Amidoxime-functionalized zeolitic imidazolate frameworks with antimicrobial property for the removal of U (VI) from wastewater. Issue 5 (October 2022)

• Record Type: Journal Article
• Authors: Sang, Kexiao; Mei, Douchao; Wang, Yudan; Liu, Lijia; Li, Huan; Yang, Guoxing; Ma, Fuqiu; Zhang, Chunhong; Dong, Hongxing
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 5(2022)
• Publication Date: 2022-10
• Subjects: Adsorption -- ZIF -- Amidoxime -- U (VI) -- Wastewater -- Antibacterial; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108344
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The removal of U (VI) from wastewater is an arduous technological task wherein biofouling caused by microorganisms severely depletes the relevant properties of adsorbents. Herein, the zeolitic imidazole frameworks dubbed ZIF-90 were functionalized with amidoxime via the production of a diaminomaleonitrile intermediate to manufacture a highly efficient U (VI)-adsorbing material with antibacterial properties called amidoxime-appended ZIF-90 (ZIF-90-A ). The crystal and pore structures of ZIF-90 and its modified materials were characterized by FT-IR, XRD, SEM, XPS and BET. ZIF-90-A has a superior uranium-uptake capacity (490.2 mg/g) at pH 5, which is close to the pH of wastewater. At the same time, ZIF-90-A also exhibited outstanding antimicrobial properties. Values for the minimum inhibitory concentration (MIC) of ZIF-90-A were measured to be 125 and 250 μg/mL against Staphylococcus aureus and Escherichia coli, respectively. In addition, ZIF-90-A displayed good selectivity for the adsorption of UO2 2+ ; moreover, the uranium-uptake capacity of ZIF-90-A did not exhibit an obvious reduction when the adsorbent was subjected to five adsorption–desorption cycles. These results suggest that ZIF-90-A is a viable choice for the efficient removal of U (VI) from nuclear wastewater. Graphical Abstract: ga1 Highlights: A novel U (VI) adsorbent ZIF-90-A with good anti-fouling property is prepared. ZIF-90-A shows good antimicrobial activity against S. aureus and E. coli (MICs = 125 ~ 250 μg/mL). ZIF-90-A shows efficient U (VI) adsorption performance (Qe = 490.2 mg/g, pH = 5). The possible mechanisms of U (VI) adsorption and antimicrobial are illustrated.