Lin Leiming, Li Zheng, Ren Jun, Meng Ying, Luan Fubo
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Proc Natl Acad Sci U S A. 2025 Mar 25;122(12):e2501354122. doi: 10.1073/pnas.2501354122. Epub 2025 Mar 20.
The co-occurrence of arsenic and uranium in groundwater has been found in many countries, posing a significant challenge to human health. Here, we have demonstrated the efficient simultaneous removal of arsenic and uranyl-carbonate complexes from groundwater using {001}-TiO. Surprisingly, the presence of U(VI) greatly enhanced the adsorption of As(V) on {001}-TiO, while As(V) had a negligible impact on U(VI) adsorption. Through in situ ATR-FTIR spectroscopy, we uncovered a mechanism involving the formation of a ternary surface complex [Ti-U(VI)-As(V)] on the surface of {001}-TiO. This ternary surface complex formed through the substitution of CO from uranyl coordination sites. Furthermore, the adsorbed As(V) and U(VI) can be easily recovered using a sodium hydroxide solution, and {001}-TiO can be used repeatedly. Our findings offer a promising solution for the simultaneous removal of As(V) and U(VI) from groundwater and provide valuable insights into the mechanisms involved in their removal.
许多国家的地下水中都发现了砷和铀的共存，这对人类健康构成了重大挑战。在此，我们展示了使用{001}-TiO从地下水中高效同时去除砷和碳酸铀酰络合物的方法。令人惊讶的是，U(VI)的存在极大地增强了As(V)在{001}-TiO上的吸附，而As(V)对U(VI)吸附的影响可忽略不计。通过原位ATR-FTIR光谱，我们揭示了一种在{001}-TiO表面形成三元表面络合物[Ti-U(VI)-As(V)]的机制。这种三元表面络合物是通过从铀酰配位位点取代CO形成的。此外，使用氢氧化钠溶液可以轻松回收吸附的As(V)和U(VI)，并且{001}-TiO可以重复使用。我们的研究结果为从地下水中同时去除As(V)和U(VI)提供了一个有前景的解决方案，并为其去除机制提供了有价值的见解。
