Reactive Radical Species in Photocatalytic Activities of PET-Ag-TiO2 Nanoparticles Composites Under Visible Light Irradiation 


Vol. 22,  No. 3, pp. 597-611, Mar.  2021
10.1007/s12221-021-0206-8


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  Abstract

In this research, the reactive radical species in photocatalytic activities of a composite photocatalyst made from PET filaments loaded with Ag-TiO2 nanoparticles under visible light irradiation, in comparison with those of as-modified Ag-TiO2 nanoparticles, were reported and its photocatalytic mechanism was investigated. The PET filaments were modified by using tetrabutyl titanate as the TiO2 precursor and silver nitrate as the dopant in a hydrothermal process. The Ag decorated TiO2 nanoparticles were synthesized and deposited on the surfaces of PET filaments in the hydrothermal process at 120 oC for 180 min. The morphology, phase structure, chemical binding state, and optical properties of the PET-Ag-TiO2 nanoparticles composites were systemically studied by means of field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, diffuse reflectance spectroscopy (DRS), and ultraviolet photoelectron spectroscopy (UPS) techniques. The photocatalytic activities of the PET-Ag-TiO2 nanoparticles composites were evaluated in the photodegradation of both methylene blue (MB) and methyl orange (MO) dyes under visible light irradiation. It was found that, unlike in the asobtained TiO2 nanoparticles and Ag decorated TiO2 nanoparticles, the photoinduced holes (h+) were the major reactive radical species in both PET-Ag-TiO2 composite photocatalyst and the PET filaments loaded with TiO2 nanoparticles in the MB photodegradation process. The experimental results also indicated that the PET-Ag-TiO2 nanoparticles composites led to the improvement of the separation efficiency of photogenerated electron-hole pairs. The enhanced photocatalytic activity of the PET filaments coated with Ag decorated TiO2 nanoparticles was ascribed to both the incorporation of Ag nanoparticles into TiO2 nanoparticles and the possible infiltration of Ag/Ti nanoparticles into PET polymers. In addition, the wavelength and intensity of monochromatic light had great influences on the photodegradation rate of dye used, which was closely correlated with the maximum absorption wavelength of the dye to be degraded.

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  Cite this article

[IEEE Style]

H. Zhang, D. Wang, C. Sheng, D. Ben, H. Wu, N. Mao, "Reactive Radical Species in Photocatalytic Activities of PET-Ag-TiO2 Nanoparticles Composites Under Visible Light Irradiation," Fibers and Polymers, vol. 22, no. 3, pp. 597-611, 2021. DOI: 10.1007/s12221-021-0206-8.

[ACM Style]

Hui Zhang, Dou Wang, Cuihong Sheng, Deping Ben, Hailiang Wu, and Ningtao Mao. 2021. Reactive Radical Species in Photocatalytic Activities of PET-Ag-TiO2 Nanoparticles Composites Under Visible Light Irradiation. Fibers and Polymers, 22, 3, (2021), 597-611. DOI: 10.1007/s12221-021-0206-8.

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