Liuhua Su, Kan Li
Co3O4 film coated on Ti substrate is prepared using sol-gel method and applied as cathode material for electrochemical denitrification in this research. Preparation conditions including precursor coating times and calcination temperature are optimized based on NO3/C0 -N removal, NO2/C0 -N generation, NH4þ-N generation, and total nitrogen (TN) removal efficiencies. The influences of electrolysis parameters such as current density and NO3/C0 -N initial concentration are also investigated. In comparison with other common researched cathodes (Ti, Cu, and Fe2O3/Ti), Co3O4/Ti exhibits better NO3/C0 -N removal and NH4þ-N generation efficiencies. In order to remove NO3/C0 -N completely from water, Cl/C0 is added to help further oxidize NH4þ-N to N2. TN removal after 3 h treatment increases from 65% to 80%, 90% and 96% with the increase of Cl/C0 from 0 mg L/C0 1 to 500, 1000, and 1500 mg L/C0 1, respectively. The mechanisms of NO3/C0 -N reduction on cathode and NH4þ-N oxidation on anode in the absence and presence of Cl/C0 are investigated in a double-cell reactor. Actual textile wastewater containing both NO3/C0 and Cl/C0 is also treated and the Co3O4/Ti cathode exhibits excellent stability and reliability. It is interesting to find out that FeCl2-H2O2 Fenton pretreatment is needed to remove extra COD and provide more Cl/C0 to help oxidize NH4þ-N to N2 at the same time.
@article{d3f0fb91-a775-4fc2-9059-6de6a4d10a3a,
title={Electrochemical nitrate reduction by using a novel Co3O4/Ti cathode},
author={Liuhua Su and Kan Li},
year={2017},
language={en}
}TY - JOUR TI - Electrochemical nitrate reduction by using a novel Co3O4/Ti cathode AU - Liuhua Su AU - Kan Li PY - 2017 LA - en ER -
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