Sonocatalytic degradation of RB-5 dye using ZnO nanoparticles doped with transition metals.

In this study, ZnO was doped and co-doped with rhodium and tungsten to assess the impact of these transition metals on the sonocatalytic degradation of reactive black 5 azo dye (RB-5). Structural analysis revealed that doping ZnO with 1% Rh and W does not alter its wurtzite hexagonal structure, although minor changes in cell parameters were observed due to differences in electronic density. Interestingly, co-doping resulted in lower degradation efficiency than single doping, with W-ZnO emerging as the most effective catalyst, achieving 100% RB-5 degradation within 60 min, likely due to a higher density of oxygen vacancies and hydroxyl groups.

Perspectives of LaSrFeCoO perovskite obtained by Pechini and sonochemical methods: a case study.

The sonochemical method is a novel synthesis route that takes advantage of the use of ultrasonic radiation to obtain different nanomaterials with an improvement in the process variables and material characteristics. In this work, two different synthesis routes to obtain a double perovskite structure were compared in detail. The Pechini synthesis method is a widely used and effective way to obtain this kind of structure by the formation of a cross-linked network of metal cations.

Analysis of the photocatalytic activity of LaSrFeCoO perovskite as a catalyst in the degradation of RB-5 dye.

The photocatalytic efficiency of some semiconductors depends mainly on their morphological, optical, and structural properties, which can be modified by varying the calcination temperature. In order to evaluate how these properties change, as a function of temperature in a AA'BB'O perovskite material, LaSrFeCoO (LSFC) was synthesized by the Pechini method and calcined at different temperatures (600 °C, 700 °C, 800 °C, and 900 °C). All the samples were characterized structurally, morphologically, and optically by XRD, SEM, and UV-Vis spectroscopy.

Atomic-Scale Investigation on the Evolution of Tio-Anatase Prepared by a Sonochemical Route and Treated with NaOH.

To date, the formation mechanisms of TiO, as well as its heterostructures, have not been clarified. Moreover, detailed research on the transition from a tetragonal anatase phase to the monoclinic phase of the TiO(B) phase and their interface structure has been quite limited until now. In the present study, we report on the sonochemical synthesis of TiO-anatase with a crystallite size of 5.

Effect of Spin Multiplicity in O Adsorption and Dissociation on Small Bimetallic AuAg Clusters.

To dispose of atomic oxygen, it is necessary the O activation; however, an energy barrier must be overcome to break the O-O bond. This work presents theoretical calculations of the O adsorption and dissociation on small pure Au and Ag and bimetallic AuAg (n + m ≤ 6) clusters using the density functional theory (DFT) and the zeroth-order regular approximation (ZORA) to explicitly include scalar relativistic effects. The most stable AuAg clusters contain a higher concentration of Au with Ag atoms located in the center of the cluster.

Adsorption of Azo-Dye Orange II from Aqueous Solutions Using a Metal-Organic Framework Material: Iron- Benzenetricarboxylate.

A Metal-Organic Framework (MOF), iron-benzenetricarboxylate (Fe(BTC)), has been studied for the adsorptive removal of azo-dye Orange II from aqueous solutions, where the effect of various parameters was tested and isotherm and kinetic models were suggested. The adsorption capacities of Fe(BTC) were much higher than those of an activated carbon. The experimental data can be best described by the Langmuir isotherm model (R² > 0.