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Effect of Activating Solution Modulus on the Synthesis of Sustainable Geopolymer Binders Using Spent Oil Bleaching Earths as Precursor

Author

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  • P. Delgado-Plana

    (Department of Chemical, Environmental, and Materials Engineering, Campus Las Lagunillas, Higher Polytechnic School of Jaén, University of Jaén, s/n, 23071 Jaén, Spain)

  • A. Rodríguez-Expósito

    (Department of Chemical, Environmental, and Materials Engineering, Campus Las Lagunillas, Higher Polytechnic School of Jaén, University of Jaén, s/n, 23071 Jaén, Spain)

  • S. Bueno-Rodríguez

    (Department of Chemical, Environmental, and Materials Engineering, Campus Las Lagunillas, Higher Polytechnic School of Jaén, University of Jaén, s/n, 23071 Jaén, Spain
    Center for Advanced Studies in Earth Sciences, Energy and Environment (CEACTEMA), Campus Las Lagunillas, University of Jaén, s/n, 23071 Jaén, Spain)

  • L. Pérez-Villarejo

    (Center for Advanced Studies in Earth Sciences, Energy and Environment (CEACTEMA), Campus Las Lagunillas, University of Jaén, s/n, 23071 Jaén, Spain
    Department of Chemical, Environmental, and Materials Engineering, Campus Científico-Tecnológico, Higher Polytechnic School of Linares, University of Jaén, Cinturón Sur s/n, 23700 Linares, Spain)

  • D. M. Tobaldi

    (Department of Materials and Ceramic Engineering & CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
    CNR Nanotec, Campus Ecoteckne, Institute of Nanotechnology, 73100 Lecce, Italy)

  • J. A. Labrincha

    (Department of Materials and Ceramic Engineering & CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal)

  • D. Eliche-Quesada

    (Department of Chemical, Environmental, and Materials Engineering, Campus Las Lagunillas, Higher Polytechnic School of Jaén, University of Jaén, s/n, 23071 Jaén, Spain
    Center for Advanced Studies in Earth Sciences, Energy and Environment (CEACTEMA), Campus Las Lagunillas, University of Jaén, s/n, 23071 Jaén, Spain)

Abstract

The valorization of spent oil bleaching earths (SOBE) is crucial for the protection of the environment and the reuse of resources. In this research, alkali-activated binders were manufactured at room temperature using SOBE as a precursor by varying the mass ratio between the activating solutions of sodium silicate (Na 2 SiO 3 ) and 6 M sodium hydroxide (NaOH) (activating solution modulus) (Na 2 SiO 3 /NaOH ratio = 1/1; 1/2; 1/3; 1/4) to investigate the influence on the technological properties of the materials. This process intends to evaluate the potential of SOBE, heat-treated at 550 °C (1 h), as a precursor of the reaction (source of aluminosilicates). Samples produced with higher amounts of sodium silicate developed a denser structure, with lower porosity and a higher amount of geopolymer gel. Maximum flexural (8.35 MPa) and compressive (28.4 MPa) strengths of samples cured at room temperature for 28 days were obtained with a Na 2 SiO 3 /NaOH mass ratio of 1/1. The study demonstrates that SOBE waste can be used as a precursor in the manufacture of geopolymer binders that show a good compromise between physical, mechanical and thermally insulating characteristics.

Suggested Citation

  • P. Delgado-Plana & A. Rodríguez-Expósito & S. Bueno-Rodríguez & L. Pérez-Villarejo & D. M. Tobaldi & J. A. Labrincha & D. Eliche-Quesada, 2021. "Effect of Activating Solution Modulus on the Synthesis of Sustainable Geopolymer Binders Using Spent Oil Bleaching Earths as Precursor," Sustainability, MDPI, vol. 13(13), pages 1-18, July.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:13:p:7501-:d:588920
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    References listed on IDEAS

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    1. Rinu Samuel & Anand J. Puppala & Miladin Radovic, 2020. "Sustainability Benefits Assessment of Metakaolin-Based Geopolymer Treatment of High Plasticity Clay," Sustainability, MDPI, vol. 12(24), pages 1-14, December.
    2. Numanuddin M. Azad & S.M. Samindi M.K. Samarakoon, 2021. "Utilization of Industrial By-Products/Waste to Manufacture Geopolymer Cement/Concrete," Sustainability, MDPI, vol. 13(2), pages 1-22, January.
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