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Rosales-Reina B, Cruz-Quesada G, Pujol P, Reinoso S, Elosúa C, Arzamendi G, López-Ramón MV, Garrido JJ. Determination of hazardous vapors from the thermal decomposition of organochlorinated silica xerogels with adsorptive properties. ENVIRONMENTAL RESEARCH 2024; 256:119247. [PMID: 38815719 DOI: 10.1016/j.envres.2024.119247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/19/2024] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
The incorporation of organic groups into sol-gel silica materials is known to have a noticeable impact on the properties and structure of the resulting xerogels due to the combination of the properties inherent to the organic fragments (functionality and flexibility) with the mechanical and structural stability of the inorganic matrix. However, the reduction of the inorganic content in the materials could be detrimental to their thermal stability properties, limiting the range of their potential applications. Therefore, this work aims to evaluate the thermal stability of hybrid inorganic-organic silica xerogels prepared from mixtures of tetraethoxysilane and organochlorinated triethoxysilane precursors. To this end, a series of four materials with a molar percentage of organochlorinated precursor fixed at 10%, but differing in the type of organic group (chloroalkyls varying in the alkyl-chain length and chlorophenyl), has been selected as model case study. The gases and vapors released during the thermal decomposition of the samples under N2 atmosphere have been analyzed and their components determined and quantified using a thermogravimetric analyzer coupled to a Fourier-transform infrared spectrophotometer and to a gas chromatography-mass spectrometry unit. These analyses have allowed to identify up to three different thermal events for the pyrolysis of the organochlorinated xerogel materials and to elucidate the reaction pathways associated with such processes. These mechanisms have been found to be strongly dependent on the specific nature of the organic group.
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Affiliation(s)
- Beatriz Rosales-Reina
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Guillermo Cruz-Quesada
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Pablo Pujol
- Unidad Científico Técnica de Apoyo a La Investigación (UCTAI), Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Santiago Reinoso
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - César Elosúa
- Institute of Smart Cities (ISC), Departamento de Ingeniería Eléctrica, Electrónica y de Comunicación, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Gurutze Arzamendi
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - María Victoria López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071, Jaén, Spain.
| | - Julián J Garrido
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
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Rosales-Reina B, Cruz-Quesada G, Padilla-Postigo N, Irigoyen-Razquin M, Alonso-Martínez E, López-Ramón MV, Espinal-Viguri M, Garrido JJ. Tunability of Hybrid Silica Xerogels: Surface Chemistry and Porous Texture Based on the Aromatic Precursor. Gels 2023; 9:gels9050382. [PMID: 37232974 DOI: 10.3390/gels9050382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 05/27/2023] Open
Abstract
The interest in new materials with specific properties has increased because they are essential for the environmental and technological needs of our society. Among them, silica hybrid xerogels have emerged as promising candidates due to their simple preparation and tunability: when they are synthesised, depending on the organic precursor and its concentration, their properties can be modulated, and thus, it is possible to prepare materials with à la carte porosity and surface chemistry. This research aims to design two new series of silica hybrid xerogels by co-condensation of tetraethoxysilane (TEOS) with triethoxy(p-tolyl)silane (MPhTEOS) or 1,4-bis(triethoxysilyl)benzene (Ph(TEOS)2 and to determine their chemical and textural properties based on a variety of characterisation techniques (FT-IR, 29Si NMR, X-ray diffraction and N2, CO2 and water vapour adsorption, among others). The information gathered from these techniques reveals that depending on the organic precursor and its molar percentage, materials with different porosity, hydrophilicity and local order are obtained, evidencing the easy modulation of their properties. The ultimate goal of this study is to prepare materials suitable for a variety of applications, such as adsorbents for pollutants, catalysts, films for solar cells or coatings for optic fibre sensors.
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Affiliation(s)
- Beatriz Rosales-Reina
- Department of Science, Institute for Advanced Materials and Mathematics (INAMAT2), Public University of Navarre (UPNA), Campus Arrosadía, 31006 Pamplona, Spain
| | - Guillermo Cruz-Quesada
- Department of Science, Institute for Advanced Materials and Mathematics (INAMAT2), Public University of Navarre (UPNA), Campus Arrosadía, 31006 Pamplona, Spain
| | | | | | | | - María Victoria López-Ramón
- Department of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, University of Jaen, 23071 Jaen, Spain
| | - Maialen Espinal-Viguri
- Department of Science, Institute for Advanced Materials and Mathematics (INAMAT2), Public University of Navarre (UPNA), Campus Arrosadía, 31006 Pamplona, Spain
| | - Julián J Garrido
- Department of Science, Institute for Advanced Materials and Mathematics (INAMAT2), Public University of Navarre (UPNA), Campus Arrosadía, 31006 Pamplona, Spain
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Novel Silica Hybrid Xerogels Prepared by Co-Condensation of TEOS and ClPhTEOS: A Chemical and Morphological Study. Gels 2022; 8:gels8100677. [PMID: 36286178 PMCID: PMC9601464 DOI: 10.3390/gels8100677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/15/2022] [Accepted: 10/17/2022] [Indexed: 11/29/2022] Open
Abstract
The search for new materials with improved properties for advanced applications is, nowadays, one of the most relevant and booming fields for scientists due to the environmental and technological needs of our society. Within this demand, hybrid siliceous materials, made out of organic and inorganic species (ORMOSILs), have emerged as an alternative with endless chemical and textural possibilities by incorporating in their structure the properties of inorganic compounds (i.e., mechanical, thermal, and structural stability) in synergy with those of organic compounds (functionality and flexibility), and thus, bestowing the material with unique properties, which allow access to multiple applications. In this work, synthesis using the sol-gel method of a series of new hybrid materials prepared by the co-condensation of tetraethoxysilane (TEOS) and 4-chlorophenyltriethoxysilane (ClPhTEOS) in different molar ratios is described. The aim of the study is not only the preparation of new materials but also their characterization by means of different techniques (FT-IR, 29Si NMR, X-ray Diffraction, and N2/CO2 adsorption, among others) to obtain information on their chemical behavior and porous structure. Understanding how the chemical and textural properties of these materials are modulated with respect to the molar percentage of organic precursor will help to envisage their possible applications: From the most conventional such as catalysis, adsorption, or separation, to the most advanced in nanotechnology such as microelectronics, photoluminescence, non-linear optics, or sensorics.
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Cruz-Quesada G, Espinal-Viguri M, López-Ramón MV, Garrido JJ. Hybrid Xerogels: Study of the Sol-Gel Process and Local Structure by Vibrational Spectroscopy. Polymers (Basel) 2021; 13:polym13132082. [PMID: 34202735 PMCID: PMC8271438 DOI: 10.3390/polym13132082] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 12/19/2022] Open
Abstract
The properties of hybrid silica xerogels obtained by the sol-gel method are highly dependent on the precursor and the synthesis conditions. This study examines the influence of organic substituents of the precursor on the sol-gel process and determines the structure of the final materials in xerogels containing tetraethyl orthosilicate (TEOS) and alkyltriethoxysilane or chloroalkyltriethoxysilane at different molar percentages (RTEOS and ClRTEOS, R = methyl [M], ethyl [E], or propyl [P]). The intermolecular forces exerted by the organic moiety and the chlorine atom of the precursors were elucidated by comparing the sol-gel process between alkyl and chloroalkyl series. The microstructure of the resulting xerogels was explored in a structural theoretical study using Fourier transformed infrared spectroscopy and deconvolution methods, revealing the distribution of (SiO)4 and (SiO)6 rings in the silicon matrix of the hybrid xerogels. The results demonstrate that the alkyl chain and the chlorine atom of the precursor in these materials determines their inductive and steric effects on the sol-gel process and, therefore, their gelation times. Furthermore, the distribution of (SiO)4 and (SiO)6 rings was found to be consistent with the data from the X-ray diffraction spectra, which confirm that the local periodicity associated with four-fold rings increases with higher percentage of precursor. Both the sol-gel process and the ordered domains formed determine the final structure of these hybrid materials and, therefore, their properties and potential applications.
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Affiliation(s)
- Guillermo Cruz-Quesada
- Departamento de Ciencias, Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics (INAMAT), Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain
| | - Maialen Espinal-Viguri
- Departamento de Ciencias, Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics (INAMAT), Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain
- Correspondence: (M.E.-V.); (J.J.G.); Tel.: +34-948-169604 (M.E.-V.); +34-948-169601 (J.J.G.)
| | - María Victoria López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, University of Jaén, 23071 Jaén, Spain;
| | - Julián J. Garrido
- Departamento de Ciencias, Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics (INAMAT), Campus Arrosadía, Public University of Navarre (UPNA), 31006 Pamplona, Spain
- Correspondence: (M.E.-V.); (J.J.G.); Tel.: +34-948-169604 (M.E.-V.); +34-948-169601 (J.J.G.)
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