TY - JOUR AU - Fazekas, Ákos Ferenc AU - Gyulavári, Tamás AU - Ágoston, Áron AU - Janovák, László AU - Heszlerné Kopniczky, Judit AU - László, Zsuzsanna AU - Veréb, Gábor TI - Enhanced Photocatalytic and Filtration Performance of TiO2-Ag Composite-Coated Membrane Used for the Separation of Oil Emulsions JF - SEPARATIONS J2 - SEPARATIONS VL - 11 PY - 2024 IS - 4 SP - 112 SN - 2297-8739 DO - 10.3390/separations11040112 UR - https://m2.mtmt.hu/api/publication/34823133 ID - 34823133 AB - Polyvinylidene fluoride (PVDF) membranes were coated with TiO2 and TiO2-Ag to enhance their efficiency for oil-in-water emulsion separation. The photocatalytic activities of the two modified membranes and their filtration performances were compared in detail. The significantly enhanced photocatalytic activity of the TiO2-Ag composite was proved using a methyl orange (MO) solution (c = 10−5 M) and a crude oil emulsion (c = 50 mg·L−1). The TiO2-Ag-coated membrane reduced the MO concentration by 87%, whereas the TiO2-modified membrane reached only a 46% decomposition. The photocatalytic reduction in the chemical oxygen demand of the emulsion was also ~50% higher using the TiO2-Ag-coated membrane compared to that of the TiO2-coated membrane. The photoluminescence measurements demonstrated a reduced electron/hole recombination, achieved by the Ag nanoparticle addition (TiO2-Ag), which also explained the enhanced photocatalytic activity. A significant improvement in the oil separation performance with the TiO2-Ag-coated membrane was also demonstrated: a substantial increase in the flux and flux recovery ratio (up to 92.4%) was achieved, together with a notable reduction in the flux decay ratio and the irreversible filtration resistance. Furthermore, the purification efficiency was also enhanced (achieving 98.5% and 99.9% COD and turbidity reductions, respectively). Contact angle, zeta potential, scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements were carried out to explain the results. SEM and AFM images revealed that on the TiO2-Ag-coated membrane, a less aggregated, more continuous, homogeneous, and smoother nanolayer was formed due to the ~50% more negative zeta potential of the TiO2-Ag nanocomposite compared to that of the TiO2. In summary, via Ag addition, a sufficiently hydrophilic, beneficially negatively charged, and homogeneous TiO2-Ag-coated PVDF membrane surface was achieved, which resulted in the presented advantageous filtration properties beyond the photocatalytic activity enhancement. LA - English DB - MTMT ER - 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 - Miklós, Tímea AU - Gyulavári, Tamás AU - Hodúr, Cecilia AU - Hernádi, Klára AU - László, Zsuzsanna AU - Veréb, Gábor ED - Majdik, Cornelia TI - Development of TiO2 and TiO2/CNT nanocomposite blended and grafted PVDF membranes used for membrane separation of oil emulsions 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/34407490 ID - 34407490 LA - English 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 - CHAP AU - Pantoja Alvarez, Fernanda Liceth AU - Beszédes, Sándor AU - Gyulavári, Tamás AU - Nyergesné Illés, Erzsébet AU - Kozma, Gábor AU - Sápi, András AU - László, Zsuzsanna ED - Tünde, Alapi ED - Berkecz, Róbert ED - Ilisz, István TI - Ammonium removal from aqueous solution in presence of organic compounds, using biochar from banana leaves. Competitive isotherms models T2 - Proceedings of the 29th International Symposium on Analytical and Environmental Problems PB - University of Szeged CY - Szeged SN - 9789633069639 PY - 2023 SP - 46 EP - 46 PG - 1 UR - https://m2.mtmt.hu/api/publication/34328535 ID - 34328535 LA - English DB - MTMT ER - TY - CHAP AU - Sukmana, Hadid AU - Ballai, Gergő AU - Gyulavári, Tamás AU - Nyergesné Illés, Erzsébet AU - Kozma, Gábor AU - Kónya, Zoltán AU - Hodúr, Cecilia TI - Binary Adsorption by Bio-Adsorbents T2 - BOOK OF ABSTRACTS VIII INTERNATIONAL CONFERENCE SUSTAINABLE POSTHARVEST AND FOOD TECHNOLOGIES AND XXXV SCIENTIFIC - PROFESSIONAL CONFERENCE PROCESSING AND ENERGY IN AGRICULTURE PB - National Society of Processing and Energy in Agriculture CY - Novi Sad SN - 9788675205814 PY - 2023 SP - 130 UR - https://m2.mtmt.hu/api/publication/34191007 ID - 34191007 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 -