期刊
ENVIRONMENTAL RESEARCH
卷 196, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.110349
关键词
Uranium; Carbon nitride; ZIF; Photo-reduction; Environmental remediation
资金
- National Natural Science Foundation of China [21876115]
- Zhejiang Provincial Natural Science Foundation of China [LGF20C030001]
The study demonstrated that the ZIF-8/g-C3N4 photocatalyst showed high efficiency in the photoreduction of U(VI) and maintained stability under different water chemistry conditions. The role of H2O2 radicals and photo-generated electrons in U(VI) photoreduction was highlighted through quenching experiments.
The development of new photocatalyst towards the highly efficient photo-reduction of U(VI) was highly desirable. In this study, ZIF-8/g-C3N4 photocatalyst was fabricated to photo-reduce U(VI) from aqueous solutions under different water chemistry. It is demonstrated that ZIF-8/g-C3N4 exhibited the fast-photocatalytic rate (completely photoreduction within 30 min), high photocatalytic activity (Kd > 105 mL/g) and superior chemical stability (No significant decrease after fifth cycles). The photoreduction rate of U(VI) significantly decreased with increasing pH, H2O2 radicals and photo-generated electrons play an important role in U(VI) photoreduction by quenching experiments and ESR analysis. According to XPS and XANES analysis, adsorbed U(VI) was partly photo-reduced into U(IV) by ZIF-8/g-C3N4 photocatalyst. The highly efficient removal of U(VI) on ZIF-8/g-C3N4 photocatalyst was attributed to the synergistic effect of ZIF-8 and g-C3N4 photocatalyst. The present study may provide a new strategy to apply new photocatalyst for in-situ photoreduction of U(VI) in actual environmental remediation.
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