Nitrate Removal on a Cu/Cu2O Photocathode under UV Irradiation and Bias Potential

Paschoal, Fabiana M. M.; Nuñez, Luciana; Lanza, Marcos R.V.; Zanoni, María Valnice Boldrin

doi:10.1515/jaots-2013-0106

Cited by 8 publications

(8 citation statements)

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“…The semiconductor materials that are applied in photoelectrocatalytic treatment of wastewater include photoanodes (n-type) and photocathodes (p-type) if oxidation or reduction is the main process at the interface [84]. Thus, photoelectrocatalysis is developed in such wastewater treatment field as: organic compounds oxidation [92,93]; inorganic ions reduction [94,95]; disinfection [96][97][98]; metal removal/recovery [99][100][101][102]; and, simultaneous generation of electricity and hydrogen [12,[103][104][105].…”

Section: Single Semiconductor Photoelectrode Materialsmentioning

confidence: 99%

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Kuśmierek

2020

Catalysts

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Industrial sources of environmental pollution generate huge amounts of industrial wastewater containing various recalcitrant organic and inorganic pollutants that are hazardous to the environment. On the other hand, industrial wastewater can be regarded as a prospective source of fresh water, energy, and valuable raw materials. Conventional sewage treatment systems are often not efficient enough for the complete degradation of pollutants and they are characterized by high energy consumption. Moreover, the chemical energy that is stored in the wastewater is wasted. A solution to these problems is an application of photoelectrocatalytic treatment methods, especially when they are coupled with energy generation. The paper presents a general overview of the semiconductor materials applied as photoelectrodes in the treatment of various pollutants. The fundamentals of photoelectrocatalytic reactions and the mechanism of pollutants treatment as well as parameters affecting the treatment process are presented. Examples of different semiconductor photoelectrodes that are applied in treatment processes are described in order to present the strengths and weaknesses of the photoelectrocatalytic treatment of industrial wastewater. This overview is an addition to the existing knowledge with a particular focus on the main experimental conditions employed in the photoelectrocatalytic degradation of various pollutants with the application of semiconductor photoelectrodes.

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Section: Single Semiconductor Photoelectrode Materialsmentioning

confidence: 99%

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Kuśmierek

2020

Catalysts

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“…5, for p-type semiconductors, when subjected to external bias potential more negative than the flat band potential, electrons are enriched in the SC surface and holes are depleted. Paschoal and collaborating colleagues [7] investigated the photoelectrocatalytic reduction of nitrate on Cu/Cu 2 O photocathodes. Under optimized conditions (applied potential of + 0.2 V, pH 7, and NaCl 0.07 M electrolyte), 93 % of nitrate is found to be removed after 75 min of treatment; 42 % of the remaining nitrate and 52 % of gaseous nitrogen were obtained from nitrate conversion in the cathodic compartment.…”

Section: Removal Of Inorganic Pollutantsmentioning

confidence: 99%

“…Nowadays, photoelectrocatalysis is a technique with consolidated principles that has gained prominence and has been successfully applied in organic compound oxidation [4][5][6], inorganic ion reduction [7,8], microorganism inactivation [9,10], CO 2 reduction [11,12], and production of electricity and hydrogen [13][14][15][16]. The subject has since been explored by several researchers and reviews of deserving notoriety [13,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

et al. 2015

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The great versatility of semiconductor materials and the possibility of generation of electrons, holes, hydroxyl radicals, and/or superoxide radicals have increased the applicability of photoelectrocatalysis dramatically in the contemporary world. Photoelectrocatalysis takes advantage of the heterogeneous photocatalytic process by applying a biased potential on a photoelectrode in which the catalyst is supported. This configuration allows more effectiveness of the separation of photogenerated charges due to light irradiation with energy being higher compared to that of the band gap energy of the semiconductor, which thereby leads to an increase in the lifetime of the electron-hole pairs. This work presents a compiled and critical review of photoelectrocatalysis, trends and future prospects of the technique applied in environmental protection studies, hydrogen generation, and water disinfection. Special attention will be focused on the applications of TiO 2 and the production of nanometric morphologies with a great improvement in the photocatalyst properties useful for the degradation of organic pollutants, the reduction of inorganic contaminants, the conversion of CO 2 , microorganism inactivation, and water splitting for hydrogen generation.

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“…The main contaminants described have been bromide, nitrate, nitrite and CO 2 . In this case, the reduction takes place at a p-type semiconductor [12]. The reduction of toxic metals (Cr 6+ to Cr 3+ ) has also been described [61] in a photoelectrocatalytic process where the cathode is Pt but is conjugated in a system where the organic molecules are oxidized simultaneously in a photocathode such as Ti/TiO 2 and the electrons are forwarded to the counter electrode, where the reduction of Cr (VI) takes place [167].…”

Section: Application Of Nanostructured Materials In Photoelectrocatalmentioning

confidence: 99%

“…They studied the use of a TiO 2 semiconductor on the photoelectrolysis of water (water splitting) under anodic bias potential in a photoelectrochemical (PEC) cell [7,8]. Nowadays, photoelectrocatalysis is an emerging field with many applications, such as organic compounds oxidation [9][10][11], inorganic ions reduction [12,13], disinfection [14,15] and production of electricity and hydrogen [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Photoelectrocatalysis Efficiency by Using Nanostructured Electrodes

Bessegato¹,

Guaraldo²,

Zanoni³

2014

Modern Electrochemical Methods in Nano, Surface and Corrosion Science

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Nitrate Removal on a Cu/Cu2O Photocathode under UV Irradiation and Bias Potential

Abstract: The present work describes a suitable method for treatment of water contaminated with nitrate by using a photo-electrochemical method. A Cu/Cu

Cited by 8 publications

References 1 publication

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Enhancement of Photoelectrocatalysis Efficiency by Using Nanostructured Electrodes

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