Zinc Oxide Nanoparticles In Presence Research Articles

ICMMS-2: Synthesis and Characterization of ZnO Nanoparticles in Presence of Triethanolamine (TEA) as Surfactant Via Sol-Gel

Zinc oxide (ZnO) nanoparticles have a great interest due to their important electrical and optical properties that have the potential to bring benefits to many areas of research and application. The present study is the preparation of zinc oxide nanoparticles using Sol–gel chemical method and the preparation using surfactant. The surfactant used was triethanolamine (TEA). Surfactant and unsurfactant ZnO nanoparticles were prepared to accomplish a comparative study. the properties of the prepared ZnO NPs have been characterized with the aid of many analytical techniques including Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and UV–Vis spectroscopy. The surfactant used was triethanolamine (TEA). The obtained ZnO NPs were spherical with average size of 79 nm without agglomeration. FTIR spectra showed the adsorption of TEA on the ZnO surface. The results of the UV-vis studies showed a decrease in band gap energy of 2.23eV as compared with the unsurfactant value of ZnO (3.28eV). Surfactant ZnO nanoparticles showed larger crystallite size and smaller bandgap in contrast to unsurfactant ZnO nanoparticles. TEA can use for prepare of nanomaterials with different properties for specific applications.

Photocatalytic degradation of palm oil mill secondary effluent in presence of zinc oxide nanoparticles

Based on the previous research, it has been revealed that zinc oxide nanoparticles in presence of polyethylene glycol (ZnO-PEG) have high potential for photocatalytic degradation of industrial dye wastewater. However, the study on the performance of ZnO-PEG and ZnO−CC nanoparticles to treat palm oil mill secondary effluent (POMSE) is still limited. In addition, the optimum condition for photocatalytic degradation of POMSE in presence of ZnO-PEG and ZnO−CC nanoparticles under two different power of light source which are 18 W and 500 W also not been well discovered. The aim of this study was to observe the photocatalytic degradation efficiency through percentage of color reduction for POMSE after being treated. Based on this study, the best photocatalyst and the optimum condition for photocatalytic degradation of POMSE had been identified under 18 W of UV irradiation in the presence of 0.5 g/L of ZnO-PEG nanoparticles. While for the optimum condition, it had been found that the reduction percentage of color removal (70.75 %), turbidity (87.33 %), COD (68.31 %), BOD (650.1 mg/L) were obtained. Thus, it is believed that this research will attract much attention from researchers globally, as the benefits of an environmental approach has always been in the forefront of sustainable development.

Modification of the crystal lattice and optical band gap of ZnO nanostructures by the polyelectrolytes presence

Zinc oxide (ZnO) is a group II–VI semiconductor, with electronic and photonic importance due to its wide band gap (3.37 eV) and its high exciton energy of 60 meV. In this work we study the influence of poly(p-acryloylaminophenylarsonic acid) [Poly(p-AAPHA)], poly(o-acryloylaminophenylarsonic acid) [Poly(o-AAPHA)], and polyvinylpyrrolidone (PVP) on the crystalline lattice and optical band gap of ZnO nanostructures. ZnO nanoparticles were synthesized by Ge’s method, using the polymers as stabilizing agents. Subsequently, ZnO nanoparticles were subjected to solvothermal treatment for 48 and 96 h to form nanorods of ZnO. The samples were characterized by the following methods: X-ray diffraction (XRD), diffuse reflectance spectroscopy, transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). It was determined from XRD results that the crystalline lattice of ZnO can be contracted diminishing its c parameter in the bulk of 5.20 A. Using Poly(p-AAPHA) and Poly(o-AAPHA) the new values are 5.15 and 5.16 A, respectively. On the other hand, the use of PVP causes a lattice expansion reaching 5.25 A for c parameter. The energy of the optical band gap calculated by Kubelka–Munk function was 3.22, 3.22, and 3.33 eV for ZnO nanoparticles in presence of Poly(p-AAPHA), Poly(o-AAPHA), and PVP, respectively. TEM images revealed an average size particle of 13, 14, and 17 nm for ZnO nanoparticles with Poly(p-AAPHA), PVP, and Poly(o-AAPHA), respectively. The average diameters of the ZnO nanorods were 11, 14, and 37 nm in presence of Poly(p-AAPHA), PVP, and Poly(o-AAPHA), respectively.