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Article

Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges

1
Division of Science (Chemistry), Faculty of Science and Technology, Rajamangala University of Technology Suvarnabhumi, Phra Nakhon Si Ayutthaya 13000, Thailand
2
Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
3
Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima 30000, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Daniela Suteu
Polymers 2021, 13(23), 4110; https://doi.org/10.3390/polym13234110
Received: 31 October 2021 / Revised: 21 November 2021 / Accepted: 22 November 2021 / Published: 25 November 2021
(This article belongs to the Special Issue Polymer-Based Adsorbents)
The contamination of hydrosoluble pesticides in water could generate a serious problem for biotic and abiotic components. The removal of a hazardous agrochemical (paraquat) from water was achieved by adsorption processes using poly(vinyl alcohol)-cyclodextrin nanosponges, which were prepared with various formulations via the crosslinking between citric acid and β-cyclodextrin in the presence of poly(vinyl alcohol). The physicochemical properties of nanosponges were also characterized by different techniques, such as gravimetry, thermogravimetry, microscopy (SEM and Stereo), spectroscopy (UV-visible, NMR, ATR-FTIR, and Raman), acid-base titration, BET surface area analysis, X-ray diffraction, and ion exchange capacity. The C10D-P2 nanosponges displayed 60.2% yield, 3.14 mmol/g COOH groups, 0.335 mmol/g β-CD content, 96.4% swelling, 94.5% paraquat removal, 0.1766 m2 g−1 specific surface area, and 5.2 × 104 cm3 g1 pore volume. The presence of particular peaks referring to specific functional groups on spectroscopic spectra confirmed the successful polycondensation on the reticulated nanosponges. The pseudo second-order model (with R2 = 0.9998) and Langmuir isotherm (with R2 = 0.9979) was suitable for kinetics and isotherm using 180 min of contact time and a pH of 6.5. The maximum adsorption capacity was calculated at 112.2 mg/g. Finally, the recyclability of these nanosponges was 90.3% of paraquat removal after five regeneration times. View Full-Text
Keywords: paraquat; adsorption; nanosponges; cyclodextrin; citric acid; poly(vinyl alcohol); wastewater pollution; pseudo second-order; Langmuir isotherm; crosslinked polymer paraquat; adsorption; nanosponges; cyclodextrin; citric acid; poly(vinyl alcohol); wastewater pollution; pseudo second-order; Langmuir isotherm; crosslinked polymer
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MDPI and ACS Style

Martwong, E.; Chuetor, S.; Junthip, J. Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges. Polymers 2021, 13, 4110. https://doi.org/10.3390/polym13234110

AMA Style

Martwong E, Chuetor S, Junthip J. Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges. Polymers. 2021; 13(23):4110. https://doi.org/10.3390/polym13234110

Chicago/Turabian Style

Martwong, Ekkachai, Santi Chuetor, and Jatupol Junthip. 2021. "Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges" Polymers 13, no. 23: 4110. https://doi.org/10.3390/polym13234110

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