Effective catalytic methods and catalysts for the simultaneous removal of coexisting organic pollutants and heavy metal ions are crucial for sustainable and environmentally friendly water purification. Herein, flower-like S-scheme In 2 Se 3 @Ag 3 PO 4 heterojunctions were synthesized by a two-step hydrothermal method for simultaneous removal of uranium (VI) (U(VI)) and organic pollutants using piezo-photocatalysis. Characterization and theoretical calculations confirmed the formation of the heterojunction, highlighting the significance of In O and Se P bonds in the S-scheme for enhancing photocatalytic reactions by improving charge carrier separation and migration. Additionally, the piezoelectric polarization electric field can also improve photocatalytic performance. The optimized In 2 Se 3 @Ag 3 PO 4 –3 catalyst demonstrated superior piezo-photocatalytic performance in synergistically removing U(VI) and degrading organics, such as tetracycline (TC), bisphenol A (BPA), carbamazepine (CBZ), levofloxacin (LVX), and norfloxacin (NOR). Particularly, in the presence of TC, the catalyst achieved 98.7 % U(VI) removal, and 94.1 % TC degradation within 30 min. This study introduces a promising strategy and a novel heterojunction catalyst with dual functional properties for the simultaneous treatment of wastewater containing organic pollutants and U(VI).
Xinyi Zhang,Yinxiang Chen,Rongshuo Guo,Zhijun Zhang,Zhe Sun,Ye Zhang,Feng Yan
Ionic liquids (ILs) have emerged as new persistent pollutants in aquatic environments due to their notable ecotoxicity. Herein, In 2 Se 3 @Ag 3 PO 4 S-scheme piezo-photocatalyst with interfacial In-O and Se-P covalent bonds is prepared for efficient degradation of 1-butyl-2,3-dimethylimidazole bromide ([BMMIm]Br). The experimental results demonstrate that 98.3 % of [BMMIm]Br is degraded under piezo-photocatalysis. Notably, [BMMIm]Br functions as a hole sacrificial agent, leading to a simultaneous H 2 production rate of 582.7 μmol g −1 h −1 and a co-removal efficiency of 97.2 % for radioactive heavy metal ions of U(VI), achieving the "three birds with one stone" effect. Density functional theory (DFT) calculations indicate that the S-scheme structure, combined with the In-O and Se-P covalent bonds and the piezoelectric effect, effectively promotes the separation of electron/hole pairs while inhibiting carrier recombination dynamics, thereby enhancing piezo-photocatalytic performance. Moreover, systemic toxicity evaluations, including assessments of calculated toxicity, zebrafish growth, and bean sprout development, were conducted to verify the reduced toxicity of the degraded intermediates, highlighting the potential practical applications of this approach.
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