Functionalization of metal organic frameworks by [BMIM][CH3COO] ionic liquid for toluene capture

Ventura Castillo Ramos; Wei Han; King Lun Yeung

doi:10.1016/j.envres.2022.114341

Functionalization of metal organic frameworks by [BMIM][CH₃COO] ionic liquid for toluene capture

Environ Res. 2022 Dec;215(Pt 3):114341. doi: 10.1016/j.envres.2022.114341. Epub 2022 Sep 27.

Authors

Ventura Castillo Ramos¹, Wei Han², King Lun Yeung³

Affiliations

¹ Department of Inorganic Chemistry, Faculty of Science, University of Granada, Granada, Spain; Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong. Electronic address: vcastillo@ugr.es.
² Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen, Guangdong Province, China.
³ Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen, Guangdong Province, China; Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

PMID: 36179882
DOI: 10.1016/j.envres.2022.114341

Abstract

Indoor exposure to volatile organic compounds (VOCs) is detrimental to the health of the occupants, and their removal is crucial in maintaining good air quality. Novel adsorbents prepared by modifying Metal-Organic Frameworks (MOFs), MIL101 (Cr), UiO-66, and UiO-66-NH₂ with [BMIM][CH₃COO] ionic liquid, were characterized and tested for toluene adsorption. [BMIM][CH₃COO]/MIL101 performed best with a fast sorption rate, large sorption capacity, and good regenerability. It displays synergistic interactions between the IL and MOF. Adding one weight percent [BMIM][CH₃COO] to UiO-66 and UiO-66-NH₂ has a synergistic effect with respective 14% and 5% enhancements sorption over calculated values. The strong interactions between IL and UiO-66 and UiO-66-NH₂, as observed in their thermogravimetric data, results in poor toluene sorption for 10 wt% [BMIM][CH₃COO] loadings. This work provides a basis for IL modification of MOFs for enhanced sorption of VOCs for air treatment.

Keywords: Adsorption; Ionic liquid; Metal-organic framework; Toluene; Volatile organic compound.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Ionic Liquids*
Metal-Organic Frameworks*
Phthalic Acids
Toluene
Volatile Organic Compounds*

Substances

Ionic Liquids
Metal-Organic Frameworks
Phthalic Acids
UiO-66
Volatile Organic Compounds
Toluene