Article
Engineering, Environmental
Karna Wijaya, Muhammad Ahan Kurniawan, Wahyu Dita Saputri, Wega Trisunaryanti, Mohammad Mirzan, Poedji Loekitowati Hariani, Alfrets Daniel Tikoalu
Summary: Ni-BZS catalyst was synthesized and optimized for hydrocracking process, showing high activity and selectivity, especially Ni-BZS 0.5 catalyst which can convert coconut oil into bio-gasoline efficiently. Further studies on the role of Ni metal and optimization of catalyst composition are needed for future research.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Lourdes Jara-Cobos, Maria Eulalia Penafiel, Carolina Montero, Miguel Menendez, Veronica Pinos-Velez
Summary: Ti-pillared bentonites were used to remove ciprofloxacin (CIP) from aqueous solutions. Pillared sodium bentonite (BSP) and pillared calcium bentonite (BCP) were prepared and characterized. The results showed that pillared bentonites had increased surface areas compared to natural ones, with BSP having a more porous structure and higher adsorption capacity than BCP. Kinetic and isotherm studies revealed that CIP adsorption followed a pseudo second-order kinetic model, with multilayer adsorption observed. The pH influence study indicated that CIP adsorption occurred at pH levels commonly found in wastewater treatment.
Article
Engineering, Environmental
Uziel Ortiz-Ramos, Roberto Leyva-Ramos, Esmeralda Mendoza-Mendoza, Antonio Aragon-Pina
Summary: This study investigated the adsorption of tetracycline onto different clays and analyzed the adsorption mechanisms and influencing factors. Bentonite showed the highest adsorption capacity due to its swelling characteristic, interlayer cations, and tetracycline molecular size. Adsorption occurred on the external surface and in the interlayer space of bentonite, with both physical and chemical mechanisms involved. The adsorption process was partially reversible and endothermic.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Vasu Chaudhary, Sweta Sharma
Summary: The polymer-silica hybrid support catalyst was synthesized by incipient impregnation technique and showed good catalytic activity in the oxidation of ethylbenzene, with acetophenone as the main product and benzaldehyde as the minor product. The highest ethylbenzene conversion rate reached 83.65% at a 1:4 mol ratio of ethylbenzene to TBHP and a temperature of 100 degrees C. The catalysts demonstrated good reusability, with the ability to be reused three times without significant loss in structural and catalytic properties.
Article
Chemistry, Physical
Carmen Andrade, Ana Martinez-Serrano, Miguel Angel Sanjuan, Jose Antonio Tenorio Rios
Summary: The Portland cement industry is looking for alternative additives to reduce clinker production and greenhouse gas emissions, with blast furnace slag and fly ash supply uncertain. New additives that can lower pollutant gas emissions without altering cement performance are being sought.
Article
Thermodynamics
Juan Manuel Martinez, Maria Susana Conconi, Fernando Booth, Nicolas M. Rendtorff
Summary: A Zr-modified bentonite (B-OHZr) was obtained by intercalation of OH-Zr species and its thermal transformations at > 800 degrees C were studied. The Zr interlayering enhanced the refractoriness of the parental clay, allowing sintering at higher temperatures, showing promising features for potential applications in ceramic materials with zircon content.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Environmental Sciences
Fei Wang, Ruilin Zhang, Scott W. Donne, Yaser Beyad, Xiangyue Liu, Xiaoyu Duan, Tongsa Yang, Peiyuan Su, Hongwen Sun
Summary: The addition of minerals can enhance the carbon sequestration potential of biochar by promoting the formation of stable carbon structures and highly aromatic structures. The minerals also increase the chemical and thermal stability of biochar.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Fei Wang, Ruilin Zhang, Scott W. Donne, Yaser Beyad, Xiangyue Liu, Xiaoyu Duan, Tongsa Yang, Peiyuan Su, Hongwen Sun
Summary: The study found that the addition of minerals and high temperatures promoted the formation of stable carbon structures in biochar, reducing carbon loss and increasing chemical and thermal stability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Applied
Ema V. Sabre, Belen M. Viola, Analia L. Canepa, Sandra G. Casuscelli
Summary: This study investigated the preparation of modified pillared clays from bentonite and an acid pillaring solution. The results showed that the pillared materials exhibited excellent catalytic performance in the oxidation of benzyl alcohol, with high conversion, selectivity, and yield. The catalyst could also be recovered and reused effectively.
TOPICS IN CATALYSIS
(2022)
Article
Multidisciplinary Sciences
Filiz Derekaya, Nida Arasan, Cigdem Guldur
Summary: In this study, the effects of different surfactants and solvents on the characterization and activity of CuO-CeO2 catalysts supported on Vulcan XC72 for carbon monoxide oxidation were investigated. The results showed that using surfactant-assisted impregnation method with 1-propanol as solvent produced the most suitable catalysts with the lowest 50% CO conversion temperature. Additionally, increasing the weight ratio of CuO from 5 to 15% led to a decrease in the 50% CO conversion temperature from 106 to 95 degrees Celsius.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Cuiying Zhou, Guangjun Cui, Hao Yin, Lei Yu, Gankai Xu, Zhen Liu, Lihai Zhang
Summary: The expansion of red-bed weathered expansive soil when exposed to water is driven by hydration forces and repulsive forces in the electric double layer. Grain orientation of the soil plays a significant role in influencing the microscopic model. Experiments indicated that the unloading expansion rate decreased with higher cation concentration and lower pH value, but increased with a larger hydration cation radius, providing a theoretical basis for landslide prevention and control.
Review
Environmental Sciences
Avik Kumar Dhar, Humayra Akhter Himu, Maitry Bhattacharjee, Md Golam Mostufa, Fahmida Parvin
Summary: In recent decades, the release of pollutants into aquatic systems from increased industrial, agricultural, and domestic activities has created a need for reliable and environmentally friendly methods of removal. Bentonite clays have emerged as a cost-effective and sustainable solution in wastewater treatment, offering superior properties such as high adsorption capacity and chemical stability.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Dul-Sun Kim, Dong-Keun Lee
Summary: TiO2-PILCs and iron-doped TiO2-PILCs were effective in destroying toxic microcystin-LR under UV light with H2O2, but the deactivation of iron particles hindered the complete conversion of TOC.
ENVIRONMENTAL TECHNOLOGY
(2021)
Article
Engineering, Chemical
Alemtsehay Tesfay Reda, Dongxiang Zhang, Xiyan Xu, Shengyang Xu
Summary: This study reports a novel composite material for vapor iodine capture. The material exhibits high capture capacity and stability, making it a potential iodine storage material in the nuclear industry.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Chemistry, Physical
Y. Cardona, S. A. Korili, A. Gil
Summary: Conventional wastewater treatment plants fail to remove all organic compounds, including emerging pollutants. Efforts have been made to develop new methods and materials, or improve existing ones, to tackle this issue. Photocatalytic processes that generate radicals under the influence of photons have shown promising results in the removal of organic contaminants. Clays and PILC have been used as photocatalysts and catalyst supports, and have demonstrated interesting findings in the photodegradation of various organic compounds in water. This review summarizes and compares the reported results, confirming the efficacy and potential of these systems in removing organic compounds. Furthermore, new synthesis procedures for PILC materials can be proposed using Heterostructures and MOF based on clays.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Applied
Fazia Agueniou, Hilario Vidal, M. Pilar Yeste, Juan C. Hernandez-Garrido, Miguel A. Cauqui, Jose M. Rodriguez-Izquierdo, Jose J. Calvino, Jose M. Gatica
Summary: The study evaluated the performance of Ni catalysts supported by Ce-Zr oxide in dry reforming of methane, and the structured catalysts showed better performance at high temperatures without deactivation.
Article
Environmental Sciences
M. Sendra, P. Pereiro, M. P. Yeste, L. Mercado, A. Figueras, B. Novoa
Summary: This study used zebrafish as a model to investigate the uptake, trafficking, degradation, and genotoxicity of polystyrene nanoparticles at cellular and systemic levels. Results showed that nanoparticles mainly accumulated in the gut, leading to increased reactive oxygen species, decreased antioxidant gene expression, and induced migration of immune cells.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Applied
Carolina De los Santos, Hilario Vidal, Jose Manuel Gatica, M. Pilar Yeste, Gustavo Cifredo, Jorge Castiglioni
Summary: Clay honeycomb monoliths washcoated by pillared clay were used as support of manganese catalysts for acetone oxidation. The pillared clay washcoated sample exhibited better performance in acetone oxidation than the non-coated sample with higher manganese loading.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Martin Torres, Carolina de los Santos, Patrice Portugau, Maria Del Pilar Yeste, Jorge Castiglioni
Summary: Catalytic oxidation is an effective method to remove volatile organic compounds, and this study investigates the behavior of a group of catalysts extracted from Uruguay for the total combustion of toluene. The catalyst containing 40% Mn2O3 on the pillared clay showed the best catalytic performance, with 90% conversion of toluene at 300 degrees Celsius.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Applied
J. C. Martinez-Munuera, V. M. Serrano-Martinez, J. Gimenez-Manogil, M. P. Yeste, A. Garcia-Garcia
Summary: This research aimed to study the nature of active sites and synergies in copper/ceria-zirconia formulations for low temperature CO oxidation by creating copper entities with different properties. Results showed that increasing copper loading up to 2% led to gradual improvements in activity and reducibility. The preparation method was identified as a critical variable in catalytic performance, with the IWI method showing superior results.
Article
Chemistry, Physical
J. C. Martinez-Munuera, J. Gimenez-Manogil, M. P. Yeste, A. B. Hungria, M. A. Cauqui, A. Garcia-Garcia, J. J. Calvino
Summary: The preferential oxidation of CO in H-2-rich mixtures was studied using Cu catalysts supported by Ce0.8Zr0.2O2 with increasing copper content (1 wt% Cu1/CZ, 2 wt% Cu2/CZ, and 4 wt% Cu4/CZ). The most active catalyst in the CO-PROX reaction at low temperatures was found to be Cu1/CZ, despite having a lower copper content. The results were discussed and correlated with the catalysts' textural properties and parameters such as metal dispersion and interfacial active sites.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Pilar Yeste, M. Amine Fellak, Hilario Vidal, Francisco M. Guerra, F. Javier Moreno-Dorado, Jose M. Gatica
Summary: In this study, a copper-iron mixed oxide was deposited on cordierite honeycomb monoliths using the washcoating procedure, creating an excellent heterogeneous catalyst. The prepared catalyst exhibited high yield and stability in the selective production of allylic ester in the Kharasch-Sosnovsky oxidation of cyclohexene with benzoic acid. The use of a structured catalyst offers an interesting alternative to homogeneous catalysis in synthetic chemistry.
Article
Energy & Fuels
D. Ballesteros-Plata, A. Infantes-Molina, E. Rodriguez-Castellon, M. A. Cauqui, M. P. Yeste
Summary: By adjusting the Pd/Nb ratio, the catalytic activity of the catalyst can be improved, with bimetallic samples showing higher activity compared to monometallic ones. The presence of Nb can reduce the amount of carbon deposited on the catalyst, increasing the stability of the catalyst.
Article
Environmental Sciences
Enrique Gonzalez-Ortegon, Marta Sendra, Erica Sparaventi, Ricardo F. Sanchez Leal, Isaac de los Rios, Francisco Baldo, Daniel Gonzalez-Fernandez, Maria Pilar Yeste
Summary: This study examines small microplastics (SMPs) in the Gulf of Cadiz and reveals higher densities compared to other regions worldwide. The density of SMPs decreases from the coastline to the outer stations, indicating a coastal gradient influenced by estuarine outflows. The predominant SMPs range in size from 45 to 193 μm and are composed mostly of polyethylene and polypropylene. The associated metals include Na, K, Fe, Ca, Cr, Zr, and Hf, with a particularly high proportion of Zr compared to Fe.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Environmental
Marta Sendra, Patricia Pereiro, Maria Pilar Yeste, Beatriz Novoa, Antonio Figueras
Summary: This study analyzed the toxicogenomic effects of face masks at different stages of degradation in zebrafish larvae. The results showed that degradation products from face masks could act as endocrine disruptors, affecting reproduction, immune-related genes, and metabolic processes.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Maria Pilar Yeste, Juan Carlos Hernandez-Garrido, Michael Uwe Kumke, Sarah Alvarado, Miguel Angel Cauqui, Jose Juan Calvino, Philipp-Alexander Primus
Summary: The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development. In this study, zirconia-supported ceria catalysts were synthesized and characterized. Experimental results show that the formation of reversible reactive pyrochlore structures can be achieved through low-temperature reduction-oxidation pretreatment, without altering the morphology of the catalyst.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Ceramics
M. P. Yeste, C. Fernandez-Ponce, E. Felix, M. Tinoco, R. Fernandez-Cisnal, C. Garcia-Villar, C. Pfaff, J. Kriwet, E. Natividad, M. A. Cauqui, F. Garcia-Cozar, R. Litran, O. Bomati-Miguel
Summary: A solvothermal route to prepare glutathione capped hybrid ytterbium/iron oxide nanoparticles has been developed and their structural and morphological characteristics were extensively studied. The functionalized nanoparticles show promising potential as a dual contrast agent in medical image techniques.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Amar Bendieb Aberkane, Maria Pilar Yeste, Faycal Djazi, Miguel Angel Cauqui
Summary: In this study, a series of NiO-CeO2 mixed-oxide catalysts were prepared using a modified co-precipitation method. The influence of the preparation method and pH value on the properties of the catalysts were investigated. The catalyst prepared at a higher pH value exhibited better performance in the CO methanation reaction.
Article
Chemistry, Organic
Pablo Macias-Benitez, Alfonso Sierra-Padilla, M. Pilar Yeste, Jose Maria Palacios-Santander, Laura Cubillana-Aguilera, Jose M. Gatica, Hilario Vidal, Francisco M. Guerra, F. Javier Moreno-Dorado
Summary: A copper-iron-based catalyst was prepared using a low-temperature co-precipitation and sonication method. The use of high-energy ultrasound reduced the preparation time from one workweek to one day compared to conventional methods. The resulting material was characterized using various techniques and showed catalytic activity in the acyloxylation reaction. Microwave irradiation improved the outcome of the reaction in terms of cleanliness, yield, and time.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Miguel Lopez-Haro, Isabel Gomez-Recio, Huiyan Pan, Juan J. Delgado, Xiaowei Chen, Miguel A. Cauqui, Jose A. Perez-Omil, Maria L. Ruiz-Gonzalez, Maria Hernando, Marina Parras, Jose M. Gonzalez-Calbet, Jose J. Calvino
Summary: The oxygen stoichiometry of nanostructures of hollandite, KxMnO2-delta, nanorods was accurately determined using STEM XEDS experiments and a methodology combining 3D reconstructions of electron tomography experiments with quantification through the zeta-factors method of XEDS spectra. The overall composition of the nanorods was found to be K0.13MnO1.98. The quantitative agreement with macroscopic techniques validates the proposed methodology for analyzing light elements in the presence of heavy ones in nanostructured materials.
MICROSCOPY AND MICROANALYSIS
(2023)
