Rodríguez-Rasero Cristina, Alexandre-Franco María F, Fernández-González Carmen, Montes-Jiménez Vicente, Cuerda-Correa Eduardo M
Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias, Universidad de Extremadura, Avenida de Elvas s/n, 06006 Badajoz, Spain.
Antioxidants (Basel). 2024 Aug 30;13(9):1059. doi: 10.3390/antiox13091059.
This study explores the valorization of tea leaf waste by extracting polyphenols through reflux extraction, subsequently using them to synthesize zero-valent iron nanoparticles (nZVI). The in situ generated nanoparticles, when combined with fixed amounts of hydrogen peroxide, facilitated the removal of various dyes (methylene blue, methyl orange, and orange G) via a hetero-catalytic Fenton process. The iron nanoparticles were thoroughly characterized by gas adsorption of N at 77 K, scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), FT-IR spectroscopy, X-ray diffraction (XRD), and thermal analysis, including thermogravimetric analysis (TG) and temperature-programmed reduction (TPR). A statistical design of experiments and response surface methodology were employed to analyze the influence of polyphenol, Fe(III), and HO concentrations on dye removal efficiency. The results demonstrated that optimizing the operational conditions could achieve 100% dye removal efficiency. This study highlights the potential of nZVI synthesized through eco-friendly methods as a promising solution for water decontamination involving diverse model dyes, thus contributing to sustainable waste management and environmental protection.
本研究探索了茶叶废料的价值利用，通过回流萃取提取多酚，随后用其合成零价铁纳米颗粒（nZVI）。原位生成的纳米颗粒与固定量的过氧化氢结合，通过异相催化芬顿过程促进了各种染料（亚甲基蓝、甲基橙和橙黄G）的去除。通过77K下N的气体吸附、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）以及热分析（包括热重分析（TG）和程序升温还原（TPR））对铁纳米颗粒进行了全面表征。采用实验统计设计和响应面方法分析了多酚、Fe(III)和HO浓度对染料去除效率的影响。结果表明，优化操作条件可实现100%的染料去除效率。本研究突出了通过环保方法合成的nZVI作为涉及多种模型染料的水净化的有前景解决方案的潜力，从而有助于可持续废物管理和环境保护。
