Ravikumar Kolekar, Suresh Baburao Kapatkar and Shridhar Narasinhmurthy Mathad
.R.; Shinde, S.S.; Moholkar, A.V.; Bhosale, J.; Kim, H.; Rajpure, K.Y. Physical properties of sprayed antimony doped tin oxide thin films: The role of thickness. J. Semicond . 2011 , 32(5) , 053001–053008.
28. Prabhu, Y.T.; Rao, K.V.; Kumar, V.S.S.; Kumari, B.S. X-ray analysis by Williamson-Hall and size-strain plot methods of ZnO nano particles with fuel variation. World J. Nano Sci. Eng. 2014 , 4 , 21–28.
29. Mathad S.N. Mechanical and structuralproperties of Zn 0.1 Ni 0.4 Cu 0.5 Fe 2 O 4 ferrite, Int. J. Adv. Sci. Eng. 2018 , 5(2) , 911
This paper describes synthesis and structural properties of Ni0.45Cu0.55Mn2O4 nanopowder, obtained by co-precipitation route. XRD pattern reveals cubic structure with lattice parameter 8.305 Å. We report crystallite size (D), micro strain (ε), dislocation density (ρD), and hopping lengths (LA and LB). We also report preferential orientation by texture coefficients [Tc (h k l)]. The Williamson-Hall plot and stress-strain plot also employed to understand the mechanical properties of materials.
Justyna Pawlonka, Grzegorz Słowik, Wojciech Gac and Tadeusz Borowiecki
Microemulsion method was used for preparation of copperzinc mixed oxides. Samples were prepared from the solutions containing zinc and copper nitrates. Sodium carbonate was used as a precipitant and hydrazine as reducing agent. Water-in-oil (W/O) microemulsions were formed by the application of cyclohexane, isopropyl alcohol, and hexadecyltrimethylammonium bromide (CTAB) as surfactant. The aim of the studies was determination of the influence of the sequence of synthesis stages on the formation of materials, their surface and structural properties. Thermal decomposition studies of materials were carried out by infrared spectroscopy. The physicochemical properties were characterized by nitrogen adsorption-desorption method, X-ray diffraction (XRD) and temperature-programmed reduction (TPR).
Barbora Urminská, Ján Derco, Ronald Zakhar and Adriana Korpicsová
Natural or synthetic zeolites have unique physical, chemical and structural properties that predetermine their use in many processes, including wastewater treatment. This study presents the results of our preliminary research in the field of nitrogen and phosphorus removal using adsorption and adsorptive ozonation with natural and modified zeolites. Iron-modified zeolite was the most efficient for the removal of ammonium nitrogen by adsorption. Phosphorus removal efficiency using adsorption was relatively low and natural zeolite was not suitable for the phosphorus removal at all. Ozone had no significant impact on the removal efficiency. Regeneration of loaded zeolites with ozone has also been studied. This method was partly efficient but it needs be further examined.
Synthetic carbon adsorbents - the method of their preparation and application in adsorption and chromatography
This paper is devoted to the methods of preparation of the synthetic carbon adsorbents by carbonization of different polymer precursors and the research into the structural and surface properties of the obtained carbon adsorbents. The paper describes the research into the preparation of active carbons by carbonization of: polysufonated cation-exchanged resin, polyvinyl chloride and porous copolymer (4,4-diphenyl sulfone dimethacrylate). The carbonization of polymers was carried out in inactive atmosphere under the supervised conditions. The spherical shape of grains is a result of carbonization. The obtained carbon adsorbents were subjected to additional modification processes, i.e. hydrothermal activation in steam atmosphere, oxidation with nitric acid (6M HNO3) and heated in hydrogen (H2) atmosphere.
The adsorption from aqueous solutions of the chosen organic compounds on the modified synthetic active carbons, the adsorption of organic compounds in relation to water as well as structural characteristics of carbon adsorbents are discussed in this paper. The interaction of the organic substances and the synthetic active carbons in aqueous solutions depends on the structural properties of carbons (volume of micro- and meso-pores, distribution of pore sizes, specific surface area) and their chemical properties (i.e. concentration of functional oxygen groups, presence of mineral admixtures).