Visible light-induced degradation of indigo carmine over ZnFe2O4/Tannin/ZnO: Role of tannin as a modifier and its degradation mechanism

摘要: Abstract Design and usage of efficient visible light photocatalytic systems for wastewater treatment degradation organic dyes are remarkable interest in the fields environmental protection. In this study, magnetic ZnFe2O4, ZnFe2O4/ZnO, Tannin/ZnFe2O4 Tannin/ZnFe2O4/ZnO nanocomposites with interfacial contact have been synthesized. The efficiencies as-obtained samples analyzed by indigo carmine aqueous solution under UV visible-light. ratios IC 82% 99% over both 90 min, respectively. And after five times recycling, performance presence can even reach nearly 89.79%. results demonstrate that exhibits great efficiency (IC) compared to their constituent photocatalysts easy separation from dye magnet. synergistic interactions between tannin ZnO prolonged lifetime photoexcited carriers leading greater absorption light. This nanocomposite was beneficial separating photogenerated charge facilitating electron transfer. Tannin has a decisive role increasing ZnFe2O4 due abundant units phenolic groups molecules. makes magnetically separable system. work presents new insights molecules function as modifier improve very impactful tannin-modified removing contamination.