Article
Environmental Sciences
Hao Hou, Shichu Xu, Suyan Ding, Weijie Lin, Qiang Yu, Jia Zhang, Guangren Qian
Summary: This study successfully synthesized spinel catalyst from electroplating sludge and utilized the transition metals and multi-hetero atoms for CO2 catalytic hydrogenation to produce CH3OH. Metal doping increased the CO2 conversion efficiency but decreased the CH3OH selectivity. Further doping of S significantly increased the CH3OH selectivity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Fabio E. Furcas, Barbara Lothenbach, Shishir Mundra, Camelia N. Borca, Cristhiana Carine Albert, O. Burkan Isgor, Thomas Huthwelker, Ueli M. Angst
Summary: The transformation of 2-line ferrihydrite to goethite in alkaline solutions was studied, and the results showed that the transformation rate increased significantly at higher pH levels. The analysis presented in this study can be used to estimate the transformation rate of 2-line ferrihydrite in various aqueous electrolytes and the formation of corrosion products in cementitious pore solutions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mehdi Bejaoui, Abdelhakim Elmhamdi, Laura Pascual, Patricia Perez-Bailac, Kais Nahdi, Arturo Martinez-Arias
Summary: The catalytic performance of CoFe2O4 prepared by sol-gel for preferential CO oxidation in a H-2-rich stream was examined, as well as the promoting effects of incorporation of Ce, Co, Cu, and Zr by impregnation on the process. Surface modifications induced in CoFe2O4 upon introduction of the metals hinder a low temperature CO oxidation process but enhance activity above 125 degrees C, with copper-containing catalyst showing methanation activity due to favored reduced states of cobalt.
Article
Materials Science, Ceramics
Linh T. Tr Nguyen, Khanh D. M. Nguyen, Tien A. Nguyen, Kwangsoo No
Summary: The study explored the synthesis of Zinc ferrite nanomaterial through co-precipitation method and the importance of pH in achieving pure ZnFe2O4 spinel structure. Results showed that within a pH range of 7 to 12, a single-phase spinel ferrite structure was obtained, while deviations in pH at 6 and 13 led to the appearance of unwanted phases in the product, reflecting an incomplete stoichiometric ratio.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Abhishek Kumar, Krunal M. Gangawane
Summary: This work investigates the effect of four different precipitating agents on the structural and magnetic properties of synthesized ferromagnetic nanoparticles. The results show that NH3 in an alcohol solution as a precipitating agent exhibits higher magnetic properties but a longer response time. On the other hand, NaOH in an aqueous solution provides a shorter reaction time and lower cost, but the particle surface and magnetic characteristics are inferior.
Article
Engineering, Environmental
Thongthai Witoon, Vittawin Lapkeatseree, Thanapha Numpilai, Chin Kui Cheng, Jumras Limtrakul
Summary: The preparation methods have a significant impact on the physicochemical properties and catalytic performance of the catalysts, with the C3 catalyst showing the highest yield of light olefins at 350 degrees Celsius and 20 bar, attributed to the reduction of weak H-2 adsorption and maintenance of high CO2 adsorption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Optics
M. G. Kotresh, M. K. Patil, S. R. Inamdar
Summary: ZnO nanoparticles were successfully synthesized using the co-precipitation method at two different reaction temperatures, resulting in good quality nanoparticles with some minor impurities. The average crystalline sizes were obtained using theoretical methods, and the nanoparticles showed broad absorption, narrower emission spectrum, and wide energy bandgap, making them suitable for potential applications in optoelectronic devices and biosensors.
Article
Chemistry, Physical
Qiangqiang Xu, Xingqin Xu, Guoli Fan, Lan Yang, Feng Li
Summary: This study successfully synthesized a series of uniform K-containing ZnCoxFe2-xO4 nanoparticles and demonstrated their outstanding performance in the hydrogenation of CO2 to produce light olefins. The findings offer clear insights into the Fe-Co interactions over ternary ZnCoxFe2-xO4 catalysts for highly efficient CO2 conversion.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Yanqiu Wang, Dengdeng Wu, Tangkang Liu, Guoliang Liu, Xinlin Hong
Summary: The use of supported Pd catalysts with PdZn alloy on ZnO-enriched support is an effective strategy for efficient CO2 hydrogenation to methanol. The amount of formed PdZn alloy and catalyst structure influenced by ZnO concentration on ZnFe2O4 were explored to obtain the best Pd-Z(1)FO catalyst, achieving high methanol space-time yield (STY).
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Physics, Condensed Matter
John Abel Martin Mark, Archana Venkatachalam, A. Pramothkumar, N. Senthilkumar, K. Jothivenkatachalam, Joseph Prince Jesuraj
Summary: Tetragonal spinel Cobalt manganite nanoparticles were successfully prepared via co-precipitation route, with crystal structure and phase purity confirmed by PXRD and optical band gap measured at 1.70 and 2.0 eV. Morphological analysis was conducted using SEM images, with elemental composition determined by EDX spectrum. FTIR and PL spectrum provided information on functional groups and crystal defects, while magnetic properties were analyzed with VSM. Photocatalytic activity against organic dyes under direct sunlight showed degradation efficiencies of 87.80%, 79.43%, and 52.78% for MG, MB, and CR dyes respectively.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Junghwan Lee, Young-Woong Song, HyoChan Lee, Min-Young Kim, Jinsub Lim
Summary: A new LNMO material with an octahedral structure and high specific surface area was synthesized using the Taylor-Couette flow-based co-precipitation method. Compared with commercially available materials, the LNMO cathode material showed less structural distortion and cation mixing, as well as higher cyclability and rate performance.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Gabor Varga, Imre Szenti, Janos Kiss, Kornelia Baan, Gyula Halasi, Laszlo Ovari, Akos Szamosvolgyi, Robert Mucsi, Erzsebet Dodony, Zsolt Fogarassy, Bela Pecz, Luca Olivi, Andras Sapi, Akos Kukovecz, Zoltan Konya
Summary: Thermo-catalytic bio-SNG production is an important tool for converting waste to gaseous fuels. Bimetallic systems based on transition metals show promise as efficient and cost-effective catalysts. By fine-tuning the surface composition of the bimetallic systems, selective methane production can be achieved. The hydrogenation of active carbon is found to be the key step for methane production.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Polymer Science
Pooja Dhiman, Garima Rana, Amit Kumar, Gaurav Sharma
Summary: The widespread use of organic dyes in wastewater is a major environmental concern. The UV-Visible light driven photocatalytic environmental purification is a highly promising field for wastewater treatment. In this study, cobalt doped Mg-Zn nanoferrites were successfully synthesized using an economical combustion process. The Z5C1 catalyst exhibited high efficiency in degrading crystal violet dye under UV-Visible light, attributed to low charge carrier recombination rate and moderate band gap.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kaiyang Li, Yimin Zeng, Jing-Li Luo
Summary: The study found that adding 100 ppm H2O significantly increased oxidation reactions in supercritical CO2, while the presence of O2 led to the opposite tendency. Alloy 740 showed better resistance to carburization and exhibited good corrosion resistance in the supercritical CO2 environment when compared to SS310.
Article
Chemistry, Inorganic & Nuclear
M. Kamran, Yasir Abbas, M. Anis-ur-Rehman
Summary: Ce3+ and La3+ co-substituted cobalt ferrites were synthesized by co-precipitation method and their structural, dielectric, AC electrical properties, impedance spectroscopy and DC electrical measurements were investigated. X-ray diffraction analysis confirmed the desired single-phased spinel cubic lattice structure. The lattice constant increased while the crystallite size decreased with rare earth substitution. The frequency dependent dielectric measurements exhibited a dispersive behavior at low frequency and remained frequency-independent at high frequency. The AC conductivity increased with increasing frequency and was explained by Jonscher's power law. The impedance spectra showed a dielectric relaxation phenomenon and the grain-boundaries played a dominant role in the dielectric response, as confirmed by Nyquist plots. The temperature dependent DC resistivity increased with the addition of Ce3+ and La3+, indicating a semiconducting nature.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Timea Benko, Shaohua Shen, Miklos Nemeth, Jinzhan Su, Akos Szamosvolgyi, Zoltan Kovacs, Gyorgy Safran, Sahir M. Al-Zuraiji, Endre Zsolt Horvath, Andras Sapi, Zoltan Konya, Jozsef Sandor Pap
Summary: Photoelectrochemical water splitting can be more efficient by grafting co-catalysts on semiconductors. We used a non-noble metal pre-catalyst, [FeII(PBI)(3)](2+), on a nanopyramidal BiVO4 semiconductor to improve its performance and charge transfer efficiency.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Mohit Yadav, Imre Szenti, Marietta Abel, Akos Szamosvolgyi, Korneli B. Abrahamne, Janos Kiss, Pap Zsolt, Andras Sapi, Akos Kukovecz, Zoltan Konya
Summary: This study successfully synthesized platinum-gallium nanoalloy catalyst via ultrasound-assisted impregnation method, which exhibited excellent catalytic activity and H-2 formation rate in the steam reforming of ethanol reaction. This is attributed to the high interaction between gallium and platinum, resulting in enhanced dehydrogenation and acidic properties, thus increasing the yield of H-2.
Article
Chemistry, Physical
Adel Szerlauth, Zsuzsanna D. Konya, Greta Papp, Zoltan Konya, Akos Kukovecz, Marton Szabados, Gabor Varga, Istvan Szilagyi
Summary: The immobilization of tannic acid (TA) and glutathione (GSH) in layered double hydroxide (LDH) nanoparticles as hosts has been investigated. The molecular orientation of TA and GSH on the surface or among the layers of LDHs was found to strongly affect their radical scavenging activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Marton Szabados, Tamara Szabados, Robert Mucsi, Andras Sapi, Zoltan Konya, Akos Kukovecz, Istvan Palinko, Pal Sipos
Summary: A simple synthetic route was developed to prepare NiAl4-layered double hydroxides (LDHs) with different interlamellar anions, which showed potential catalytic activity in CO2 hydrogenation reaction.
MATERIALS RESEARCH BULLETIN
(2023)
Correction
Chemistry, Physical
Owais Al-Aqtash, Ferenc Farkas, Andras Sapi, Imre Szenti, Tamas Boldizsar, Kornelia B. Abrahamne, Akos Kukovecz, Zoltan Konya
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Materials Science, Ceramics
Tamas Boldizsar, Henrik Bali, Imre Szenti, Imre Sebok-Papp, Zsolt Ban, Sara Herczeg, Gabor Barna, Andras Sapi, Akos Kukovecz, Zoltan Konya
Summary: In this study, lightweight cordierite-mullite ceramics with high strength and high thermal-shock resistance were successfully synthesized using hollow ceramic microspheres. The resulting cordierite material had a low bulk density of 1.40 g/cm3, apparent porosity of 44.78%, flexural strength of 20.17 MPa, and coefficient of thermal expansion of 2.26 x 10-6 oC-1, compared to the bulk counterpart with a bulk density of 2.00 g/cm3, apparent porosity of 25.75%, flexural strength of 23.69 MPa, and coefficient of thermal expansion of 2.47 x 10-6 oC-1. As a catalyst support, the economical cordierite showed the same stability and activity in CO2 hydrogenation towards C5+ fuels as the bulk cordierite-based catalyst counterparts.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Green & Sustainable Science & Technology
Samrand Saeidi, Andras Sapt, Asif Hussain Khoja, Sara Najari, Mariam Ayesha, Zoltan Konya, Bernard Baffour Asare-Bediako, Adam Tatarczuk, Volker Hessel, Frerich J. Keil, Alirio E. Rodrigues
Summary: Fossil fuel depletion, global warming, climate change, and rising fuel prices have prompted scientists to explore hydrogen as a commercial and environmentally friendly energy carrier. Steam methane reforming (SMR) is currently the most effective method for hydrogen production, but it faces challenges such as catalyst deactivation, coking, and CO2 generation. This article comprehensively reviews the influence of catalyst types, kinetic models, and operating conditions on high-yield H-2 production through conventional SMR, discusses intensified techniques for SMR to blue H-2, and proposes a novel and sustainable path for the SMR process to produce turquoise H-2 using new materials and emerging technologies. Additionally, the article discusses the critical points of steam reforming process technology to enhance environmental, social, and governance (ESG) profiling.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Ibolya Zita Papp, Adel Szerlauth, Timea Szucs, Peter Belteky, Juan Fernando Gomez Perez, Zoltan Konya, Akos Kukovecz
Summary: Hybrid thin film sensors based on semiconductor oxides and carbon nanostructures were fabricated and characterized in this study. The hybrid layer, consisting of ZnO nanoparticles, milled multiwalled carbon nanotubes, and conducting polymer, showed enhanced performance in gas sensing tests and as an ultraviolet photodetector. The results suggest the potential usability of this composite in further sensor applications.
Article
Materials Science, Multidisciplinary
Livia Vasarhelyi, Daniel Sebok, Imre Szenti, Adam Toth, Sara Levay, Robert Vajtai, Zoltan Konya, Akos Kukovecz
Summary: Mixing is a fundamental process in practically every industry, but there is a lack of literature on its 3D analysis. High-resolution computed tomography (micro-CT) is an ideal X-ray imaging tool for investigating the mixing of granular materials. In addition to qualitative analysis, 3D micro-CT images provide an opportunity for quantitative analysis, which is crucial for the efficiency and environmental impact of the mixing process. This study proposes lacunarity as a measure of mixing, which allows for a temporal description of mixing in three dimensions. The lacunarity curve provides additional information about the spatial distribution of grains compared to traditional mixing indices. Discrete element method simulations showed similar results to the experiments.
OXFORD OPEN MATERIALS SCIENCE
(2023)
Article
Biochemical Research Methods
Sanja Mutic, Dalibor Stankovic, Zoltan Konya, Jasmina Anojcic
Summary: A cholesterol biosensor (Naf/ChOx/Pt,Ru-C/IL-CPE) was developed by immobilizing cholesterol oxidase (ChOx) on Pt,Ru-C nanocomposite and an ionic liquid (IL)-modified carbon paste electrode (CPE) using Nafion (R) (Naf). The biosensor showed excellent analytical performance for cholesterol amperometric determination in phosphate buffer solution pH 7.50. Under optimized conditions, the biosensor exhibited a linear relationship between oxidation current and cholesterol concentration, with a detection limit of 0.13 mu M and low relative standard deviation (RSD). The biosensor also demonstrated good repeatability and high selectivity for cholesterol biosensing in human blood serum samples, making it a promising alternative to existing commercial cholesterol tests used in medical practice.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Krisztina Karadi, Thanh-Truc Nguyen, Adel Anna Adam, Kornelia Baan, Andras Sapi, Akos Kukovecz, Zoltan Konya, Pal Sipos, Istvan Palinko, Gabor Varga
Summary: Glucose-to-fructose isomerization is a key process in biomass conversion to fine chemicals. Catalyzing glucose isomerization in ethanol using hydrotalcite has shown promising results. The study reveals the relationship between the structural and textural parameters of hydrotalcites and their catalytic performance, indicating that hydrophilicity and LDH surface factors are the determining factors. A comparable catalytic performance with lower reaction temperature can be achieved using easily recyclable LDH with suitable surface features.
Article
Chemistry, Physical
Marianna Kocsis, Kornelia Baan, Sandor B. Otvos, Akos Kukovecz, Zoltan Konya, Pal Sipos, Istvan Palinko, Gabor Varga
Summary: Oxidative dehydrogenative coupling (ODC) is a versatile and sustainable tool for forming new C-C, C-O, and N=N bonds. However, it is less explored for N-heterocycle synthesis. In this study, we developed an environmentally friendly synthesis strategy to selectively produce azobenzenes, quinolines, and quinoxalines through the ODC of anilines and 2-aminoanilies with vicinal diols. The reactions were catalyzed by bifunctional catalysts based on transition metal oxides/Bi(iii), enabling solvent-, additive-, oxidant-, and base-free cyclizations/couplings. The catalysts showed high robustness and reusability.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Mohit Yadav, Tamas Gyulavari, Janos Kiss, Kornelia B. Abrahamne, Anastasiia Efremova, Akos Szamosvolgyi, Zsolt Pap, Andras Sapi, Akos Kukovecz, Zoltan Konya
Summary: The activation and conversion of CO2 can be achieved on multifunctional catalytic sites at the metal/oxide interface by taking advantage of the synergy between noble metal nanoparticles and supports. Sequential deposition of noble metals and nanodiamonds enhances light absorption properties and photocatalytic activity.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Environmental Sciences
Natasa Slijepcevic, Dunja Radenovic, Jelena Beljin, Gabor Kozma, Zoltan Konya, Snezana Maletic, Dragana Tomasevic Pilipovic
Summary: This study demonstrates the potential of green nano-zero-valent iron supported by native clay and biochar for the simultaneous removal of potentially toxic elements and polycyclic aromatic hydrocarbons from co-contaminated river sediment. It shows promising results in the removal of both organic and inorganic pollutants, with no further impact on the environment.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Meeting Abstract
Immunology
Maria Harmati, Matyas Bukva, Gabriella Dobra, Edina Gyukity-Sebestyen, Timea Boroczky, Zoltan Szabo, Zoltan Konya, Peter Horvath, Almos Klekner, Krisztina Buzas
EUROPEAN JOURNAL OF IMMUNOLOGY
(2023)
