Journal
POLYMERS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym11030495
Keywords
cellulose nanofiber aerogels; silane modification; dye removal; thermal insulators
Categories
Funding
- Universiti Sains Malaysia (USM)
- Visvesvaraya PhD scheme for Electronics and IT, Media Lab Asia, MeitY, Government of India [PhD-MLA/4(58)/201516]
- Chemical Education Department, Universitas Syiah Kuala, Indonesia
- International and Inter University centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, India
- Federal University of Uberlandia, Brazil
- Laboratoire d'Ingenierie des MAteriaux de Bretagne, Centre de Recherche Rue Saint Maude, France
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The fabrication of superadsorbent for dye adsorption is a hot research area at present. However, the development of low-cost and highly efficient superadsorbents against toxic textile dyes is still a big challenge. Here, we fabricated hydrophobic cellulose nanofiber aerogels from cellulose nanofibers through an eco-friendly silanization reaction in liquid phase, which is an extremely efficient, rapid, cheap, and environmentally friendly procedure. Moreover, the demonstrated eco-friendly silanization technique is easy to commercialize at the industrial level. Most of the works that have reported on the hydrophobic cellulose nanofiber aerogels explored their use for the elimination of oil from water. The key novelty of the present work is that the demonstrated hydrophobic cellulose nanofibers aerogels could serve as superadsorbents against toxic textile dyes such as crystal violet dye from water and insulating materials for building applications. Here, we make use of the possible hydrophobic interactions between silane-modified cellulose nanofiber aerogel and crystal violet dye for the removal of the crystal violet dye from water. With a 10 mg/L of crystal violet (CV) aqueous solution, the silane-modified cellulose nanofiber aerogel showed a high adsorption capacity value of 150 mg/g of the aerogel. The reason for this adsorption value was due to the short-range hydrophobic interaction between the silane-modified cellulose nanofiber aerogel and the hydrophobic domains in crystal violet dye molecules. Additionally, the fabricated silane-modified cellulose nanofiber hydrophobic aerogels exhibited a lower thermal conductivity value of 0.037 W center dot m(-1) K-1, which was comparable to and lower than the commercial insulators such as mineral wools (0.040 W center dot m(-1) K-1) and polystyrene foams (0.035 W center dot m(-1) K-1). We firmly believe that the demonstrated silane-modified cellulose nanofiber aerogel could yield an eco-friendly adsorbent that is agreeable to adsorbing toxic crystal violet dyes from water as well as active building thermal insulators.
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