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Impact of the PtO loading on mesoporous TiO2 nanoparticles for enhanced photodegradation of Imazapyr herbicide under simulated solar light

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Abstract

The removal of the commonly used herbicides is essential for environmental remediation. In this study, mesoporous TiO2 photocatalysts modified with PtO were synthetized by the template-assisted scheme to develop highly effective materials for the elimination of Imazapyr herbicide under visible-light preservation. The effect of the PtO loading was investigated, and the xPtO-TiO2 materials were deeply considered by N2 physisorption, XRD, HRTEM, FTIR, DRS UV-Vis, Raman, XPS, PL and photocurrent measurements. Total Imazapyr photodegradation was archived on mesoporous TiO2 photocatalysts loaded with 0.6 and 0.8 wt% of PtO. The optimized xPtO-TiO2 photocatalyst degrades the Imazapyr under solar light more efficiently than the pure TiO2 and the commercial Degussa P25 (photoefficiency of 35%, 1%, and 0.5%, respectively). The improvement in the photoefficiency of the xPtO-TiO2 photocatalysts respect to the pure TiO2 was associated to the cooperative effect between PtO and TiO2 nanoparticles leading to a lessening in the energy gap and lower recombination of excited electron-hole pairs. The optimized 0.6PtO-TiO2 photocatalyst demonstrated to be stable and recyclable after up to five consecutive photocatalytic runs. Therefore, it can be a potential candidate for the significant mineralization of Imazapyr herbicide under solar light irradiation.

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Acknowledgments

This project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, Saudi Arabia under grant no. KEP-PhD-37-130-38. The authors, therefore, acknowledge with thanks DSR for technical and financial support.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Kingdom of Saudi Arabia

    I. A. Mkhalid, R. M. Mohamed & A. A. Alshahri

  2. Sustainable Energy and Chemistry Group, Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie, 2 Cantoblanco, 28049, Madrid, Spain

    J. L. G. Fierro

  3. Advanced Materials Department, Central Metallurgical R&D Institute, CMRDI, P.O. Box 87, Helwan, Cairo, 11421, Egypt

    R. M. Mohamed

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  1. I. A. Mkhalid
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  4. A. A. Alshahri
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Correspondence to I. A. Mkhalid.

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This article is part of the topical collection: Nanotechnology in Arab Countries

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Mkhalid, I.A., Fierro, J.L.G., Mohamed, R.M. et al. Impact of the PtO loading on mesoporous TiO2 nanoparticles for enhanced photodegradation of Imazapyr herbicide under simulated solar light. J Nanopart Res 22, 347 (2020). https://doi.org/10.1007/s11051-020-05072-6

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