Title
Zinc oxide nanoparticlesSolvothermal treatmentPrecipitationAlkaline mediaUltrasonic cavitationZnO mesoporous
Author
Daniel Navas, Andrés Ibañez, Iván González, Juan Luis Palma, Paulina Dreyse
Year
2020
Journal
Heliyon
Abstract
Zinc oxide nanoparticles were successfully synthesized under precipitation processes, using ZnSO4·7H2O as a Zn2+ precursor and K2CO3 used as a basic source, and hydrozincite was obtained as an intermediary, which was treated under two procedures; first procedure involved multiple stages to get final precipitated with NaOH, and in the second procedure the hydrozincite was straightforwardly dried at 220 °C. By both processes ZnO structures were obtained, which were turned into nanoparticles by a solvothermal treatment, for four hours in ethylene glycol at 200 °C. The final products for the first procedure was conglomerate of spherical nanoparticles with sizes ranged between 5–10 nm and dispersed ellipsoidal nanoparticles for the second procedure.
Apart off the two procedures mentioned above, another synthesis was carried out with the same Zn2+ precursor but now using NaOH, and the solvothermal treatment produced ZnO mixed micro-structures which under ultrasonic cavitation disaggregated on mesoporous ZnO nanoplates of hexagonal shapes with nanopore sizes of approximately 0.35 nm. All ZnOs synthesized were structurally characterized with XRD, TEM and FT–IR techniques, and electronically with UV–Vis absorption and diffuse reflectance spectroscopies.
Instrument
FTIR-4600
Keywords
Zinc oxide nanoparticles, Solvothermal treatment, Precipitation, Alkaline media, Ultrasonic cavitation, ZnO mesoporous