Journal of Inorganic Materials, Volume. 35, Issue 3, 359(2020)
Reduction of soluble U(VI) to insoluble U(IV) oxide is an effective approach to control uranium contamination. Three-dimensional (3D) macroporous g-C3N4 photocatalyst with interconnected porous was prepared by thermal polymerization and template etching using self-assembly of SiO2 nanosphere as the template. The material was then applied to adsorption-photocatalytic reduction of U(VI). Characterization results showed that the 3D macroporous g-C3N4 photocatalyst presented a well-defined interconnected macroporous architecture and numerous nanopores existed on the well-defined macroporous skeleton. 3D macroporous g-C3N4 also had a significant increase in specific surface area which was beneficial to the absorption of visible light. Adsorption results showed that the maximum adsorption capacity of U(VI) on 3D macroporous g-C3N4 was ~30.5 mg/g, which was more than ~1.83 times higher than that of bulk g-C3N4. The adsorption isotherm matched well with the Langumuir equation. Photocatalytic reduction experiments showed that the 3D macroporous g-C3N4 had high photocatalytic activity and good stability with the reduction rate constant of 0.0142 min -1, which was ~4.9 times higher than bulk g-C3N4 (~0.0024 min -1). As the sorption-photocatalytic performance of the sample is excellent, 3D macroporous g-C3N4 is a high efficient visible-light-responsive photocatalyst for the removal of U(VI) from radioactive wastewater.
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Li JIANG, Huihui GAO, Ruya CAO, Shouwei ZHANG, Jiaxing LI.
Category: RESEARCH PAPER
Received: Jul. 5, 2019
Accepted: --
Published Online: Jan. 27, 2021
The Author Email: ZHANG Shouwei (sps_zhangsw@ujn.edu.cn), LI Jiaxing (lijx@ipp.ac.cn)