Saravanan Chinnashanmugam, Rajesh Rajendiran, Kaviarasan Thanamegam, Muthukumar Krishnan, Kavitake Digambar, Shetty Prathapkumar Halady
Department of Food Science and Technology, Pondicherry University, Pondicherry 605014, India.
Department of Chemistry, Pondicherry University, Pondicherry 605014, India.
Biotechnol Rep (Amst). 2017 Jun 13;15:33-40. doi: 10.1016/j.btre.2017.02.006. eCollection 2017 Sep.
In this study, the synthesis and characterization of exopolysaccharide-stabilized sliver nanoparticles (AgNPs) was carried out for the degradation of industrial textile dyes. Characterization of AgNPs was done using surface plasmon spectra using UV-Vis spectroscopy, X-ray diffraction (XRD) and Raman spectroscopy. The morphological nature of AgNPs was determined through transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM), which indicated that the AgNPs were spherical in shape, with an average size of 35 nm. The thermal behaviour of AgNPs revealed that it is stable up to 437.1 °C and the required energy is 808.2J/g in TGA-DTA analysis. Ability of EPS stabilized AgNPs for degradation of azo dyes such as Methyl orange (MO) and Congo red (CR) showed that EPS stabilized AgNPs were found to be efficient in facilitating the degradation process of industrial textile dyes. The electron transfer takes place from reducing agent to dye molecule via nanoparticles, resulting in the destruction of the dye chromophore structure. This makes EPS-AgNPs a suitable, cheap and environment friendly candidate for biodegradation of harmful textile dyes.
在本研究中，为了降解工业纺织染料，进行了胞外多糖稳定的银纳米颗粒（AgNPs）的合成与表征。使用紫外可见光谱、X射线衍射（XRD）和拉曼光谱通过表面等离子体光谱对AgNPs进行表征。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）和原子力显微镜（AFM）确定了AgNPs的形态性质，结果表明AgNPs呈球形，平均尺寸为35nm。AgNPs的热行为表明，在热重分析-差示热分析（TGA-DTA）中，它在高达437.1°C时是稳定的，所需能量为808.2J/g。胞外多糖稳定的AgNPs降解偶氮染料如甲基橙（MO）和刚果红（CR）的能力表明，发现胞外多糖稳定的AgNPs在促进工业纺织染料的降解过程中是有效的。电子通过纳米颗粒从还原剂转移到染料分子，导致染料发色团结构的破坏。这使得胞外多糖-银纳米颗粒成为有害纺织染料生物降解的合适、廉价且环境友好的候选物。
