Photocatalytic magnetic bimetallic ferrite synergistically activates ammonium persulfate for the efficient degradation of tetrachlorobisphenol A(TCBPA)

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The presence of tetrachlorobisphenol A(TCBPA) in the environment is continually increasing, which has potential negative effects on human health. Therefore, it is important to develop new materials that can degrade these compounds using various modification techniques. Recently, the photocatalytic degradation of organic pollutants using peroxides has been widely used as the focus of several research studies. This study synthesized Zr-doped NiFe2O4 (Zr-NiFe2O4) metal complex materials using a co-precipitation method and applied them to catalyze the degradation of a typical halogenated bisphenol A pollutant using different phase-catalyzed peroxydisulfate (PS) compounds. The results showed that Zr-NiFe2O4 significantly enhances the nitrogen-active adaptive catalytic action between the reactive species and (NH4)2S2O8, exhibiting an excellent catalytic performance (99 %). The degradation rate could reach 90 % after 30 mins with the low concentration of TCBPA (20 mg•L–1). Furthermore, the degradation of TCBPA in the Zr-NiFe2O4/LED/(NH4)2S2O8 system occurred over a wide pH range of 3–11. The results of leaching metals were detected that the concentrations of the leached zirconium, nickel and iron ions declined to 0.018 mg•L−1. In addition, the tri-metal synergistic effect of Zr-NiFe2O4 not only significantly improved the TCBPA removal efficiency, but also enhanced the long-term stability of the composite material. Mechanistic studies revealed that ·OH and SO4·– were involved in the TCBPA degradation process with ·OH being the primary active species, and the possible degradation pathways were deduced using mass spectrometry. The on-line infrared test experiments showed the disappearance of the hydroxyl and double bond within approximately 120 seconds. Moreover, the magnetic properties of Zr-NiFe2O4 met the water recovery requirements, effectively reducing secondary pollution, and aligned with the practical needs for water treatment, providing data for the construction of efficient magnetic catalysts.