Cellulose nanofibril/PVA/bamboo activated charcoal aerogel sheet with excellent capture for PM2.5 and thermal stability

Keyu Zhao; Changying Ren; Youwei Lu; Qijun Zhang; Qiang Wu; Siqun Wang; Chunping Dai; Wenbiao Zhang; Jingda Huang

doi:10.1016/j.carbpol.2022.119625

Cellulose nanofibril/PVA/bamboo activated charcoal aerogel sheet with excellent capture for PM2.5 and thermal stability

Carbohydr Polym. 2022 Sep 1:291:119625. doi: 10.1016/j.carbpol.2022.119625. Epub 2022 May 16.

Authors

Keyu Zhao¹, Changying Ren¹, Youwei Lu¹, Qijun Zhang², Qiang Wu¹, Siqun Wang³, Chunping Dai⁴, Wenbiao Zhang⁵, Jingda Huang⁶

Affiliations

¹ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China.
² Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
³ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China; Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996, USA.
⁴ Faculty of Forestry, University of British Columbia, Vancouver, V6T 1Z4, Canada.
⁵ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China. Electronic address: zwb@zafu.edu.cn.
⁶ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China; College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China. Electronic address: jdhuang@zafu.edu.cn.

PMID: 35698417
DOI: 10.1016/j.carbpol.2022.119625

Abstract

It is still a challenge to prepare air filtration materials with high filtration efficiency and good thermal stability from renewable materials. In this study, cellulose nanofibril (CNF), poly (vinyl alcohol) (PVA), and bamboo activated charcoal (BAC) were used to build an air filtration system with double filtration by mixing and freeze-drying. The resulting CNF/PVA/BAC aerogel sheet reached a filtration efficiency of 99.69% for PM2.5 due to its double filtration from the network structure of CNF and electrostatic adsorption of BAC. The composite material also showed high thermal stability with its filtration efficiency over 95% even after exposure to 200 °C. After modification, the hydrophobic CNF/PVA/BAC filtration sheet could be reused for over 5 times by water washing whereby the filtration efficiency remained above 95%. The environmentally friendliness excellent filtration efficiency and simplistic fabrication make the aerogel sheet a potential material choice to cope with the severe air pollution today.

Keywords: Aerogel sheet; Bamboo activated charcoal; Cellulose nanofibril; PM2.5; Poly (vinyl alcohol).

MeSH terms

Cellulose* / chemistry
Charcoal*
Hydrophobic and Hydrophilic Interactions
Particulate Matter
Polyvinyl Alcohol / chemistry

Substances

Particulate Matter
Charcoal
Polyvinyl Alcohol
Cellulose