Synthesis of Octahedral Bipyramid TiO₂ Nanoparticles Free of Growth Agent as Congo Red Photocatalyst
DOI:
https://doi.org/10.29356/jmcs.v70i1.2436Keywords:
TiO₂, nanoparticles, photocatalyst, bipyramidal, Congo red dyeAbstract
In this work, we prepared anatase TiO2 nanoparticles with octahedral bipyramidal shapes with different (001)/(101) ratio facets as photocatalysts for Congo red (CR) dye. The general method to prepare such nano-TiO2 photocatalysts involves a peptization step with HNO3 and hydrothermal treatment at different temperatures, making this a facile and friendly method to controllably synthesize TiO2 with octahedral bipyramidal shape and tuned (001)/(101) ratio free of capping surfactants or direction agent like HF. The photocatalytic activity of these anatase TiO2 nanoparticles was evaluated through CR dye photodegradation under UV light illumination. It was shown that all samples can present a photocatalytic activity, and the degradation efficiency and kinetics depend on nanoparticle size and (001)/(101) ratio facets.
Resumen. En este trabajo preparamos nanopartículas de TiO2 anatasa con forma bipiramidal octaédrica con diferentes facetas de proporción (001)/(101) como fotocatalizadores para el colorante Congo rojo (CR). El método general parapreparar dichos nano-fotocatalizadores de TiO2 implica un paso de peptización con HNO3 y un tratamiento hidrotermal a diferentes temperaturas, lo que hace de este un método fácil y amigable para sintetizar de manera controlada TiO2 con forma bipiramidal octaédrica y proporción ajustada (001)/(101) libre de surfactantes de recubrimiento o agentes de dirección como HF. La actividad fotocatalítica de estas nanopartículas de TiO2 anatasa se evaluó a través de la fotodegradación del colorante RC bajo iluminación de luz UV. Se demostró que todas las muestras pueden presentar una actividad fotocatalítica y la eficiencia de degradación y la cinética dependen del tamaño de las nanopartículas y de la proporción de facetas (001)/(101).
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Copyright (c) 2026 Paulina Vargas-Rodriguez, Carla Marlene Toledo Bonola, Carolina Silva-Carrillo, Brenda Cecilia Alcantar-Velazquez, Rosa-María Félix-Navarro, Rosalio Velarde-Barraza, Edgar-Alonso Reynoso-Soto
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