Built-In Electric Field Augments Hypersalinity Resistance of Heterostructured Metal Oxides for Efficient Fenton-like Catalysis

作者：Cheng Chen, Yi Wang, Yunjie Wang, Zhou Jun-hua, Yuqing Li, Pei Kang Shen, Zhiyan Guo, Wen‐Wei Li · 发表于：ACS Nano · 年份：2025 · DOI：10.1021/acsnano.5c08552 · 被引用次数：15 · 研究领域：Advanced oxidation water treatment、Advanced Photocatalysis Techniques、Solar-Powered Water Purification Methods

Fenton-like oxidation processes for saline wastewater treatment are plagued by high energy/chemical consumption, mainly due to severe interferences by the high-concentration inorganic salt. Such salt inhibition can be partially alleviated by shifting to nonradical catalytic processes, but the surface-accumulated salt ions in heterogeneous catalytic systems still cause electrostatic and steric hindrance to restrict the interfacial reactant transfer. Herein, we fabricated a heterostructured CuO/ZnFe 2 O 4 catalyst that provides a built-in electric field (BIEF) to strengthen the reactant–catalyst interaction and weaken the salt interferences. Specifically, the electron-rich CuO component favors electrostatic repelling of chlorine ions (Cl – ), while electron-deficient ZnFe 2 O 4 provides a compressed electrical double layer to strengthen peroxydisulfate adsorption and pollutant diffusion. Consequently, CuO/ZnFe 2 O 4 exhibited superior hypersalinity resistance in Fenton-like catalysis, maintaining almost unchanged decontamination activity in a 500 mM Cl – solution. It also demonstrated high stability and robustness for the treatment of real hypersaline industrial wastewater, achieving over 80% tetracycline removal during a 15-h continuous operation in a fixed-bed reactor. Our work presents insights into BIEF-driven salt resistance via heterostructure design and offers low-carbon advanced oxidation technologies for hypersaline wastewater treatment.