Visible light-driven intimately coupled photocatalysis and biodegradation (VDICPB) is an efficient technology for removing recalcitrant contaminants, but the degradation pathway on 17β-estradiol 3-Sulfate (E2-3S) is still not clear. In this study, VDICPB based on N-doped TiO as a photocatalyst was established to investigate the removal and transformation of E2-3S in synthetic wastewater. VDICPB showed a satisfactory removal efficiency of 97.8 ± 0.4 %, which was much higher than that of independent photocatalysis (84.0 ± 2.2 %) or biodegradation system (71.4 ± 1.8 %). Steroid C/D-rings of E2-3S was broken in VDICPB since the transformation process reached terminal central pathway. Primary metabolites did not accumulate in VDICPB, resulting in a low expression of functional genes. E2-3S was mainly removed by cooperative interaction of photocatalysis and co-metabolism of biofilm. Photocatalysis led to deconjugation and microbes acted to mineralization. This study provides technical reference and theoretical support for the removal of new pollutants.

中文翻译：

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可见光驱动的紧密耦合光催化和生物降解系统中结合雌激素的降解


可见光驱动的紧密耦合光催化和生物降解（VDICPB）是一种去除顽固污染物的有效技术，但 17β-雌二醇 3-硫酸酯（E2-3S）的降解途径仍不清楚。本研究建立了基于N掺杂TiO作为光催化剂的VDICPB来研究合成废水中E2-3S的去除和转化。 VDICPB表现出令人满意的去除效率，为97.8±0.4％，远高于独立光催化（84.0±2.2％）或生物降解系统（71.4±1.8％）。由于转化过程到达末端中央通路，E2-3S 的类固醇 C/D 环在 VDICPB 中断裂。初级代谢物在VDICPB中不积累，导致功能基因低表达。 E2-3S主要通过光催化和生物膜共代谢的协同作用被去除。光催化导致解离，微生物作用于矿化。本研究为新型污染物的去除提供技术参考和理论支持。