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Use of Visible Light Modulation Techniques in Urea Photocatalytic Degradation

1
Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
2
Department of Chemistry and Biology “A. Zambelli”, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
3
Department of Information and Electrical Engineering and Applied Mathematics, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1642; https://doi.org/10.3390/w11081642
Received: 26 July 2019 / Revised: 6 August 2019 / Accepted: 7 August 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Advances in Water and Wastewater Monitoring and Treatment Technology)
PDF [557 KB, uploaded 8 August 2019]

Abstract

The aim of this work was to analyze the effect of visible LED dimming duty-cycle modulation techniques in a photocatalytic system for urea degradation using a visible light photocatalyst immobilized on macroscopic supports. For this reason, the effect of different LED dimming techniques was investigated and compared in terms of urea degradation together with ammonia and nitrate production during the irradiation time. The experimental results evidenced that using a visible LED dimming modulation with variable-peak variable-duty pulse-width modulation (PWM) allows to improve the photocatalytic degradation process, with respect to classical LED dimming with fixed-peak fixed-duty PWM, and influences the product’s distribution of ammonia and nitrate in water. Therefore, the proof of concept herein proposed could be considered as preliminary potential results to be used in water recycling applications with a particular emphasis in recovery of urea photodegradation byproducts, such as ammonia, from wastewater that could be used as potential resources and an energy resource.
Keywords: Flat-plate photocatalytic reactor; nitrogen-doped TiO2; photocatalytic degradation of urea; LED lighting; dimming modulation; ammonia as energy resource Flat-plate photocatalytic reactor; nitrogen-doped TiO2; photocatalytic degradation of urea; LED lighting; dimming modulation; ammonia as energy resource
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Vaiano, V.; Sacco, O.; Capua, G.D.; Femia, N.; Sannino, D. Use of Visible Light Modulation Techniques in Urea Photocatalytic Degradation. Water 2019, 11, 1642.

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