Details
| Original language | English |
|---|---|
| Pages (from-to) | 406-414 |
| Number of pages | 9 |
| Journal | Applied Catalysis B: Environmental |
| Volume | 225 |
| Early online date | 11 Dec 2017 |
| Publication status | Published - 5 Jun 2018 |
Abstract
Peroxymonosulfate (PMS) is being extensively investigated as an eco-friendly oxidant and various activation methods of PMS have been investigated. Here we demonstrated a new method of catalytic PMS activation, which employed amino acids as both a visible light sensitizer and a substrate to be degraded. Although PMS and amino acids do not absorb any visible light, the surface adsorption of amino acids on titania formed charge-transfer complexes that absorb visible light (λ > 420 nm). Serine and histidine were employed as main target amino acids and their surface complexes on TiO 2 were characterized by various spectroscopic methods The ligand-to-metal charge transfer between amino acids and TiO 2 enabled the absorption of visible light and the subsequent electron transfer catalytically activated PMS with generating sulfate radicals which were detected by electron paramagnetic resonance analysis. Based on various scavenger tests, amino acids seem to be degraded mainly by sulfate radical (radical pathway) and by a non-radical pathway (PMS serving primarily as an electron acceptor) to some extent. Amino acids were degraded with producing ammonium as a sole nitrogenous product in this process, whereas most advanced oxidation processes of amino acid generate not only ammonium but also nitrate and nitrite. The visible light-induced charge transfer characteristics of the amino acid-TiO 2 complexes were demonstrated by the photoelectrochemical characterizations and the time-resolved laser spectroscopic analysis.
Keywords
- Advanced oxidation process (AOP), Amino acid degradation, Sulfate radical, Surface complex, Visible light activation of PMS
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Environmental Science(all)
- General Environmental Science
- Chemical Engineering(all)
- Process Chemistry and Technology
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In: Applied Catalysis B: Environmental, Vol. 225, 05.06.2018, p. 406-414.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Visible light-induced catalytic activation of peroxymonosulfate using heterogeneous surface complexes of amino acids on TiO2
AU - Lim, Jonghun
AU - Kwak, Dong-yeob
AU - Sieland, Fabian
AU - Kim, Chuhyung
AU - Bahnemann, Detlef W.
AU - Choi, Wonyong
N1 - © 2017 Elsevier B.V. All rights reserved.
PY - 2018/6/5
Y1 - 2018/6/5
N2 - Peroxymonosulfate (PMS) is being extensively investigated as an eco-friendly oxidant and various activation methods of PMS have been investigated. Here we demonstrated a new method of catalytic PMS activation, which employed amino acids as both a visible light sensitizer and a substrate to be degraded. Although PMS and amino acids do not absorb any visible light, the surface adsorption of amino acids on titania formed charge-transfer complexes that absorb visible light (λ > 420 nm). Serine and histidine were employed as main target amino acids and their surface complexes on TiO 2 were characterized by various spectroscopic methods The ligand-to-metal charge transfer between amino acids and TiO 2 enabled the absorption of visible light and the subsequent electron transfer catalytically activated PMS with generating sulfate radicals which were detected by electron paramagnetic resonance analysis. Based on various scavenger tests, amino acids seem to be degraded mainly by sulfate radical (radical pathway) and by a non-radical pathway (PMS serving primarily as an electron acceptor) to some extent. Amino acids were degraded with producing ammonium as a sole nitrogenous product in this process, whereas most advanced oxidation processes of amino acid generate not only ammonium but also nitrate and nitrite. The visible light-induced charge transfer characteristics of the amino acid-TiO 2 complexes were demonstrated by the photoelectrochemical characterizations and the time-resolved laser spectroscopic analysis.
AB - Peroxymonosulfate (PMS) is being extensively investigated as an eco-friendly oxidant and various activation methods of PMS have been investigated. Here we demonstrated a new method of catalytic PMS activation, which employed amino acids as both a visible light sensitizer and a substrate to be degraded. Although PMS and amino acids do not absorb any visible light, the surface adsorption of amino acids on titania formed charge-transfer complexes that absorb visible light (λ > 420 nm). Serine and histidine were employed as main target amino acids and their surface complexes on TiO 2 were characterized by various spectroscopic methods The ligand-to-metal charge transfer between amino acids and TiO 2 enabled the absorption of visible light and the subsequent electron transfer catalytically activated PMS with generating sulfate radicals which were detected by electron paramagnetic resonance analysis. Based on various scavenger tests, amino acids seem to be degraded mainly by sulfate radical (radical pathway) and by a non-radical pathway (PMS serving primarily as an electron acceptor) to some extent. Amino acids were degraded with producing ammonium as a sole nitrogenous product in this process, whereas most advanced oxidation processes of amino acid generate not only ammonium but also nitrate and nitrite. The visible light-induced charge transfer characteristics of the amino acid-TiO 2 complexes were demonstrated by the photoelectrochemical characterizations and the time-resolved laser spectroscopic analysis.
KW - Advanced oxidation process (AOP)
KW - Amino acid degradation
KW - Sulfate radical
KW - Surface complex
KW - Visible light activation of PMS
UR - http://www.scopus.com/inward/record.url?scp=85037994004&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2017.12.025
DO - 10.1016/j.apcatb.2017.12.025
M3 - Article
VL - 225
SP - 406
EP - 414
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
ER -