Articles written in Journal of Chemical Sciences

    • Synergistic degradation of tetracycline by BiOBr microspheres combined with peroxydisulfate under visible LED light irradiation


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      A solvothermal method was employed to prepare BiOBr microspheres, which firstly combined with peroxydisulfate (PDS, S2O82-) to synergistically remove tetracycline (TC) from water under visibleLED (Vis-LED) light illumination. About 80.3% of TC (20 mg.L-1) was degraded by BiOBr/PDS/Vis-LEDsystem within 90 min, whereas 28.0%, 28.8% and 65.1% of TC was removed by PDS/Vis-LED, BiOBr/PDSand BiOBr/Vis-LED system, respectively. The degradation of TC in BiOBr/PDS/Vis-LED system obeyed thepseudo-second-order kinetic with a reaction rate constant at 3.6 × 10-3 L.mg-1.min-1. The influence ofsome key parameters (PDS dose, initial solution pH, reaction temperature and inorganic anions) on TCremoval in BiOBr/PDS/Vis-LED system was studied. PDS was activated by photo-induced e- to produceSO4.- , and PDS also assisted O2 and e- to generate O2.-. The trapping experiments and ESR analysisindicated that SO4.-, .OH, h+ and O22.- contributed to TC degradation. According to the detected intermediates,the possible degradation pathways of TC were established. Furthermore, the catalytic performance ofBiOBr/PDS/Vis-LED system for TC degradation in the actual water matrix was studied.

      The visible LED (Vis-LED) light-driven photocatalytic performance of BiOBr microspheres for tetracycline (TC) degradation can be enhanced in the presence of peroxydisulfate (PDS) because adding PDS into BiOBr/Vis-LED system inhibits the recombination of photo-induced electrons and holes, with SO4·− generated at the same time. The degradation of TC in BiOBr/PDS/Vis-LED system obeyed the pseudo-second-order kinetic, and SO4·−, ·OH, h+ and O2·− all contributed to TC degradation. The possible degradation pathways of TC were proposed and the catalytic performance of BiOBr/PDS/Vis-LED system for TC removal in actual water matrix was also investigated.

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