Article
Environmental Sciences
Yegeng Sun, Wei Zhang, Qing Wang, Ning Han, Avelino Nunez-Delgado, Yue Cao, Weimeng Si, Fagang Wang, Shaomin Liu
Summary: A mesoporous carbon derived from beancurd was used as a support for Au@Pd@Pt core-shell catalysts, showing higher ORR activity, specific, and mass activities compared to commercial Pt/C catalyst. The sample exhibited excellent durability after 20000 cycles of rapid testing, indicating promising potential for environmental applications.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Chemical
Ozlem Berkun Olgun, Burcu Palas, Suheyda Atalay, Gulin Ersoz
Summary: Fe/AC catalyst showed better performance in treating pharmaceutical wastewater, achieving higher COD removal efficiency in a shorter reaction time. CWAO method proved to be more suitable, obtaining higher COD removal efficiency at 50 degrees C, pH=3, and 3 g/L catalyst loading.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Environmental
Diogo F. M. Santos, Olivia S. G. P. Soares, Adrian M. T. Silva, Jose L. Figueiredo, Manuel Fernando R. Pereira
Summary: Carbon coated ceramic monoliths prepared by washcoating with N-doped carbon nanotubes (CNTs) and chemical vapour deposition (CVD) growing carbon nanofibers (CNFs) were tested in catalytic wet oxidation of oxalic acid. The washcoating method achieved high oxalic acid conversion rates at high temperatures, while the CVD method resulted in higher oxalic acid removal per mass of carbon due to the presence of nitrogen groups.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Mahdi Bourassi, Gwendoline Lafaye, Bertrand Gombert, Petr Kluson, Jacques Barbier Jr
Summary: Conventional wastewater treatment plants cannot effectively eliminate emerging contaminants. Catalytic wet air oxidation provides a promising solution for treating concentrated active molecules. This study found that platinum supported on cerium oxide and mixed cerium and zirconium oxides can effectively degrade sulfamethoxazole and tetracycline.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Applied
Teng-ge Mi, Yang-wen Wu, Xin-yue Zhou, Wen-tao Li, Li Zhao, Ji Liu, Qiang Lu
Summary: The study investigates the mechanisms of carbon monoxide (CO) oxidation on two SCR catalyst models and finds that the CO oxidation cycle consists of two key stages. The activation energy for CO oxidation on V2O5/TiO2 surface is lower than that on V2O5-WO3/TiO2, indicating that WO3 doping inhibits the CO oxidation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jeremy Audevard, Anas Benyounes, Ruben Castro Contreras, Hicham Abou Oualid, Mohamed Kacimi, Philippe Serp
Summary: Carbon nanotubes are of great interest in catalysis, either as catalyst support or catalyst itself. This study investigates the effect of CNT doping (O, N, S) on the catalytic performance of CNT and Pd/CNT catalysts in the reduction of 4-nitrophenol. It is found that only N-doped CNT is active at room temperature in the presence of NaBH4. Furthermore, the nature of the support influences the location, ratio, and extent of H-spillover of Pd nanoparticles, which directly affect the catalytic activity.
Article
Engineering, Environmental
Befkadu Ayalkie Gizaw, Nigus Gabbiye Habtu
Summary: The catalytic wet air oxidation process using copper oxide loaded activated carbon catalyst has been shown to be effective in degrading reactive red 2 mono azo dye, achieving complete dye decolorization and high chemical oxygen demand (COD) conversion rate under certain operating conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jiangnan Huang, Jiatong Bai, Jianning Feng, Qi Jiang, Guangxing Yang, Hongjuan Wang, Hao Yu, Qiao Zhang, Yonghai Cao, Feng Peng
Summary: The catalytic synthesis of lactones from alkanes using carbon nanotubes and aldehydes as catalysts has been proposed. The results showed that nitrogen-doped carbon nanotubes can enhance the catalytic activity and selectivity for epsilon-caprolactone production. The mechanism of the reaction involves the activation of benzaldehyde to generate carbonyl radicals, which then activate the alkane molecules and promote oxidation.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Gulen Tekin, Gulin Ersoz, Suheyda Atalay
Summary: This study investigated the use of biomass-based materials as co-catalysts for sugar industry wastewater treatment and hydrogen production. The findings suggest that biochar is a promising alternative to replace metal catalysts, with high removal efficiencies for total saccharide and COD. Although hydrogen production was relatively lower, the produced hydrogen to initial sucrose ratio was considered promising.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Pablo Gutierrez-Sanchez, Silvia Alvarez-Torrellas, Marcos Larriba, M. Victoria Gil, Juan M. Garrido-Zoido, Juan Garcia
Summary: In this study, sewage sludge-derived activated carbon loaded with iron nanoparticles (FeSAC) exhibited highly effective catalytic activity in the degradation of the antibiotic ciprofloxacin through the CWAO reaction. The properties of the FeSAC catalyst were characterized using various techniques. The CWAO reaction was evaluated under different conditions, and temperature and catalyst dosage were found to significantly impact the removal of the antibiotic. A potential equation was proposed to describe the degradation of ciprofloxacin, and Density Functional Theory calculations were performed to understand the degradation mechanism. The synthesized catalyst showed high stability and potential for application in environmentally-relevant matrices at a low treatment cost.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Dong-kyu Son, Sooan Bae, Shrine Maria Nithya Jeghan, Gibaek Lee
Summary: Highly efficient and durable FeCo-N,S@CNFs catalysts were synthesized for oxygen reduction reactions. The catalysts showed defect-rich active sites, enhancing the ORR activity, and exhibited long-term stability and high tolerance to methanol. The synergistic interactions between metals and heteroatoms played a crucial role in enhancing the ORR activity. These catalysts can be widely used in battery-based systems and fuel cell applications.
Article
Engineering, Environmental
Guoqiang Li, Siqi Chai, Guojie Zhang, Jun Liu, Yongfa Zhang, Yongkang Lv, Ying Wang, Yuqiong Zhao
Summary: In this study, Ce-modified Cu-based carbon materials (Cu-Ce/AC) were prepared and used as catalysts for the catalytic wet air oxidation (CWAO) degradation of phenol wastewater. The research found that the stability of Cu-Ce/AC catalyst was weaker in acidic environment and maintained high activity in alkaline environment. The incomplete degradation intermediate products accumulated and blocked the active sites of the catalyst, leading to its deactivation. Additionally, a redox cycle between Cu and Ce was observed during phenol degradation, promoting the formation of oxygen vacancies and enhancing the degradation process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Jorge Lopez, Ana Rey, Juan F. Garcia-Araya, Pedro M. Alvarez
Summary: The article presents a novel synthesis method for the preparation of magnetite-based catalysts under a green philosophy. The method involves the use of terephthalic acid to drive the synthesis route and recovery of excess reactants. The synthesized catalysts showed typical crystalline phase, moderate surface area, and magnetic properties. They also exhibited excellent catalytic performance in the wet peroxide oxidation of an aqueous solution under simulated solar radiation.
Review
Environmental Sciences
Chenglin Feng, Xiaolong Liu, Tingyu Zhu, Mengkui Tian
Summary: This article reviews recent research on the application of noble metal catalysts in the catalytic oxidation of CO, summarizing the effects of catalyst support, dopant, and physicochemical properties on the catalytic activity for CO oxidation. It emphatically discusses the influence of water vapor and sulfur dioxide on the catalytic activity in CO oxidation and presents several reaction mechanisms of CO catalytic oxidation on noble metal catalysts. Finally, the challenges of removing CO by catalytic oxidation in practical industrial flue gas are proposed.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Priyanka Gupta, Nishith Verma
Summary: The study introduces a catalytic wet air oxidation (CWAO) technique using iron nanoparticle-dispersed carbon nanofibers on activated carbon beads for efficient mineralization of glyphosate in wastewater. Complete degradation of PMG was achieved within 6 hours under experimental conditions, with a turnover frequency value of 2.056 x 10(-2) s(-1 and 80% chemical oxygen demand removal.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
A. Sofia G. G. Santos, Joao Restivo, Carla A. Orge, M. Fernando R. Pereira, O. Salome G. P. Soares
Summary: In recent years, mechano-chemically modified carbon nanotubes have been widely used in catalysis, but their compatibility with traditional coating methods is limited. This study proposes a novel method for coating macro-structured catalysts with pre-modified monometallic CNT catalysts, using a solution of surfactant to achieve catalyst-binding. The activity of the prepared catalysts is influenced by factors such as metallic dispersion, surfactant coverage, and distribution of the palladium throughout the catalytic layer.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Chemistry, Applied
Ouissal Assila, Oscar Barros, Antonio M. F. Fonseca, Pier Parpot, Olivia S. G. P. Soares, Manuel F. R. Pereira, Farid Zerrouq, Abdelhak Kherbeche, Elizabetta Rombi, Teresa Tavares, Isabel C. Neves
Summary: The effect of different parameters on the degradation of pollutants in water by Fenton-like oxidation was studied using the Box-Behnken design. Three bimetallic catalysts were prepared and used for Fenton-like oxidation of organic pollutants in water. The optimal catalytic conditions were found to be a temperature of 40 degrees C and an H2O2 concentration of 90 mM, resulting in high conversion rates for Tar and Caf.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Francisca Sousa-Cardoso, Rita Teixeira-Santos, Ana Francisca Campos, Marta Lima, Luciana C. Gomes, Olivia S. G. P. Soares, Filipe J. Mergulhao
Summary: Biofouling is a recognized concern in the marine sector due to its economic and ecological consequences. This study focused on the impact of graphene nanoplatelets (GNP) on biofilm development by Cobetia marina bacteria and investigated the antibacterial mechanisms of action. The results showed that GNP inhibited biofilm development and had potential as a marine antifouling coating.
Article
Chemistry, Physical
Rui S. Ribeiro, Ana Luisa S. Vieira, Krzysztof Biernacki, Alexandre L. Magalhaes, Juan J. Delgado, Rafael G. Morais, Natalia Rey-Raap, Raquel P. Rocha, M. Fernando R. Pereira
Summary: Hollow carbon spheres (CSs) were synthesized with stable single-atom Fe-N species as alternatives to noble metals-based electrocatalysts for oxygen reduction reaction (ORR). The CSs were finely tuned through a synthesis methodology requiring only earth-abundant metal precursors. Single-atom Fe-N active sites were introduced on the CSs, resulting in a significant enhancement in ORR activity. Advanced characterization and molecular simulation studies revealed the crucial role of nitrogen in anchoring individual iron atoms and modulating the charge density nearby the active sites.
Article
Environmental Sciences
C. A. L. Graca, R. Zema, C. A. Orge, J. Restivo, J. Sousa, M. F. R. Pereira, O. S. G. P. Soares
Summary: The occurrence of emerging pollutants in wastewater treatment plants hinders their reutilization, which calls for effective removal methods without compromising water quality. Ozonation has been explored, but limitations exist towards oxidant-resistant pollutants. The use of carbon catalysts, such as activated carbons, provides an environmentally attractive option. In this study, the catalytic ozonation of salicylic acid was tested using different activated carbons, and the thermal treatment under H2 increased catalytic activity. The best-performing activated carbon showed resistance to ozone and ability to convert ozone into more reactive species.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Multidisciplinary
Sara Abreu, Nuno Vale, Olivia Salome G. P. Soares
Summary: Due to the increase in new types of cancer cells and resistance to drugs, nanotechnology is being applied to biomedical areas as an alternative cancer treatment to minimize side effects and drug resistance and improve treatment efficacy. This study focused on finding a promising cancer treatment for colorectal adenocarcinoma cells using carbon nanotubes (CNTs) combined with different drugs (5-fluorouracil (5-FU) and repurposing drugs tacrine (TAC) and ethionamide (ETA)). CNT samples with different functional groups and textural properties were prepared and characterized, and the results showed that CNTs doped with nitrogen and sulfur groups (CNT-BM-N and CNT-H2SO4-BM) improved the activity of 5-FU and TAC.
Article
Chemistry, Multidisciplinary
Rita Teixeira-Santos, Luciana C. Gomes, Rita Vieira, Francisca Sousa-Cardoso, Olivia S. G. P. Soares, Filipe J. Mergulhao
Summary: Graphene nanoplatelet (GNP)-based composites as coatings for urinary catheters (UCs) were investigated for their antibiofilm efficacy. The composite showed inhibitory effects on the development of biofilms of various bacteria, and influenced the structure of the biofilm. Moreover, the functionalized GNP caused changes in membrane permeability and triggered reactive oxygen species synthesis in Staphylococcus aureus, whereas in Gram-negative bacteria, it only induced changes in cell metabolism. This suggests the potential of GNP-based composites as coatings for UCs.
Article
Materials Science, Multidisciplinary
Samuel Belo, Francisca Sousa-Cardoso, Rita Teixeira-Santos, Luciana C. Gomes, Rita Vieira, Jelmer Sjollema, Olivia S. G. P. Soares, Filipe J. Mergulhao
Summary: This study evaluated the performance of graphene oxide (GO)/polydimethylsiloxane (PDMS) composites against Staphylococcus aureus and Pseudomonas aeruginosa biofilms. The results showed that the 1% GO/PDMS composite had a good inhibitory effect on S. aureus biofilm formation, while it had no significant effect on P. aeruginosa. GO increased the membrane permeability, metabolic activity, and endogenous reactive oxygen species synthesis in S. aureus.
Article
Engineering, Chemical
Ana Sofia G. G. Santos, Joao Restivo, Carla Alexandra Orge, Manuel Fernando R. Pereira, Olivia Salome G. P. Soares
Summary: In this study, the behavior of Pd-Cu macrostructured catalysts in the nitrate catalytic reduction reaction was investigated. The results revealed that catalyst loading and inlet flow rate were the most significant parameters affecting the conversion and selectivity. Higher catalyst loading and lower inlet flow rates allow for longer contact time between the phases, leading to improved catalytic results.
Article
Chemistry, Physical
Ana Rita Querido, Liliana P. L. Goncalves, Yury V. V. Kolen'ko, M. Fernando R. Pereira, O. Salome G. P. Soares
Summary: The reverse water-gas shift reaction (RWGS) is crucial for converting CO2 to CO, which is used for the production of various chemicals and synthetic fuels. In this study, Cu-based catalysts supported on pristine CNTs and composites of pristine and functionalized CNTs : ZnO were prepared to enhance the efficiency of RWGS catalysts. The presence of ZnO in the catalyst structure proved to be beneficial, resulting in a higher CO2 conversion and CO yield compared to catalysts supported on pristine CNTs. Additionally, the N-doping of CNTs further improved the CO2 conversion and CO yield, with stability observed for at least 93 hours.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Infectious Diseases
Marisa Gomes, Rita Teixeira-Santos, Luciana C. Gomes, Francisca Sousa-Cardoso, Fabio M. Carvalho, Andreia R. Tome, Olivia S. G. P. Soares, Kathryn A. Whitehead, Filipe J. Mergulhao
Summary: Chemically modified carbon nanotubes incorporated into a PDMS matrix show effective antibacterial activity against biofilms. The antimicrobial activity of the nanotubes can be efficiently tailored through nitric acid functionalization and thermal treatment. The composites exhibit increased antimicrobial activity without surface carboxylic groups, and their redox activity contributes to the enhancement of the antimicrobial properties. The nanomaterials can change the membrane permeability and induce ROS production in bacteria, while remaining biocompatible with human kidney cells.
Article
Chemistry, Physical
Ouissal Assila, Zineb Bencheqroun, Elisabetta Rombi, Teresa Valente, Amalia S. Braga, Hicham Zaitan, Abdelhak Kherbeche, Olivia S. G. P. Soares, Manuel F. R. Pereira, Antonio M. Fonseca, Pier Parpot, Isabel C. Neves
Summary: Three raw clays from Morocco were used as heterogeneous catalysts for Fenton-like oxidation of organic pollutants in water. The results showed that the clays were effective in the degradation of dyes and caffeine, and the clay-modified electrodes also showed good performance in the degradation of dyes.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)