| 石榴皮提取物绿色合成纳米零价铁及合成机理探究 |
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| 引用本文： | 杨莉,张黎,张珊,李洁,王通,王柯,沈韵.石榴皮提取物绿色合成纳米零价铁及合成机理探究[J].华南师范大学学报(自然科学版),2022,54(4):56-64. |
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| 作者姓名： | 杨莉 张黎 张珊 李洁 王通 王柯 沈韵 |
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| 作者单位： | 长安大学水利与环境学院/旱区地下水文与生态效应教育部重点实验室，西安 710054 |
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| 基金项目： | 陕西省自然科学基金项目2018JM2030 |
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| 摘 要： | 以石榴皮提取物为还原剂和稳定剂，绿色合成了纳米零价铁(GS-nZVI)。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)、热重分析(TGA)等表征手段对GS-nZVI的物理化学性质进行了表征，结合粒径、Zeta电位测试结果和化学平衡基本原理，讨论了合成条件(如反应时间、铁盐浓度、提取物多酚的质量浓度)对GS-nZVI粒径和产率的影响，并提出了可能的合成机理。结果表明:石榴皮提取物合成的GS-nZVI呈无定型结构，提取物中多酚类物质不仅能把亚铁盐(Fe2+)还原为零价铁(Fe0)，而且可作为稳定剂包覆在GS-nZVI表面，提高纳米粒子分散性。反应时间为120 min，Fe2+浓度为0.05 mol/L，多酚的质量浓度为15 mg/mL时合成的GS-nZVI粒径、产率综合结果最优，其产率为24.45%、粒径分布主要集中在213 nm。
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| 关 键 词： | 纳米零价铁 绿色合成 粒径 产率 |
| 收稿时间： | 2022-03-29 |
The Green Synthesis of nZVI Using Pomegranate Peel Extract and Its Reaction Mechanism |
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| Affiliation: | MOE Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas/School of Water and Environment, Chang'an University, Xi'an 710054, China |
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| Abstract: | Nano zero valent iron nanoparticles (GS-nZVI) were green-synthesized with pomegranate peel extract as the reducing agent and stabilizer. The physical and chemical properties of GS-nZVI product were characterized with scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscop (FTIR), X-ray photoelectron spectroscop (XPS) and Thermo-Gravimetric Analysis (TGA). The particle size and surface Zeta potential of the products were measured with the laser-scattering Zetasizer instrument. Based on the basic principle of chemical equilibrium, the effects of synthesis conditions such as reaction time, iron salt concentration and polyphenol concentration on the particle size and yield were discussed and the possible mechanism was proposed. The results showed that GS-nZVI synthesized from pomegranate peel extract had an amorphous structure and polyphenols in the extract not only reduced the ferritic salt (Fe2+) to Fe0 but also coated on the surface of nanoparticles as a stabilizer to improve the dispersion of the samples. The results proved that 120 min reaction time, 0.05 mol/L Fe2+ and 15 mg/mL polyphenol was the best preparation condition of GS-nZVI with the highest yield and the smallest particle size, and the mean particle size was 213 nm. |
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