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 - TY - JOUR AU - Sisay, Elias Jigar AU - Fazekas, Ákos Ferenc AU - Gyulavári, Tamás AU - Heszlerné Kopniczky, Judit AU - Hopp, Béla AU - Veréb, Gábor AU - László, Zsuzsanna TI - Investigation of Photocatalytic PVDF Membranes Containing Inorganic Nanoparticles for Model Dairy Wastewater Treatment JF - MEMBRANES (BASEL) J2 - MEMBRANES-BASEL VL - 13 PY - 2023 IS - 7 PG - 21 SN - 2077-0375 DO - 10.3390/membranes13070656 UR - https://m2.mtmt.hu/api/publication/34059475 ID - 34059475 AB - Membrane separation processes are promising methods for wastewater treatment. Membrane fouling limits their wider use; however, this may be mitigated using photocatalytic composite materials for membrane preparation. This study aimed to investigate photocatalytic polyvinylidene fluoride (PVDF)-based nanocomposite membranes for treating model dairy wastewater containing bovine serum albumin (BSA). Membranes were fabricated via physical coating (with TiO2, and/or carbon nanotubes, and/or BiVO4) and blending (with TiO2). Another objective of this study was to compare membranes of identical compositions fabricated using different techniques, and to examine how various TiO2 concentrations affect the antifouling and cleaning performances of the blended membranes. Filtration experiments were performed using a dead-end cell. Filtration resistances, BSA rejection, and photocatalytic cleanability (characterized by flux recovery ratio (FRR)) were measured. The surface characteristics (SEM, EDX), roughness (measured by atomic force microscopy, AFM), wettability (contact angle measurements), and zeta potential of the membranes were also examined. Coated PVDF membranes showed higher hydrophilicity than the pristine PVDF membrane, as evidenced by a decreased contact angle, but the higher hydrophilicity did not result in higher fluxes, unlike the case of blended membranes. The increased surface roughness resulted in increased reversible fouling, but decreased BSA retention. Furthermore, the TiO2-coated membranes had a better flux recovery ratio (FRR, 97%) than the TiO2-blended membranes (35%). However, the TiO2-coated membrane had larger total filtration resistances and a lower water flux than the commercial pristine PVDF membrane and TiO2-blended membrane, which may be due to pore blockage or an additional coating layer formed by the nanoparticles. The BSA rejection of the TiO2-coated membrane was lower than that of the commercial pristine PVDF membrane. In contrast, the TiO2-blended membranes showed lower resistance than the pristine PVDF membrane, and exhibited better antifouling performance, superior flux, and comparable BSA rejection. Increasing the TiO2 content of the TiO2-blended membranes (from 1 to 2.5%) resulted in increased antifouling and comparable BSA rejection (more than 95%). However, the effect of TiO2 concentration on flux recovery was negligible. LA - English DB - MTMT ER -