Porous SNO2/TI dimensionally stable anode for degradation of pollutants from water : synthesis and morphostructural characterization

In this work, the protocol based on Doctor-Blade method for synthesis of porous SnO2/Ti dimensionally stable anode suitable for advanced treatment of water/wastewater is presented. Prior to SnO2/Ti synthesis, SnO2 was obtained by sol-gel method using SnCl2 as Sn precusor and polyethylene glycol. The morpho-structural characterization through X-ray diffraction (XRD) and scanning electron microscopy coupled with energy-dispesive X-ray (SEM/EDX) confirmed an uniform deposition of SnO2 mesoporous on the Ti surface with typical mud cracked-like structure, which should be suitable for the further water treatment application

Preparation of mesoporous TiO2 by sol-gel and hydrothermal methods

Over the last years, there has been increasing interest in the application of TiO2 with nanosized powders or mesoporous structure for gas sensing, photocatalysts, photoelectrodes, and solar energy conversion. In these applications, the control of morphology, particle size, distribution, phase composition, and porosity of TiO2 is a primary factor in determining the properties of the final materials. Mesoporous TiO2 has a large surface area because of its confined porous structure and high surface to volume ratio, and also it should have a higher photocatalytic activity, because of the improved access to the active sites of TiO2 [1]. To prepare TiO2 mesoporous nanoparticles, is not such a simple work, because the raw materials, obtaining materials conditions such as the temperature, stirring rate, ionic strength, acidity, reactant ratios, and the temperature calcination influence their formation. Mesoporous TiO2 nanoparticles can be prepared through a few methods, like hydrothermal synthesis, evaporation-induced self assembly, precipitation reaction, or the sol–gel process [2]. In this study, we report the preparation and characterization mesoporous TiO2 by sol-gel and hydrothermal methods using hexadecylamine and Pluronic 127 like surfactant-template. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET

Development of the Zn-ZnO(Nw)@CuMnO2 Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication

In this study, the Zn-ZnO(Nw)@CuMnO2 heterostructure was successfully achieved by deposition of a bidimensional CuMnO2 film on the ZnO nanowires (NWs) layer, by the spin coating method. The novelty of this research is related to the growth of ZnO NWs by thermal oxidation at low temperatures, below the melting point of the Zn foil in a controlled atmosphere consisting of a mixed flow gas, Ar and O2. The structural and morphological properties of the heterostructures were assessed by XRD, UV-Vis, and SEM techniques. The as-obtained gas sensors based on Zn-ZnO(Nw)@CuMnO2 heterostructures were tested to detect 400 ppm. CO2 concentration at variable testing temperatures inside the testing chamber. The maximum sensibility value of 85.5% was obtained at the lowest operating temperature of 150 °C for the ZnONw5@CMO sensor, and when the temperature was increasing to 200 °C the sensibility response of 95.4% was recorded for the ZnONw7@CMO sensor. Current-voltage and current-time measurements were performed under different conditions to assess the heterojunction behavior and sensibility of the gas sensor