Tian Yun, Xu Luowen, Ning Shuo, Wang Changfu, Wang Yun, Jiang Hao, Yuan Dingzhong, Yu Fengtao, Liu Yan
Jiangxi Province Key Laboratory of Functional Organic Polymers, East China University of Technology, Nanchang 330013, Jiangxi, China.
Jiangxi Province Key Laboratory of Functional Organic Polymers, East China University of Technology, Nanchang 330013, Jiangxi, China.
J Colloid Interface Sci. 2025 Jan;677(Pt A):470-480. doi: 10.1016/j.jcis.2024.07.238. Epub 2024 Jul 31.
Photocatalysis has emerged as a extremely promising green technology for the treatment of uranium-containing wastewater. This study focuses on the fabrication of TiCT/CdZnS composites with Schottky junctions through the in-situ growth of CdZnS on TiCT nanosheets, enabling efficient photoreduction of U(VI) without the requirement of sacrificial agents. The results demonstrate that the TiCT/CdZnS composites achieve remarkable 99.48 % U(VI) reduction efficiency within 60 min in a 100 ppm uranium solution. Furthermore, the removal rate remains above 90 % after five cycles. The formation of Schottky heterojunctions by TiCT and CdZnS leads to the generation of an internal electric field that significantly promotes the rapid separation and transfer of photogenerated carriers, thereby enhancing the photocatalytic reduction efficiency of TiCT/CdZnS-3:100 (TC/CZS-3:100). A considerable amount of electrons accumulate on TiCT via the Schottky barrier, effectively facilitating the reduction of U(VI) to U(IV). As a co-catalyst, TiCT enhances the photocatalytic performance and stability of CdZnS. Moreover, the practical application in the waste liquid of rare earth tailings reveals that the removal rate can be as high as 91.24 %. This research is of significant value in the development of effective photocatalysts for the elimination of uranium from wastewater.
光催化已成为一种极具前景的处理含铀废水的绿色技术。本研究聚焦于通过在TiCT纳米片上原位生长CdZnS来制备具有肖特基结的TiCT/CdZnS复合材料，从而能够在无需牺牲剂的情况下高效光还原U(VI)。结果表明，TiCT/CdZnS复合材料在100 ppm铀溶液中60分钟内实现了高达99.48%的U(VI)还原效率。此外，经过五个循环后去除率仍保持在90%以上。TiCT和CdZnS形成的肖特基异质结导致产生内建电场，显著促进光生载流子的快速分离和转移，从而提高了TiCT/CdZnS-3:100（TC/CZS-3:100）的光催化还原效率。大量电子通过肖特基势垒在TiCT上积累，有效促进了U(VI)还原为U(IV)。作为助催化剂，TiCT提高了CdZnS的光催化性能和稳定性。此外，在稀土尾矿废液中的实际应用表明去除率可高达91.24%。本研究对于开发从废水中去除铀的有效光催化剂具有重要价值。
