@article{Liu2022, 
author = {Huanhuan Liu and Jia Lei and Changyao Gong and Ye Li and Huimei Chen and Jiali Chen and Fengchun Wen and Dengjiang Fu and Yan Liu and Wenkun Zhu and Rong He},
title = {In-situ oxidized tungsten disulfide nanosheets achieve ultrafast photocatalytic extraction of uranium through hydroxyl-mediated binding and reduction},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {10},
pages = {8810-8818},
keywords = {uranium, WS2 nanosheets, hydroxyl groups, in-situ oxidization, photoreduction  ABSTRACT},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4559-0},
doi = {10.1007/s12274-022-4559-0},
abstract = {Photoreduction of hexavalent uranium (U(VI)) by semiconductor provides a novel and effective avenue for uranium extraction. Unfortunately, the traditional metal oxide and sulfide semiconductors suffer from the lack of confinement sites to U(VI), which resulted in the long period (~ 1 h) to achieve a high U(VI) extraction efficiency of > 90%. Herein, we successfully constructed WS2 nanosheets and created in-situ oxidized domains on the surfaces (O-WS2) to promote the uranium extraction and the corresponding removal kinetics. In this system, the O7.7-WS2 nanosheets exhibited a considerable U(VI) extraction efficiency of > 90% within 20 min in 8 mg·L–1 U(VI)-containing solution, which represented the highly efficient U(VI) removal performance. In 200 mg·L–1 U(VI)-containing solution, the O7.7-WS2 nanosheets exhibited an extraction capacity of 652.4 mg·g–1. The mechanism study revealed that the oxidized surface tended to trap hydrogen atom and in-situ form hydroxyl groups in defect sites. Evidenced by a series of experiment, such as kinetic isotope effect, 1H nuclear magnetic resonance (NMR) spectra, and X-ray absorption near-edge structure (XANES) spectra, the in-situ formed hydroxyl groups participated in the uranium reduction, which dramatically enhanced uranium extraction kinetics and efficiency.}
}