TY - JOUR AU - Tóth, Zsejke-Réka AU - Debreczeni, Diána AU - Gyulavári, Tamás AU - Székely, István AU - Todea, Milica AU - Kovács, Gábor AU - Focșan, Monica AU - Magyari, Klára AU - Baia, Lucian AU - Pap, Zsolt AU - Hernádi, Klára TI - Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 13 PY - 2023 IS - 1 PG - 14 SN - 2079-4991 DO - 10.3390/nano13010089 UR - https://m2.mtmt.hu/api/publication/33530681 ID - 33530681 AB - The widespread use of Ag3PO4 is not surprising when considering its higher photostability compared to other silver-based materials. The present work deals with the facile precipitation method of silver phosphate. The effects of four different phosphate sources (H3PO4, NaH2PO4, Na2HPO4, Na3PO4·12 H2O) and two different initial concentrations (0.1 M and 0.2 M) were investigated. As the basicity of different phosphate sources influences the purity of Ag3PO4, different products were obtained. Using H3PO4 did not lead to the formation of Ag3PO4, while applying NaH2PO4 resulted in Ag3PO4 and a low amount of pyrophosphate. The morphological and structural properties of the obtained samples were studied by X-ray diffractometry, diffuse reflectance spectroscopy, scanning electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of the materials and the corresponding reaction kinetics were evaluated by the degradation of methyl orange (MO) under visible light. Their stability was investigated by reusability tests, photoluminescence measurements, and the recharacterization after degradation. The effect of as-deposited Ag nanoparticles was also highlighted on the photostability and the reusability of Ag3PO4. Although the deposited Ag nanoparticles suppressed the formation of holes and reduced the degradation of methyl orange, they did not reduce the performance of the photocatalyst. LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Zsejke-Réka AU - Hernádi, Klára AU - Baia, Lucian AU - Kovács, Gábor AU - Pap, Zsolt TI - Controlled formation of Ag-AgxO nanoparticles on the surface of commercial TiO2 based composites for enhanced photocatalytic degradation of oxalic acid and phenol JF - CATALYSIS TODAY J2 - CATAL TODAY VL - 424 PY - 2023 PG - 10 SN - 0920-5861 DO - 10.1016/j.cattod.2020.06.051 UR - https://m2.mtmt.hu/api/publication/31395790 ID - 31395790 AB - It is widely accepted that the photocatalytic efficiency of TiO2 can be enhanced by modifying its surface with noble metal nanoparticles, such as Ag. On the surface of TiO2, Ag nanoparticles are exposed to rapid oxidation, resulting AgxO. Therefore, in the present work, the photocatalytic activities of TiO2 composites Ag nanoparticles were investigated. They consisted of commercial titanium dioxide mixtures (Aldrich anatase and rutile) in well-defined ratios and Ag nanoparticles, which were deposited on the surface of titania, with or without using a reducing agent. The transformation of Ag nanoparticles into AgO was monitored considering the anatase/rutile ratio of the reference catalyst(s). The effect of transformation on the photocatalytic activity of commercial TiO2 was also studied via the degradation of phenol and oxalic acid under UV light irradiation. It was concluded that the Ag nanoparticles deposited on the surface of rutile could increase the efficiency of charge separation. In the case of anatase, similar results were obtained for the as-formed amorphous AgO nanoparticles. The tertiary and quaternary composites generally exhibited higher photocatalytic efficiencies towards oxalic acid degradation than the corresponding commercial TiO2 mixtures. Ag nanoparticles were found to be unstable during the experiments as they transformed into Ag2O, which could transform back to Ag during the photocatalytic processes, under appropriate conditions. On the other hand, the stability of AgO was not affected during the aging period. Therefore, it was deduced that AgO is more stable on the surface of anatase compared to Ag and Ag2O nanoparticles deposited on the surface of rutile. © 2020 LA - English DB - MTMT ER - TY - CONF AU - Tóth, Zsejke-Réka AU - Pap, Zsolt AU - Hernádi, Klára AU - Kovács, Gábor TI - Synthesis, characterization and stability issues of Ag-based photoactive materials T2 - 1st International Conference (Online) Trends and Research in Chemistry (TRIC-2022) PY - 2022 SP - 69 UR - https://m2.mtmt.hu/api/publication/33116980 ID - 33116980 LA - English DB - MTMT ER - TY - CONF AU - Magyari, Klára AU - Tóth, Zsejke-Réka AU - Alexandra, Feraru AU - Alina, Sesarman AU - Dan, C. Vodnar AU - Lucian, Baia TI - Silver species transformation in biological environment T2 - Bionanotechnology, biosensor, biocompatibility and biomaterials PY - 2022 SP - 32 UR - https://m2.mtmt.hu/api/publication/33116175 ID - 33116175 LA - English DB - MTMT ER - TY - CONF AU - Lenuța, Nastasia RĂZVANȚĂ AU - Tóth, Zsejke-Réka AU - Lucian, C. POP AU - Lucian, BAIA AU - Magyari, Klára TI - Synthesis and morpho-structural characterization of cerium (IV) oxide nanoparticles obtained in different pH environments T2 - the XVIIIth edition of the INTERNATIONAL CONFERENCE STUDENTS FOR STUDENTS PY - 2022 SP - 87 EP - 88 PG - 2 UR - https://m2.mtmt.hu/api/publication/33107828 ID - 33107828 LA - English DB - MTMT ER - TY - CONF AU - Alexandra, Feraru AU - Tóth, Zsejke-Réka AU - Magyari, Klára AU - Lucian, Baia TI - Alginate-Based Biocomposites Hydrogels Reinforced with Natural Polymers Used in Tissue Engineering: Structural and Physicochemical Properties T2 - 32nd Annual Conference of the European Society for Biomaterials PY - 2022 SP - 140 UR - https://m2.mtmt.hu/api/publication/33107345 ID - 33107345 LA - English DB - MTMT ER - TY - CONF AU - Tóth, Zsejke-Réka AU - Lenuța, Nastasia Răzvanță AU - Alexandra, Feraru AU - Emilia, Licarete AU - Lucian, Baia AU - Magyari, Klára TI - Synthesis and morphological & structural characterization of metal oxides and their behavior in biological medium T2 - Book of Abstracts – Posters PY - 2022 SP - 165 UR - https://m2.mtmt.hu/api/publication/33107344 ID - 33107344 LA - English DB - MTMT ER - TY - CONF AU - Tóth, Zsejke-Réka AU - Răzvanță, Lenuța Nastasia AU - Feraru, Alexandra AU - Baia, Lucian AU - Magyari, Klára TI - The effect of the concentration of NaOH on the synthesis and applicability of CeO2 nanoparticles T2 - The effect of the concentration of NaOH on the synthesis and applicability of CeO2 nanoparticles PY - 2022 SP - 0 UR - https://m2.mtmt.hu/api/publication/33107245 ID - 33107245 LA - English DB - MTMT ER - TY - JOUR AU - Magyari, Klára AU - Tóth, Zsejke-Réka TI - Bioanyagok a mindennapokban JF - FIRKA: AZ ERDÉLYI MAGYAR MŰSZAKI TUDOMÁNYOS TÁRSASÁG KIADVÁNYA FIATALOK RÉSZÉRE J2 - FIRKA VL - 31 PY - 2022 IS - 4 SP - 14 EP - 20 PG - 7 SN - 1224-371X UR - https://m2.mtmt.hu/api/publication/33101568 ID - 33101568 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kovács, Zoltán AU - Molnár, Csanád AU - Gyulavári, Tamás AU - Magyari, Klára AU - Tóth, Zsejke-Réka AU - Baia, Lucian AU - Pap, Zsolt AU - Hernádi, Klára TI - Solvothermal synthesis of ZnO spheres: tuning the structure and morphology from nano- to micro-meter range and its impact on their photocatalytic activity JF - CATALYSIS TODAY J2 - CATAL TODAY VL - 397-399 PY - 2022 SP - 16 EP - 27 PG - 12 SN - 0920-5861 DO - 10.1016/j.cattod.2022.03.004 UR - https://m2.mtmt.hu/api/publication/32727109 ID - 32727109 LA - English DB - MTMT ER -