期刊
WATER
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/w11122522
关键词
electrochemical advanced oxidation processes; water treatment; hydroxyl radical; persistent organic pollutant; titanium dioxide nanotubes
资金
- National Science Foundation (NSF) through the Nanotechnology-Enabled Water Treatment Nanosystems Engineering ResearchCenter [EEC-1449500]
- Research Institute of the Universidad de Lima
- FONDECYT-Peru [105-2015]
Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (E-EO; kWh m(-3) order(-1) for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased E-EO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher E-EO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.
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