Interaction of colloidal silver nanoparticles (SNPs) with exopolysaccharides (EPS) and its adsorption isotherms and kinetics

被引：22

作者：

Khan, S. Sudheer ^{[1
]}

Mukherjee, Amitava ^{[1
]}

Chandrasekaran, Natarajan ^{[1
]}

机构：

[1] VIT Univ, Ctr Nanobiotechnol, Sch Biosci & Technol, Vellore 632014, Tamil Nadu, India

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2011年 / 381卷 / 1-3期

关键词：

Silver nanoparticles; Exopolysaccharides; Zeta potential; Adsorption isotherm; Adsorption kinetics; STABILIZED SILVER; NANOSTRUCTURES; CHROMATOGRAPHY; SORPTION;

D O I：

10.1016/j.colsurfa.2011.03.032

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption of exopolysaccharides (EPS) on silver nanoparticles (SNPs) was influenced by pH, salt concentration, and zeta potential. In this paper, SNPs were stabilized using exopolysaccharides (EPS) produced by Aeromonas punctata as the capping agent. The effects of EPS concentration on the adsorption was studied by UV-visible absorption spectra. During interaction, a decrease in absorbance at plasmon peak of SNPs (425 nm) was observed till 50 mg/L of EPS, beyond that a blue shift towards 411 nm was observed. The capping of SNPs by EPS was confirmed by Fourier Transform Infrared Spectroscopy. The adsorption of EPS on nanoparticles was found to be strongly dependent on zeta potential. The equilibrium adsorption data fitted well by Langmuir isotherm compared to Freundlich curve. The kinetics of adsorption was fitted by pseudo-second-order. Desorption of EPS from SNPs was observed at alkaline pH 12. The stabilized silver nanoparticles could be more amenable towards applications in biotechnology and bioengineering. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：99 / 105

页数：7

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