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Graphene Oxide and Silver Ions Coassisted Zeolitic Imidazolate Framework for Antifouling and Uranium Enrichment from Seawater

2019; American Chemical Society; Volume: 7; Issue: 6 Linguagem: Inglês

10.1021/acssuschemeng.8b06391

2168-0485

Xuejie Guo, Rongrong Chen, Qi Liu, Jingyuan Liu, Hongsen Zhang, Jing Yu, Rumin Li, Milin Zhang, Jun Wang,

Chemical Synthesis and Characterization

Seawater environmental limitation from antifouling due to microorganisms presents a great challenge in uranium extraction from seawater. Herein, a bifunctional graphene oxide-silver ions-zeolitic imidazolate framework-67 composite was successfully synthesized for minimizing the effects of antifouling in the enrichment of uranium. A series of antialga assays were carried out using Phaeodactylum tricornutum as a fouling template alga. Interestingly, the adsorbents clearly display an algae inhibitory behavior with more than 80% alga death rate after 7 days, as well as enhance U(VI) adsorption performance via the coassistance of graphene oxide and silver ions. Adsorption amounts of composites reach 189.36 mg g–1 at a pH 7.0. In addition, composites still retain a high U(VI) adsorption amount which increases by 177% in comparison to the zeolitic imidazolate framework-67 at pH 8.0 (nearly seawater pH). The adsorption experiment was carried out in actual seawater, with the removal rate of U(VI) reaching nearly 70%, which proves that the graphene oxide and silver ions coassisted zeolitic imidazolate framework-67 composites are applicable to a seawater environment.