TY - JOUR AU - Solymos, Karolina AU - Babcsányi, Izabella AU - Ariya, Badam AU - Gyulavári, Tamás AU - Ágoston, Áron AU - Szamosvölgyi, Ákos AU - Kukovecz, Ákos AU - Kónya, Zoltán AU - Farsang, Andrea AU - Pap, Zsolt TI - Photocatalytic and surface properties of titanium dioxide nanoparticles in soil solutions JF - ENVIRONMENTAL SCIENCE-NANO J2 - ENVIRON SCI-NANO VL - 11 PY - 2024 IS - 3 SP - 1204 EP - 1216 PG - 13 SN - 2051-8153 DO - 10.1039/D3EN00622K UR - https://m2.mtmt.hu/api/publication/34513997 ID - 34513997 AB - Nanotechnology has emerged as a rapidly growing scientific field with diverse applications. Titanium dioxide nanoparticles are among the most commonly used nanoparticles due to their unique properties. However, their release... LA - English DB - MTMT ER - TY - GEN AU - Gyulavári, Tamás AU - Kata, Kovács AU - Zoltán, Kovács AU - Veréb, Gábor AU - Hernádi, Klára AU - Pap, Zsolt TI - Titanium dioxide hollow spheres for water treatment utilizing enhanced light trapping capability PY - 2023 UR - https://m2.mtmt.hu/api/publication/34409056 ID - 34409056 LA - English DB - MTMT ER - TY - CONF AU - Gyulavári, Tamás AU - Shah Abedi, Mahsa AU - Kukovecz, Ákos AU - Kónya, Zoltán AU - Pap, Zsolt ED - Majdik, Cornelia TI - Gyorskalcinálással előállított kalcium-titanátok fotokatalitikus aktivitásának és stabilitásának vizsgálata T2 - XXIX. Nemzetközi Vegyészkonferencia / 29th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34409051 ID - 34409051 LA - Hungarian DB - MTMT ER - TY - CONF AU - Fazekas, Ákos Ferenc AU - Gyulavári, Tamás AU - Pap, Zsolt AU - Bodor, Attila AU - Laczi, Krisztián AU - Perei, Katalin AU - Nyergesné Illés, Erzsébet AU - László, Zsuzsanna AU - Veréb, Gábor ED - Majdik, Cornelia TI - Effects of oil composition and CNT functionalizaton on the membrane filtration of oily wastewaters with TiO2/(f)CNT composite-coated PVDF membranes T2 - XXIX. Nemzetközi Vegyészkonferencia / 29th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2023 SP - 1 EP - 1 PG - 1 UR - https://m2.mtmt.hu/api/publication/34407456 ID - 34407456 LA - English DB - MTMT ER - TY - JOUR AU - Yadav, Mohit AU - Gyulavári, Tamás AU - Kiss, János AU - Ábrahámné, Kornélia B. AU - Efremova, Anastasiia AU - Szamosvölgyi, Ákos AU - Pap, Zsolt AU - Sápi, András AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Noble metal nanoparticles and nanodiamond modified strontium titanate photocatalysts for room temperature CO production from direct hydrogenation of CO2 JF - JOURNAL OF CO2 UTILIZATION J2 - J CO2 UTIL VL - 78 PY - 2023 PG - 9 SN - 2212-9820 DO - 10.1016/j.jcou.2023.102621 UR - https://m2.mtmt.hu/api/publication/34395096 ID - 34395096 LA - English DB - MTMT ER - TY - JOUR AU - Fazekas, Ákos Ferenc AU - Gyulavári, Tamás AU - Pap, Zsolt AU - Bodor, Attila AU - Laczi, Krisztián AU - Perei, Katalin AU - Nyergesné Illés, Erzsébet AU - László, Zsuzsanna AU - Veréb, Gábor TI - Effects of Different TiO2/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters JF - MEMBRANES (BASEL) J2 - MEMBRANES-BASEL VL - 13 PY - 2023 IS - 10 PG - 17 SN - 2077-0375 DO - 10.3390/membranes13100812 UR - https://m2.mtmt.hu/api/publication/34166716 ID - 34166716 N1 - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation Office-NKFIH [NKFI_FK_20_135202] Funding text: This research was funded by the Hungarian National Research, Development and Innovation Office-NKFIH in the framework of the "Development and application of nanoparticle modified membranes for the efficient treatment of oil-contaminated waters" project (NKFI_FK_20_135202). AB - Six different TiO2/CNT nanocomposite-coated polyvinylidene-fluoride (PVDF) microfilter membranes (including –OH or/and –COOH functionalized CNTs) were evaluated in terms of their performance in filtering oil-in-water emulsions. In the early stages of filtration, until reaching a volume reduction ratio (VRR) of ~1.5, the membranes coated with functionalized CNT-containing composites provided significantly higher fluxes than the non-functionalized ones, proving the beneficial effect of the surface modifications of the CNTs. Additionally, until the end of the filtration experiments (VRR = 5), notable flux enhancements were achieved with both TiO2 (~50%) and TiO2/CNT-coated membranes (up to ~300%), compared to the uncoated membrane. The irreversible filtration resistances of the membranes indicated that both the hydrophilicity and surface charge (zeta potential) played a crucial role in membrane fouling. However, a sharp and significant flux decrease (~90% flux reduction ratio) was observed for all membranes until reaching a VRR of 1.1–1.8, which could be attributed to the chemical composition of the oil. Gas chromatography measurements revealed a lack of hydrocarbon derivatives with polar molecular fractions (which can act as natural emulsifiers), resulting in significant coalescent ability (and less stable emulsion). Therefore, this led to a more compact cake layer formation on the surface of the membranes (compared to a previous study). It was also demonstrated that all membranes had excellent purification efficiency (97–99.8%) regarding the turbidity, but the effectiveness of the chemical oxygen demand reduction was slightly lower, ranging from 93.7% to 98%. LA - English DB - MTMT ER - TY - JOUR AU - Gyulavári, Tamás AU - Veréb, Gábor AU - Pap, Zsolt AU - Hernádi, Klára TI - Titán-dioxid fotokatalizátorok fotokatalitikus aktivitásának növelése JF - MAGYAR KÉMIAI FOLYÓIRAT - KÉMIAI KÖZLEMÉNYEK (1997-) J2 - MAGY KÉM FOLY KÉM KÖZL VL - 129 PY - 2023 IS - 1 SP - 39 EP - 44 PG - 6 SN - 1418-9933 DO - 10.24100/MKF.2023.01.39 UR - https://m2.mtmt.hu/api/publication/34039621 ID - 34039621 N1 - "Gyulavári Tamás azonos című PhD értekezése és az ahhoz kapcsolódó tézisfüzet alapján készült." LA - Hungarian DB - MTMT ER - TY - JOUR AU - Székely, István AU - Kovács, Zoltán AU - Rusu, Mihai AU - Gyulavári, Tamás AU - Todea, Milica AU - Focșan, Monica AU - Baia, Monica AU - Pap, Zsolt TI - Tungsten Oxide Morphology-Dependent Au/TiO2/WO3 Heterostructures with Applications in Heterogenous Photocatalysis and Surface-Enhanced Raman Spectroscopy JF - CATALYSTS J2 - CATALYSTS VL - 13 PY - 2023 IS - 6 PG - 33 SN - 2073-4344 DO - 10.3390/catal13061015 UR - https://m2.mtmt.hu/api/publication/34030718 ID - 34030718 AB - Developing highly efficient Au/TiO2/WO3 heterostructures with applications in heterogeneous photocatalysis (photocatalytic degradation) and surface-enhanced Raman spectroscopy (dye detection) is currently of paramount significance. Au/TiO2/WO3 heterostructures were obtained via heat or time-assisted synthesis routes developed by slightly modifying the Turkevich–Frens synthesis methods and were investigated by TEM, SEM, XRD, Raman spectroscopy, XPS, photoluminescence, and UV–vis DRS techniques. Structural features, such as WO3 crystalline phases, TiO2 surface defects, as well as the WO3 (220) to TiO2-A (101) ratio, were the key parameters needed to obtain heterostructures with enhanced photocatalytic activity for removing oxalic acid, phenol, methyl orange, and aspirin. Photodegradation efficiencies of 95.9 and 96.9% for oxalic acid; above 96% (except one composite) for phenol; 90.1 and 97.9% for methyl orange; and 81.6 and 82.1% for aspirin were obtained. By employing the SERS technique, the detection limit of crystal violet dye, depending on the heterostructure, was found to be between 10−7–10−8 M. The most promising composite was Au/TiO2/WO3-HW-TA it yielded conversion rates of 82.1, 95.9 and 96.8% for aspirin, oxalic acid, and phenol, respectively, and its detection limit for crystal violet was 10−8 M. Au/TiO2/WO3-NWH-HA achieved 90.1, 96.6 and 99.0% degradation efficiency for methyl orange, oxalic acid, and phenol, respectively, whereas its limit of detection was 10−7 M. The Au/TiO2/WO3 heterojunctions exhibited excellent stability as SERS substrates, yielding strong-intensity Raman signals of the pollutant molecules even after a long period of time. LA - English DB - MTMT ER - TY - JOUR AU - Boga, Bíborka AU - Cristea, Vasile-Mircea AU - Székely, István AU - Lorenz, Felix AU - Gyulavári, Tamás AU - Pop, Lucian Cristian AU - Baia, Lucian AU - Pap, Zsolt AU - Steinfeldt, Norbert AU - Strunk, Jennifer TI - Experimental data-driven and phenomenological modeling approaches targeting the enhancement of CaTiO3 photocatalytic efficiency JF - SUSTAINABLE CHEMISTRY AND PHARMACY J2 - SUSTAIN CHEM PHARM VL - 33 PY - 2023 PG - 16 SN - 2352-5541 DO - 10.1016/j.scp.2023.101045 UR - https://m2.mtmt.hu/api/publication/33714381 ID - 33714381 LA - English DB - MTMT ER - TY - JOUR AU - Márta, Viktória AU - Pap, Zsolt AU - Bárdos, Enikő AU - Gyulavári, Tamás AU - Veréb, Gábor AU - Hernádi, Klára TI - Effect of Urea as a Shape-Controlling Agent on the Properties of Bismuth Oxybromides JF - CATALYSTS J2 - CATALYSTS VL - 13 PY - 2023 IS - 3 PG - 13 SN - 2073-4344 DO - 10.3390/catal13030616 UR - https://m2.mtmt.hu/api/publication/33709488 ID - 33709488 AB - Bismuth oxybromides were prepared via a solvothermal method by applying different urea amounts during synthesis. The effects of the urea ratio on the morpho–structural properties and photocatalytic activity of the samples were investigated. X-ray diffraction, diffuse reflectance spectroscopy, infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, and surface tension measurements were carried out to characterize the samples. Their photoactivity was evaluated by the photocatalytic degradation of rhodamine B and ibuprofen under UV and visible light irradiations. The urea ratio notably influenced morphology, particle size distribution, and photoactivity. However, it only had a limited effect on the crystalline composition, primary crystallite size, and band gap of bismuth oxybromides. The formation of Bi-based complexes and degraded urea-based products were observed, which were deduced to influence band gap energies and hence, photoactivity. Predominantly, samples prepared at low urea ratios proved to be the best for both rhodamine B and ibuprofen degradations under both irradiations. LA - English DB - MTMT ER -