硫纳米颗粒的绿色合成及其对水中六价铬的催化解毒作用评估
Green synthesis of sulfur nanoparticles and evaluation of their catalytic detoxification of hexavalent chromium in water.
作者信息
Tripathi R M, Rao R Pragadeeshwara, Tsuzuki Takuya
机构信息
Amity Institute of Nanotechnology, Amity University Noida Uttar Pradesh 201313 India.
Research School of Engineering, College of Engineering and Computer Science, Australian National University Canberra ACT 2601 Australia
出版信息
RSC Adv. 2018 Oct 25;8(63):36345-36352. doi: 10.1039/c8ra07845a. eCollection 2018 Oct 22.
Chromium contamination in the aquatic environment is an urgent and serious issue due to its mutagenic and carcinogenic effects against living organisms. The present study demonstrates the capability of biogenic sulfur nanoparticles (SNPs) for the reduction of hexavalent chromium into a less toxic state. A green approach was adapted for the synthesis of SNPs using leaf extract which acts as a reducing and capping agent. The biosynthesized SNPs were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray spectroscopy (EDX). TEM micrographs revealed that the zero-valent sulfur nanoparticles were in the range of 2-15 nm and the average size of 5.1 nm. The conversion rate of Cr(vi) into Cr(iii) in the presence of SNPs was 88.7% in 80 min. The optimum concentration ratio between SNPs and formic acid was 10 ppm : 480 mM.
由于铬对生物具有致突变和致癌作用，水生环境中的铬污染是一个紧迫而严重的问题。本研究证明了生物源硫纳米颗粒（SNPs）将六价铬还原为毒性较低状态的能力。采用绿色方法，使用作为还原剂和封端剂的叶提取物合成SNPs。通过紫外可见光谱、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、原子力显微镜（AFM）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HR-TEM）和能量色散X射线光谱（EDX）对生物合成的SNPs进行了表征。透射电子显微镜图像显示，零价硫纳米颗粒的尺寸在2-15纳米范围内，平均尺寸为5.1纳米。在SNPs存在下，80分钟内Cr(vi)转化为Cr(iii)的转化率为88.7%。SNPs与甲酸的最佳浓度比为10 ppm : 480 mM。
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