TY - JOUR AU - Gál, Márton AU - Samaniego Andrade, Samantha Kathiuska AU - Fehér, Anna Éva AU - Farkas, Attila AU - Madarász, János AU - Horváth, Lili AU - Gordon, Péter AU - Kovács, Róbert Sándor AU - Nagyné László, Krisztina TI - Thermal diffusity in copper benzene-1,3,5-tricarboxylate–reduced graphite oxide mechanical composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 13 SN - 1388-6150 DO - 10.1007/s10973-024-13021-x UR - https://m2.mtmt.hu/api/publication/34772009 ID - 34772009 N1 - Funding Agency and Grant Number: Nemzeti Kutatsi Fejlesztsi s Innovcis Hivatal [2020-3.1.1-ZFR-KVG-2020-00006]; National Research, Development and Innovation Fund of Hungary [2020-3.1.2-ZFR-KVG]; Hungarian grants [OTKA K143571, FK134277, TKP-6-6/PALY-2021]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP2021-NVA]; Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA); Stipendium Hungaricum scholarship program of the Hungarian Government Funding text: We extend our warm thanks to G. Bosznai (BME) for the invaluable technical assistance. This work was performed in the frame of the 2020-3.1.1-ZFR-KVG-2020-00006 project, implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the 2020-3.1.2-ZFR-KVG funding scheme. This research was also funded by the Hungarian grants OTKA K143571 and FK134277. The research is part of project no Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. The research was also funded by the Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA). SKSA is grateful to the Stipendium Hungaricum scholarship program of the Hungarian Government. AB - Metal organic frameworks (MOFs) and particularly copper benzene-1,3,5-tricarboxylate (HKUST-1) are excellent materials for gas storage (e.g., CH 4 , N 2 , H 2 adsorption) and gas separation. In this work, reduced graphene oxide (RGO)–HKUST-1 mechanical mixtures were studied in order to reveal the effect of RGO content on the pressure tolerance of the texture and heat conductivity. HKUST-1 was obtained by two different synthesis routes. Air-dried MOF and RGO were thoroughly mixed prior to the compression. Powder XRD and Raman spectroscopy were used to characterize the response of the crystal structure, while low-temperature nitrogen adsorption was used the follow the adsorption properties of the pellets. Finally, the "flash" heat pulse method was used to assess the thermal properties. The gas adsorption isotherms revealed that the adsorption capacity decreases when RGO is added. Based on Raman and XRD results, we found that the synthesis route has an effect on multiple scales. We experimentally confirmed that evaluation of the thermal diffusivity requires a model more complex than the simple Fourier equation, due to the inherent heterogeneous structure of the material. A good approximation of the Fourier coefficient of thermal diffusivity was obtained using the parameters of the Guyer–Krumhansl equation. The heat pulse experiments also revealed possible size-dependent behavior. LA - English DB - MTMT ER - TY - JOUR AU - Chen, Y. AU - Xu, B. AU - Nagyné László, Krisztina AU - Wang, Y. TI - Electrocatalytic nitrate reduction: The synthesis, recovery and upgradation of ammonia JF - JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING J2 - J ENVIRON CHEM ENG VL - 12 PY - 2024 IS - 2 PG - 21 SN - 2213-3437 DO - 10.1016/j.jece.2024.112348 UR - https://m2.mtmt.hu/api/publication/34742503 ID - 34742503 N1 - State Key Laboratory of Pollution Control and Resources Reuse (Tongji University), College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Budapest, H-1521, Hungary Export Date: 18 March 2024 Correspondence Address: Xu, B.; State Key Laboratory of Pollution Control and Resources Reuse (Tongii University), China; email: xubincheng012@163.com Funding details: 22230712800 Funding details: National Natural Science Foundation of China, NSFC, 22074104, 22276138 Funding details: Fundamental Research Funds for the Central Universities, 2022-4-ZD-07 Funding text 1: This work was supported by the National Natural Science Foundation of China (NSFC, No. 22276138 , 22074104 ), Research Project supported by Shanghai Municipal Committee of Science and Technology ( 22230712800 ) and the Fundamental Research Funds for the Central Universities ( 2022-4-ZD-07 ). AB - The nitrogen cycle has been disrupted by human activities, and a large amount of nitrate pollutants was discharged into the environment. This has resulted in an increase in nitrate levels in groundwater, posing threats to aquatic ecosystems and human health. Electrocatalytic nitrate reduction to ammonia (NRA), as an eco-friendly technology with the potential for pollution removal and resource recycling, has been widely studied. Here, focusing on the pathway of electrocatalytic nitrate reduction to achieve turning waste into valuable resources, we provide an overview of NRA from a broader perspective. The mechanisms of NRA, various electrocatalyst design strategies, and the control of reaction conditions have all been discussed in depth. Special attention is dedicated to summarizing the process of simultaneous ammonia recovery. Meanwhile, we discussed some emerging technologies developed based on NRA, such as C-N coupling and nitrate batteries. Finally, we discussed the challenges of NRA for industrial applications. This review provides a broader and comprehensive perspective on NRA, aiming to offer guidance for the catalyst design and practical application of NRA and promote the development of sustainable chemistry. © 2024 Elsevier Ltd LA - English DB - MTMT ER - TY - JOUR AU - Rácz, Anita AU - Nagyné László, Krisztina AU - Klébert, Szilvia TI - Qualitative and quantitative chemometric modelling of nanostructured carbon samples based on infrared spectroscopy JF - CARBON J2 - CARBON VL - 218 PY - 2024 PG - 7 SN - 0008-6223 DO - 10.1016/j.carbon.2023.118743 UR - https://m2.mtmt.hu/api/publication/34448239 ID - 34448239 N1 - Plasma Chemistry Research Group, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok Krt. 2, Budapest, H-1117, Hungary Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, 1521, Hungary Export Date: 19 January 2024 CODEN: CRBNA Correspondence Address: Rácz, A.; Plasma Chemistry Research Group, Magyar Tudósok Krt. 2, Hungary; email: racz.anita@ttk.hu Correspondence Address: László, K.; Department of Physical Chemistry and Materials Science, Hungary; email: laszlo.krisztina@vbk.bme.hu Funding details: Hungarian Scientific Research Fund, OTKA, K 134260, K 143571, PD 134416 Funding details: Magyar Tudományos Akadémia, MTA Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: The work was supported by project no. OTKA K 134260 , K 143571 and PD 134416 of the Ministry of Innovation and Technology of Hungary from the National Research, Development, and Innovation Fund , financed under the K and PD type funding scheme , respectively. The work was supported by the Hungarian Academy of Sciences: János Bolyai Research Scholarship . The work was supported by the ÚNKP-23-5 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund . LA - English DB - MTMT ER - TY - JOUR AU - Kállay-Menyhárd, Alfréd AU - Renkeczné Tátraaljai, Dóra AU - Pukánszky, Béla Jr. AU - Nagyné László, Krisztina AU - Bulátkó, Anna AU - Nagyné Albert, Emőke AU - Tegze, Borbála Ágnes AU - Márton, Péter AU - Hórvölgyi, Zoltán AU - Gyarmati, Benjámin Sándor AU - Szilágyi, András Ferenc AU - Hessz, Dóra AU - Kubinyi, Miklós AU - Kállay, Mihály TI - Kutatómunka a Fizikai Kémia és Anyagtudományi Tanszéken JF - MAGYAR KÉMIKUSOK LAPJA J2 - MAGY KEM LAP VL - 78 PY - 2023 IS - 12 SP - 370 EP - 375 PG - 6 SN - 0025-0163 UR - https://m2.mtmt.hu/api/publication/34452555 ID - 34452555 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Németh, Imre AU - Nagyné László, Krisztina AU - Bulátkó, Anna AU - Vaszita, Emese Júlia AU - Molnár, Mónika TI - Ecotoxicity Assessment of Graphene Oxides Using Test Organisms from Three Hierarchical Trophic Levels to Evaluate Their Potential Environmental Risk JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 13 PY - 2023 IS - 21 SN - 2079-4991 DO - 10.3390/nano13212858 UR - https://m2.mtmt.hu/api/publication/34394607 ID - 34394607 N1 - Department of Applied Biotechnology and Food Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 22 November 2023 Correspondence Address: Molnár, M.; Department of Applied Biotechnology and Food Science, Hungary; email: molnar.monika@vbk.bme.hu Funding details: K128410, K143571 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI, TKP2021-EGA-02 Funding text 1: This research was funded by the Hungarian National Scientific Research Programmes (NRDI K128410 and K143571) and the Hungarian National Research, Development and Innovation Office Fund under the framework of the TKP2021-EGA-02. AB - After more than a decade of studying the ecotoxicity of graphene oxide nanomaterials (nGOs), it has been concluded that there is limited information available regarding the environmental risk of graphene-based materials. Since existing ecotoxicological studies of nanomaterials have produced contradictory results, it is recommended that case-by-case studies should be conducted to evaluate their effects. This can be carried out by employing several methods, testing species from different trophic levels, and conducting community studies. Our goal was to evaluate the toxicity effects of two GOs (AF 96/97 and PM 995) derived from different graphite precursors on various test organisms from diverse trophic levels (bacteria, protozoa, a freshwater microbial community, plants, and invertebrate animals) in aquatic environments. We compared the effects of both nGO types and estimated the predicted no-effect environmental concentration (PNEC) values to determine their potential environmental risk. Our findings demonstrated the need for a complex ecotoxicity toolkit since the ecotoxicity results varied based on the test organism, the selected endpoints, and the test method used. Additionally, we found that toxicity effects were dependent on the concentration and characteristics of the specific nGO type used, as well as the exposure time. We estimated the PNEC values for GO AF 96/97 and GO PM 995 in the aquatic compartment to be 8 ng/L and 4 ng/L, respectively. Even after applying the worst-case scenario approach, the tested nGOs pose no environmental risk. LA - English DB - MTMT ER - TY - JOUR AU - Fekete-Kertész, Ildikó AU - Nagyné László, Krisztina AU - Molnár, Mónika TI - Towards Understanding the Factors behind the Limited Integration of Multispecies Ecotoxicity Assessment in Environmental Risk Characterisation of Graphene Family Materials - A Bibliometric Review JF - C: JOURNAL OF CARBON RESEARCH J2 - C-J CARBON RES VL - 9 PY - 2023 IS - 4 PG - 18 SN - 2311-5629 DO - 10.3390/c9040090 UR - https://m2.mtmt.hu/api/publication/34152622 ID - 34152622 N1 - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation Office Fund [OTKA_K_128410, OTKA_K_143571, TKP2021-EGA-02] Funding text: The financial support for the research is greatly acknowledged to the Hungarian National Research, Development and Innovation Office Fund in the frame of the OTKA_K_128410, OTKA_K_143571 Research and TKP2021-EGA-02 Projects. LA - English DB - MTMT ER - TY - JOUR AU - Samaniego Andrade, Samantha Kathiuska AU - SHIVA SHANKAR, LAKSHMI AU - Bakos, István AU - Klébert, Szilvia AU - Kun, Róbert AU - Mohai, Miklós AU - Nagy, Balázs AU - Nagyné László, Krisztina TI - The Influence of Reduced Graphene Oxide on the Texture and Chemistry of N,S-Doped Porous Carbon. Implications for Electrocatalytic and Energy Storage Applications JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 13 PY - 2023 IS - 16 PG - 22 SN - 2079-4991 DO - 10.3390/nano13162364 UR - https://m2.mtmt.hu/api/publication/34106212 ID - 34106212 N1 - Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, 1521, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary Department of Chemical and Environmental Process Engineering, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, 1521, Hungary H-Ion Research, Development and Innovation Ltd, Konkoly-Thege út 29-33, Budapest, 1121, Hungary Export Date: 4 September 2023 Correspondence Address: László, K.; Department of Physical Chemistry and Materials Science, Hungary; email: laszlo.krisztina@vbk.bme.hu AB - In this work, we study the influence of reduced graphene oxide (rGO) on the morphology and chemistry of highly porous N,S-doped carbon cryogels. Simultaneously, we propose an easily upscalable route to prepare such carbons by adding graphene oxide (GO) in as-received suspended form to the aqueous solution of the ι-carrageenan and urea precursors. First, 1.25–5 wt% GO was incorporated into the dual-doped polymer matrix. The CO2, CO, and H2O emitted during the thermal treatments resulted in the multifaceted modification of the textural and chemical properties of the porous carbon. This facilitated the formation of micropores through self-activation and resulted in a substantial increase in the apparent surface area (up to 1780 m2/g) and pore volume (up to 1.72 cm3/g). However, adding 5 wt% GO led to overactivation. The incorporated rGO has an ordering effect on the carbon matrix. The evolving oxidative species influence the surface chemistry in a complex way, but sufficient N and S atoms (ca. 4 and >1 at%, respectively) were preserved in addition to the large number of developing defects. Despite the complexity of the textural and chemical changes, rGO increased the electrical conductivity monotonically. In alkaline oxygen reduction reaction (ORR) tests, the sample with 1.25 wt% GO exhibited a 4e− mechanism and reasonable stability, but a higher rGO content gradually compromised the performance of the electrodes. The sample containing 5 wt% GO was the most sensitive under oxidative conditions, but after stabilization it exhibited the highest gravimetric capacitance. In Li-ion battery tests, the coulombic efficiency of all the samples was consistently above 98%, indicating the high potential of these carbons for efficient Li-ion insertion and reinsertion during the charge–discharge process, thereby providing a promising alternative for graphite-based anodes. The cell from the 1.25 wt% GO sample showed an initial discharge capacity of 313 mAh/g, 95.1% capacity retention, and 99.3% coulombic efficiency after 50 charge–discharge cycles. LA - English DB - MTMT ER - TY - JOUR AU - Farah, Shereen Farah Ahmed AU - Gyarmati, Benjámin Sándor AU - Madarász, János AU - Villar-Rodil, S. AU - Tascón, J.M.D. AU - Nagyné László, Krisztina TI - Heterogenity of graphite oxide particles obtained with wet oxidative exfoliation JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 386 PY - 2023 SN - 0167-7322 DO - 10.1016/j.molliq.2023.122451 UR - https://m2.mtmt.hu/api/publication/34094261 ID - 34094261 N1 - Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, H-1111, Hungary Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, H-1111, Hungary Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco. Pintado Fe 26, Oviedo, 33011, Spain Export Date: 14 August 2023 CODEN: JMLID Correspondence Address: László, K.; Department of Physical Chemistry and Materials Science, Műegyetem Rkp. 3, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Samaniego Andrade, Samantha Kathiuska AU - Kállay-Menyhárd, Alfréd AU - Klébert, Szilvia AU - Mohai, Miklós AU - Nagy, Balázs AU - Nagyné László, Krisztina TI - Effect of Carbon Nanoparticles on the Porous Texture of ι-Carrageenan-Based N-Doped Nanostructured Porous Carbons and Implications for Gas Phase Applications JF - C: JOURNAL OF CARBON RESEARCH J2 - C-J CARBON RES VL - 9 PY - 2023 IS - 3 PG - 16 SN - 2311-5629 DO - 10.3390/c9030068 UR - https://m2.mtmt.hu/api/publication/34065321 ID - 34065321 N1 - Funding Agency and Grant Number: We extend our warm thanks to A. Farkas for his invaluable assistance in Raman spectroscopy and to G. Bosznai for his technical assistance. Funding text: We extend our warm thanks to A. Farkas for his invaluable assistance in Raman spectroscopy and to G. Bosznai for his technical assistance. AB - S and N double-doped high surface area biomass-derived carbons were obtained from marine biomass-derived ι-carrageenan. Adding carbon nanoparticles (CNPs), namely graphene oxide (GO) or carbon nanotubes (CNTs), in the early stage of the synthesis leads to a modified porous texture and surface chemistry. The porous textures were characterized by N2 (−196.15 °C) and CO2 (0 °C) isotherms. The best GO- and CNT-added carbons had an apparent surface area of 1780 m2/g and 1170 m2/g, respectively, compared to 1070 m2/g for the CNP-free matrix. Analysis of the Raman spectra revealed that CNT was more efficient in introducing new defects than GO. Based on XPS, the carbon samples contain 2–4.5 at% nitrogen and 1.1 at% sulfur. The Dubinin–Radushkevich (DR) and Henry models were used to assess the strength of the interactions between various gases and the surface. The N2/H2 and CO2/CH4 selectivities were estimated with ideal adsorbed solution theory (IAST). While the CNPs, particularly GO, had a remarkable influence on the porous texture and affected the surface chemistry, their influence on the separation selectivity of these gases was more modest. LA - English DB - MTMT ER - TY - JOUR AU - Szilágyi, Barnabás Áron AU - Gyarmati, Benjámin Sándor AU - L. Kiss, Eszter AU - Budai-Szűcs, Mária AU - Misra, Anil AU - Csányi, Erzsébet AU - Nagyné László, Krisztina AU - Szilágyi, András Ferenc TI - In situ gelation of thiolated poly(aspartic acid) derivatives through oxidant-free disulfide formation for ophthalmic drug delivery JF - COLLOIDS AND SURFACES B: BIOINTERFACES J2 - COLLOID SURFACE B VL - 225 PY - 2023 PG - 10 SN - 0927-7765 DO - 10.1016/j.colsurfb.2023.113254 UR - https://m2.mtmt.hu/api/publication/33734502 ID - 33734502 N1 - Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary Institute of Pharmaceutical Technology and Regulatory Affairs, Faculty of Pharmacy, University of Szeged, Eötvös u. 6, Szeged, H-6720, Hungary Pharmidex Pharmaceutical Services, Office 3.05, 1 King Street, London, EC2V 8AU, United Kingdom CODEN: CSBBE Correspondence Address: Szilágyi, A.; Department of Physical Chemistry and Materials Science, Műegyetem rkp. 3, Hungary; email: szilagyi.andras@vbk.bme.hu LA - English DB - MTMT ER -