Abstract
The design of photocatalytic building materials based on geopolymers (GPs) through recycling industrial by-products is an up-and-coming technology that provide durability during environmental exposure. Thus, this work aimed to design, fabricate, and characterized photocatalytic geopolymers based on recycling industrial wastes (slags and fly ash) and TiO2 nanoparticles to propose a strategy to contribute to a circular economy. Taguchi L9 orthogonal design was used to optimize the formulation of GPs to obtain higher self-cleaning efficiency under solar light irradiation. The factors modified during the GPs fabrication were %TiO2, %fly ash, and temperature. The main products of the slag activation were calcium aluminosilicate hydrate and Zeolite X. The self-cleaning efficiency of the GPs was optimized through the signal-to-noise ratio (S/N): Larger is better, which conditions were 3 wt% of TiO2, 300 °C, and no-fly ash. After 3 days of solar light exposure, the optimal GP removes up to 88.4% of the pollutant from its surface, which evidences its self-cleaning activity under real outdoor conditions. Also, the GP fabricated under the optimal conditions generated hydroxyl radicals under solar light, which can open a window of possibilities to remove a wide range of atmospheric pollutants by recycling industrial by-products.
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Acknowledgements
The authors thank CONACYT for financial support of this research through the projects: Cátedras CONACYT 1060 and Paradigmas y Fronteras de la Ciencia 320379. Also, the authors want to thank Carolina Itzel Cardona Martinez for participate in the early stage of this project in the Scientific Summer Student Program UANL PROVERICYT 2021. The slags used for this project were kindly provided by Dr. Juan Antonio López Corpus and Ing. Miguel Angel Gomez Lopez of AHMSA®.
Funding
Funding was supported by Consejo Nacional de Ciencia y Tecnología (Grant No. Paradigmas y Fronteras de la Ciencia 320379).
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Luévano-Hipólito, E., Torres-Martínez, L.M. & Rodríguez-González, E. Recycling Waste Materials to Fabricate Solar-Driven Self-Cleaning Geopolymers. Waste Biomass Valor 15, 2833–2843 (2024). https://doi.org/10.1007/s12649-023-02309-y
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DOI: https://doi.org/10.1007/s12649-023-02309-y