Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

Due to the multiple industrial applications of chromium compounds and their dangerous nature for the environment, the development of adsorbent materials has been investigated. In line with this reality, bacterial cellulose (BC) has become a potential filler in the polymeric matrix due to its ability...

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Bibliographic Details
Published in:Journal of applied polymer science Vol. 140; no. 38
Main Authors: Maia, Lana S., Pinhati, Fernanda R., Monteceli, Francisco M., Colturato, Vitória M. M., Barbosa, Rennan F. S., Barud, Hernane S., Conceição, Monique T., Rosa, Derval S., Mulinari, Daniella R.
Format: Journal Article
Language:English
Published: Hoboken, USA John Wiley & Sons, Inc 10-10-2023
Wiley Subscription Services, Inc
Subjects:
Adsorption
adsorption isotherms
bacterial cellulose
Castor oil
Cellulose
Chromium
chromium (VI)
Chromium compounds
Contact angle
Density
Fillers
Fourier transforms
Hexavalent chromium
Industrial applications
Isotherms
Materials science
Microscopy
Optical microscopy
Polymers
Polyurethane resins
polyurethane sponge
Sorption
Sponges
Thermogravimetric analysis
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Summary:Due to the multiple industrial applications of chromium compounds and their dangerous nature for the environment, the development of adsorbent materials has been investigated. In line with this reality, bacterial cellulose (BC) has become a potential filler in the polymeric matrix due to its ability to remove toxic metals; however, its performance is little explored. This research proposes a new approach for BC as a filler in castor oil‐based polyurethane, obtaining a sponge for Cr(VI) removal. The pure PU and PU + X%BC sponges (X stands for BC content between 5 and 20 wt%) were characterized by Fourier‐transform infrared spectroscopy, scanning electron microscopy, optical microscopy, density, contact angle (CA), and thermogravimetric analysis. Sorption capacity and efficiency were evaluated as a function of the fiber content, with tests performed in function of contact time (2.5 min to 3 h) at 50 mg L−1. The BC fillers of the sponges increased the density and influenced the morphological, chemical structural, thermal, and sorption properties. Thus, the sponge (PU + 20%BC) presented the highest CA (104.4°) and the best sorption capacity and efficiency (4.3 mg g−1 and 43.2%). The sorption mechanism was well‐defined by isotherm models, presenting a maximum adsorption capacity of 23.5 mg g−1 and best fit (R2 = 0.989) with the Freundlich isotherm. The sponge is an efficient material for Cr (VI) removal and provided a promising insight into an adsorption mechanism study. Sponge for hexavalent chromium removal.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.54443