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Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System
Urine is the main source of nitrogen pollution, while urea is a hydrogen-enriched carrier that has been ignored. Decomposition of urea to H(2) and N(2) is of great significance. Unfortunately, direct urea oxidation suffers from sluggish kinetics, and needs strong alkaline condition. Herein, we devel...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8622695/ https://www.ncbi.nlm.nih.gov/pubmed/34835546 http://dx.doi.org/10.3390/nano11112777 |
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author | Wang, Pengbo Li, Jinhua Xu, Yang Zhou, Changhui Zhang, Yan Zha, Lina Zhang, Bo Bai, Jing Zhou, Baoxue |
author_facet | Wang, Pengbo Li, Jinhua Xu, Yang Zhou, Changhui Zhang, Yan Zha, Lina Zhang, Bo Bai, Jing Zhou, Baoxue |
author_sort | Wang, Pengbo |
collection | PubMed |
description | Urine is the main source of nitrogen pollution, while urea is a hydrogen-enriched carrier that has been ignored. Decomposition of urea to H(2) and N(2) is of great significance. Unfortunately, direct urea oxidation suffers from sluggish kinetics, and needs strong alkaline condition. Herein, we developed a self-driving nano photoelectrocatalytic (PEC) system to efficiently produce hydrogen and remove total nitrogen (TN) for urine treatment under neutral pH conditions. TiO(2)/WO(3) nanosheets were used as photoanode to generate chlorine radicals (Cl•) to convert urea-nitrogen to N(2), which can promote hydrogen generation, due to the kinetic advantage of Cl(−)/Cl• cyclic catalysis. Copper nanowire electrodes (Cu NWs/CF) were employed as the cathode to produce hydrogen and simultaneously eliminate the over-oxidized nitrate-nitrogen. The self-driving was achieved based on a self-bias photoanode, consisting of confronted TiO(2)/WO(3) nanosheets and a rear Si photovoltaic cell (Si PVC). The experiment results showed that hydrogen generation with Cl• is 2.03 times higher than in urine treatment without Cl•, generating hydrogen at 66.71 μmol h(−1). At the same time, this system achieved a decomposition rate of 98.33% for urea in 2 h, with a reaction rate constant of 0.0359 min(−1). The removal rate of total nitrogen and total organic carbon (TOC) reached 75.3% and 48.4% in 2 h, respectively. This study proposes an efficient and potential urine treatment and energy recovery method in neutral solution. |
format | Online Article Text |
id | pubmed-8622695 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-86226952021-11-27 Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System Wang, Pengbo Li, Jinhua Xu, Yang Zhou, Changhui Zhang, Yan Zha, Lina Zhang, Bo Bai, Jing Zhou, Baoxue Nanomaterials (Basel) Article Urine is the main source of nitrogen pollution, while urea is a hydrogen-enriched carrier that has been ignored. Decomposition of urea to H(2) and N(2) is of great significance. Unfortunately, direct urea oxidation suffers from sluggish kinetics, and needs strong alkaline condition. Herein, we developed a self-driving nano photoelectrocatalytic (PEC) system to efficiently produce hydrogen and remove total nitrogen (TN) for urine treatment under neutral pH conditions. TiO(2)/WO(3) nanosheets were used as photoanode to generate chlorine radicals (Cl•) to convert urea-nitrogen to N(2), which can promote hydrogen generation, due to the kinetic advantage of Cl(−)/Cl• cyclic catalysis. Copper nanowire electrodes (Cu NWs/CF) were employed as the cathode to produce hydrogen and simultaneously eliminate the over-oxidized nitrate-nitrogen. The self-driving was achieved based on a self-bias photoanode, consisting of confronted TiO(2)/WO(3) nanosheets and a rear Si photovoltaic cell (Si PVC). The experiment results showed that hydrogen generation with Cl• is 2.03 times higher than in urine treatment without Cl•, generating hydrogen at 66.71 μmol h(−1). At the same time, this system achieved a decomposition rate of 98.33% for urea in 2 h, with a reaction rate constant of 0.0359 min(−1). The removal rate of total nitrogen and total organic carbon (TOC) reached 75.3% and 48.4% in 2 h, respectively. This study proposes an efficient and potential urine treatment and energy recovery method in neutral solution. MDPI 2021-10-20 /pmc/articles/PMC8622695/ /pubmed/34835546 http://dx.doi.org/10.3390/nano11112777 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Pengbo Li, Jinhua Xu, Yang Zhou, Changhui Zhang, Yan Zha, Lina Zhang, Bo Bai, Jing Zhou, Baoxue Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title | Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title_full | Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title_fullStr | Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title_full_unstemmed | Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title_short | Efficient Hydrogen Generation and Total Nitrogen Removal for Urine Treatment in a Neutral Solution Based on a Self-Driving Nano Photoelectrocatalytic System |
title_sort | efficient hydrogen generation and total nitrogen removal for urine treatment in a neutral solution based on a self-driving nano photoelectrocatalytic system |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8622695/ https://www.ncbi.nlm.nih.gov/pubmed/34835546 http://dx.doi.org/10.3390/nano11112777 |
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