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Volume 17, No. 3, March 2017, Pages 913-922 PDF(758 KB)  Supplementary MaterialPDFPDF (491 KB)
doi: 10.4209/aaqr.2016.07.0312   

High-Performance Amino-Functional Graphene/CNT Aerogel Adsorbent for Formaldehyde Removal from Indoor Air

Jie Ma1,2, Yiran Sun1, Jinhu Yang3, Zichen Lin1, Qianying Huang1, Tian Ou1, Fei Yu2,4

1 State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
2 College of Chemistry and Environmental Engineering, Shanghai Institute of Technology, Shanghai 2001418, China
3 School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
4 Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, China

 

Highlights
  • A flexible approach prepares amino-functional graphene/CNT aerogels.
  • The breakthrough time presents a big increase (from 390 to 20300 min g–1).
  • The adsorption mechanism of formaldehyde was also studied.
  • ACGAs offers application prospects in the other indoor pollutant removal.

Abstract

 

A flexible approach prepares amino-functional graphene aerogels with different additions of carbon nanotubes (CNTs) for use as an adsorbent to study the adsorption performance of formaldehyde in indoor air. Experimental results indicated that the decoration of amino groups offers a greater number of chemical adsorption sites, which mainly contributed to the improvement of the chemical adsorption capacity of graphene aerogels, and the breakthrough time increased from 0 to 390 min g–1 under 3.7 ppm of formaldehyde. The addition of CNTs can significantly enhance the adsorption properties. More interestingly, the breakthrough time presents a substantial increase from 390 to 20,300 min g–1 when the mass ratio of CNTs and graphene increased from 0:1 to 2:1 and then decreased to 18,000 min g–1 at the ratio of 3:1. The addition of CNTs weakens the agglomeration degree and achieves a greater number of adsorption sites by playing a supportive and connective role among graphene sheets. However, more CNTs will agglomerate, and fewer functional groups on the surface limit additional amounts. The adsorption mechanism was also studied by analyzing the surface specific area and N content. This work provides new insights into the application of amino-functional graphene aerogels with the additions of CNTs (AGCAs) as a potential adsorbent to eliminate indoor formaldehyde pollution.

 

 

Keywords: Graphene; Carbon nanotube; Aerogel; Adsorbent; Formaldehyde.

 

 

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