Chen Bo, Zhang Guikai, Chen Lang, Kang Jinyang, Wang Yuanhua, Chen Shanyong, Jin Yongdong, Yan Hongjian, Xia Chuanqin
College of Chemistry, Sichuan University, Chengdu 610064, PR China.
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China.
J Hazard Mater. 2022 Mar 15;426:127851. doi: 10.1016/j.jhazmat.2021.127851. Epub 2021 Nov 21.
Photocatalytic reduction and removal of toxic uranium(VI) from aqueous solution is a highly economic, non-pollutant and efficient strategy. However, most uranium containing waste waters are highly acidic, but current photocatalysts are still restricted in slightly acidic or neutral media (pH ≥ 4). Herein, a conjugated microporous polymer (CMP), pTTT-Ben, was used for visible light driven photocatalytic reduction of U(VI) in highly acidic condition (pH = 1). A high uranium removal capacity (4710 mg/g) was achieved. The structural information of reduced uranium was investigated by X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS), revealing the amorphous U(IV) hydrate complex, with an additional interaction between U(IV) and nitrogen atoms on pTTT-Ben. In addition, pTTT-Ben also showed excellent photocatalytic U(VI) reduction performance under natural sunlight irradiation.
光催化还原及从水溶液中去除有毒的铀(VI)是一种高度经济、无污染且高效的策略。然而，大多数含铀废水呈强酸性，但目前的光催化剂仍局限于弱酸性或中性介质（pH≥4）。在此，一种共轭微孔聚合物（CMP），即pTTT-Ben，被用于在强酸性条件（pH = 1）下可见光驱动的U(VI)光催化还原。实现了高铀去除容量（4710 mg/g）。通过X射线光电子能谱（XPS）和扩展X射线吸收精细结构（EXAFS）研究了还原铀的结构信息，揭示了无定形U(IV)水合物络合物，以及U(IV)与pTTT-Ben上氮原子之间的额外相互作用。此外，pTTT-Ben在自然阳光照射下也表现出优异的光催化U(VI)还原性能。
