Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-3566
Title: Efficient dye adsorption by highly porous nanofiber aerogels
Authors : Mousavi, Sara
Deuber, Fabian
Petrozzi, Sergio
Federer, Lukas
Aliabadi, Majid
Shahraki, Farhad
Adlhart, Christian
Published in : Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume(Issue) : 547
Pages : 117
Pages to: 125
Publisher / Ed. Institution : Elsevier
Issue Date: 2018
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Water purification; Nanofiber sponge; Adsorption; Mass transport; Electrospinning
Subject (DDC) : 540: Chemistry
620: Engineering
Abstract: Electrospun nanofiber membranes are frequently used in adsorption processes thanks to their high specific surface area, tailored surface functionality, and fiber uniformity. However, they are still facing challenges such as low mechanical stability and unfavorable mass transport properties. In this study, an ultra-light and robust 3D nanofiber aerogel (NFA) or nanofiber sponge with tunable porosity and flexibility was synthesized from short pullulan/polyvinyl alcohol/polyacrylic acid nanofibers using a freeze casting process followed by thermal crosslinking. We demonstrate time the application of such NFAs in batch and continuous adsorption systems and compare their performance with flat nanofiber membranes (NFM). The NFAs proved to be promising adsorbents for cationic dyes due to their high adsorption capacity (383 mg/g) and their reusability. Langmuir isotherm was a suitable model for describing the adsorption process. The endothermic system followed a pseudo second order kinetic model and intra-fiber adsorption is found to be involved in the adsorption process. Dye adsorption by 3D NFAs was four times faster than for the respective flat NFMs and when used in a continuous process as a deep-bed filter, the pressure drop through the NFA was reduced by a factor of 40 while maintaining equal adsorption performance as for the NFM.
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Publication type: Article in scientific Journal
DOI : 10.1016/j.colsurfa.2018.03.052
10.21256/zhaw-3566
ISSN: 0927-7757
URI: https://digitalcollection.zhaw.ch/handle/11475/4422
Restricted until : 2020-03-26
Appears in Collections:Publikationen Life Sciences und Facility Management

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