Efficient Photoelectrochemical Reduction of Nitrite to Ammonium and Nitrogen Containing Gaseous Species Using Ti/TiO<sub>2</sub>Nanotube Electrodes

Sayão, Fabiana A.; Nuñez, Luciana; Zanoni, María Valnice Boldrin

doi:10.5935/0103-5053.20140091

Cited by 7 publications

(8 citation statements)

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“…The use of photoelectrocatalysis for nitrate reduction performed on TiO 2 NT photocathode has also been reported in the literature [173]; 100 % of nitrate removal was reached after 6 min of treatment conducted in NaCl 7 mmol L −1 , pH 7, in the absence of dissolved oxygen, under UV irradiation and applied potential of −0.2 V vs. Ag/AgCl. Nitrate conversion led to 7 % ammonium and 93 % nitrogen gaseous species generation.…”

Section: Removal Of Inorganic Pollutantsmentioning

confidence: 90%

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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Section: Removal Of Inorganic Pollutantsmentioning

confidence: 90%

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

et al. 2015

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“…This would obviously increase operation cost and may bring secondary pollution. In the case of many reported photoelectrochemical denitrification systems, the semiconductors were set as the photocathode and additional electric energy input is crucial to give a bias potential at the cathode . Although a recent study revealed the bias potential for photocathode can be imposed though coupling an acetate utilizing bioanode without electric energy input, the consumption of organics at the anode side would still fall in the limitation of additional chemicals dosing .…”

Section: Discussionmentioning

confidence: 99%

“…In the case of many reported photoelectrochemical denitrification systems, the semiconductors were set as the photocathode and additional electric energy input is crucial to give a bias potential at the cathode. 28 Although a recent study revealed the bias potential for photocathode can be imposed though coupling an acetate utilizing bioanode without electric energy input, the consumption of organics at the anode side would still fall in the limitation of additional chemicals dosing. 20 Unlike these photoinduced denitrification systems, the photoelectrotrophic denitrification (PEDeN) system reported here was set by coupling the photoanode to an electrotrophic denitrification (EDeN) biocathode.…”

Section: ■ Discussionmentioning

confidence: 99%

Microbial Photoelectrotrophic Denitrification as a Sustainable and Efficient Way for Reducing Nitrate to Nitrogen

Cheng

Tian

et al. 2017

Environ. Sci. Technol.

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Biological removal of nitrate, a highly concerning contaminant, is limited when the aqueous environment lacks bioavailable electron donors. In this study, we demonstrated, for the first time, that bacteria can directly use the electrons originated from the photoelectrochemical process to carry out the denitrification. In such photoelectrotrophic denitrification (PEDeN) systems (denitrification biocathode coupling with TiO photoanode), nitrogen removal was verified solely relying on the illumination dosing without consuming additional chemical reductant or electric power. Under the UV illumination (30 mW·cm, wavelength at 380 ± 20 nm), nitrate reduction in PEDeN apparently followed the first-order kinetics with a constant of 0.13 ± 0.023 h. Nitrate was found to be almost completely converted to nitrogen gas at the end of batch test. Compared to the electrotrophic denitrification systems driven by organics (OEDeN, biocathode/acetate consuming bioanode) or electricity (EEDeN, biocathode/abiotic anode), the denitrification rate in PEDeN equaled that in OEDeN with a COD/N ratio of 9.0 or that in EEDeN with an applied voltage at 2.0 V. This study provides a sustainable technical approach for eliminating nitrate from water. PEDeN as a novel microbial metabolism may shed further light onto the role of sunlight played in the nitrogen cycling in certain semiconductive and conductive minerals-enriched aqueous environment.

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“…In principle, the conventional technologies for nitrite conversion have contained physical, micbiological and chemical methods [15][16][17]. Physical methods that including ionic membrane, reverse osmosis and electron dialysis usually present the advantage to minimize nitrite concentration in a large scale.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic conversion of nitrite in aqueous solution over nanocomposite photocatalyst Er3+:Y3Al5O12/BiPO4 using different photosources

Wang

et al. 2017

Journal of Industrial and Engineering Chemistry

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/mMBIP) and their nanocomposite photocatalyst (Er 3+ :Y 3 Al 5 O 12 /(H-nM-mM)BIP) were prepared by hydrothermal, ultrasonic dispersion and liquid boiling methods. The prepared photocatalysts were characterized by X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectra (DRS). The catalytic activity of prepared photocatalysts was evaluated via photocatalytic conversion rate of nitrite under ultraviolet-light, visible-light and simulated solar-light irradiations. These three photocatalysts all exhibited excellent performance under simulated solar-light irradiation and reached 85.36 %, 84.42 % and 78.53 % conversion rates, respectively, for Er 3+ :

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Efficient Photoelectrochemical Reduction of Nitrite to Ammonium and Nitrogen Containing Gaseous Species Using Ti/TiO₂Nanotube Electrodes

Cited by 7 publications

References 0 publications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Microbial Photoelectrotrophic Denitrification as a Sustainable and Efficient Way for Reducing Nitrate to Nitrogen

Photocatalytic conversion of nitrite in aqueous solution over nanocomposite photocatalyst Er3+:Y3Al5O12/BiPO4 using different photosources

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Efficient Photoelectrochemical Reduction of Nitrite to Ammonium and Nitrogen Containing Gaseous Species Using Ti/TiO2Nanotube Electrodes

Cited by 7 publications

References 0 publications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Microbial Photoelectrotrophic Denitrification as a Sustainable and Efficient Way for Reducing Nitrate to Nitrogen

Photocatalytic conversion of nitrite in aqueous solution over nanocomposite photocatalyst Er3+:Y3Al5O12/BiPO4 using different photosources

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Efficient Photoelectrochemical Reduction of Nitrite to Ammonium and Nitrogen Containing Gaseous Species Using Ti/TiO₂Nanotube Electrodes