Abstract
The heterogeneous UV/Fenton degradation of tetrabromobisphenol A (TBBPA) catalyzed by nanocrystalline Fe3O4 and Fe2.04Cr0.96O4 was investigated, with focus on the influence of UV light and initial pH, degradation pathways and effect of Cr substation. The catalysts were prepared by a precipitation-oxidation method and characterized by chemical analysis, XRD, XAFS, TG-DSC, BET surface area and magnetometer. At pH 6.7 and under UV irradiation, almost complete degradation of TBBPA by Fe2.04Cr0.96O4 was accomplished within 240 min, and the leaching Fe ions were negligible. The substitution of chromium greatly increased the BET specific surface area and surface hydroxyl amount, which improved the heterogeneous UV/Fenton catalytic activity of magnetite. Moreover, Cr3+ on the octahedral sites enhanced the electron transfer process in the magnetite structure to accelerate the *OH generation. The produced *OH radicals preferentially attacked the C-Br bonds of TBBPA and then β-cleavaged the C-C bonds between benzene rings and isopropyl groups. The above results are of great significance for well understanding the effect of transition metal substitution on the UV/Fenton catalytic activity of magnetite and prospecting the application of magnetite minerals in environmental purification.
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