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Hydrophobic composite foams based on nanocellulose-sepiolite for oil sorption applications
- Source :
- Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Centro de Investigación Forestal (CIFOR)<br />TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl)-oxidized cellulose nanofibers (CNF) were assembled to fibrous clay sepiolite (SEP) by means of a high shear homogenizer and an ultrasound treatment followed by lyophilization using three different methods: normal freezing, directional freezing, and a sequential combination of both methods. Methyltrimethoxysilane (MTMS) was grafted to the foam surface by the vapor deposition method to introduce hydrophobicity to the resulting materials. Both the SEP addition (for the normal and directional freezing methods) and the refreezing preparation procedure enhanced the compressive strength of the foams, showing compressive moduli in the range from 28 to 103 kPa for foams loaded with 20% w/w sepiolite. Mercury intrusion porosimetry shows that the average pore diameters were in the range of 30-45 µm depending on the freezing method. This large porosity leads to materials with very low apparent density, around 6 mg/cm3, and very high porosity >99.5%. In addition, water contact angle measurement and Fourier-transform infrared spectroscopy (FTIR) were applied to confirm the foam hydrophobicity, which is suitable for use as an oil sorbent. The sorption ability of these composite foams has been tested using olive and motor oils as models of organophilic liquid adsorbates, observing a maximum sorption capacity of 138 and 90 g/g, respectively.<br />This work was supported by Vidyasirimedhi Institute of Science and Technology (VISTEC), and funds (projects: MAT2015-71117-R and PID2019-105479RB-I00) from the Agencia Estatal de Investigación (AEI, Spain) and the FEDER Program (EU). R. M.-S. acknowledges the MINECO (Spain) for a “Juan de la Cierva-Incorporación” contract (IJCI-2016-28403) and B.W. thanks the AEI for a JIN project (PID2019-107022RJ-I00). Authors thank the Agencia Estatal CSIC (Spain) for supporting the Open Access publication.
- Subjects :
- Bionanocomposites
Environmental Engineering
Materials science
Methyltrimethoxysilane
Health, Toxicology and Mutagenesis
Sepiolite
Composite number
Nanofibers
0211 other engineering and technologies
02 engineering and technology
010501 environmental sciences
01 natural sciences
Nanocellulose
Contact angle
chemistry.chemical_compound
Magnesium Silicates
Environmental Chemistry
Porosity
Waste Management and Disposal
0105 earth and related environmental sciences
021110 strategic, defence & security studies
Sorption
Pollution
Compressive strength
Hydrophobic Foam
chemistry
Chemical engineering
Oil sorption
Hydrophobic and Hydrophilic Interactions
Oils
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 417
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....036b6e182addc654a7a572628dc18b10