Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China; College of Food and Biological Engineering, Jimei University, Xiamen, 361005, China.
Chemosphere. 2020 Dec;261:127618. doi: 10.1016/j.chemosphere.2020.127618. Epub 2020 Jul 13.
Iron nanoparticles (Fe NPs) were synthesized herein through a simple and eco-friendly method using FeCl and aqueous plant extract (dimocarpus longan, DL). Compared with Fe NPs prepared via traditional chemical methods, this biogenetic DL-Fe NPs demonstrates higher catalytic activity in Fenton-like reaction to degrade methyl orange (MO) in a wide pH range. It's worth noting that the DL-Fe NPs manifest a superior stability even after storage for at least 28 days. Systematic characterizations indicate that the active biomolecules from plant extract significantly contribute to the superior performance of DL-Fe NPs, by facilitating the dye molecules to be adsorbed on the surfaces of DL-Fe NPs, and providing a stable acid environment for the Fenton-like catalytic reaction. The kinetics study demonstrates this removal process conforms to the pseudo first-order model with the reaction activation energy of 41.6 kJ/mol. Moreover, various typical dyes including congo red, malachite green, methylene blue, eosin-Y and rhodamine B can be dramatically degraded by this DL-Fe NPs with a satisfactory removal efficiency.
铁纳米粒子（Fe NPs）是通过一种简单且环保的方法合成的，该方法使用 FeCl 和水植物提取物（龙眼，DL）。与通过传统化学方法制备的 Fe NPs 相比，这种生物合成的 DL-Fe NPs 在芬顿样反应中表现出更高的催化活性，可在很宽的 pH 范围内降解甲基橙（MO）。值得注意的是，即使在储存至少 28 天后，DL-Fe NPs 也表现出优异的稳定性。系统的特性表明，来自植物提取物的活性生物分子对 DL-Fe NPs 的优异性能有很大的贡献，通过促进染料分子被吸附在 DL-Fe NPs 的表面上，并为芬顿样催化反应提供稳定的酸性环境。动力学研究表明，该去除过程符合准一级模型，反应活化能为 41.6 kJ/mol。此外，各种典型的染料，包括刚果红、孔雀绿、亚甲基蓝、曙红-Y 和罗丹明 B，都可以通过这种 DL-Fe NPs 显著降解，去除效率令人满意。
