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Title: Synthesis, characterization and sorption studies of aromatic compounds by hydrogels of chitosan blended with β-cyclodextrin- and PVA-functionalized pectin
Authors: Filho, Cesar M. C.
Bueno, Pedro V. A.
Matsushita, Alan F. Y. 
Rubira, Adley F. 
Muniz, Edvani C. 
Durães, Luisa 
Murtinho, Dina M. B. 
Valente, Artur J. M. 
Issue Date: 2018
Publisher: Royal Society of Chemistry
Project: Cesar Filho and Alan Matsushita acknowledge nancial support from Conselho Nacional de Desenvolvimento Cient´ıco e Tecnol ´ogico (CNPq- Brazil) – Science without borders Program through the PhD grants (246079/2012-6 and 249241/2013-7, respectively). We are indebted to Professor S´ergio Seixas de Melo for his support for the HPLC measurements. This work was funded by the Coimbra Chemistry Centre, which is supported by the Fundaç˜ao para a Ciˆencia e a Tecnologia (FCT) through the programmes UID/QUI/UI0313/2013 and COMPETE, and by Portuguese funds through FCT in the framework of the project WaterJPI/0006/2016. Access to TAIL-UC facility funded under QREN-Mais Centro Project ICT/2009/02/012/1890 is gratefully acknowledged. NMR data was collected at the UCNMR facility which is supported in part by FEDER – European Regional Development Fund through the COMPETE Programme (Operational Programme for Competitiveness) and by National Funds through FCT -Fundaç˜ao para a Ciˆencia e a Tecnologia and Rede Nacional de Ressonˆancia Magn´etica Nuclear (RNRMN). 
Serial title, monograph or event: RSC Advances
Volume: 8
Issue: 26
Abstract: Petroleum comprises the monoaromatic and polycyclic aromatic hydrocarbons, which exhibit acute toxicity towards living animals. Consequently, their removal from natural environment is a priority challenge. On the other hand, biomaterials are increasingly being used as adsorbents. Pectin and chitosan are well-known polysaccharides able to form coacervate hydrogels. Aiming an increase of sorption ability by hydrophobic compounds, pectin was also functionalized with two amphiphilic compounds: b-cyclodextrin (b-CD) and poly(vinyl alcohol) (PVA). Both the modified pectin and the hydrogels were evaluated using nuclear magnetic resonance (NMR), infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The hydrogels were further characterized in terms of thermogravimetric analysis (TGA) and swelling kinetics. The interaction between the hydrogel and mix solutions containing six different aromatic compounds (BTXs and the following PAHs: pyrene, benzo(b) fluoranthene and benzo(a)pyrene) has been evaluated through sorption isotherms and kinetics. The mechanism of sorption interaction and the selectivity of the adsorbents towards different aromatic compounds were discussed. The results clearly show that the presence of b-CD and PVA into gel leads to an increase in the removal efficiency of both, BTXs and PAHs. The gels were subjected to two sorption/desorption cycles to have an assessment of the capability of adsorbents for re-use. Finally, the sorption quantification of those six aromatic compounds from a real gasoline sample onto gels has been tested.
ISSN: 2046-2069
DOI: 10.1039/C8RA02332H
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais
I&D CQC - Artigos em Revistas Internacionais

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