جستجوی مقالات مرتبط با کلیدواژه « h2s gas » در نشریات گروه « شیمی »

Spray pyrolysis has been used to fabricate different mixed TiO2/NiO/In2O3 nanostructures. TiO2/NiO/In2O3 has been structurally and optically explored using X-ray diffraction, field emission scanning electron microscopy, and UV-Vis spectroscopy. The particles analysis using X-ray diffraction had a polycrystalline structure and all of the observed peaks can be assigned to the samples with nanostructure, while FESEM reveals that they are very small, spherical, and range in size from 14 to 100 nm. The UV-Vis observed the edge of absorbance at about 335-305 nm; the energy band gap was calculated to be 3.3-3.58 eV. The absorbance in this area is caused by the creation of TiO2/NiO/In2O3 nanoparticles. The synthesis of thin films was tested in gas sensor applications. The gas response of the tested samples to hydrogen sulfide gas at different operating temperatures was analysed. The thin film demonstrates that when the operating temperature got higher, sensitivity increased as well. With an increase in operational temperature, recovery and response times are slowed down.

The nano-sized structure of well-ordered Zn@MCM-41 adsorbent was synthesized through a direct hydrothermal method using CTAB as a structure-directing agent in an ammonia aqueous solution with different amounts of zinc acetylacetonate which were inserted into the structure-directing agent’s loop during the synthesis. The XRD, HRTEM, and N2 adsorption-desorption isotherms were used to characterize the prepared ZnO functionalized mesoporous silica samples. As a result, the presence of ZnO in highly-ordered MCM-41’s pore was proved as well as maintenance of the ordered meso-structure of MCM-41. The materials were possessed with a high specific surface area (1114-509 m2 g-1) and a large pore diameter (4.03-3.27 nm). Based on the obtained results from the adsorption of H2S gas in a lab-made setup, the Znx@MCM-41 showed the superior ability to increase of ZnO amount up to 7 hours as a breakthrough point. A two factor (zinc percent and temperature) experimental design with three levels was accomplished to optimize the adsorption parameters. The influence of parameters and the interactions on the adsorption of H2S were studied and optimized. Also, the H2S breakpoint curves carried on by UOP163 method.