CQUM, Centre of Chemistry, Chemistry Department, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
CQUM, Centre of Chemistry, Chemistry Department, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal; INL - Advanced (magnetic) Theranostic Nanostructures Lab, Nanomedicine Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715- 330, Braga, Portugal.
Chemosphere. 2023 Oct;339:139634. doi: 10.1016/j.chemosphere.2023.139634. Epub 2023 Jul 27.
Optimization of iron zeolitic imidazole framework-8 (FeZIF-8) nanoparticles, as heterogeneous catalysts, were synthesized and evaluated by the Fenton-like reaction for to degrade tartrazine (Tar) in aqueous environment. To achieve this, ZIF-8 nanoparticles were modified with different iron species (Fe or FeO), and subsequently assessed through the Fenton-like oxidation. The effect of different parameters such as the concentration of hydrogen peroxide, the mass of catalyst and the contact time of reaction on the degradation of Tar by Fenton-like oxidation was studied by using the Box-Behnken design (BBD). The BBD model indicated that the optimum catalytic conditions for Fenton-like reaction with an initial pollutant concentration of 30 ppm at pH 3.0 were T = 40 °C and 12 mM of HO, 2 g/L of catalyst and 4 h of reaction. The maximum Tar conversion value achieved with the best catalyst, FeZIF-8, was 66.5% with high mineralization (in terms of decrease of total organic carbon - TOC), 44.2%. To assess phytotoxicity, the germination success of corn kernels was used as an indicator in the laboratory. The results show that the catalytic oxidation by Fenton-like reaction using heterogeneous iron ZIF-8 catalysts is a viable alternative for treating contaminated effluents with organic pollutants and highlighted the importance of the validation of the optimized experimental conditions by mathematical models.
优化铁沸石咪唑骨架-8（FeZIF-8）纳米粒子作为非均相催化剂，通过类 Fenton 反应在水相环境中降解食用黄色 5（Tar）。为了实现这一目标，用不同的铁物种（Fe 或 FeO）修饰 ZIF-8 纳米粒子，然后通过类 Fenton 氧化进行评估。采用 Box-Behnken 设计（BBD）研究不同参数（如过氧化氢浓度、催化剂质量和反应接触时间）对类 Fenton 氧化降解 Tar 的影响。BBD 模型表明，在初始污染物浓度为 30ppm、pH 值为 3.0 的条件下，类 Fenton 反应的最佳催化条件为 T=40°C 和 12mM 的 HO、2g/L 的催化剂和 4h 的反应时间。最佳催化剂 FeZIF-8 的 Tar 转化率最高值为 66.5%，TOC （总有机碳）去除率高，为 44.2%。为了评估植物毒性，采用玉米籽粒发芽成功率作为实验室的指标。结果表明，使用非均相铁 ZIF-8 催化剂的类 Fenton 反应催化氧化是处理有机污染物污染废水的一种可行方法，并强调了通过数学模型验证优化实验条件的重要性。
