Figures of Green synthesis of ZnO nanoparticles by ...

3 downloads 0 Views 508KB Size Report
K. M. Garadkar [email protected]. Nanomaterials Research Laboratory, Department of Chemistry, Shivaji. University, Kolhapur, Maharashtra 416004, ...
Figures of Green synthesis of ZnO nanoparticles by using Calotropis procera leaves for the photodegradation of methyl orange Journal of Materials Science Materials in Electronics · June 2017

DOI: 10.1007/s10854-017-7254-2 V. V. Gawade · N. L. Gavade · H. M. Shinde · S. B. Babar · A. N. Kadam · K. M. Garadkar *Prof. K. M. Garadkar [email protected] Nanomaterials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra 416004, India

Abstract

: A facile, innovative and inexpensive green route has been demonstrated for the formation of ZnO nanoparticles by biogenic method using aqueous leaf extract of Calotropis procera which acts as a reducing and stabilizing agent. The as prepared ZnO nanoparticles were characterized by a host of different techniques such as X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FT-IR). The XRD pattern confesses that ZnO nanoparticles associate to hexagonal wurtzite structure. The DRS absorption spectrum shows an absorption edge at 397 nm corresponds to the ground excitonic peak of ZnO nanoparticles and the band gap is found to be 3.1 eV. The FT-IR spectra indicate the presence of hydroxyl groups, aldehydes, amines, ketones, and carboxylic acids which are responsible for biochemical reaction. TEM images shows that the particles of ZnO have spherical shape with size ranging from 15 to 25 nm. ZnO nanoparticles were subjected to photocatalytic application for the degradation of methyl orange under UV light. The photodegradation efficiency of MO was found to be 81% within 100 min under UV light, such an excellent activity is obtained by biogenic ZnO NPs

*Prof. K. M. Garadkar [email protected] 1 Nanomaterials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra 416004, India 2 Nanoparticles Processing Laborat

Fig.1. XRD pattern of synthesized ZnO NPs.

Fig.2. DRS spectrum of synthesized ZnO NPs.

Fig.3a-b. FT-IR spectra of, a) Aqueous leaf extract of C. P. And b) Synthesized ZnO NPs.

Fig.4 a-d. a-b) TEM images of ZnO NPs with different magnifications., c) HR-TEM of ZnO and d) SAED pattern of ZnO.

Fig. 5. Plausible reaction mechanism of formation of ZnO NPs by using leaf extract of Calotropis procera.

Fig. 6. UV-Vis. absorption spectra of degradation of MO under UV light

1. Fig.7. Images of photodegradation of MO with to time.

Fig .8. A plot of C/C0 with time for the photodegradation of MO