Novel Green Route of Synthesis of ZnO Nanoparticles by Using Natural Biodegradable Polymer and Its Application as a Catalyst for Oxidation of Aldehydes

Abstract

ZnO nanoparticles have been synthesized by using biodegradable natural biopolymer viz. Gum Tragacanth. This single step approach is very cost effective and reproducible. The reaction time and concentration of precursor zinc acetate play a major role in the nature and growth of ZnO nanoparticles. ZnO nanoparticles were characterized by X-ray diffraction, SEM, FTIR, EDAX, UVvisible spectroscopy and TEM. ZnO nanoparticles with 20-30 nm in diameter and hexagonal morphology were found; dispersed uniformly. Raman spectrum shows the mode E 2 high at 437 cm ¡1 that is related to the vibration of wurtzite Zn-O bond in crystal structure of ZnO. The space between adjacent lattice fringes is » sharp 2.42 A . UV-visible absorption spectrum shows the sharp absorption band at 308 nm assigned to the intrinsic transition from valance band to conduction band. The ZnO nanoparticles display superior catalytic activity of conversion of aldehyde to acid as compared to bulk-ZnO material, because of high surface area of ZnO nanoparticles. A trace amount of ZnO nanoparticles catalyst required for organic conversion. The ZnO nanoparticles as catalyst are highly stable, recyclable and efficient in its activity.

ZnO microparticle‐loaded chitosan/poly(vinyl alcohol)/acacia gum nanosphere‐based nanocomposite thin film wound dressings for accelerated wound healing

“…The weak peaks at 1413 cm −1 and 1591 cm −1 were assigned to the asymmetric and symmetric modes of the carboxylate anion (COO─), respectively. This result is in good agreement with the previous studies …”

A novel synthesis of nanoflower-like zinc borate from zinc oxide at room temperature

“…Moreover, from both spectra, the stretching vibrations of the H-O-H bands can be seen between 1500-1800 cm −1 , which are assigned to the crystalline water incorporated in the compound [8]. Moreover, the peak at approximately 457 cm -1 is related to the symmetric stretching of Zn-O, which can be seen in both spectra [22]. It is also can be seen that the bands at 1643 cm −1 and 1726 cm −1 indicate the stretching vibration of C=C and C=O functionalities, respectively [23].…”

Hydrodesulphurization of Thiophenes over CoMoRe/ ZSM 5gama-Al2O3 Catalyst

“…800, 560, and 460 cm -1 correspond to the T-O-T deformation tensile vibration, respectively [14]. ZnO can not be identified because it has spectral bands at about 460 cm -1 and 545 cm -1 [15] overlapping with Mo-O specific bands which also have 560 cm -1 or Si-O-Si spectral bands 466 cm -1 . After the sulfurization, the absorption maxima do not change but only the transmittance, which highlights the correctness of the spectrum interpretation.…”