energy & Green Catalysis, Sch Chem & Chem Engn, Guangzhou 510006, Peoples R China

[3] Univ Peshawar, Inst Chem Sci, Peshawar 25120, KP, Pakistan

来源：

CHEMICAL ENGINEERING JOURNAL | 2021年 / 404卷

基金：

中国国家自然科学基金;

关键词：

PEG implanted MIL-101(Cr); Hydrophobic barrier; Toluene adsorption; High humidity; H2O resistance; Breakthrough curve; METAL-ORGANIC FRAMEWORK; WATER-VAPOR; HYBRID COMPOSITE; GASEOUS TOLUENE; HIGH-CAPACITY; STABILITY; PERFORMANCE; SORPTION; KINETICS; NANOCOMPOSITES;

D O I：

10.1016/j.cej.2020.126562

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Adsorption of volatile organic compounds (VOCs) under high humidity is crucial for metal-organic frameworks (MOFs) in practical applications. To enhance competitive adsorption of VOCs under humidity, polyethylene glycol (PEG) with hydrophobic short-chains was implanted as hydrophobic barrier into MIL-101(Cr). Characterization and simulation results showed that the terminal -OH groups of PEG chains were coordinated with the Cr sites in MIL-101(Cr) and formed a hydrophobic pore (11.2 angstrom) of "cage-in-cage" geometry. PEG chains significantly hindered the diffusion of water into the MOFs while allowed toluene molecules. The new hydrophobic pores of PEG(5)@MIL-101 enhanced adsorption capacity and diffusivity for toluene by 30.8% (4.68 mmol/g at 1 mbar) and 31.5% (1.88 x 10(-2)), while decreased adsorption capacity and diffusivity for water by 53.7% and 26.8% compared to primary MOF. Breakthrough curve showed 3.3 times of toluene working capacity on PEG(5)@MIL-101 at 80% RH compared to pristine MIL-101(Cr).

引用

页数：13

共 64 条

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