Selective photodegradation of phenol in the presence of a commercial humic acid

Palacio, Magdalena; Rossi, Lucía; Hermosilla, María Estefanía Farías; Rosso, Janina A.; Villabrille, Paula Isabel; Martin, Marcela V.

doi:10.1016/j.jece.2017.10.021

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…The selectivity of 0.01VTi-400 for phenol degradation ([phenol] 0 = 50 μM) in the presence of AHA was tested using UV lamps (for 3 h). Phenol degradation was lower than in the corresponding experiment without AHA, showing the inhibition effect of AHA (Palacio et al 2017). It could be assumed that AHA acts as radical scavenger because some electron-rich moieties (e.g., phenolic groups) in its molecular structure are readily attacked by HO .…”

Section: Study Of the Operating Conditions For The Degradation Of Phe...mentioning

confidence: 69%

“…Reactions photocatalyzed by TiO 2 are nonselective oxidations because they are governed by free-radical reaction mechanisms. Low selectivity means that the efficacy of the treatment could be strongly inhibited in effluents containing low concentrations of pollutants (highly toxic substances) together with high concentrations of natural organic matter (NOM) (Palacio et al 2017). NOM usually leads to the loss of oxidizing capacity in a radical-based advanced oxidation process (Deng et al 2017;Song et al 2017;Cai et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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V-doped TiO2 photocatalysts and their application to pollutant degradation

Rossi

Palacio

Villabrille

et al. 2021

Environ Sci Pollut Res

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V-doped TiO 2 materials (0.01, 0.05, 0.10, and 1.00 nominal atomic %) were synthesized by the sol-gel method and characterized by X-ray diffraction, Raman spectroscopy, UV-visible diffuse reflectance spectroscopy, N 2 adsorption-desorption isotherms, Xray photoelectron spectroscopy, and H 2 -temperature programmed reduction. Two vanadium precursors (vanadyl acetylacetonate and ammonium metavanadate) and three calcination temperatures (400, 500, and 600 °C, with and without air circulation) were assayed. The efficiency of the materials as photocatalysts was studied by the degradation of phenol with UV and visible lamps. The photocatalyst prepared from vanadium acetylacetonate, with a vanadium content of 0.01 nominal atomic %, calcination at 400 °C without air circulation (0.01VTi-400), showed the best performance, reaching 100% and 30% degradation of phenol (50 μM) by irradiation with UV lamps (3 h) and visible lamps (5 h), respectively. To evaluate the efficiency of this catalyst in the degradation of other structurally related compounds, two substituted phenols were selected: 4-chlorophenol and 4-nitrophenol. The 0.01VTi-400 photocatalyst showed to be applicable to the degradation of phenolic compounds when the substituent was an activating group or a weakly deactivating group (for electrophilic reactions). Additionally, the selectivity of 0.01VTi-400 for phenol degradation in the presence of Aldrich humic acid was tested: phenol degradation reached 68% (3 h, UV lamps). The performance of 0.01VTi-400 indicated that it is a promising material for further applications.

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Section: Study Of the Operating Conditions For The Degradation Of Phe...mentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

V-doped TiO2 photocatalysts and their application to pollutant degradation

Rossi

Palacio

Villabrille

et al. 2021

Environ Sci Pollut Res

Self Cite

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“…The objective of this research is to (1) present the design of a photoreactor, (2) evaluate the effect of different reaction parameters over the photodegradation process, , and (3) verify the effect of stirring inside the reactor using simulation environments. For the reactor’s construction, economic and easy-to-access materials were used seeking to take advantage of the greatest amount of UV radiation possible.…”

Section: Introductionmentioning

confidence: 99%

Initial Approximation to the Design and Construction of a Photocatalysis Reactor for Phenol Degradation with TiO₂ Nanoparticles

et al. 2019

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A photoreactor was designed, built, and optimized to carry out the degradation of phenol. To achieve this, phenol concentration was used as the reference to compare the photocatalysis reaction efficiency obtained through this research with results from other studies. Additionally, during the building process, different types of glass were evaluated with the objective of finding a functional and economic material to build the photoreactor. It was found that Pyrex glass was the most suitable material to work with. As a UV light source to build the photoreactor, a dry gel nail lamp was used with 9 W, λ = 365 nm bulbs. On the other hand, the effects of different parameters (such as the catalyst mass (TiO2 Degussa P-25), stirring speed (RPM), UV lamps, and temperature) over the photocatalysis reaction rate were analyzed. Also, the reaction’s thermodynamic parameters were determined and found to be similar to those found in other investigations. Finally, the homogeneity in the distribution of TiO2 particles inside the reactor when stirred at 475 rpm was verified using a COMSOL Multiphysics computer fluid dynamics simulation, which showed the theoretical trajectory of particles inside the reactor depending on the stirring rate of the reactor.

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