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Kumbhare LB, Udayan APM, Singla H, Sawant SN, Ruz P, Wadawale A, Bahadur J. Hydrogen-bonded linear chain assemblies of palladium(II)-selenoether complexes: solid state aggregates as templates for nano-structural Pd 17Se 15 leading to efficient electrocatalytic activity. Dalton Trans 2023. [PMID: 37997778 DOI: 10.1039/d3dt02170j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
A analogous series of 2-(3,5-dimethylpyrazol-1-yl)phenyl substituted selenoether complexes of palladium [PdCl2(RSeC6H4dmpz)]; (R = CH2COOH (1), CH2CH2COOH (2), and CH2CH2OH (3); dmpz = dimethylpyrazole) were ably synthesized in a facile manner and exhaustively characterized. Insight into molecular structures of these complexes was keenly probed through single crystal X-ray diffraction (XRD) analysis, unfolding the structural scaffolds and laying into molecular aggregation, availed through hydrogen bonding interactions borne out of tethered protic groups. The complexes were converted to capping free palladium selenide (Pd17Se15) nanoparticles through pyrolysis and evaluated for their electrocatalytic efficacy towards the hydrogen evolution reaction (HER), the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) in alkaline medium. In an alkaline medium, PSNP1 (Pd17Se15) obtained from the hydrogen bonded aggregate of complex PdCl2L1 (1) produced good HER activity. PSNP1 had a little decrease in current density after 300 continuous cycles, which proves that the catalyst presents high stability in the recycling process. For the electrocatalytic oxidation of CH3OH, the electrocatalytic rate constant (k) obtained was 0.3 × 103 cm3 mol-1 s-1.
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Affiliation(s)
| | - Anu Prathap M Udayan
- Department of Metallurgical and Materials Engineering, Punjab Engineering College (Deemed to be University), Sector-12, Chandigarh 160012, India
| | - Hardik Singla
- Department of Metallurgical and Materials Engineering, Punjab Engineering College (Deemed to be University), Sector-12, Chandigarh 160012, India
| | - Shilpa N Sawant
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Priyanka Ruz
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Amey Wadawale
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Jitendra Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Liyanaarachchi H, Thambiliyagodage C, Lokuge H, Vigneswaran S. Kinetics and Thermodynamics Study of Methylene Blue Adsorption to Sucrose- and Urea-Derived Nitrogen-Enriched, Hierarchically Porous Carbon Activated by KOH and H 3PO 4. ACS OMEGA 2023; 8:16158-16173. [PMID: 37179646 PMCID: PMC10173434 DOI: 10.1021/acsomega.3c00339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023]
Abstract
Hierarchically porous nitrogen-enriched carbon materials synthesized by polymerization of sucrose and urea (SU) were activated by KOH and H3PO4 (SU-KOH and SU-H3PO4, respectively). Characterization was undertaken and the synthesized materials were tested for their ability to adsorb methylene blue (MB). Scanning electron microscopic images along with the Brunauer-Emmett-Teller (BET) surface area analysis revealed the presence of a hierarchically porous system. X-ray photoelectron spectroscopy (XPS) confirms the surface oxidation of SU upon activation with KOH and H3PO4. The best conditions for removing dyes utilizing both activated adsorbents were determined by varying the pH, contact time, adsorbent dosage, and dye concentration. Adsorption kinetics were evaluated, and the adsorption of MB followed second-order kinetics, suggesting the chemisorption of MB to both SU-KOH and SU-H3PO4. Times taken to reach the equilibrium by SU-KOH and SU-H3PO4 were 180 and 30 min, respectively. The adsorption isotherm data were fitted to the Langmuir, Freundlich, Temkin, and Dubinin models. Data were best described by the Temkin isotherm model for SU-KOH and the Freundlich isotherm model for SU-H3PO4. Thermodynamics of the adsorption of MB to the adsorbent was determined by varying the temperature in the range of 25-55 °C. Adsorption of MB increased with increasing temperature, suggesting that the adsorption process is endothermic. The highest adsorption capacities of SU-KOH and SU-H3PO4 (1268 and 897 mg g-1, respectively) were obtained at 55 °C. Synthesized adsorbents were effective in removing MB for five cycles with some loss in activity. The results of this study show that SU activated by KOH and H3PO4 are environmentally benign, favorable, and effective adsorbents for MB adsorption.
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Affiliation(s)
- Heshan Liyanaarachchi
- Faculty
of Humanities and Sciences, Sri Lanka Institute
of Information Technology, New Kandy Road, Malabe 10115, Sri Lanka
| | - Charitha Thambiliyagodage
- Faculty
of Humanities and Sciences, Sri Lanka Institute
of Information Technology, New Kandy Road, Malabe 10115, Sri Lanka
| | - Hasindhi Lokuge
- College
of Chemical Sciences, Institute of Chemistry
Ceylon, Rajagiriya, CO 10107, Sri Lanka
| | - Saravanamuthu Vigneswaran
- Faculty
of Engineering and Information Technology, University of Technology Sydney, P.O.
Box 123, Broadway, NSW 2007, Australia
- Faculty
of Sciences & Technology (RealTek), Norwegian University of Life Sciences, P.O. Box 5003, Ås N-1432, Norway
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Ali TH, Mandal AM, Heidelberg T, Hussen RSD. Sugar based cationic magnetic core-shell silica nanoparticles for nucleic acid extraction. RSC Adv 2022; 12:13566-13579. [PMID: 35530382 PMCID: PMC9069700 DOI: 10.1039/d2ra01139e] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 04/19/2022] [Indexed: 01/09/2023] Open
Abstract
Nucleic acid (NA) extraction is an essential step in molecular testing for a wide range of applications. Conventional extraction protocols usually suffer from time consuming removal of non-nucleic acid impurities. In this study, a new magnetic nanoparticle (MNP) is presented to simplify the NA extraction. A core-shell design, comprising of a ferromagnetic core coated with mesoporous silica, forms the basis of the functional nanoparticle. Chemical functionalization of the silica coating includes a multistep synthesis, in which an activated nanoparticle is coupled with a triethylene glycol spaced glycosyl imidazole. The molecular design aims for charge interactions between the imidazolium-based positive nanoparticle surface and nucleic acids, with specific hydrogen bonding between the surface bonded carbohydrate and nucleic acid targets to ensure nucleic acid selectivity and avoid protein contamination. Two different carbohydrates, differing in molecular size, were selected to compare the efficiency in terms of NA extraction. A triethylene glycol spacer provides sufficient flexibility to remove particle surface constraints for the interaction. The Brunauer-Emmett-Teller (BET) analysis shows a significantly larger surface area for the disaccharide-based particles NpFeSiImMalt (∼181 m2 g-1) compared to the monosaccharide analogue NpFeSiImGlc (∼116 m2 g-1) at small particles sizes (range ∼ 15 nm) and sufficient magnetization (29 emu g-1) for easy isolation by an external magnetic field. The particles enabled a high DNA particle loading ratio of 30-45 wt% (MNP/DNA ratio), reflecting an efficient extraction process. A high desorption rate (7 min) with more than 86% of unchanged DNA loading was recorded, indicating low damage to the target extract.
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Affiliation(s)
- Tammar Hussein Ali
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Al-Muthanna University 66001 Samawah Al Muthanna Iraq
- Molecular Design and Synthesis, Department of Chemistry, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Amar Mousa Mandal
- College of Basic Education, Science Department, Al-Muthanna University 66001 Samawah Al Muthanna Iraq
| | - Thorsten Heidelberg
- Chemistry Department, Faculty of Science, University of Malaya 50603 Kuala Lumpur Malaysia
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Lombardi TN, Schaeperkoetter JC, Albesa A, Wexler C. Adsorption-Induced Expansion of Graphene Oxide Frameworks with Covalently Bonded Benzene-1,4-diboronic Acid: Numerical Studies. ACS OMEGA 2022; 7:11980-11987. [PMID: 35449911 PMCID: PMC9016881 DOI: 10.1021/acsomega.2c00151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Graphene oxide frameworks (GOFs) are interesting adsorbent materials with well-defined slit-shaped pores of almost monodisperse separation of ∼1 nm between graphene-like layers; however, the exact nature of the structure has remained undetermined. Recently, GOFs were observed to swell monotonically upon the adsorption of methane and xenon under supercritical conditions. Here, we present the results of molecular dynamics simulations of the adsorption of methane and xenon for various proposed GOF structures based upon force fields based on ab initio B3LYP density functional theory calculations. The simulations reproduce well both the adsorption isotherms and the expansion of the interlayer spacing for methane and xenon for a model of GOFs formed by covalently bonded benzene-1,4-diboronic acid oriented at quasirandom angles with respect to the graphene layers.
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Affiliation(s)
- Todd N. Lombardi
- Department
of Physics and Astronomy, University of
Missouri, Columbia, Missouri 65211, United States
| | - Joseph C. Schaeperkoetter
- Department
of Physics and Astronomy, University of
Missouri, Columbia, Missouri 65211, United States
- University
of Missouri Research Reactor, Columbia, Missouri 65211, United States
- Kazuo
Inamori School of Engineering, Alfred University, Alfred, New York 14802, United States
| | - Alberto Albesa
- Department
of Physics and Astronomy, University of
Missouri, Columbia, Missouri 65211, United States
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas,
Departamento de Química, Universidad
Nacional de La Plata, La Plata 1900, Argentina
| | - Carlos Wexler
- Department
of Physics and Astronomy, University of
Missouri, Columbia, Missouri 65211, United States
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Iakunkov A, Talyzin AV. Swelling properties of graphite oxides and graphene oxide multilayered materials. NANOSCALE 2020; 12:21060-21093. [PMID: 33084722 DOI: 10.1039/d0nr04931j] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Graphite oxide (GtO) and graphene oxide (GO) multilayered laminates are hydrophilic materials easily intercalated by water and other polar solvents. By definition, an increase in the volume of a material connected to the uptake of a liquid or vapour is named swelling. Swelling is a property which defines graphite oxides and graphene oxides. Less oxidized materials not capable of swelling should be named oxidized graphene. The infinite swelling of graphite oxide yields graphene oxide in aqueous dispersions. Graphene oxide sheets dispersed in a polar solvent can be re-assembled into multilayered structures and named depending on applications as films, papers or membranes. The multilayered GO materials exhibit swelling properties which are mostly similar to those of graphite oxides but not identical and in some cases surprisingly different. Swelling is a key property of GO materials in all applications which involve the sorption of water/solvents from vapours, immersion of GO into liquid water/solvents and solution based chemical reactions. These applications include sensors, sorption/removal of pollutants from waste waters, separation of liquid and gas mixtures, nanofiltration, water desalination, water-permeable protective coatings, etc. Swelling defines the distance between graphene oxide sheets in solution-immersed GO materials and the possibility for penetration of ions and molecules inside of interlayers. A high sorption capacity of GO towards many molecules and cations is defined by swelling which makes the very high surface area of GO accessible. GtO and GO swelling is a surprisingly complex phenomenon which is manifested in a variety of different ways. Swelling is strongly different for materials produced using the most common Brodie and Hummers oxidation procedures; it depends on the degree of oxidation, ad temperature and pressure conditions. The value of the GO interlayer distance is especially important in membrane applications. Diffusion of solvent molecules and ions is defined by the size of "permeation channels" provided by the swelled GO structure. According to extensive studies performed over the last decade the exact value of the inter-layer distance in swelled GO depends on the nature of solvent, temperature and pressure conditions, and the pH and concentration of solutions and exhibits pronounced aging effects. This review provides insight into the fundamental swelling properties of multilayered GO and demonstrates links to advanced applications of these materials.
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Affiliation(s)
- Artem Iakunkov
- Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
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