1. Design and characterization of ▫$CeO_2$▫ nanoparticles with controlled morphologyJelena Maletaškić, Marija Prekajski-Đorđević, Nadežda Radmilović, Nina Daneu, Svetlana Butulija, Aleksandra R. Zarubica, Jelena Erčić, Branko Matović, 2025, original scientific article Abstract: CeO2 nanoparticles with isometric and rod-like morphologies were successfully synthesized through a simple hydrothermal method. The morphological evolution between isometric and nanorod morphologies was achieved by adjusting the concentration of NaOH, which affects the formation and morphological evolution of CeO2 nanoparticles. The structure and properties of the CeO2-xNaOH powders were characterized by powder X-ray diffraction, Raman spectroscopy, low temperature nitrogen adsorption, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Also, the ceria nanopowders were tested as a photocatalyst for the photodegradation of crystal violet dye in an aqueous solution. In summary, a straightforward and controllable approach for synthesizing CeO2 nanoparticles with isometric and/or rod-like morphologies was demonstrated, utilizing simple starting materials in a hydrothermal system. The results present an economical method for synthesizing nanosized ceria and related materials. Additionally, understanding of the mechanism of morphology evolution provides new insights and strategies for the controlled synthesis of nanostructures.
Keywords: ceria, nanopowders, hydrothermal synthesis
Published in DiRROS: 02.03.2026; Views: 229; Downloads: 162
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2. Tuning the photocatalytic activity of nanocrystalline titania by phase composition control and nitrogen doping, using different sources of nitrogenNejc Rozman, Luka Škrlep, Miran Gaberšček, Andrijana Sever Škapin, 2014, original scientific article Abstract: Titania nanoparticles were synthesized by employing the hydrothermal method and using TiOSO4as a titanium source. By varying pH between 0.5 and 1.0 and adding isopropanol to the hydrothermal reaction mixture, different mixtures of anatase, rutile, and brookite were obtained. The samples were also doped with nitrogen at different N concentrations using, respectively, urea, ammonium nitrate, and tripropylamine as nitrogen sources. The samples were characterized by X-ray powder diffraction, field emission scanning electron microscopy, infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy and according to their specific surface area. Additionally, their photocatalytic activity was measured in a gas-solid reactor system. The results show that low pH favours rutile formation, whereas a higher pH yields mixed phase titania polymorphs. Isopropanol addition also favours rutile formation, and boosted the photocatalytic activity of the resulted particles. Contrary to most data in the literature, rutile turned out to be the more active phase in the present investigation. Nitrogen doping, on the other hand, did not contribute to higher photocatalytic activity, but was rather detrimental to it.
Keywords: titanium dioxide, rutile, hydrothermal synthesis, photocatalysis, nitrogen doping
Published in DiRROS: 26.09.2025; Views: 601; Downloads: 277
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3. Component optimization of ▫$g-C_3N_4/TiO_2$▫ hetero-structure composite and its activity enhancement for photocatalytic degradation of rhodamine BZikang Cao, Yating Liu, Luqi Wang, Xu Gao, Sitian Chen, Sitian Cheng, Yan Yu, Li Li, 2025, original scientific article Keywords: hydrothermal synthesis, g-C3N4, TiO2, photocatalysis
Published in DiRROS: 21.02.2025; Views: 934; Downloads: 530
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4. Hydrothermal synthesis and characterization of ZSM-5 zeolite from anorthosite: impacts of reaction time and temperatureYonas Desta Bizualem, Mudasir Akbar Shah, Soumaya Ibrahimi, Aicha Gasmi, Noureddine Elboughdiri, 2025, original scientific article Keywords: anorthosite, zeolite, hydrothermal synthesis, ZSM-5
Published in DiRROS: 21.02.2025; Views: 985; Downloads: 505
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5. New insights into manganese local environment in MnS-1 nanocrystalsAlenka Ristić, Matjaž Mazaj, Iztok Arčon, Nina Daneu, Nataša Zabukovec Logar, Roger Gläser, Nataša Novak Tušar, 2019, original scientific article Keywords: MnS-1 nanocrystals, Mn XANES, EXAFS, zeolites, microwave-assisted hydrothermal synthesis
Published in DiRROS: 23.11.2020; Views: 15428; Downloads: 1827
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6. Structural and degradation studies of a biocompatible Zn-L-tartrate metal-organic frameworkAna Palčić, Andreas Puškarić, Matjaž Mazaj, Emanuela Žunkovič, Nataša Zabukovec Logar, Josip Bronić, 2015, original scientific article Abstract: New anhydrous Zn-l-tratrate was synthesized under hydrothermal conditions. Crystal structure which was solved by powder X-ray diffraction data from monoclinic unit cell (I2, a=11.7557(1), b=9.0319(1), c=5.0750(1), β=91.920(1)) consists of the three-dimensional framework where each Zn atom coordinates four tartrate ligands in distorted octahedral geometry. Due to its biocompatible components, the degradation of material was studied in aqueous media under different pH values (pH=1–7) and in the simulated body fluid (pH=7.4) performed by the measurement of the released Zn2+ concentrations at thermostatic conditions (37 °C). The results showed that under acidic conditions approximately 60% of Zn2+ is released from the investigated material after 6 h of degradation process. With the increase of the solution’s pH, the rate of degradation gradually decreases. XRD and SEM analyses indicate that in aqueous media the compound slowly disintegrates and does not undergo hydrolysis process regardless of pH. Biocompatibility of the compound and its controllable rate of degradation even in acid conditions open its potential use in the fields of bio-applications.
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The degradation kinetics of Zn-l-tar MOF material in aqueous media at different pH conditions.
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Keywords: Zn-tartrate, coordination polymers, hydrothermal synthesis, biomedical application, food supplement
Published in DiRROS: 26.01.2015; Views: 7000; Downloads: 961
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