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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
- Yoon; So Yeon; Choong; Choe Earn; Nam; Seong-Nam; Park; Chang Min; Yeomin; Choi; Eun Ha; Jang; Min
- Ewha Authors
- 윤여민
- SCOPUS Author ID
- 윤여민
- Issue Date
- 2024
- Journal Title
- Chemical Engineering Journal
- ISSN
- 1385-8947
- Citation
- Chemical Engineering Journal vol. 490
- Keywords
- Adsorption; Fluoride removal; Granulation; Graphene oxide; Metal-organic framework; UIO-66
- Indexed
- SCIE; 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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