Effect of Cu-Pd-TiO2 Polymetallic Nanoelectrode to Remove NO3--N in Groundwater Under Different Conditions

Abstract

Abstract:

Taking Pt as anode, and taking the polymetallic nanoelectrode (Cu-Pd-TiO₂) formed by a thin Cu and Pd layer coating on the Ti nanotubes as cathode, the authors constructed an electrochemical reactor for NO₃^--N removal, and observed the removal rates of the polymetallic nanoelectrode to NO₃^--N under different conditions such as current density, initial concentrations, pH influence, and so on.The results showed that using the Cu-Pd-TiO₂ polymetallic nanoelectrode,the nitrate removal rate can reach 81% in the presence of 0.50 g/L Na₂SO₄ with the current density of 30 mA/cm² after 90 min electrolysis,and that under the same conditions, the removal rate of the Ti electrode as cathode was 24.5%. The pH had little effect on the NO₃^--N removal rate. For the same initial nitrate concentration, the NO₃^--N removal rate increased with increasing current density. The NO₃^--N reduction efficiency declined slightly as the initial nitrate concentration increased.

Key words: polymetal nanoelectrode, nitrate, nanotube, anode, cathode

CLC Number:

P641.3

LIU Fang, LI Miao, ZHOU Fang, HU Weiwu, WANG Lele, LIU Xiang. Effect of Cu-Pd-TiO₂ Polymetallic Nanoelectrode to Remove NO₃^--N in Groundwater Under Different Conditions[J]. Geoscience, 2017, 31(03): 623-628.

Figures/Tables 6

Fig.1 Schematic diagram of the electrochemical apparatus

Fig.2 Contrast of the removal effect of different electrodes on nitrate nitrogen

Fig.3 Field-emission scanning electron microscopy images of the Ti electrode surface, Ti nanoelectrode surface, and Cu-Pd-TiO2 nanoelectrode surface

Fig.4 Effects of the initial nitrate concentration on changes of the nitrate concentration with time

Fig.5 Effects of the current density on changes of the nitrate concentration with time

Fig.6 Effects of the pH on changes of the nitrate concentration with time

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Effect of Cu-Pd-TiO₂ Polymetallic Nanoelectrode to Remove NO₃^--N in Groundwater Under Different Conditions

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