This study presented the efficient removal of tartrazine, a typical biorefractory dye, in a heterogeneous photochemical Fenton-like system adopting Fe⁰ and oxalate (Ox) (UV/Fe⁰/Ox). Only 47.4% tartrazine could be removed within 60 min with a UV/Fe⁰ system. The addition of Ox could significantly enhance the removal of tartrazine to 72.4% within only 20 min with the UV/Fe⁰/Ox system. The effects of various factors, such as the Fe⁰ dose (0–0.8 g/L), Ox dose (0–2 mM), initial pH (2–6), and initial tartrazine concentration (2–30 mg/L), on the removal of tartrazine were examined. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Mossbauer spectroscopy were conducted to explore the mechanism by which oxalate enhances the performance of the UV/Fe⁰ system. Ox could inhibit the formation of iron (hydro)xides on the Fe⁰ surface, thus guaranteeing the reactivity of Fe⁰ during the reaction. Compared with Fe₂O₃, FeS, and Fe₃O₄, Fe⁰ was a good heterogeneous iron catalyst for the photolysis of tartrazine with the Ox system. Compared with H₃PO₄, nitrilotriacetic acid, and ethylenediaminetetraacetic acid, Ox was also a good photolysis chelating agent. The UV/Fe⁰/Ox system could also maintain fast tartrazine removal after five consecutive runs without the addition of Fe⁰, indicating the good stability of Fe⁰.

这项研究提出了在采用Fe ⁰和草酸盐（Ox）（UV / Fe ⁰ / Ox）的异质光化学Fenton样系统中有效去除典型的生物难降解染料酒石黄的方法。使用UV / Fe ⁰系统在60分钟内只能除去47.4％的酒石黄。使用UV / Fe ⁰ / Ox系统，仅在20分钟内添加Ox即可显着提高酒石黄的去除率，达到72.4％。各种因素的影响，例如Fe ⁰检查了去除酒石azine后的剂量（0–0.8 g / L），牛的剂量（0–2 mM），初始pH（2–6）和初始酒石azine浓度（2–30 mg / L）。进行了扫描电子显微镜（SEM），傅立叶变换红外（FTIR）光谱和Mossbauer光谱，以探索草酸盐增强UV / Fe ⁰系统性能的机理。氧可抑制Fe ⁰表面上铁（氢）氧化物的形成，从而保证反应过程中Fe ⁰的反应性。与Fe ₂ O ₃，FeS和Fe ₃ O _4相比，Fe ⁰是一种很好的非均质铁催化剂，适用于Ox系统对酒石黄的光解。与H ₃ PO ₄，次氮基三乙酸和乙二胺四乙酸相比，Ox也是良好的光解螯合剂。紫外/铁⁰ / OX系统也能保持连续5个运行快速去除柠檬黄不添加铁⁰，表明铁的良好稳定性⁰。