Towards the fastest kinetics and highest uptake of post-functionalized UiO-66 for Hg2+ removal from water
- Authors
- Lam, Iris Tsz Yan; Yuan, Yufei; Bang, Ki-Taek; Choi, Seon-Jin; Shin, Dong-Myeong; Lu, Dong; Kim, Yoonseob
- Issue Date
- Jun-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.15, no.25, pp.10558 - 10566
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 15
- Number
- 25
- Start Page
- 10558
- End Page
- 10566
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/193079
- DOI
- 10.1039/d3nr01959d
- ISSN
- 2040-3364
- Abstract
- Recent advances in adsorbents have improved the removal of mercury ions from wastewater. Metal-organic frameworks (MOFs) have been increasingly used as adsorbents due to their high adsorption capacity and ability to adsorb various heavy metal ions. UiO-66 (Zr) MOFs are mainly used because they are highly stable in aqueous solutions. However, most functionalized UiO-66 materials are unable to achieve a high adsorption capacity because of the undesired reactions that occur during post-functionalization. Herein, we report a facile post-functionalization method to synthesize a MOF adsorbent with fully active amide- and thiol-functionalized chelating groups, termed UiO-66-A.T. UiO-66-A.T. was synthesized via a two-step reaction by crosslinking with a monomer containing a disulfide moiety, followed by disulfide cleavage to activate the thiol groups. UiO-66-A.T. removed Hg2+ from water with a maximum adsorption capacity of 691 mg g(-1) and a rate constant of 0.28 g mg(-1) min(-1) at pH 1. In a mixed solution containing 10 different heavy metal ions, UiO-66-A.T. has a Hg2+ selectivity of 99.4%, which is the highest reported to date. These results demonstrate the effectiveness of our design strategy for synthesizing purely defined MOFs to achieve the best Hg2+ removal performance to date among post-functionalized UiO-66-type MOF adsorbents.
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