4.7 Article

Photoremoval of Bisphenol A Using Hierarchical Zeolites and Diatom Biosilica

Journal

Publisher

MDPI
DOI: 10.3390/ijms24032878

Keywords

photocatalytic removal; photocatalysts; bisphenol A; hierarchical zeolites; diatom biosilica

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This study aimed to design an effective method for the photocatalytic removal of bisphenol A using hierarchical zeolites and ruthenium ion-modified diatom biosilica loaded with silver as photocatalysts. The reaction conditions including temperature, pH, composition of the reaction mixture, and electromagnetic wavelength were optimized. The ruthenium ion-modified biosilica showed the highest efficiency for bisphenol A removal at a rate higher than 99%.
Bisphenol A (4,4-isopropylidenediphenol, BPA) is an organic compound widely used, e.g., in the production of epoxy resins, plastics, and thermal receipt papers. Unfortunately, bisphenol A has negative effects on human health, which has prompted the search for an effective method of its removal. One of the most promising methods of its elimination is photocatalytic removal. The aim of this study was to design an effective method for the photocatalytic removal of bisphenol A using, for the first time, hierarchical zeolites and ruthenium ion-modified diatom biosilica, and silver as photocatalysts and optimization of the reaction conditions: temperature, pH, and composition of the reaction mixture as well as the electromagnetic wavelength. Additionally, for the first time, the electromagnetic wavelength that would be most suitable for the study was selected. All materials used were initially characterized by XRD and low-temperature nitrogen adsorption/desorption isotherms. Ruthenium ion-modified biosilica proved to be the most effective catalyst for bisphenol A removal, which occurred at a rate higher than 99%.

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