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Hill EH. Investigating Solvent-Induced Aggregation in Edge-Functionalized Layered Silicates via All-Atom Molecular Dynamics Simulations. J Phys Chem B 2023; 127:8066-8073. [PMID: 37672482 DOI: 10.1021/acs.jpcb.3c04432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Molecular dynamics simulations can provide the means to visualize and understand the role of intermolecular interactions in the mechanisms involved in molecular aggregation. Along these lines, simulations can allow the study of how surface chemical modifications can influence nanomaterial assembly at the molecular level. Layered silicate clays have been of significant interest for some time, particularly with regard to their use in organic/inorganic nanocomposites. However, despite numerous reports on the covalent linkage of organic moieties via silanol condensation, the theoretical understanding of these systems has heretofore been limited to noncovalent interactions, specifically ionic interactions at the charged basal surfaces. Herein, a model for edge-functionalized layered aluminosilicate clay, based on the siloxane linkage, is presented. In addition to reproducing experimentally observed degrees of molecular aggregation of clay-linked perylene diimide derivatives with different terminal functional groups as a function of solvent composition, a molecular-level understanding of the role of van der Waals interactions and hydrogen bonding of the different end-groups on the aggregation state in different water/N,N-dimethylformamide mixtures is obtained. The reported model provides a means to simulate organic moieties covalently bound to the layered silicate edge, which will enable future simulations of nanocomposites and organic/inorganic hybrids based on this system.
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Affiliation(s)
- Eric H Hill
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
- The Hamburg Center for Ultrafast Imaging (CUI), Luruper Chausee 149, Hamburg 22761, Germany
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Jatav S, Herber M, Xiang H, Hill EH. Layered Double Hydroxide-Bismuth Molybdate Hybrids toward Water Remediation via Selective Adsorption of Anionic Species. ACS APPLIED MATERIALS & INTERFACES 2022; 14:51921-51930. [PMID: 36355751 DOI: 10.1021/acsami.2c14979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The steady release of anthropogenic toxins into the biosphere is compromising water security globally. Herein, CoAl layered double hydroxide, a clay-like layered material with a cationic surface charge, was organically modified and used to template the growth of Bi2MoO6. The resulting nanohybrid selectively removed the anionic dye methyl orange from aqueous solution and showed an enhancement of greater than 300% in the maximum adsorptivity (1.95 mmol/g) compared to modified CoAl layered double hydroxide (0.42 mmol/g). Interestingly, the observed improvement in adsorption occurs without any significant increase in the surface area of the hybrids. Furthermore, these hybrids exhibit increased broadband visible light absorption, and their photoactivity is slightly improved compared to CoAl layered double hydroxide. This study demonstrates that composites of clay-like materials with Aurivillius oxides are promising sorbent materials for water decontamination and photocatalytic antifouling membranes and shows that the synthetic strategy that was first established with an anionic layered silicate nanoclay can be generalized to other ionic layered materials.
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Affiliation(s)
- Sanjay Jatav
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Marcel Herber
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Hongxiao Xiang
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Eric H Hill
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chausee 149, 22761 Hamburg, Germany
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Shunmughananthan B, Dheivasigamani T, Sthevan Kovil Pitchai J, Periyasamy S. Performance comparison of distinct bismuth molybdate single phases for asymmetric supercapacitor applications. Dalton Trans 2022; 51:15579-15592. [PMID: 36169008 DOI: 10.1039/d2dt02092k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The enticing features of metal molybdates make them an attractive candidate for energy storage systems. This report describes the synthesis of three distinct single-phase bismuth molybdates (Bi2MoxOy; α-Bi2Mo3O12, β-Bi2Mo2O9, and γ-Bi2MoO6) using the gel matrix particle growth method and their application in high-performance asymmetric supercapacitors. The single phase and purity of the synthesized Bi2MoxOy particles were confirmed by X-ray diffraction (XRD) and further verified by Raman analysis. The UV-visible spectra show the electronic and optical behaviours of the as-synthesized α, β, and γ Bi2MoxOy. The morphologies of the as-synthesized three different Bi2MoxOy phases were analysed using scanning electron microscopy (SEM). The particle formation was further investigated by transmission electron microscopy (TEM), and the interplanar spacings of the Bi2MoxOy phases were in accordance with the planes. The surface area and pore volume of the prepared samples were analysed using Brunauer-Emmett-Teller (BET) analysis. The electrochemical properties of the products were confirmed by various tests, including cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS) in 3 M KOH. Among the three phases, α-Bi2Mo3O12 exhibits a huge specific capacitance (Cs) of 714 F g-1 at a current density of 1 A g-1. Furthermore, it displays an admirable cycling stability of 86.55% after 5000 cycles. The chosen α-Bi2Mo3O12 electrode possesses an increased energy density of 47.5 W h kg-1 at 1 A g-1 with a capacitive retention rate of 71.90% at 5 A g-1 after 10 000 cycles. A remarkable electrochemical performance of Bi2Mo3O12 with an exceptional power density of 750 W kg-1 was observed for the prepared asymmetric device. Bismuth molybdate's notable performance indicates that it can be an active material for energy storage applications.
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Affiliation(s)
- Bagavathy Shunmughananthan
- Nano-crystal Design and Application Lab (n-DAL), Department of Physics, PSG Institute of Technology and Applied Research, Coimbatore-641062, Tamil Nadu, India.
| | - Thangaraju Dheivasigamani
- Nano-crystal Design and Application Lab (n-DAL), Department of Physics, PSG Institute of Technology and Applied Research, Coimbatore-641062, Tamil Nadu, India.
| | - Jesman Sthevan Kovil Pitchai
- Solid State Ionics Lab, PG & Research Department of Physics, Thanthai Periyar Government Arts and Science College (Autonomous), (Affiliated to Bharathidasan University), Tiruchirappalli-620023, Tamil Nadu, India
| | - Sivakumar Periyasamy
- Solid State Ionics Lab, PG & Research Department of Physics, Thanthai Periyar Government Arts and Science College (Autonomous), (Affiliated to Bharathidasan University), Tiruchirappalli-620023, Tamil Nadu, India
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Jatav S, Herber M, Xiang H, Hill EH. Surface-Encapsulated Bismuth Molybdate-Layered Silicate Hybrids as Sorbents for Photocatalytic Filtration Membranes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:22790-22798. [PMID: 35015519 DOI: 10.1021/acsami.1c20503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Groundwater is being depleted globally at an average rate of more than one meter per year, during a period when more than a quarter of the human population has no access to potable water. Aside from overexploitation, freshwater security is also threatened by climate change and chemical pollution. The contamination of surface and groundwater by industrial substances is also undermining the vitality of ecosystems. It was previously shown that {100}-faceted Bi2MoO6-Laponite hybrids effectively bind and photodegrade molecular species, aiding in the decontamination of water. In this study, the encapsulation of Bi2MoO6-Laponite particles with the polymers butyl acrylate and styrene further enhanced adsorption of methylene blue by 31.4%, with a specific adsorption capacity of 192 μmol/g. The polymer-particle composites were deposited to form membranes and their efficacies in water filtration and photodegradation were examined. Among the different surface modifications examined, the highest dye sorption was obtained by butyl acrylate and styrene (3:2) with a 5 mol % cross-linker. This study provides a method for enhancing the molecular adsorption of composite particles used in membranes capable of multiple cycles of adsorption and photodegradation, advancing the application of such systems to water filtration.
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Affiliation(s)
- Sanjay Jatav
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
| | - Marcel Herber
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
| | - Hongxiao Xiang
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
| | - Eric H Hill
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
- The Hamburg Center for Ultrafast Imaging (CUI), Luruper Chausee 149, Hamburg 22761, Germany
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Gui MM, Lee WC, Putri LK, Kong XY, Tan LL, Chai SP. Photo-Driven Reduction of Carbon Dioxide: A Sustainable Approach Towards Achieving Carbon Neutrality Goal. FRONTIERS IN CHEMICAL ENGINEERING 2021. [DOI: 10.3389/fceng.2021.744911] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The photo-driven reduction of carbon dioxide (CO2) into green and valuable solar fuels could be a promising solution to simultaneously address energy- and environmental-related problems. This approach could play an integral role in achieving a sustainable energy economy by closing the carbon cycle and allowing the storage and transportation of intermittent solar energy within the chemical bonds of hydrocarbon molecules. This Perspective discusses the latest technological advancements in photo-driven CO2 conversion via various pathways, namely photocatalysis, photoelectrocatalysis and photovoltaic-integrated systems. In addition to providing an outlook on unresolved issues concerning the said technologies, this Perspective also spotlights new trends and strategies in the structural engineering of materials to meet the demands for prominent CO2 photoreduction activity as well as spearhead the ground-breaking advances in the field that lead to the translation of CO2 photo-driven technologies from the laboratory to industrial-scale applications.
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Osajima JA, Silva LAL, Silva AAL, Rios MAS, De Carvalho TAF, Araújo AR, Silva DA, Magalhães JL, Matos JME, Silva-Filho EC. Facile synthesis of H-CoMoO4 nanosheets for antibacterial approaches. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01925-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sun C, Zhao Z, Fan H, Chen Y, Liu X, Cao J, Lang J, Wei M, Liu H, Yang L. Oxygen vacancy induced electron traps in tungsten doped Bi 2MoO 6 for enhanced photocatalytic performance. CrystEngComm 2021. [DOI: 10.1039/d1ce00868d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
As the concentration of the W dopant increased in the Bi2Mo1−xWxO6 nanosheets, the density of the oxygen vacancies became higher, which served as electron trap centers to lower the recombination rate and enhance the photocatalytic performance.
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Affiliation(s)
- Chang Sun
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
| | - Zitong Zhao
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
| | - Hougang Fan
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Yanli Chen
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Xiaoyan Liu
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Jian Cao
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Jihui Lang
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Maobin Wei
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Huilian Liu
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
| | - Lili Yang
- College of Physics, Jilin Normal University, Siping 136000, PR China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, PR China
- National Demonstration Centre for Experimental Physics Education, Jilin Normal University, Siping, 136000, PR China
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