Chen Lili, Wakeel Muhammad, Haq Tanveer Ul, Chen Changlun, Ren Xuemei
CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China.
Department of Soil and Environmental Science, MNS-Agriculture University Multan, Pakistan.
J Hazard Mater. 2022 May 15;430:128377. doi: 10.1016/j.jhazmat.2022.128377. Epub 2022 Jan 29.
With the development of MXene as the efficient adsorbent for U(VI), the tendency of MXene coming into contact with U(VI) in wastewaters increases. Motivated by UV light irradiation applied in wastewater treatments, the UV light induced photochemical co-transformation of TiCT MXene and U(VI) is studied. To clarify the role of U(VI) induced TiCT aggregation in phototransformation of TiCT, the aggregation kinetics of TiCT in the presence of various valent radioactive ions are investigated, obtaining the critical coagulation concentrations (CCC) of TiCT for Cs, Sr, UO, Eu, and Th. Besides, the colloidal stability of UV-induced TiCT as a function of standing time is discussed. The results show that the aggregation behavior of TiCT induced by radioactive ions follows the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and the Schulze-Hardy rule. The UV irradiation will change the physicochemical properties and colloidal stabilities of TiCT. Furthermore, the degradation of TiCT can be accelerated by UV irradiation and further promoted by the presence of U(VI). The removal of U(VI) is highest in the case of TiCT combined with UV irradiation via adsorption and reduction. This study provides an example demonstrating that the simultaneous transformation of TiCT (adsorbent) and U(VI) (adsorbate) to mild toxic components.
随着作为高效吸附剂用于吸附U(VI)的MXene的发展，MXene在废水中与U(VI)接触的趋势增加。受废水处理中应用的紫外光照射的启发，研究了紫外光诱导的TiCT MXene与U(VI)的光化学共转化。为了阐明U(VI)诱导的TiCT聚集在TiCT光转化中的作用，研究了在各种价态放射性离子存在下TiCT的聚集动力学，得到了TiCT对Cs、Sr、UO、Eu和Th的临界凝聚浓度(CCC)。此外，还讨论了紫外诱导的TiCT的胶体稳定性随静置时间的变化。结果表明，放射性离子诱导的TiCT聚集行为遵循经典的Derjaguin-Landau-Verwey-Overbeek(DLVO)理论和舒尔茨-哈迪规则。紫外照射会改变TiCT的物理化学性质和胶体稳定性。此外，紫外照射可加速TiCT的降解，U(VI)的存在可进一步促进其降解。在TiCT与紫外照射结合通过吸附和还原的情况下，U(VI)的去除率最高。本研究提供了一个实例，证明了TiCT(吸附剂)和U(VI)(吸附质)同时转化为轻度有毒成分。
