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Publikācija: Cellular Biomorphic Ceramics for Catalytic Oxidation of Phenol in Aqueous Solution

Publication Type Conference paper
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Cellular Biomorphic Ceramics for Catalytic Oxidation of Phenol in Aqueous Solution
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Research platform Materials, Processes, and Technologies
Authors Gaida Maruta Sedmale
Mārtiņš Randers
Līga Grase
Māris Rundāns
Keywords Biomorphic ceramics, catalytic oxidation, phenol
Abstract It is known that through synthesis or assembly using a wide range of natural templates from nano- to mega-scale dimensions, a wide range of biomorphic materials materials for different uses can be developed . There are few studies that focus on the use of clay or silica nanoparticles for the production of biomorphic mineralized materials. This presentation focus on the results of developing the biomorphic cellular ceramics obtained by use of natural templates (lichen), infiltrated with illite clay nanoparticles and mineralized at elevated temperatures to use as possible material for catalytic oxidation of phenol in aqueous solution. The technological approaches used for the formation and investigation of mineralized cellular ceramic samples included the steps and objectives, which are typical for ceramic technology. The phase compositions and structure of mineralized samples were determined (accordingly) by X-ray diffraction (apparatus D8 Advance, Bruker) add by scanning electron microscopy (SEM, Nova NanoSEM 650) An image-processing program was used to determine the average size of particles. Fourier transform infrared spectroscopy (FTIR, Prestige Shimadzu Corp.) was applied to detect typical link fluctuations in samples. The specific surface areas of both the clay particles in slurry and mineralized samples were calculated by the nitrogen adsorption method (BET).The catalytic oxidation degree of phenol was controlled for 0.005 molar phenol aqueous solution by use of COD cell test method. It is shown that the texture of templates infiltrated by clay slurry remains the same after mineralization – sintering by temperatures between 800ᵒC and 1000ᵒC in air and in nitrogen environment. The samples have relatively low bulk density and compressive strength. The crystalline phase composition and structure for both mineralized in air and in nitrogen environment differ. For samples mineralized in the nitrogen environment, the presence of different particles with sizes ranging from 400 nm to 850 nm is typical and correspond to carbon spots and iron as a reduced form of iron-containing components of clay. Conversely samples mineralized in air consist of poorly structured platelets and crystalline arrangements characteristic for illite clay ceramics For both - small amorphous areas and pores are visible on the surfaces of platelets and between them. The results of catalytic oxidation of phenol in aqueous solution over supported mineralized ceramic samples (taking into account the conditions chosen) show relatively low. Acknowledgements This study has been carried out with financial support from the European Regional Development Fund under the project 1.1.1.1/16/A/077 “Mineral and Synthetic Nanopowders for Obtaining of Porous Ceramics and Modification of Ceramic Materials”.
Reference Sedmale, G., Randers, M., Grase, L., Rundāns, M. Cellular Biomorphic Ceramics for Catalytic Oxidation of Phenol in Aqueous Solution. In: Conference ERA: World Congress on Functional Materials and Nanotechnology, Spain, Valencia, 13-15 May, 2019. Hyderbad: 2019, pp.32-33.
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