Superior removal of arsenic from water with zirconium metal-organic framework UiO-66

Chenghong Wang, Xinlei Liu, J. Paul Chen*, Kang Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

183 Scopus citations

Abstract

In this study, water stable zirconium metal-organic framework (UiO-66) has been synthesized and for the first time applied as an adsorbent to remove aquatic arsenic contamination. The as-synthesized UiO-66 adsorbent functions excellently across a broad pH range of 1 to 10, and achieves a remarkable arsenate uptake capacity of 303mg/g at the optimal pH, i.e., pH=2. To the best of our knowledge, this is the highest arsenate As(V) adsorption capacity ever reported, much higher than that of currently available adsorbents (5-280mg/g, generally less than 100mg/g). The superior arsenic uptake performance of UiO-66 adsorbent could be attributed to the highly porous crystalline structure containing zirconium oxide clusters, which provides a large contact area and plenty of active sites in unit space. Two binding sites within the adsorbent framework are proposed for arsenic species, i.e., hydroxyl group and benzenedicarboxylate ligand. At equilibrium, seven equivalent arsenic species can be captured by one Zr6 cluster through the formation of Zr-O-As coordination bonds.

Original languageEnglish
Article number16613
JournalScientific Reports
Volume5
DOIs
StatePublished - 12 Nov 2015
Externally publishedYes

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