Article
Energy & Fuels
Norshakirah Ahmad Rashidi, Elnida Mustapha, Yeow Yean Theng, Noor Azira Abdul Razak, Najihah Abdul Bar, Khairul Basyar Baharudin, Darfizzi Derawi
Summary: Waste cooking oil is an attractive feedstock for producing advanced biofuels due to its low cost and abundant availability. This study focused on the synthesis and analysis of mesoporous bimetallic catalysts for the catalytic deoxygenation of waste cooking oil. The results showed that the catalyst with 10% Ni-Fe/SBA-15 had the highest liquid yield but low selectivity towards the diesel fraction, while the catalyst with 5% Ni-Co/SBA-15 had the highest selectivity towards the diesel fraction.
Article
Chemistry, Physical
Amanda Sfeir, Camila A. Teles, Carmen Ciotonea, G. N. Manjunatha Reddy, Maya Marinova, Jeremy Dhainaut, Axel Lofberg, Jean-Philippe Dacquin, Sebastien Royer, Said Laassiri
Summary: In this study, the catalytic activity of Co3Mo3N was improved by dispersing it into a high surface area silica-based support (SBA-15). SBA-15 demonstrated good thermal and chemical stability, and supported CoMo-N/SBA-15 catalysts exhibited enhanced catalytic activity in ammonia synthesis compared to the classical Co3Mo3N catalyst.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Applied
Tao Liu, Xiaoqiu Ju, Zhixin Hu, Rongrong Xie
Summary: The confinement effect of ordered mesoporous SiO2 was found to effectively inhibit the aggregation of CoOx, promoting the formation of Co(III) species and enhancing the catalytic activity for CO oxidation. Additionally, the pore size of the carrier SBA-15 played a significant role in the catalytic activity of CoOx.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Andreina Garcia, Maibelin Rosales, Minju Thomas, Giovanni Golemme
Summary: Versatile materials for oxidizing As(III) into less hazardous As(V) species have attracted increasing attention. Ti-SBA-15, prepared by coating 7% anatase TiO2 on pre-formed SBA-15, showed efficient adsorption and photo-oxidation of As(III) at different pHs. The presence of TiO2 on SBA-15 promoted reactive oxygen species generation, leading to successful oxidation of As(III). Despite covering only a small percentage of the surface, TiO2 exhibited unprecedented photocatalytic behavior, making it a prominent catalyst for arsenic removal from water.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Thanh Son Cam, Shamil Omarovich Omarov, Maria Igorevna Chebanenko, Anastasia Sergeevna Sklyarova, Vladimir Nikolaevich Nevedomskiy, Vadim Igorevich Popkov
Summary: In this study, a series of CuO/CeO2 nanocomposite catalysts were synthesized using the urea-nitrate combustion method, with different CuO loadings. The CuO loading significantly influenced the phase composition, crystallite size, specific surface area, and catalytic performance of the catalysts. Among them, CuO/CeO2-20 catalyst showed high catalytic activity and stability in CO oxidation at low reaction temperature. The synergistic effect of redox pairs and oxygen vacancies contributed to the enhanced catalytic activity of CuO/CeO2-20 catalyst. Further research on doping oxides of other rare-earth and transition metals may further improve the catalytic performance of CuO/CeO2-20 sample.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Agricultural Engineering
Gurmeet Singh, Tuhin S. Khan, Chanchal Samanta, Rajaram Bal, Ankur Bordoloi
Summary: 2-Pentanone has been successfully synthesized from biomass-derived furfural through simultaneous hydrodeoxygenation, ring-opening, and hydrogenation reactions over a bi-metallic Cu-Ni/SBA-15 catalyst in a fixed-bed continuous flow reactor. The catalyst exhibited high activity, selectivity, and stability, yielding 78% of 2-pentanone under mild reaction conditions for up to 20 hours.
BIOMASS & BIOENERGY
(2022)
Article
Chemistry, Physical
Jean-Luc Blin, Laure Michelin, Benedicte Lebeau, Anton Naydenov, Ralitsa Velinova, Hristo Kolev, Pierrick Gaudin, Loic Vidal, Anna Dotzeva, Krasimir Tenchev, Silviya Todorova
Summary: New data on the structural and catalytic properties of mono-component cobalt and bi-component Co-Ce catalysts supported on SBA-15 are reported. Performance evaluation was conducted through combustion tests of methane, propane, and n-hexane, showing different catalytic activity and reducibility among these catalysts.
Article
Green & Sustainable Science & Technology
P. Jain, M. Chimote, C. P. Vinod
Summary: Bimetallic nanoparticles with synergistic effects can enhance the catalytic activity, selectivity, and stability of solid materials. The study synthesized Au@Co core-shell bimetallic nanoparticles and demonstrated efficient and stable CO conversion in the FT reaction.
MATERIALS TODAY SUSTAINABILITY
(2021)
Article
Chemistry, Physical
Shuo Chen, Priscilla M. de Souza, Carmen Ciotonea, Maya Marinova, Franck Dumeignil, Sebastien Royer, Robert Wojcieszak
Summary: The main difficulty in the liquid phase furfural hydrogenation process is controlling the selectivity to the target product. A preparation method based on glycine-assisted in situ autocombustion is reported, leading to highly active, selective, and stable Cu supported catalysts. The resulting catalysts show exceptional features such as complete conversion of furfural and low loss of conversion and selectivity during recycling tests.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Multidisciplinary
Tao Liu, Tingting Jiang, Jinqi Zhu, Tingwei Rui, Shourong Zheng, Zhixin Hu
Summary: In this study, pure Co3O4 samples and confined catalysts were prepared and their catalytic activities were found to be influenced by morphology. The confinement effect of Co3O4 particles in a mesoporous material enhanced their catalytic performance by inhibiting particle aggregation and increasing the Co2+/Co3+ ratio.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Applied
Vahide Nuran Mutlu, Selahattin Yilmaz
Summary: The glycosidation of glucose with n-butanol was studied using sulphated Zr and tungstophosphoric acid incorporated SBA-15 catalysts, showing improved acidity and higher yields of butyl glucoside. The TPA-SBA-15 catalyst demonstrated the highest activity and selectivity, with stable and reusable performance. Further studies on reaction temperature and catalyst amount were conducted to optimize the reaction parameters.
Article
Chemistry, Physical
Jing Xu, Zonghui Liu, Yali Zhou, Rui Fu, Zhe Wen, Bing Yan, Bing Xue
Summary: The oxidation of biomass-derived alkyl lactate to alkyl pyruvate using VxOy/SBA-15 catalysts was studied. It was found that the conversion of ethyl lactate increased with the increase of vanadium loading, while the selectivity to ethyl pyruvate remained above 95%. The catalysts were characterized and their structure-activity relationships were analyzed, and a possible catalytic mechanism was proposed.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Fnu Gorky, Shelby R. Guthrie, Courtney S. Smoljan, James M. Crawford, Moises A. Carreon, Maria L. Carreon
Summary: The mesoporous SBA-15 silica material demonstrated significantly higher efficiency in synthesizing ammonia through atmospheric dielectric barrier discharge plasma, mainly due to its hierarchically ordered pore structure that facilitates the diffusion of plasma discharge into the pores.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Applied
Hassnain Abbas Khan, Mohamad Abou-Daher, Ana-Luiza S. de Freitas, Janardhanraj Subburaj, Omar EI Tall, Aamir Farooq
Summary: This work investigates the oxidation of methane, propane and ethylene in the presence of carbon monoxide (CO) and water vapors over Pt and Pd mono and bimetallic catalysts supported on SBA-15. The study finds that Pd exhibits higher activity towards alkanes (methane and propane) at low temperatures, while Pt is more active for ethylene. Optimal alloying compositions have the potential to minimize the decrease in conversion activity in the presence of CO and water vapors.
Article
Chemistry, Applied
Pawanpreet Kaur, Harish Kumar Chopra
Summary: In this study, organosilane-modified benzoxazolium-based ionic liquids were synthesized and immobilized on SBA-15 silica support to form supported ionic liquids (SILs). The structure of SILs was determined using various techniques, and their adsorption abilities were tested in the desulfurization of gasoline samples. The SIL adsorbents showed higher efficiency compared to SBA-15 due to interactions between the supported ionic liquids and thiophene compounds.
FUEL PROCESSING TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Oscar Javier Fonseca-Bermudez, Liliana Giraldo, Rocio Sierra-Ramirez, Juan Carlos Moreno-Pirajan
Summary: This article reviews the methods of removing hydrogen sulfide from biogas through biological treatment, chemical treatment, porous solid treatment, and photocatalysis. Adsorption and photocatalysis methods are compared, and it is found that photocatalysis is an affordable alternative method.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Mariana Chelu, Adina Magdalena Musuc, Ludmila Aricov, Emma Adriana Ozon, Andreea Iosageanu, Laura M. Stefan, Ana-Maria Prelipcean, Monica Popa, Jose Calderon Moreno
Summary: This research describes a new methodology for obtaining biocompatible hydrogels based on Aloe vera for wound healing applications. Two hydrogels (AV5 and AV10) with different concentrations of Aloe vera were prepared using an all-green synthesis method from renewable and bioavailable materials. The hydrogels showed good antibacterial properties and promoted cell proliferation, migration, and wound closure. This Aloe vera based hydrogel may be suitable for wound healing applications based on its morphology, rheological properties, cytocompatibility, and cell viability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Hermine Stroescu, Madalina Nicolescu, Daiana Mitrea, Ecaterina Tenea, Irina Atkinson, Mihai Anastasescu, Jose Maria Calderon-Moreno, Mariuca Gartner
Summary: ZnO and Al-doped ZnO (AZO) thin films were prepared using the sol-gel method and their properties were analyzed. The structure and morphology analyses showed that the thin films are polycrystalline with a hexagonal wurtzite structure. The introduction of defects and an increase in the charge carrier density in the AZO film were observed.
Article
Polymer Science
Mariana Chelu, Monica Popa, Emma Adriana Ozon, Jeanina Pandele Cusu, Mihai Anastasescu, Vasile Adrian Surdu, Jose Calderon Moreno, Adina Magdalena Musuc
Summary: The present research focuses on studying the properties of hydrogels made from allantoin, xanthan gum, salicylic acid, and different concentrations of Aloe vera. The evaluation included thermal behavior, chemical structure, morphology, and pharmacotechnical properties of the hydrogels. Results showed that the addition of Aloe vera led to interactions with the hydrogel matrix, and a formulation with 10% Aloe vera concentration was found suitable for biomedical applications.
Article
Materials Science, Multidisciplinary
Ana-Maria Julieta Popescu, Florina Branzoi, Marian Burada, Jose Calderon Moreno, Mihai Anastasescu, Ioana Anasiei, Mihai Tudor Olaru, Virgil Constantin
Summary: We investigate the corrosion behavior on the microstructure of CoCrFeMnNi high-entropy thin film potentiodynamic alloys electrodeposited on aluminum support. The HEA components were co-deposited on an aluminum foil substrate using different electrolytes and various metal substances. The study demonstrates that the electrodeposition of HEA thin films on an aluminum support is more difficult and has lower corrosion resistance compared to previous work.
Article
Engineering, Chemical
Diana Hernandez-Monje, Liliana Giraldo, Jaroslaw Serafin, Juan Carlos Moreno-Pirajan
Summary: Activated carbons with different physicochemical characteristics were studied to determine their interactions with hydrocarbons. The enthalpy of immersion was determined to evaluate the influence of adsorbents and adsorbates, as well as the addition of another adsorbate. The results showed that the interaction increased with thermal treatment and decreased with chemical modification, both in pure solvents and mixtures. The CO2 adsorption of activated carbons ranged from 3.43 to 3.79 mmol g(-1).
Article
Biochemistry & Molecular Biology
Crina Anastasescu, Simona Neagu, Silviu Preda, Daniela Culita, Mihaela Stancu, Cristian Banciu, Cornel Munteanu, Veronica Bratan, Jose Maria Calderon-Moreno, Razvan State, Mihai Anastasescu, Madalin Enache, Ioan Balint, Maria Zaharescu
Summary: ZnSe, ZnSe-TiO2, and TiO2 materials were synthesized using hydrothermal and sol-gel methods, and their antibacterial activity against Staphylococcus aureus and Micrococcus lysodeikticus was studied. The samples were characterized using microscopy techniques, UV-visible spectroscopy, and their ability to generate reactive oxygen species under visible light irradiation was investigated. The results showed a correlation between antibacterial activity and ROS photogeneration.
Article
Polymer Science
Mariana Chelu, Monica Popa, Jose Calderon Moreno, Anca Ruxandra Leonties, Emma Adriana Ozon, Jeanina Pandele Cusu, Vasile Adrian Surdu, Ludmila Aricov, Adina Magdalena Musuc
Summary: The design of an efficient adsorbent hydrogel based on chitosan, polyethylene glycol 4000 (PEG4000), and xanthan gum (CPX) has been developed for the removal of diclofenac sodium (DCF) from water. The CPX hydrogel showed high viscosity and mechanical stability due to the interaction between chitosan, xanthan gum, and PEG4000. The synthesized hydrogel exhibited pH-independent swelling behavior and achieved a high adsorption capacity for DCF. This study demonstrates the potential of CPX hydrogel as an environmentally friendly option for removing pharmaceutical contaminants from wastewater.
Article
Chemistry, Physical
Maria Covei, Cristina Bogatu, Silvioara Gheorghita, Anca Duta, Hermine Stroescu, Madalina Nicolescu, Jose Maria Calderon-Moreno, Irina Atkinson, Veronica Bratan, Mariuca Gartner
Summary: Researchers have successfully prepared sol-gel titanium dioxide thin films on spherical beads, which have high surface area and easy recovery, and exhibit good photocatalytic activity.
Article
Chemistry, Multidisciplinary
Yaned Milena Correa-Navarro, Gerson-Dirceu Lopez, Chiara Carazzone, Liliana Giraldo, Juan Carlos Moreno-Pirajan
Summary: A new method for degrading persistent pollutants using mechanochemical treatment is studied. By treating biochar and aluminum mixtures with high-energy ball milling, caffeine and diclofenac were successfully degraded and transformation products were identified. This method shows potential application in the environmental management of emerging contaminants.
Review
Polymer Science
Mariana Chelu, Adina Magdalena Musuc, Monica Popa, Jose Calderon Moreno
Summary: This study provides a comprehensive overview of recent advances in aloe vera-based hydrogels for wound healing, including synthesis methods, structural characteristics, properties, and mechanisms of therapeutic agent release. It also highlights the therapeutic effects of aloe vera-based hydrogels on wound healing and their potential for improving outcomes.
Article
Polymer Science
Diana Pelinescu, Mihai Anastasescu, Veronica Bratan, Valentin-Adrian Maraloiu, Catalin Negrila, Daiana Mitrea, Jose Calderon-Moreno, Silviu Preda, Ioana Catalina Gifu, Adrian Stan, Robertina Ionescu, Ileana Stoica, Crina Anastasescu, Maria Zaharescu, Ioan Balint
Summary: Nanostructured oxides (SiO2, TiO2) were synthesized using the sol-gel method and modified with noble metal nanoparticles (Pt, Au) and ruthenium dye to enhance light harvesting and promote the photogeneration of reactive oxygen species. The resulting nanostructures were embedded in a transparent polyvinyl alcohol (PVA) hydrogel. The engineered materials were evaluated for their ability to generate reactive oxygen species (ROS) and showed potential for biomedical applications.
Article
Biochemistry & Molecular Biology
Juan Matos, Claudia P. Amezquita-Marroquin, Johan D. Lozano, Jhon Zapata-Rivera, Liliana Giraldo, Po S. Poon, Juan C. Moreno-Pirajan
Summary: Nanoporous carbons were prepared from mangosteen-peel-derived chars via chemical and physical activation. The bifunctionality of the N groups was utilized to study the removal of atrazine. Various kinetic models and adsorption isotherms were analyzed. The results were compared with commercially activated carbons and the role of surface functional groups in atrazine removal was estimated. This study contributes to the understanding of the interactions between triazine-based pollutants and nanoporous carbons in the liquid-solid interface.
Article
Chemistry, Multidisciplinary
Ana -Maria Popescu, Jose M. Calderon-Moreno, Kazimir Yanushkevish, Alexei Aplevich, Olga Demidenko, Elena Ionela Neacsu, Virgil Constantin
Summary: Sintered NdFeB magnets have excellent magnetic properties but are susceptible to corrosion in acidic environments, while behaving passively in alkaline and saline media. The corrosion behavior of NdFeB magnets in industrial environments was studied using immersion and electrochemical tests. The results showed that the most corrosive electrolyte was HClO4, and the NdFeB sample without magnetic order exhibited better corrosion resistance. Metallographic microscopy and scanning electron microscopy supported the corrosion data, and X-ray photoelectron spectroscopy revealed the oxidation of the main elements (Nd, Fe, B) on the surface of the corroded sample.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2023)
