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Nanocellulose-Zeolite Composite Films for Odor Elimination
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-0323-0210
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Free standing and strong odor-removing composite films of cellulose nanofibrils (CNF) with a high content of nanoporous zeolite adsorbents have been produced by colloidal processing. Thermogravimetric desorption analysis (TGA) and infrared spectroscopy combined with computational simulations showed that three commercially available zeolites- silicalite, ZSM5 and zeolite Y, have a high affinity and uptake of important odors like ethanethiol and propanethiol, also in the presence of water. Highly flexible and strong free standing zeolite-CNF films with a thickness up to 115 μm and an adsorbent loading above 80 w/w% were obtained by gelation and vacuum filtration. Zeolite-CNF films displayed high mechanical strength of up to 10 MPa. Headspace solid phase microextraction (SPME) coupled to gas chromatography- mass spectroscopy (GC-MS) analysis showed that the CNF-zeolite films can eliminate volatile thiol-based odors to concentrations below the detection ability of the human olfactory system. The odor-removing performance of the zeolite-cellulose nanofibril films could enable improved transport and storage of fruits and vegetables rich in odors, e.g. onion and the tasty but foul-smelling South-East Asian Durian fruit.

National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-109195OAI: oai:DiVA.org:su-109195DiVA: diva2:763460
Available from: 2014-11-14 Created: 2014-11-14 Last updated: 2016-01-29Bibliographically approved
In thesis
1. Structuring porous adsorbents and composites for gas separation and odor removal
Open this publication in new window or tab >>Structuring porous adsorbents and composites for gas separation and odor removal
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Porous zeolite, carbon and aluminophosphate powders have been colloidally assembled and post-processed in the form of monoliths, flexible free standing films and coatings for gas separation and odor removal. Zeolite 13X monoliths with macroporosites up to 50 vol% and a high CO2 uptake were prepared by colloidal processing and sacrificial templating. The durability of silicalite-I supports produced in a binder-free form by pulsed current processing (PCP) were compared with silicalite-I supports produced using clay-binders and conventional thermal treatment. Long-term acid and alkali treatment of the silicalite-I substrates resulted in removal of the clay binder and broadened the size-distribution of the interparticle macropores. Furthermore, strong discs of hydrothermally treated beer waste (HTC-BW) were produced by PCP and the discs were activated by physical activation in CO2 at high temperatures. The activated carbon discs showed high strength up to 7.2 MPa while containing large volume of porosities at all length scales. PCP was further used to structure aluminomphosphate powders (AlPO4-17 and AlPO4-53) into strong functional monoliths. The aluminophosphate monoliths had strengths of 1 MPa, high CO2 uptake and were easy to regenerate. Zeolite Y, silicalite and ZSM5 were selected as potential zeolite adsorbents for removal of sulfur containing compound, e.g. ethyl mercaptan (EM) and propyl mercaptan (PM). A novel processing procedure was used to fabricate free-standing films and coatings of cellulose nanofibrils (CNF) with a high content of nanoporous zeolite; 89 w/w% and 96 w/w%, respectively. Thin flexible free-standing films and coatings of zeolite-CNF on paperboards with thickness around 100 µm and 40 µm, respectively, were produced. Headspace solid phase microextraction (SPME) coupled to gas chromatography- mass spectroscopy (GC/MS) analysis showed that the zeolite-CNF films can efficiently remove considerable amount of odors below concentration levels that can be sensed by the human olfactory system.

Place, publisher, year, edition, pages
Stockholm, Sweden: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2014. 62 p.
Keyword
Structure, pulsed current processing, zeolite, aluminophosphate, activated carbon, CO2 separation, adsorption, durability, cellulose, film, coating
National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
urn:nbn:se:su:diva-109179 (URN)978-91-7649-005-1 (ISBN)
Public defence
2014-12-16, Magnélisalen, Arrhenius Laboratory, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
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Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.

Available from: 2014-11-24 Created: 2014-11-14 Last updated: 2014-11-23Bibliographically approved

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Keshavarzi, NedaMashayekhy Rad, FarshidMace, AmberAkhtar, FaridNilsson, UlrikaBergström, Lennart
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