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Collados CC, Huber C, Söllner J, Grass JP, Inayat A, Durdyyev R, Smith AS, Wisser D, Hartmann M, Thommes M. Assessment of Hydrophilicity/Hydrophobicity in Mesoporous Silica by Combining Adsorption, Liquid Intrusion, and Solid-State NMR Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:12853-12867. [PMID: 38861921 DOI: 10.1021/acs.langmuir.3c03516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
We have developed a comprehensive strategy for quantitatively assessing the hydrophilicity/hydrophobicity of nanoporous materials by combining advanced adsorption studies, novel liquid intrusion techniques, and solid-state NMR spectroscopy. For this, we have chosen a well-defined system of model materials, i.e., the highly ordered mesoporous silica molecular sieve SBA-15 in its pristine state and functionalized with different amounts of trimethylsilyl (TMS) groups, allowing one to accurately tailor the surface chemistry while maintaining the well-defined pore structure. For an absolute quantification of the trimethylsilyl group density, quantitative 1H solid-state NMR spectroscopy under magic angle spinning was employed. A full textural characterization of the materials was obtained by high-resolution argon 87 K adsorption, coupled with the application of dedicated methods based on nonlocal-density functional theory (NLDFT). Based on the known texture of the model materials, we developed a novel methodology allowing one to determine the effective contact angle of water adsorbed on the pore surfaces from complete wetting to nonwetting, constituting a powerful parameter for the characterization of the surface chemistry inside porous materials. The surface chemistry was found to vary from hydrophilic to hydrophobic as the TMS functionalization content was increased. For wetting and partially wetting surfaces, pore condensation of water is observed at pressures P smaller than the bulk saturation pressure p0 (i.e., at p/p0 < 1) and the effective contact angle of water on the pore walls could be derived from the water sorption isotherms. However, for nonwetting surfaces, pore condensation occurs at pressures above the saturation pressure (i.e., at p/p0 > 1). In this case, we investigated the pore filling of water (i.e., the vapor-liquid phase transition) by the application of a novel, liquid water intrusion/extrusion methodology, allowing one to derive the effective contact angle of water on the pore walls even in the case of nonwetting. Complementary molecular simulations provide density profiles of water on pristine and TMS-grafted silica surfaces (mimicking the tailored, functionalized experimental silica surfaces), which allow for a molecular view on the water adsorbate structure. Summarizing, we present a comprehensive and reliable methodology for quantitatively assessing the hydrophilicity/hydrophobicity of siliceous nanoporous materials, which has the potential to optimize applications in heterogeneous catalysis and separation (e.g., chromatography).
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Affiliation(s)
- Carlos Cuadrado Collados
- Institution of Separation Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Christoph Huber
- Erlangen Center for Interface Research and Catalysis (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Jakob Söllner
- Institution of Separation Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Jan-Paul Grass
- Institute of Chemical Reaction Engineering (CRT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Alexandra Inayat
- Institute of Chemical Reaction Engineering (CRT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Rustam Durdyyev
- PULS Group, Institute for Theoretical Physics, Centre for Computational Advanced Materials and Processes, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstraße 4, Erlangen 91058, Germany
| | - Ana-Suncana Smith
- PULS Group, Institute for Theoretical Physics, Centre for Computational Advanced Materials and Processes, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstraße 4, Erlangen 91058, Germany
| | - Dorothea Wisser
- Erlangen Center for Interface Research and Catalysis (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Martin Hartmann
- Erlangen Center for Interface Research and Catalysis (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
| | - Matthias Thommes
- Institution of Separation Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, Erlangen 91058, Germany
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Abstract
Detailed analysis of textural properties, e.g., pore size and connectivity, of nanoporous materials is essential to identify correlations of these properties with the performance of gas storage, separation, and catalysis processes. The advances in developing nanoporous materials with uniform, tailor-made pore structures, including the introduction of hierarchical pore systems, offer huge potential for these applications. Within this context, major progress has been made in understanding the adsorption and phase behavior of confined fluids and consequently in physisorption characterization. This enables reliable pore size, volume, and network connectivity analysis using advanced, high-resolution experimental protocols coupled with advanced methods based on statistical mechanics, such as methods based on density functional theory and molecular simulation. If macro-pores are present, a combination of adsorption and mercury porosimetry can be useful. Hence, some important recent advances in understanding the mercury intrusion/extrusion mechanism are discussed. Additionally, some promising complementary techniques for characterization of porous materials immersed in a liquid phase are introduced.
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Affiliation(s)
- M Thommes
- Institute of Separation Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen 91058, Germany;
| | - C Schlumberger
- Institute of Separation Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen 91058, Germany;
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Uhlig H, Zieger S, Bluhm C, Münster T, Klöss G, Krause-Rehberg R, Enke D. Charakterisierung von Kieselgelen mit bimodaler Porenstruktur mittels Positronenlebensdauer-Spektroskopie. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201500134] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Müllner T, Unger KK, Tallarek U. Characterization of microscopic disorder in reconstructed porous materials and assessment of mass transport-relevant structural descriptors. NEW J CHEM 2016. [DOI: 10.1039/c5nj03346b] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Galarneau A, Sachse A, Said B, Pelisson CH, Boscaro P, Brun N, Courtheoux L, Olivi-Tran N, Coasne B, Fajula F. Hierarchical porous silica monoliths: A novel class of microreactors for process intensification in catalysis and adsorption. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.05.017] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yang K, Chen B, Zhu L. Graphene-coated materials using silica particles as a framework for highly efficient removal of aromatic pollutants in water. Sci Rep 2015; 5:11641. [PMID: 26119007 PMCID: PMC4484242 DOI: 10.1038/srep11641] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 06/01/2015] [Indexed: 11/24/2022] Open
Abstract
The substantial aggregation of pristine graphene nanosheets decreases its powerful adsorption capacity and diminishes its practical applications. To overcome this shortcoming, graphene-coated materials (GCMs) were prepared by loading graphene onto silica nanoparticles (SiO2). With the support of SiO2, the stacked interlamination of graphene was held open to expose the powerful adsorption sites in the interlayers. The adsorption of phenanthrene, a model aromatic pollutant, onto the loaded graphene nanosheets increased up to 100 fold compared with pristine graphene at the same level. The adsorption of GCMs increased with the loading amount of the graphene nanosheets and dramatically decreased with the introduction of oxygen-containing groups in the graphene nanosheets. The highly hydrophobic effect and the strong π-π stacking interactions of the exposed graphene nanosheets contributed to their superior adsorption of GCMs. An unusual GCM peak adsorption coefficient (Kd) was observed with the increase in sorbate concentration. The sorbate concentration at peak Kd shifted to lower values for the reduced graphene oxide and graphene relative to the graphene oxide. Therefore, the replacement of water nanodroplets attached to the graphene nanosheets through weak non-hydrogen bonding with phenanthrene molecules via strong π-π stacking interactions is hypothesized to be an additional adsorption mechanism for GCMs.
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Affiliation(s)
- Kaijie Yang
- 1] Department of Environmental Science, Zhejiang University, Hangzhou 310058, China [2] Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Baoliang Chen
- 1] Department of Environmental Science, Zhejiang University, Hangzhou 310058, China [2] Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Lizhong Zhu
- 1] Department of Environmental Science, Zhejiang University, Hangzhou 310058, China [2] Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
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Chen S, Sun S, Zhang X, Han Q, Yang L, Ding M. Synthesis of large-pore mesostructured cellular foam silica spheres for the adsorption of biomolecules. J Sep Sci 2014; 37:2411-7. [DOI: 10.1002/jssc.201400154] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 05/04/2014] [Accepted: 06/02/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Sha Chen
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry; Tsinghua University; Beijing China
| | - Shaoai Sun
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry; Tsinghua University; Beijing China
| | - Xiaoqiong Zhang
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry; Tsinghua University; Beijing China
| | - Qiang Han
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry; Tsinghua University; Beijing China
| | - Liu Yang
- State Key Laboratory of NBC Protection for Civilian; Beijing China
| | - Mingyu Ding
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry; Tsinghua University; Beijing China
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Ali I, AL-Othman ZA, Nagae N, Gaitonde VD, Dutta KK. Recent trends in ultra-fast HPLC: New generation superficially porous silica columns. J Sep Sci 2012. [DOI: 10.1002/jssc.201200454] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Imran Ali
- Department of Chemistry; Jamia Millia Islamia (Central University); Jamia Nagar; New Delhi; India
| | - Zeid A. AL-Othman
- Department of Chemistry College of Science; King Saud University; Riyadh; Kingdom of Saudi Arabia
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Unger KK, Liapis AI. Adsorbents and columns in analytical high-performance liquid chromatography: a perspective with regard to development and understanding. J Sep Sci 2012; 35:1201-12. [PMID: 22555863 DOI: 10.1002/jssc.201200042] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/09/2012] [Accepted: 02/14/2012] [Indexed: 11/09/2022]
Abstract
A brief historical survey is presented on the evaluation of silica adsorbents in analytical HPLC. The theory of analytical HPLC is mostly still being based on the height equivalent to a theoretical plate concept and the van Deemter equation that was derived from gas phase adsorption involving a linear adsorption isotherm and fast mass transfer kinetics. One can obviously wonder whether the use of the van Deemter equation is relevant and valid for the evaluation of the performance of HPLC systems, where most often the liquid solutes involve charged molecules in electrolytes and in very many cases the adsorbates are macromolecules having diffusion coefficients of small magnitude. Instead of the van Deemter equation, a multi-scale modelling approach that involves microscopic and macroscopic dynamic non-linear mass-transfer-rate models should be employed. Furthermore, advanced experimental methods for the characterisation of porous media and the distribution of the density of immobilised active sites (e.g., ligands) on surfaces as well as microscopic pore-network modelling and molecular dynamics modelling and simulation methods could be used for the design of novel adsorbents whose porous structures and immobilised active sites would provide effective mass transport and adsorption rates for realising efficient separations as well as high dynamic capacities when larger throughputs are required.
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Affiliation(s)
- Klaus K Unger
- Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg University, Mainz, Germany.
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Ali I, AL-Othman ZA, Al-Za'abi M. Superficially porous particles columns for super fast HPLC separations. Biomed Chromatogr 2012; 26:1001-8. [DOI: 10.1002/bmc.2690] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Revised: 12/04/2011] [Accepted: 12/04/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Imran Ali
- Department of Chemistry; Jamia Millia Islamia (Central University); New Delhi; 110025; India
| | - Zeid A. AL-Othman
- Department of Chemistry; College of Science, King Saud University; Riyadh; 11451; Kingdom of Saudi Arabia
| | - Mohammed Al-Za'abi
- Department of Pharmacology and Clinical Pharmacy; College of Medicine, Sultan Qaboos University; PO Box 35; Post Code 123; Muscat; Oman
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Caldas SS, Costa FP, Primel EG. Validation of method for determination of different classes of pesticides in aqueous samples by dispersive liquid–liquid microextraction with liquid chromatography–tandem mass spectrometric detection. Anal Chim Acta 2010; 665:55-62. [DOI: 10.1016/j.aca.2010.03.004] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Revised: 03/02/2010] [Accepted: 03/06/2010] [Indexed: 11/24/2022]
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Wernert V, Bouchet R, Denoyel R. Influence of Molecule Size on Its Transport Properties through a Porous Medium. Anal Chem 2010; 82:2668-79. [DOI: 10.1021/ac902858b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Véronique Wernert
- Universités d’Aix-Marseille I, II et III-CNRS, UMR 6264, Laboratoire Chimie Provence, Equipe Matdiv, Centre Saint Jérôme, F-13397 Marseille Cedex 20, France
| | - Renaud Bouchet
- Universités d’Aix-Marseille I, II et III-CNRS, UMR 6264, Laboratoire Chimie Provence, Equipe Matdiv, Centre Saint Jérôme, F-13397 Marseille Cedex 20, France
| | - Renaud Denoyel
- Universités d’Aix-Marseille I, II et III-CNRS, UMR 6264, Laboratoire Chimie Provence, Equipe Matdiv, Centre Saint Jérôme, F-13397 Marseille Cedex 20, France
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Barrande M, Beurroies I, Denoyel R, Tatárová I, Gramblička M, Polakovič M, Joehnck M, Schulte M. Characterisation of porous materials for bioseparation. J Chromatogr A 2009; 1216:6906-16. [DOI: 10.1016/j.chroma.2009.07.075] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 07/15/2009] [Accepted: 07/27/2009] [Indexed: 10/20/2022]
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