Valorizing Tea Waste: Green Synthesis of Iron Nanoparticles for Efficient Dye Removal from Water

IF 6 2区医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Antioxidants Pub Date : 2024-08-30 DOI:10.3390/antiox13091059

Cristina Rodríguez-Rasero, María F. Alexandre-Franco, Carmen Fernández-González, Vicente Montes-Jiménez, Eduardo M. Cuerda-Correa

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Abstract

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 N2 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 H2O2 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.

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茶叶废弃物的价值：用于高效去除水中染料的铁纳米颗粒的绿色合成

本研究通过回流萃取提取茶多酚，然后利用茶多酚合成零价铁纳米颗粒（nZVI），从而探索茶叶废弃物的价值化。原位生成的纳米颗粒与固定量的过氧化氢结合后，可通过异相催化芬顿过程去除各种染料（亚甲基蓝、甲基橙和橙 G）。通过在 77 K 下对 N2 的气体吸附、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、傅立叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD) 以及热分析（包括热重分析 (TG) 和温度编程还原 (TPR)）对铁纳米粒子进行了全面表征。实验采用统计设计和响应面方法分析了多酚、Fe(III) 和 H2O2 浓度对染料去除效率的影响。结果表明，优化操作条件可使染料去除率达到 100%。这项研究强调了通过生态友好型方法合成的 nZVI 作为涉及多种模型染料的水净化解决方案的潜力，从而为可持续废物管理和环境保护做出了贡献。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Antioxidants Biochemistry, Genetics and Molecular Biology-Physiology

CiteScore

10.60

自引率

11.40%

发文量

2123

审稿时长

16.3 days

期刊介绍： Antioxidants (ISSN 2076-3921), provides an advanced forum for studies related to the science and technology of antioxidants. It publishes research papers, reviews and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.