Abstract
Structural, chemical, morphological, and hydrophilic surface characteristics of SBA-15 silica synthesized by hydrothermal method in an autoclave and in a microwave-heated reactor were analyzed in this work. The influence of time and temperature on these characteristics was investigated. Materials were characterized by textural analysis (BET), FTIR, TGA, XRD, goniometer contact angle, SEM, and TEM. It was possible to obtain SBA-15 silicas assisted by microwave heating irradiation with short-time synthesis (0.5–8 h) compared with the hydrothermal classic method (24 h). Materials presented surface area between 650 and 850 m2 g−1. Through the XRD and TEM results, it was observed that mesostructured materials with two-dimensional, long-range, and hexagonal ordered channels are characteristic of SBA-15. This study showed that heating by microwave irradiation during silica synthesis generates materials with a greater amount of silanol groups. It is possible to control the surface properties of SBA-15 during the microwave-assisted synthesis through temperature tuning. Higher temperature provided SBA-15 with higher hydrophilicity.
Highlights
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SBA-15 synthesis by MW reduces significant reaction time.
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SBA-15 synthesized in MW at 80 °C showed 805 m2 g−1 of specific surface area.
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Heating by MW in the silica synthesis generates materials with higher hydrophilicity.
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Acknowledgements
The authors would like to thank the LPA laboratories that are part of the Institute of Technology and Research (ITP/UNIT) and COMCAP-UEM for the availability of equipment for characterization of materials. We also thank Iago Filipe Silva de Oliveira by graphical abstract edition.
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The authors thank CAPES (Coordination for the Improvement of Higher Education Personnel)—Finance Code 001, CNPq (National Council for Scientific and Technological Development), FAPITEC/SE (Foundation for Research and Technological Innovation Support of the State of Sergipe), ANP (National Agency of Petroleum, Natural Gas, and Biofuels), and PETROBRAS S.A.
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Oliveira, M.R., Deon, M., Benvenutti, E.V. et al. Effect of microwave irradiation on the structural, chemical, and hydrophilicity characteristics of ordered mesoporous silica SBA-15. J Sol-Gel Sci Technol 94, 708–718 (2020). https://doi.org/10.1007/s10971-020-05219-w
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DOI: https://doi.org/10.1007/s10971-020-05219-w