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Preparation of granulated UIO-66/graphene oxide using polyacrylamide/polyvinyl alcohol for selective fluoride removal: Mechanism studies via in situ surface-enhanced raman spectroscopy analysis and continuous-flow column operation

Title
Preparation of granulated UIO-66/graphene oxide using polyacrylamide/polyvinyl alcohol for selective fluoride removal: Mechanism studies via in situ surface-enhanced raman spectroscopy analysis and continuous-flow column operation
Authors
YoonSo YeonChoongChoe EarnNamSeong-NamParkChang MinYeominChoiEun HaJangMin
Ewha Authors
윤여민
SCOPUS Author ID
윤여민scopus
Issue Date
2024
Journal Title
Chemical Engineering Journal
ISSN
1385-8947JCR Link
Citation
Chemical Engineering Journal vol. 490
Keywords
AdsorptionFluoride removalGranulationGraphene oxideMetal-organic frameworkUIO-66
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The UIO-66 type of metal–organic frameworks (MOFs) showed excellent performance in water purification, however, the recovery difficulty for powdered UIO-66 remains challenging for the practical applications. Herein, we prepared granular adsorbents (gGO-U-N) derived from a UIO-66/GO composite and granulated them using polyacrylamide (PAM) and polyvinyl alcohol (PVA) polymers to improve F- removal capacity. The gGO-U-N resulted in C24O16Zr3 lattice contraction, improving the Coulomb interactions in Zr4+ for better F- interaction. Consequently, gGO-U-50 with 50 % (w/w) of UIO-66 mass ratio showed a higher F- adsorption capacity (102 mg g−1) than powdered UIO-66 (67 mg g−1), exhibiting high synergistic factor (fsyn = 2.1) for F- adsorption. Additionally, gGO-U-50 exhibited stable adsorption capability over a wide pH range and higher F- adsorption selectivity than gGO. Based on time-lapse Fourier transform infrared attenuated total reflection, X-ray photoelectron spectroscopy, and in situ Raman spectroscopic analysis, the Zr-O-C bond on gGO-U-50 was found to serve as the dominant F- sorption site, while the carbon–oxygen and amine groups contributed a minor portion for F- removal. Notably, the gGO-U-50 exhibited the F- water treatment cost of 1621.6 mg-F $-1, which is approximately 3 times cost-effective than the UIO-66 (632.07 mg-F $-1). Fixed-bed column experiments demonstrated that gGO-U-50 exhibited a higher F- adsorption capability (6.34 mg g−1) than other reported granular adsorbents, revealing that gGO-U-50 has the potential for F- remediation. © 2024 Elsevier B.V.
DOI
10.1016/j.cej.2024.151217
Appears in Collections:
공과대학 > 환경공학과 > Journal papers
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