Biosynthesis of silver nanoparticles using chitosan immobilized Bacillus cereus: Nanocatalytic studies

Gupta V. K., Atar N., Yola M. L., DARCAN C., Idil Ö., Üstündaǧ Z., ...More

Journal of Molecular Liquids, vol.188, pp.81-88, 2013 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 188
  • Publication Date: 2013
  • Doi Number: 10.1016/j.molliq.2013.09.021
  • Journal Name: Journal of Molecular Liquids
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.81-88
  • Keywords: Bionanocatalyst, Biosynthesis, Kinetics, Nanocatalysis, Silver nanoparticle
  • Bilecik Şeyh Edebali University Affiliated: Yes

Abstract

In this paper, the biosynthesis study of silver nanoparticles (AgNPs) using chitosan immobilized on the Bacillus cereus (Bc-C) was performed via bioreduction without any reducing agent. Transmission electron microscopy (TEM) showed that the AgNPs were formed as uniformly sized and shaped in the range of 10-30 nm. Scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction patterns (XRD) confirmed the formation of the Bc-C-Ag. XRD diffraction patterns revealed that the Ag+ on the Bc-C was reduced to Ag (0). This situation shows successful AgNPs synthesis using Bc-C. In the bioreduction studies, the effects of operating variables such as initial metal concentration, pH and contact time were also investigated. The AgNPs formed on Bc-C (Bc-C-Ag) were used as a bionanocatalyst for the reduction of 4-nitrophenol (4-NP). The kinetic models and the thermodynamic parameters were investigated to reveal the reduction mechanism. © 2013 Elsevier B.V.