Photoactivity under visible light of metal loaded TiO 2 catalysts prepared by low frequency ultrasound treatment

Bellardita, Marianna; Nazer, Hossam A. El; Loddo, Vittorio; Parrino, Francesco; Venezia, Anna Maria

doi:10.1016/j.cattod.2016.11.026

Cited by 38 publications

(20 citation statements)

References 37 publications

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“…In many cases sensitization of TiO 2 under visible light is achieved by modifying its surface with dyes [3], chromogenic species [4], or metal nanoparticles [5]. However, the resulting materials are often poorly stable, with few exceptions [6], and mainly useful for niche applications rather than for environmental remediation, where large effluent volumes need to be treated.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Solar Light Photocatalytic Activity of Ag Doped TiO2–Ag3PO4 Composites

et al. 2020

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Composites comprised of Ag3PO4 and bare TiO2 (TiO2@Ag3PO4) or silver doped TiO2 (Ag@TiO2–Ag3PO4) have been synthesized by coupling sol–gel and precipitation methods. For the sake of comparison, also the bare components have been similarly prepared. All the samples have been characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR), photoelectrochemical measurements, and specific surface area (SSA) analysis. The optoelectronic and structural features of the samples have been related to their photocatalytic activity for the degradation of 4–nitrophenol under solar and UV light irradiation. Coupling Ag3PO4 with silver doped TiO2 mitigates photocorrosion of the Ag3PO4 counterpart, and remarkably improves the photocatalytic activity under solar light irradiation with respect to the components, to the TiO2–Ag3PO4 sample, and to the benchmark TiO2 Evonik P25. These features open the route to future applications of this material in the field of environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Enhanced Solar Light Photocatalytic Activity of Ag Doped TiO2–Ag3PO4 Composites

et al. 2020

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“…The optimization of the degradation of organic pollutants in an actual confectionery wastewater was performed using single-variable studies [4,[27][28][29][30][31]. However, it is difficult to predict the optimum reaction conditions from previous results owing to the possible interactions between different independent variables involved in the photocatalytic reactions [10,17,22,30].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Treatment of An Actual Confectionery Wastewater Using Ag/TiO2/Fe2O3: Optimization of Photocatalytic Reactions Using Surface Response Methodology

Lin

Mehrvar

2018

Catalysts

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Titanium dioxide (TiO 2 ) photocatalysis is one of the most commonly studied advanced oxidation processes (AOPs) for the mineralization of deleterious and recalcitrant compounds present in wastewater as it is stable, inexpensive, and effective. Out of all, doping with metal and non-metals, and the heterojunction with another semiconductor were proven to be efficient methods in enhancing the degradation of organic pollutants under ultraviolet (UV) and visible light. However, complex degradation processes in the treatment of an actual wastewater are difficult to model and optimize. In the present study, the application of a modified photocatalyst, Ag/TiO 2 /Fe 2 O 3 , for the degradation of an actual confectionery wastewater was investigated. Factorial studies and statistical design of experiments using the Box-Behnken method along with response surface methodology (RSM) were employed to identify the individual and cross-factor effects of independent parameters, including light wavelength (nm), photocatalyst concentration (g/L), initial pH, and initial total organic carbon (TOC) concentration (g/L). The maximum TOC removal at optimum conditions of light wavelength (254 nm), pH (4.68), photocatalyst dosage (480 mg/L), and initial TOC concentration (11,126.5 mg/L) was determined through the numerical optimization method (9.78%) and validated with experimental data (9.42%). Finally, the first-order rate constant with respect to TOC was found to be 0.0005 min −1 with a residual value of 0.998.

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“…Metal doping is one of the most used techniques to these aims. Noble metals such as silver, gold, rhodium or platinum have been deposited on the surface of TiO 2 or ZnO in the form of metal nanoparticles [12], or chemically bonded in other oxidation states [13], giving rise to visible light activity of the powders or selectively addressing target chemical reactions such as hydrogen generation or organic synthesis.…”

Section: Introductionmentioning

confidence: 99%