Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Poster Wednesday: Nanostructures
O 68.10: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Mechanism of SeOx2- Immobilization by δ-Bi2O3 Microsphere with Surface Oxygen Vacancies — •Long Liu1, Huaping Zhao1, Chenglin Zhang1, Yang Xu1, Dongjiang Yang2, and Yong Lei1 — 1Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany — 2School of Environmental Science and Engineering, 266071 Qingdao, China
Removal of the toxic selenium compounds, e.g., selenite (SeO32-) and selenate (SeO42-), from contaminated water is imperative for environmental protection and drinking water safety. But conventional ion exchange and physical adsorption approaches are insufficient to achieve the required drinking water standard of selenium compounds with a concentration below 10 μg/L. Here we report that the preparation of microsphere-like δ-Bi2O3 with surface oxygen vacancies for efficiently capturing toxic SeOx2- (SeO32- and SeO42-) anions from aqueous solutions with superior capacity and fast uptake rate. The SeOx2- immobilization mechanism is attributed to the existence of surface oxygen vacancies, and implies the utilization of surface defects as highly efficient and adsorptive sites to capture specific toxic species.