1
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Yamin M, Ghouri ZK, Rohman N, Syed JA, Skelton A, Ahmed K. Unravelling pH/pKa influence on pH-responsive drug carriers: Insights from ibuprofen-silica interactions and comparative analysis with carbon nanotubes, sulfasalazine, and alendronate. J Mol Graph Model 2024; 128:108720. [PMID: 38324969 DOI: 10.1016/j.jmgm.2024.108720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 01/04/2024] [Accepted: 01/23/2024] [Indexed: 02/09/2024]
Abstract
This study employs density functional theory to explore the interaction between ibuprofen (IBU) and silica, emphasizing the influence of the trimethylsilyl (TMS) functional group for designing pH-responsive drug carriers. The surface (S) and drug (D) molecules' neutral (0) or deprotonated (-1) states were taken into consideration during the investigation. The likelihood of these states was determined based on the pKa values and the desired pH conditions. To calculate the pH-dependent interaction energy (EintpH), four different situations have been identified: S0D0, S0D-1, S-1D0, and S-1D-1.The electrostatic component of interaction energy aligns favorably with its theoretical value in both the Debye-Hückel and Grahame models. The investigation has gathered first-hand experimental data on the drug loading and release of pH-responsive mesoporous silica nanoparticles. Effective drug loading was observed in the acidic environment of the stomach (pH 2-5), followed by a release in the slightly basic to neutral pH of the small intestine (pH 7.4), These findings align with existing literature. The results revealed horizontal drug adherence on silica surfaces, improving binding capabilities. Comparisons were made with combinations involving carboxylated carbon nanotubes and ibuprofen, silica, and sulfasalazine, and silica and alendronate, exploring drug loading/release dynamics associated with positive/negative interaction energies. The investigation, supported by experimental data, contributes valuable insights into pH-responsive mesoporous silica nanoparticles, offering new design possibilities for drug carriers.
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Affiliation(s)
- Marriam Yamin
- Department of Biosciences, Salim Habib University, Karachi, Pakistan
| | - Zafar Khan Ghouri
- L. E. J. Nanotechnology Centre, H. E. J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan; Net Zero Industry Innovation Centre, Teesside University, Middlesbrough, Tees Valley TS1 3BX, UK
| | - Nashiour Rohman
- Department of Chemistry, College of Science, Sultan Qaboos University, P. O. Box 36, Al-khoudh, Muscat P. C. 123, Oman
| | - Junaid Ali Syed
- L. E. J. Nanotechnology Centre, H. E. J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Adam Skelton
- Department of Pharmaceutical Sciences, University of KwaZulu-Natal, Durban, 4000, South Africa.
| | - Khalid Ahmed
- L. E. J. Nanotechnology Centre, H. E. J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan.
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2
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Liu Q, van Bokhoven JA. Water structures on acidic zeolites and their roles in catalysis. Chem Soc Rev 2024; 53:3065-3095. [PMID: 38369933 DOI: 10.1039/d3cs00404j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
The local reaction environment of catalytic active sites can be manipulated to modify the kinetics and thermodynamic properties of heterogeneous catalysis. Because of the unique physical-chemical nature of water, heterogeneously catalyzed reactions involving specific interactions between water molecules and active sites on catalysts exhibit distinct outcomes that are different from those performed in the absence of water. Zeolitic materials are being applied with the presence of water for heterogeneous catalytic reactions in the chemical industry and our transition to sustainable energy. Mechanistic investigation and in-depth understanding about the behaviors and the roles of water are essentially required for zeolite chemistry and catalysis. In this review, we focus on the discussions of the nature and structures of water adsorbed/stabilized on Brønsted and Lewis acidic zeolites based on experimental observations as well as theoretical calculation results. The unveiled functions of water structures in determining the catalytic efficacy of zeolite-catalyzed reactions have been overviewed and the strategies frequently developed for enhancing the stabilization of zeolite catalysts are highlighted. Recent advancement will contribute to the development of innovative catalytic reactions and the rationalization of catalytic performances in terms of activity, selectivity and stability with the presence of water vapor or in condensed aqueous phase.
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Affiliation(s)
- Qiang Liu
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir Prelog Weg 1, 8093 Zurich, Switzerland.
| | - Jeroen A van Bokhoven
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir Prelog Weg 1, 8093 Zurich, Switzerland.
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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3
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Zhang K, Dou X, Hou H, Zhou Z, Lopez-Haro M, Meira DM, Liu P, He P, Liu L. Generation of Subnanometer Metal Clusters in Silicoaluminate Zeolites as Bifunctional Catalysts. JACS AU 2023; 3:3213-3226. [PMID: 38034962 PMCID: PMC10685439 DOI: 10.1021/jacsau.3c00548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/07/2023] [Accepted: 10/09/2023] [Indexed: 12/02/2023]
Abstract
Zeolite-encapsulated subnanometer metal catalysts are an emerging class of solid catalysts with superior performances in comparison to metal catalysts supported on open-structure solid carriers. Currently, there is no general synthesis methodology for the encapsulation of subnanometer metal catalysts in different zeolite structures. In this work, we will show a general synthesis method for the encapsulation of subnanometer metal clusters (Pt, Pd, and Rh) within various silicoaluminate zeolites with different topologies (MFI, CHA, TON, MOR). The successful generation of subnanometer metal species in silicoaluminate zeolites relies on the introduction of Sn, which can suppress the migration of subnanometer metal species during high-temperature oxidation-reduction treatments according to advanced electron microscopy and spectroscopy characterizations. The advantage of encapsulated subnanometer Pt catalysts in silicoaluminate zeolites is reflected in the direct coupling of ethane and benzene for production of ethylbenzene, in which the Pt and the acid sites work in a synergistic way.
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Affiliation(s)
- Kun Zhang
- State
Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaomeng Dou
- Department
of Chemistry, Tsinghua University, Beijing 100084, China
| | - Huaming Hou
- National
Energy Center for Coal to Clean Fuels, Synfuels
China Technology Co., Ltd., Beijing 101407, China
| | - Ziyu Zhou
- State
Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Miguel Lopez-Haro
- Departamento
de Ciencia de los Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Puerto Real, Cádiz 11519, Spain
| | - Debora M. Meira
- CLS@APS
sector
20, Advanced Photon Source, Argonne National
Laboratory, 9700 S. Cass
Avenue, Argonne, Illinois 60439, United States
- Canadian
Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Ping Liu
- State
Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
| | - Peng He
- State
Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- National
Energy Center for Coal to Clean Fuels, Synfuels
China Technology Co., Ltd., Beijing 101407, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Lichen Liu
- Department
of Chemistry, Tsinghua University, Beijing 100084, China
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4
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Kurupath VP, Coasne B. Mixture Adsorption in Nanoporous Zeolite and at Its External Surface: In-Pore and Surface Selectivity. J Phys Chem B 2023; 127:9596-9607. [PMID: 37879034 DOI: 10.1021/acs.jpcb.3c04221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
Using toluene, ethylene, and water as gas compounds with different representative molecular interactions, we perform atom-scale simulations for their mixtures to investigate the selectivity of the core nanoporosity and external surface in a prototypical zeolite. As expected, the overall behavior suggests that increasing the pressure of a given component promotes the desorption of the coadsorbing species. However, for water-toluene mixtures, we identify that the pseudohydrogen bonding between water and toluene leads to beneficial coadsorption as toluene adsorption in the low-pressure range promotes water adsorption. Moreover, when the zeolite is completely filled with water, toluene adsorption does not occur due to steric repulsion, and ethylene shows oversolubility as the amount of ethylene per water molecule is significantly larger than in bulk water. The underlying oversolubility mechanism is found to be due to localized ethylene adsorption in the density minima arising from the layering of water in nanoconfinement. Despite these specific effects, the relatively weak coadsorption effects in the zeolite nanoporosity, which are found to be reasonably captured using the ideal adsorbed solution theory, arise from the fact that adsorption of these gases having different molecular sizes occurs in distinct pore regions (channel type, channel intersection). Finally, in contrast to confinement in the nanoporosity, mixture adsorption at the external surface does not show coadsorption effects as it mostly follows the Henry regime. These results show that selectivity is mostly governed by the confinement effects as the external surface leads to a selectivity loss.
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Affiliation(s)
| | - Benoit Coasne
- Univ. Grenoble Alpes, CNRS LIPhy, Grenoble F-38000, France
- Institut Laue-Langevin, Grenoble F-38042, France
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5
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Shelyapina MG, Nefedov DY, Antonenko AO, Valkovskiy GA, Yocupicio-Gaxiola RI, Petranovskii V. Nanoconfined Water in Pillared Zeolites Probed by 1H Nuclear Magnetic Resonance. Int J Mol Sci 2023; 24:15898. [PMID: 37958879 PMCID: PMC10648503 DOI: 10.3390/ijms242115898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 10/26/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
Here, we report the results of our 1H nuclear magnetic resonance study of the dynamics of water molecules confined in zeolites (mordenite and ZSM-5 structures) with hierarchical porosity (micropores in zeolite lamella and mesopores formed by amorphous SiO2 in the inter-lamellar space). 1H nuclear magnetic resonance (NMR) spectra show that water experiences complex behavior within the temperature range from 173 to 298 K. The temperature dependence of 1H spin-lattice relaxation evidences the presence of three processes with different activation energies: freezing (about 30 kJ/mol), fast rotation (about 10 kJ/mol), and translational motion of water molecules (23.6 and 26.0 kJ/mol for pillared mordenite and ZSM-5, respectively). For translational motion, the activation energy is markedly lower than for water in mesoporous silica or zeolites with similar mesopore size but with disordered secondary porosity. This indicates that the process of water diffusion in zeolites with hierarchical porosity is governed not only by the presence of mesopores, but also by the mutual arrangement of meso- and micropores. The translational motion of water molecules is determined mainly by zeolite micropores.
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Affiliation(s)
- Marina G. Shelyapina
- Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, Russia; (D.Y.N.); (A.O.A.); (G.A.V.)
| | - Denis Y. Nefedov
- Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, Russia; (D.Y.N.); (A.O.A.); (G.A.V.)
| | - Anastasiia O. Antonenko
- Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, Russia; (D.Y.N.); (A.O.A.); (G.A.V.)
| | - Gleb A. Valkovskiy
- Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, Russia; (D.Y.N.); (A.O.A.); (G.A.V.)
| | - Rosario I. Yocupicio-Gaxiola
- Tecnológico Nacional de México, Instituto Tecnológico Superior de Guasave, Carretera a La Brecha Sin Número, Ejido Burrioncito, Guasave 81149, Sinaloa, Mexico;
| | - Vitalii Petranovskii
- Center for Nanoscience and Nanotechnology, National Autonomous University of Mexico (CNyN, UNAM), Ensenada 22860, Baja California, Mexico;
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6
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Chizallet C, Bouchy C, Larmier K, Pirngruber G. Molecular Views on Mechanisms of Brønsted Acid-Catalyzed Reactions in Zeolites. Chem Rev 2023; 123:6107-6196. [PMID: 36996355 DOI: 10.1021/acs.chemrev.2c00896] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Abstract
The Brønsted acidity of proton-exchanged zeolites has historically led to the most impactful applications of these materials in heterogeneous catalysis, mainly in the fields of transformations of hydrocarbons and oxygenates. Unravelling the mechanisms at the atomic scale of these transformations has been the object of tremendous efforts in the last decades. Such investigations have extended our fundamental knowledge about the respective roles of acidity and confinement in the catalytic properties of proton exchanged zeolites. The emerging concepts are of general relevance at the crossroad of heterogeneous catalysis and molecular chemistry. In the present review, emphasis is given to molecular views on the mechanism of generic transformations catalyzed by Brønsted acid sites of zeolites, combining the information gained from advanced kinetic analysis, in situ, and operando spectroscopies, and quantum chemistry calculations. After reviewing the current knowledge on the nature of the Brønsted acid sites themselves, and the key parameters in catalysis by zeolites, a focus is made on reactions undergone by alkenes, alkanes, aromatic molecules, alcohols, and polyhydroxy molecules. Elementary events of C-C, C-H, and C-O bond breaking and formation are at the core of these reactions. Outlooks are given to take up the future challenges in the field, aiming at getting ever more accurate views on these mechanisms, and as the ultimate goal, to provide rational tools for the design of improved zeolite-based Brønsted acid catalysts.
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Affiliation(s)
- Céline Chizallet
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Christophe Bouchy
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Kim Larmier
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Gerhard Pirngruber
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
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7
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Zhang X, Strzelecki AC, Cockreham CB, Goncharov VG, Li H, Sun J, Sun H, Guo X, Xu H, Su H, Wang B, Wang Y, Wu D. Thermodynamics of molybdenum trioxide encapsulated in zeolite Y. AIChE J 2021. [DOI: 10.1002/aic.17464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xianghui Zhang
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
| | - Andrew C. Strzelecki
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- Department of Chemistry Washington State University Pullman Washington USA
- Materials Science and Engineering Washington State University Pullman Washington USA
| | - Cody B. Cockreham
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
- Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA
| | - Vitaliy G. Goncharov
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- Department of Chemistry Washington State University Pullman Washington USA
- Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA
| | - Houqian Li
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
| | - Junming Sun
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
| | - Hui Sun
- Petroleum Processing Research Center East China University of Science and Technology Shanghai China
- International Joint Research Center of Green Energy Chemical Engineering East China University of Science and Technology Shanghai China
| | - Xiaofeng Guo
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- Department of Chemistry Washington State University Pullman Washington USA
- Materials Science and Engineering Washington State University Pullman Washington USA
| | - Hongwu Xu
- Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA
| | - Ha Su
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
| | - Baodong Wang
- National Institute of Clean‐and‐Low‐Carbon Energy Beijing China
| | - Yong Wang
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
- Institute for Integrated Catalysis Pacific Northwest National Laboratory Richland Washington USA
| | - Di Wu
- Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Pullman Washington USA
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington USA
- Department of Chemistry Washington State University Pullman Washington USA
- Materials Science and Engineering Washington State University Pullman Washington USA
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8
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Kumar G, Ren L, Pang Y, Li X, Chen H, Gulbinski J, Dauenhauer PJ, Tsapatsis M, Abdelrahman OA. Acid Sites of Phosphorus-Modified Zeosils. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01588] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Gaurav Kumar
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Limin Ren
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Catalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
| | - Yutong Pang
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Xinyu Li
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Han Chen
- Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Jason Gulbinski
- Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Paul J. Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Catalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
- Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, Maryland 20723, United States
- Catalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
| | - Omar A. Abdelrahman
- Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United States
- Catalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
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9
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Shamzhy M, Gil B, Opanasenko M, Roth WJ, Čejka J. MWW and MFI Frameworks as Model Layered Zeolites: Structures, Transformations, Properties, and Activity. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05332] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mariya Shamzhy
- Department of Physical and Macromolecular Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Barbara Gil
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Maksym Opanasenko
- Department of Physical and Macromolecular Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Wieslaw J. Roth
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
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10
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Ahmed K, Inamdar SN, Rohman N, Skelton AA. Acidity constant and DFT-based modelling of pH-responsive alendronate loading and releasing on propylamine-modified silica surface. Phys Chem Chem Phys 2021; 23:2015-2024. [DOI: 10.1039/d0cp04498a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A computational methodology that couples the acidity (Ka) and density functional theory (DFT) calculations has been developed to explain the pH-dependent drug loading on and releasing from mesoporous silica nanoparticles.
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Affiliation(s)
- Khalid Ahmed
- Department of Pharmaceutical Sciences
- University of KwaZulu-Natal
- Durban 4000
- South Africa
| | | | - Nashiour Rohman
- Department of Pharmaceutical Sciences
- University of KwaZulu-Natal
- Durban 4000
- South Africa
| | - Adam A. Skelton
- Department of Pharmaceutical Sciences
- University of KwaZulu-Natal
- Durban 4000
- South Africa
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11
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Chizallet C. Toward the Atomic Scale Simulation of Intricate Acidic Aluminosilicate Catalysts. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01136] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Céline Chizallet
- IFP Energies nouvelles Solaize, Rond-Point de l’Echangeur de Solaize, BP 3, 69360 Solaize, France
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12
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Treps L, Gomez A, de Bruin T, Chizallet C. Environment, Stability and Acidity of External Surface Sites of Silicalite-1 and ZSM-5 Micro and Nano Slabs, Sheets, and Crystals. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05103] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Laureline Treps
- IFP Energies Nouvelles, Rond-point de l’échangeur de Solaize
, 69360 Solaize, France
| | - Axel Gomez
- IFP Energies Nouvelles, Rond-point de l’échangeur de Solaize
, 69360 Solaize, France
- Département de Chimie, École Normale Supérieure, PSL University
, 75005 Paris, France
| | - Theodorus de Bruin
- IFP Energies Nouvelles, 1 et 4 avenue de Bois-Préau,
, 92852 Rueil-Malmaison, France
| | - Céline Chizallet
- IFP Energies Nouvelles, Rond-point de l’échangeur de Solaize
, 69360 Solaize, France
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13
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Selvam E, Parsapur RK, Hernandez-Tamargo CE, de Leeuw NH, Selvam P. Nanostructured zeolite with brain-coral morphology and tailored acidity: a self-organized hierarchical porous material with MFI topology. CrystEngComm 2020. [DOI: 10.1039/d0ce00989j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nano-zeolite with brain-coral morphology formed by self-organization of ultra-small nanospheres, exhibits micro/meso porosity with high surface area, distributed acid sites, and reduced diffusion resistance making it a promising solid acid catalyst.
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Affiliation(s)
- Esun Selvam
- Department of Chemical Engineering
- National Institute of Technology-Trichy
- Tiruchirappalli 620 015
- India
| | - Rajesh K. Parsapur
- National Centre for Catalysis Research and Department of Chemistry
- Indian Institute of Technology-Madras
- Chennai 600 036
- India
| | - Carlos E. Hernandez-Tamargo
- National Centre for Catalysis Research and Department of Chemistry
- Indian Institute of Technology-Madras
- Chennai 600 036
- India
- School of Chemistry
| | - Nora H. de Leeuw
- School of Chemistry
- Cardiff University
- Cardiff CF10 3AT
- UK
- School of Chemistry
| | - Parasuraman Selvam
- National Centre for Catalysis Research and Department of Chemistry
- Indian Institute of Technology-Madras
- Chennai 600 036
- India
- School of Chemical Engineering and Analytical Science
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14
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A Comparative Study of MFI Zeolite Derived from Different Silica Sources: Synthesis, Characterization and Catalytic Performance. Catalysts 2018. [DOI: 10.3390/catal9010013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this paper, a comparative study of MFI zeolite derived from different silica sources is presented. Dry gel conversion (DGC) method is used to synthesize silicalite-1 and ZSM-5 with MFI structure. Two kinds of silica sources with different particle sizes are used during the synthesis of MFI zeolite. The as-prepared samples were characterized by X-ray diffraction (XRD), N2-sorption, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and X-ray fluorescence spectrometer (XRF). From the characterization results, it could be seen that the high-quality coffin-like silicalite-1 was synthesized using silica sphere with particle size of 300 nm as silica source, with crystallization time being shortened to 2 h. The schematic diagram of silicalite-1 formation using silica sources with different particle sizes is summarized. ZSM-5 was obtained by adding Al atoms to raw materials during the synthesis of MFI zeolite. The performance of aqueous phase eugenol hydrodeoxygenation over Pd/C-ZSM-5 catalyst is evaluated.
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15
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Al Soubaihi RM, Furesi G, Saoud KM, Al-Muhtaseb SA, Khatat AE, Delogu LG, Dutta J. Silica and carbon decorated silica nanosheet impact on primary human immune cells. Colloids Surf B Biointerfaces 2018; 172:779-789. [PMID: 30266012 DOI: 10.1016/j.colsurfb.2018.09.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 08/25/2018] [Accepted: 09/10/2018] [Indexed: 02/01/2023]
Abstract
Silica nanosheets (SiO2 NS) are considered to be a promising material in clinical practice for diagnosis and therapy applications. However, an appropriate surface functionalization is essential to guarantee high biocompatibility and molecule loading ability. Although SiO2 NS are chemically stable, its effects on immune systems are still being explored. In this work, we successfully synthesized a novel 2D multilayer SiO2 NS and SiO2 NS coated with carbon (C/SiO2 NS), and evaluated their impact on human Peripheral Blood Mononuclear Cells (PBMCs) and some immune cell subpopulations. We demonstrated that the immune response is strongly dependent on the surface functionalities of the SiO2 NS. Ex vivo experiments showed an increase in biocompatibility of C/SiO2 NS compared to SiO2 NS, resulting in a lowering of hemoglobin release together with a reduction in cellular toxicity and cellular activation. However, none of them are directly involved in the activation of the acute inflammation process with a consequent release of pro-inflammatory cytokines. The obtained results provide an important direction towards the biomedical applications of silica nanosheets, rendering them an attractive material for the development of future immunological therapies.
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Affiliation(s)
- Rola Mohammad Al Soubaihi
- Functional Materials, Department of Applied Physics, The Royal Institute of Technology, School of Engineering Sciences, Isafjordsgatan 22, SE-164 40 Kista Stockholm, Sweden
| | | | - Khaled Mohammad Saoud
- Liberal Arts and Sciences Program, Virginia Commonwealth University in Qatar, P.O. Box 8095, Doha, Qatar.
| | | | - Ahmed El Khatat
- Department of Chemical Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Lucia Gemma Delogu
- University of Sassari, Sassari, 07100, Italy; Fondazione Citta' Della Speranza, Istituto di Ricerca Pediatrica, Padova, 35129, Italy.
| | - Joydeep Dutta
- Functional Materials, Department of Applied Physics, The Royal Institute of Technology, School of Engineering Sciences, Isafjordsgatan 22, SE-164 40 Kista Stockholm, Sweden
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Arce-Molina J, Grau-Crespo R, Lewis DW, Ruiz-Salvador AR. Screening heteroatom distributions in zeotype materials using an effective Hamiltonian approach: the case of aluminogermanate PKU-9. Phys Chem Chem Phys 2018; 20:18047-18055. [DOI: 10.1039/c8cp01369a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We introduce a method to allow the screening of large configurational spaces of heteroatom distributions in zeotype materials.
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Affiliation(s)
- Jorge Arce-Molina
- Institute of Materials Research and Engineering (IMRE)
- University of Havana
- Havana 10400
- Cuba
- Dept. Metallurgy-Chemistry
| | | | - Dewi W. Lewis
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
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Hernandez-Tamargo CE, Roldan A, Ngoepe PE, de Leeuw NH. Periodic modeling of zeolite Ti-LTA. J Chem Phys 2017; 147:074701. [PMID: 28830187 DOI: 10.1063/1.4998296] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have proposed a combination of density functional theory calculations and interatomic potential-based simulations to study the structural, electronic, and mechanical properties of pure-silica zeolite Linde Type A (LTA), as well as two titanium-doped compositions. The energetics of the titanium distribution within the zeolite framework suggest that the inclusion of a second titanium atom with configurations Ti-(Si)0-Ti, Ti-(Si)1-Ti, and Ti-(Si)2-Ti is more energetically favorable than the mono-substitution. Infra-red spectra have been simulated for the pure-silica LTA, the single titanium substitution, and the configurations Ti-(Si)0-Ti and Ti-(Si)2-Ti, comparing against experimental benchmarks where available. The energetics of the direct dissociation of water on these Lewis acid sites indicate that this process is only favored when two titanium atoms form a two-membered ring (2MR) sharing two hydroxy groups, Ti-(OH)2-Ti, which suggests that the presence of water may tune the distribution of titanium atoms within the framework of zeolite LTA. The electronic analysis indicates charge transfer from H2O to the Lewis acid site and hybridization of their electronic states.
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Affiliation(s)
| | - Alberto Roldan
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Phuti E Ngoepe
- Materials Modelling Centre, School of Physical and Mineral Sciences, University of Limpopo, Private Bag X1106 Sovenga, South Africa
| | - Nora H de Leeuw
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
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Density functional theory study of the zeolite-mediated tautomerization of phenol and catechol. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2016.12.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Fischer M, Evers FO, Formalik F, Olejniczak A. Benchmarking DFT-GGA calculations for the structure optimisation of neutral-framework zeotypes. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-2014-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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