Photo-Oxidation of Ammonia to Molecular Nitrogen in Water under UV, Vis and Sunlight Irradiation

Conte, Francesco; Pellegatta, Veronica; Tripodi, Antonio; Ramis, Gianguido; Rossetti, Ilenia

doi:10.3390/catal11080975

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…We recently demonstrated that the oxidation of ammonium can occur on the same titania-based catalyst employed so far, and in the same conditions [25,26]; subsequently, a combined photo-treatment was performed to abate, simultaneously, both nitrate and ammonium (Reaction 4).…”

Section: Combined Photo-degradation Under Visible Lightmentioning

confidence: 89%

“…Metal promotion of the catalysts was achieved through wet impregnation [16], which Lastly, a third test was carried out with a constant air supply flowing through the solution. This setup returned a small increase in the reactor performance in the case of photo-oxidation of ammonium [25]. However, Figure 10 clearly highlights a limited effect of this solution, as the conversion is only pushed up to 22%.…”

Section: Materials Preparationmentioning

confidence: 94%

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Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

et al. 2022

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Bare titania and metal-promoted TiO2 catalysts were employed in the treatment of nitrates, which are ubiquitous pollutants of wastewater. The results show that the process can be carried out under visible light (from a white light LED lamp) and, in the best case, 23.5% conversion of nitrate was obtained over 4 h with full selectivity towards N2 by employing 0.1 mol% Ag/TiO2 prepared by flame spray pyrolysis. Moreover, the performance was worse when testing the same catalysts with tap water (11.3% conversion), due to the more complex composition of the matrix. Finally, it was found that photoreduction of nitrate can be effectively performed in combination with photo-oxidation of ammonium without loss in the activity, opening up the possibility of treating highly polluted wastewater with a single process. The latter treatment employs the two contaminants simultaneously as electron and holes scavengers, with very good selectivity, in a completely new process that we may call Photo-Selective Catalytic Reduction (Photo-SCR).

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Section: Combined Photo-degradation Under Visible Lightmentioning

confidence: 89%

Section: Materials Preparationmentioning

confidence: 94%

Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

et al. 2022

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“…We have recently demonstrated that the oxidation of ammonium can occur on the same titania-based catalyst employed so far and in the same conditions [22,23], then, a combined photo-treatment was performed to abate simultaneously both nitrate and ammonium. The ratio between the reactants was set to the stoichiometric and the degradation was performed in three configurations in order to boost the reactions.…”

Section: Comparison Of Different Photocatalystsmentioning

confidence: 89%

“…Lastly, a third test was carried out with a constant air supply flowing through the solution. This setup returned a small increase in the reactor performance in case of photo-oxidation of ammonium [22]. However, Figure 9 clearly highlights a limited effect of this solution, as the conversion is only pushed up to a 22%.…”

Section: Comparison Of Different Photocatalystsmentioning

confidence: 91%

Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

Conte¹,

Pellegatta²,

Ramis³

et al. 2022

Preprint

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Bare titania and metal promoted TiO2 catalysts were employed in the treatment of nitrates, which are ubiquitous pollutants of wastewater. The results show that the process can be carried out under visible light (from white light LED lamp) and, in the best case, 23.5% conversion of nitrate was obtained over 4 hours with full selectivity towards N2 by employing 0.1 mol% Ag/TiO2 prepared by flame spray pyrolysis. Moreover, the performance was worse when testing the same catalysts with tap water (11.3% conversion), due to the more complex composition of the matrix. At last, it was found that the photoreduction of nitrate can be effectively performed in combina-tion with the photo-oxidation of ammonium without loss in the activity, opening to the possi-bility to treat highly polluted wastewater with a single process. The latter treatment employs the two contaminants simultaneously as electron and holes scavengers, with very good selectiv-ity, in a completely new process that we may call Photo-Selective Catalytic Reduction (Pho-to-SCR).

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“…The Photo-Fenton reaction was carried out first under visible light in order to optimize all the reaction parameters, since a similar setup was adopted successfully during previous investigations with an azo-type dye. [38] First of all, the impact of the pollutant concentration has been investigated on conversion. Four solutions of DCF in the range 12-100 ppm were prepared and tested with reactor A.…”

Section: Photo-fenton Reactionmentioning

confidence: 99%

Comparison of Different Advanced Oxidation Processes (AOPs) and Photocatalysts for the Degradation of Diclofenac

Conte,

Tommasi,

Degerli

et al. 2024

ChemPhotoChem

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Diclofenac sodium salt was photodegraded by means of advanced oxidation processes (AOPs), such as Fenton, photo‐Fenton and heterogeneous photocatalysis. For the latter different photocatalysts were compared, namely commercial titania P25 and titania metallized with gold (0.1% Au/P25), silver (1% Ag/P25) and palladium (0.1% Pd/P25). Homogeneous treatments demonstrated effective in the degradation of the selected pollutant (>80% conversion @2h) when the irradiation occurred within the solution. Also, photo‐Fenton process assisted by visible light rather than UV was effective but slower and characterized by a toxicity of the residual solution due to unreacted H2O2. The photocatalyzed treatment performed at its best when P25 was used (70% conversion @2h), while modified photocatalysts reached the same conversion when H2O2 was added to the solution. Overall, in vitro toxicity tests using Daphnia Magna unveiled that the wastewater treated via M/TiO2 treatment and photo‐Fenton under UV in combination with H2O2 showed an acute toxicity comparable with the control group (almost 100% viability @48h). Conversely, the other processes failed to degrade completely either the pollutant or the hydrogen peroxide, leading to the mortality of 30‐80% of the individuals.

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Photo-Oxidation of Ammonia to Molecular Nitrogen in Water under UV, Vis and Sunlight Irradiation

Cited by 6 publications

References 34 publications

Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium

Comparison of Different Advanced Oxidation Processes (AOPs) and Photocatalysts for the Degradation of Diclofenac

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