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Synthesis and Property Examination of Er2FeSbO7/BiTiSbO6 Heterojunction Composite Catalyst and Light-Catalyzed Retrogradation of Enrofloxacin in Pharmaceutical Waste Water under Visible Light Irradiation

Jingfei Luan,Wenlu Liu,Ye Yao,Bingbing Ma,Bowen Niu,Guangmin Yang,Zhijie Wei

A new photocatalyst, Er2FeSbO7, was prepared by solid phase sintering using the high-temperature synthesis method for the first time in this paper. Er2FeSbO7/BiTiSbO6heterojunction (EBH) catalyst was prepared by the solvent thermal method for the first time. Er2FeSbO7compound crystallized in the pyrochlore-type architecture and cubelike crystal system; the interspace group of Er2FeSbO7wasFd3mand the crystal cellular parameter a of Er2FeSbO7was 10.179902 Å. The band gap (BDG) width of Er2FeSbO7was 1.88 eV. After visible light irradiation of 150 minutes (VLGI-150min) with EBH as a photocatalyst, the removal rate (RR) of enrofloxacin (ENR) concentration was 99.16%, and the total organic carbon (TOC) concentration RR was 94.96%. The power mechanics invariable k toward ENR consistency and visible light irradiation (VLGI) time with EBH as a photocatalyzer attained 0.02296 min−1. The power mechanics invariable k which was involved with TOC attained 0.01535 min−1. The experimental results showed that the photocatalytic degradation (PCD) of ENR within pharmaceutical waste water with EBH as a photocatalyzer under VLGI was in keeping with the single-order reactivity power mechanics. The RR of ENR with EBH as a photocatalyzer was 1.151 times, 1.269 times or 2.524 times that with Er2FeSbO7as a photocatalyst, BiTiSbO6as a photocatalyst, or N-doping TiO2(N-TO) as a photocatalyst after VLGI-150min. The photocatalytic activity, which ranged from high to low among above four photocatalysts, was as follows: EBHP > Er2FeSbO7> BiTiSbO6> N-TO. After VLGI-150min toward three periods of the project with EBH as a photocatalyst, the RR of ENR attained 98.00%, 96.76% and 95.60%. The results showed that the stability of EBH was very high. With appending trapping agent, it could be proved that the oxidative capability for degrading ENR, which ranged from strong to weak among three oxidic radicals, was as follows: superoxide anion > hydroxyl radicals (HRS) > holes. This work provides a scientific basis for the research and oriented leader development of efficient heterojunction catalysts.Keywords:Er2FeSbO7;Er2FeSbO7/BiTiSbO6heterojunction photocatalyst;enrofloxacin;pharmaceutical wastewater;visible light irradiation;photocatalytic activity