| Title: |
Photocatalytic evaluation of tetragonal and orthorhombic lead oxide nanoparticles in dye degradation treatment. |
| Authors: |
Netzahual-Lopantzi, Angel, García-Nieto, Edelmira, Juárez-Santacruz, Libertad, Romero-Ibarra, Issis Claudette |
| Source: |
Applied Physics A: Materials Science & Processing; Aug2023, Vol. 129 Issue 8, p1-12, 12p |
| Subject Terms: |
LEAD oxides, ANTHRAQUINONE dyes, NANOPARTICLES, EYE color, INFRARED spectroscopy, DYES & dyeing |
| Abstract: |
The discharge of wastewater contaminated with dyes is the main cause of contamination of aquatic systems. The photocatalytic process is a green remediation technology, and it has received a lot of attention in recent years due to its ability to remediate hazardous dyes in aqueous environments and convert them into less aggressive compounds. In this work, the photocatalytic potential of tetragonal and orthorhombic lead oxide nanoparticles was investigated. Nuclear Fast Red, a dye derived from anthraquinone, was used as a model contaminant in aqueous solution. Under light irradiation at 254 nm and in the presence of lead oxide nanoparticles, it was possible to observe with the naked eye a color change from deep red to less color, while the absorbance of the solution at 518 nm decreased with the reaction time. Nuclear Fast Red degradation was evidenced by spectral shift using infrared spectroscopy. The anthraquinone-derived dye degradation reaction follows pseudo-first-order kinetics, in line with the Langmuir–Hinshelwood model. The model used allowed calculating a half-life of the anthraquinone dye of 6.6 min in the presence of tetragonal lead oxide. The experimental conditions allowed the degradation of the dye in a percentage close to 95%. Finally, the toxicity of the lead oxide nanoparticles was also evaluated and a possible degradation mechanism in aqueous medium was proposed. [ABSTRACT FROM AUTHOR] |
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