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Ag₃PO₄-Deposited TiO₂@Ti₃C₂ Petals for Highly Efficient Photodecomposition of Various Organic Dyes under Solar Light.

ABSTRACT: Two-dimensional Ti₃C₂ MXenes can be used to fabricate hierarchical TiO₂ nanostructures that are potential photocatalysts. In this study, the photodecomposition of organic dyes under solar light was investigated using flower-like TiO₂@Ti₃C₂, deposited using narrow bandgap Ag₃PO₄. The surface morphology, crystalline structure, surface states, and optical bandgap properties were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption analysis, and UV-Vis diffuse reflectance spectroscopy (UV-DRS). Overall, Ag₃PO₄-deposited TiO₂@Ti₃C₂, referred to as Ag₃PO₄/TiO₂@Ti₃C₂, demonstrated the best photocatalytic performance among the as-prepared samples, including TiO₂@Ti₃C₂, pristine Ag₃PO₄, and Ag₃PO₄/TiO₂ P25. Organic dyes, such as rhodamine B (RhB), methylene blue (MB), crystal violet (CV), and methylene orange (MO), were efficiently degraded by Ag₃PO₄/TiO₂@Ti₃C₂. The significant enhancement of photocatalysis by solar light irradiation was attributed to the efficient deposition of Ag₃PO₄ nanoparticles on flower-like TiO₂@Ti₃C₂ with the efficient separation of photogenerated e-/h+ pairs, high surface area, and extended visible-light absorption. Additionally, the small size of Ag₃PO₄ deposition (ca. 4-10 nm diameter) reduces the distance between the core and the surface of the composite, which inhibits the recombination of photogenerated charge carriers. Free radical trapping tests were performed, and a photocatalytic mechanism was proposed to explain the synergistic photocatalysis of Ag₃PO₄/TiO₂@Ti₃C₂ under solar light.

SUBMITTER: Nguyen NTA

PROVIDER: S-EPMC9322657 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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Ag3PO4-Deposited TiO2@Ti3C2 Petals for Highly Efficient Photodecomposition of Various Organic Dyes under Solar Light.

Nguyen Ngoc Tuyet Anh NTA Kim Hansang H

Nanomaterials (Basel, Switzerland) 20220718 14

Two-dimensional Ti3C2 MXenes can be used to fabricate hierarchical TiO2 nanostructures that are potential photocatalysts. In this study, the photodecomposition of organic dyes under solar light was investigated using flower-like TiO2@Ti3C2, deposited using narrow bandgap Ag3PO4. The surface morphology, crystalline structure, surface states, and optical bandgap properties were determined using scanning electro ...[more]

PMID: 35889687

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Project description:Organic pollutants such as dyes and pharmaceutical drugs have become an environmental menace, particularly in water bodies owing to their unregulated discharge. It is thus required to develop an economically viable and environment-friendly approach for their degradation in water bodies. In this study, for the first time, we report green route-synthesized plasmonic nanostructures (PM-CQDs (where M: Au and Ag)) decorated onto TiO2 nanofibers for the treatment of toxic dye- and pharmaceutical drug-based wastewater. PM-CQDs are efficaciously synthesized using carbon quantum dots (CQDs) as the sole reducing and capping agent, wherein CQDs are derived via a green synthesis approach from Citrus limetta waste. The characteristic electron-donating property of CQDs played a key role in the reduction of Au3+ to Au0 and Ag+ to Ag0 under visible light irradiation to obtain PAu-CQDs and PAg-CQDs, respectively. Thus, the obtained CQDs, PAu-CQDs, and PAg-CQDs are loaded onto TiO2 nanofibers to obtain a PM-CQD/TiO2 nanocomposite (NC), and are further probed via transmission electron microscopy, scanning electron microscopy and UV-visible spectrophotometry. The degradation of organic pollutants and pharmaceutical drugs using methylene blue and erythromycin as model pollutants is mapped with UV-vis and NMR spectroscopy. The results demonstrate the complete MB dye degradation in 20 minutes with 1 mg mL-1 of PAu-CQD/TiO2 NC, which otherwise is 30 minutes for PAg@CQD/TiO2 dose under visible light irradiation. Similarly, the pharmaceutical drug was found to degrade in 150 minutes with PAu-CQD/TiO2 photocatalysts. These findings reveal the enhanced photocatalytic performance of the green-synthesized Au decorated with TiO2 nanofibers and are attributed to the boosted SPR effect and aqueous-phase stability of Au nanostructures. This study opens a new domain of utilizing waste-derived and green-synthesized plasmonic nanostructures for the degradation of toxic/hazardous dyes and pharmaceutical pollutants in water.

Dataset Information

Ag₃PO₄-Deposited TiO₂@Ti₃C₂ Petals for Highly Efficient Photodecomposition of Various Organic Dyes under Solar Light.

Publications

Ag<sub>3</sub>PO<sub>4</sub>-Deposited TiO<sub>2</sub>@Ti<sub>3</sub>C<sub>2</sub> Petals for Highly Efficient Photodecomposition of Various Organic Dyes under Solar Light.

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