1. Northwest Key Laboratory of Resources, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Shaanxi Provincial Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3. Shaanxi Collaborative Innovation Center for Water Pollution Control and Water Quality Safety, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：The active manganese oxide (MnOx) filter media was found to exhibit efficient catalytic oxidation performance in removing ammonia nitrogen and manganese pollutants from water, but it was lacking in stability for the removal of bisphenol A (BPA), and the interaction mechanism with other inorganic pollutants remained unclear. In this study, sodium persulfate (NPS) was used to enhance the effect of the activated filter material (FM) on the removal of BPA. The experiment revealed that the removal rate could be increased to over 80% with the addition of just 0.1mmol/L of NPS, and the removal efficiency was further improved as the NPS concentration increased, ultimately reaching 100%. The addition of NH4+ and Mn2+ was found to increase the production of reactive species by promoting electron transfer and providing electrons, respectively, thus enhancing the removal efficiency of BPA. The cycling experiment demonstrated that, while the FM exhibited good stability, the removal rate dropped to 48% after 11consecutive uses; however, this rate could be maintained above 65% with the addition of NPS. Free radical quenching and EPR experiments, along with X-ray photoelectron spectroscopy (XPS) analysis, confirmed that the primary reactive species in the filter material/NPS system were SO4·−, ·OH, and 1O2, with Mn(III) playing a crucial role in the catalytic oxidation process for removing BPA. The addition of NPS facilitated the formation of Mn(III), thereby promoting the removal of BPA.
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