Currently, Fenton-like processes are effective for pollutant degradation but face challenges in high-salinity environments due to radical quenching and limited removal efficiency. To address this, our study introduces Bi12FeO20 sillenite nanosheets with a pronounced internal electric field (IEF) as catalysts, which efficiently activate H2O2 to generate a high concentration of superoxide radicals (•O2–) on the catalyst’s surface, enabling highly efficient ciprofloxacin (CIP) degradation under high-salinity conditions. Experimental results show that the system achieves CIP degradation rates exceeding 98% within 8 min in 0.5 M solutions of NaCl, Na2SO4, KCl, and MgCl2, with no significant inhibition observed as salt concentration increases. In continuous-flow tests, the system operates stably for 100 h, maintaining an average CIP degradation rate of 93.1%. Both experimental and theoretical analyses reveal that the IEF of Bi12FeO20 nanosheets is 2.95 times stronger than that of nanoparticles, resulting in a negative electric effect that reduces chloride-ion adsorption and promotes H2O2 activation, thereby promoting localized •O2– production. This study offers a promising approach for applying Fenton-like technology to pollutant degradation in high-salinity environments.
Qiu et al. (Mon,) studied this question.