Multifunctional metal organic framework and carbon nanotube-modified filter for combined ultrafine dust capture and SO2 dynamic adsorption

Shasha Feng; Xingya Li; Shuaifei Zhao; Yaoxin Hu; Zhaoxiang Zhong; Weihong Xing; Huanting Wang

doi:10.1039/C8EN01084F

Multifunctional metal organic framework and carbon nanotube-modified filter for combined ultrafine dust capture and SO₂ dynamic adsorption†

Shasha Feng,^a Xingya Li,^b Shuaifei Zhao,

^c Yaoxin Hu,^b Zhaoxiang Zhong,

*^a Weihong Xing*^a and Huanting Wang

Author affiliations

* Corresponding authors

^a State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China
E-mail: njutzzx@163.com, xingwh@njtech.edu.cn
Fax: +86 83172292
Tel: +86 83172163

^b Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia

^c Department of Environmental Sciences, Macquarie University, Sydney, NSW 2109, Australia

Abstract

Ultrafine dust and acid polar gas species (SO₂, NO_x, H₂S, etc.) in the atmosphere have severe effects on human health. They are the most important indices for air quality evaluation. In this work, we developed a multifunctional, metal organic framework (MOF: UiO-66-NH₂) and carbon nanotube (CNT)-modified filter for efficient ultrafine dust removal and acid gas adsorption. A thin layer of amine-functionalized CNTs was used to construct network skeletons on a polytetrafluoroethylene (PTFE) substrate and acted as an intermediate between the porous MOF nanoparticles and the PTFE substrate. The pore size of the filter was successfully regulated from 5.1 to 2.1 μm while the modified filter still had a high gas permeability of up to 402 m³ m⁻² h⁻¹ kPa⁻¹. This well-designed multifunctional filter showed an extremely high capture efficiency (99.997%) for ultrafine dust (diameter ∼0.3 μm) and SO₂ adsorption capacity in dynamic filtration. Our filter with hierarchical structures is very promising for indoor air purification.

This article is part of the themed collection: Nanomaterials in air

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Article information

DOI: https://doi.org/10.1039/C8EN01084F
Article type: Paper
Submitted: 26 Sep 2018
Accepted: 06 Nov 2018
First published: 07 Nov 2018

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Environ. Sci.: Nano, 2018,5, 3023-3031

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Multifunctional metal organic framework and carbon nanotube-modified filter for combined ultrafine dust capture and SO₂ dynamic adsorption

S. Feng, X. Li, S. Zhao, Y. Hu, Z. Zhong, W. Xing and H. Wang, Environ. Sci.: Nano, 2018, 5, 3023 DOI: 10.1039/C8EN01084F

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Environmental Science: Nano