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Efficient photocatalytic degradation of phenol by Ag-doped TiO2 nanocomposite photocatalysts under visible light irradiation in a three-phase fluidized bed reactor

Nasim Yavari, Omid Tavakoli, and Mohammad Javad Parnian

School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran

 

E-mail: otavakoli@ut.ac.ir

Received: 12 August 2020  Accepted: 21 January 2021

Abstract:

In this study, phenol degradation was investigated in a three-phase fluidized bed photocatalytic reactor under visible irradiations by Ag–TiO2 photocatalyst. The modified photocatalyst (1%Ag/TiO2) was synthesized by the photodeposition method and then characterized by DRS, XRD, and SEM. The characterization results showed the Ag deposition on the surface of TiO2 nanoparticles. The operating parameters effects including catalyst loading (0.9, 1.5, and 3 g/L), initial contaminant concentration (5, 10, 15, 20, and 50 mg/L) with/without H2O2 on the photocatalytic degradation of phenol were studied, and the optimum operational condition was determined. The results showed enhanced degradation using Ag-doped catalyst under visible irradiation, while 5 mg/L phenol concentration at the initial point, 1.5 g/L catalyst loading with the presence of 10 mg/L of H2O2, was the most suitable condition to reach a remarkable degradation efficiency. Besides, the phenol photocatalytic degradation for modified Ag/TiO2 catalyst under visible light was compared to commercial TiO2 catalyst under UV irradiation at the optimum operating conditions showing a higher photocatalytic activity for Ag/TiO2 catalyst.

Keywords: Photocatalytic degradation; Phenol degradation; Fluidized bed reactor; Visible light; Ag/TiO2 photocatalyst

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01531-z

 

Chemical Papers 75 (7) 3181–3196 (2021)

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