期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 426, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127834
关键词
Uranium (VI) elimination; ZIF-67; Hydroxyapatite; Adsorption mechanism
资金
- National Natural Science Foundation of China [21966004, 52064001]
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology [2020RGET08]
- Initiation Research Fund of East China University of Technology [DHBK2019109]
- Funda-mental Science on State Key Laboratory of Nuclear Resources and Environment [NRE1902]
In this work, a nanoscale hydroxyapatite-modified ZIF-67 composite, HAP/ZIF-67, was successfully synthesized using a facile ultrasound-assisted method. HAP/ZIF-67 exhibited abundant functional groups for uranium(VI) binding and showed excellent adsorption capacity and selectivity for U(VI) removal from aqueous solutions, as well as high efficiency for U(VI) elimination from real wastewater.
In this work, nanoscale hydroxyapatite (HAP)-modified ZIF-67 composite, HAP/ZIF-67, with abundant functional groups for uranium(VI) binding was synthesized via a facile ultrasound-assisted synthesis method. The prepared HAP/ZIF-67 was characterized by XRD, SEM, TEM, BET, FT-IR and XPS techniques, and was applied to eliminate uranium(VI) from aqueous solutions under various conditions, i.e., pH, coexisting ions, temperature and contact time. The results indicate that the abundant Co-OH, -C=N- and -NH- binding groups originating from the ZIF-67 and the Ca-OH and PO43- derived from loaded nanoscale HAP synergistically endowed HAP/ZIF-67 with the excellent U(VI) adsorption capacity of 453.1 mg/g, which is 2.55 and 1.78 times that of pristine HAP and ZIF-67. HAP/ZIF-67 showed high adsorption selectivity toward U(VI), and the U(VI) elimination efficiency for real wastewater by HAP/ZIF-67 reached 97.29%. The adsorption kinetics and isotherms were well simulated by the pseudo-second-order model and Langmuir isotherm model, respectively, suggesting that U(VI) adsorption was an endothermic monolayer chemisorption process. The adsorption mechanism of U (VI) by HAP/ZIF-67 was dominated by surface complexation process. This work is expected to provide an effective strategy for developing HAP-modified MOFs absorbent to be used for the highly efficient elimination of radionuclides from wastewater.
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