Moon Sun A, Salunke Bipinchandra K, Alkotaini Bassam, Sathiyamoorthi Ezhaveni, Kim Beom Soo
Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
IET Nanobiotechnol. 2015 Aug;9(4):220-5. doi: 10.1049/iet-nbt.2014.0051.
Manganese dioxide (MnO₂) nanoparticles were synthesised by the reduction of potassium permanganate (KMnO₄) using Kalopanax pictus leaf extract at room temperature. A transparent dark-brown colour appeared after the addition of K. pictus leaf extract to the solution of permanganate. The time course of the reduction of KMnO₄and synthesis of MnO₂ nanoparticles was monitored by means of UV-Vis spectra. The reduction of KMnO₄occurred after addition of plant extract with disappearance of KMnO₄specific peaks and emergence of peak specific for MnO₂nanoparticles. MnO₂nanoparticles showed absorption maxima at 404 nm. The electron dispersive X-ray spectroscopy analyses confirmed the presence of Mn and O in the sample. X-ray photoelectron spectroscopy revealed characteristic binding energies for MnO₂nanoparticles. Transmission electron microscopy micrographs revealed presence of uniformly dispersed spherical shaped particles with average size of 19.2 nm. The selected area electron diffraction patterns revealed the crystalline nature of MnO₂nanoparticles. Fourier transform-infrared spectroscopy spectra of pure MnO₂show the occurrence of O-Mn-O vibrational mode at around 518 cm⁻¹. The phyto-synthesised MnO₂nanoparticles showed degradation ability of dyes (congo red and safranin O) similar to chemically synthesised MnO₂nanoparticles. This study shows simple and eco-friendly synthesis of MnO₂nanoparticles by plant extract and their utilisation for dye degradation for the first time.
在室温下，使用刺楸叶提取物还原高锰酸钾（KMnO₄）合成了二氧化锰（MnO₂）纳米颗粒。向高锰酸盐溶液中加入刺楸叶提取物后，溶液呈现出透明的深棕色。通过紫外可见光谱监测KMnO₄的还原过程和MnO₂纳米颗粒的合成过程。加入植物提取物后，KMnO₄发生还原，KMnO₄的特征峰消失，出现了MnO₂纳米颗粒特有的峰。MnO₂纳米颗粒在404 nm处有最大吸收峰。电子色散X射线光谱分析证实样品中存在Mn和O。X射线光电子能谱揭示了MnO₂纳米颗粒的特征结合能。透射电子显微镜照片显示存在均匀分散的球形颗粒，平均尺寸为19.2 nm。选区电子衍射图谱揭示了MnO₂纳米颗粒的晶体性质。纯MnO₂的傅里叶变换红外光谱显示在约518 cm⁻¹处出现O-Mn-O振动模式。植物合成的MnO₂纳米颗粒表现出与化学合成的MnO₂纳米颗粒相似的染料（刚果红和番红O）降解能力。本研究首次展示了利用植物提取物简单且环保地合成MnO₂纳米颗粒及其用于染料降解的应用。
