Design and applications of Ti nano-electrode for denitrification of groundwater.

ABSTRACT

In the present study, a Ti-nano-electrode was fabricated for electrochemical denitrification. Response surface methodology (RSM) was utilized for the optimization of the factors that influence the production of Ti nano-electrodes. Box-Behnken design was applied to develop mathematical models for predicting the best electrochemical nitrate removal geometry. Parameters interacting together can be identified in this typical electrochemical removal process. A correlation coefficient R2 > 0.90 for the mathematical model was predicted to be a high correlation between observed and predicted values. The optimal NH4F concentration, oxidation time and oxidation voltage for preparation of Ti nano-electrode in the present experiment are 0.03 wt%, 34.61 min and 6.31 V, respectively. In this case, the increase in the nitrate reduction efficiency was more d (105%) than that from an untreated electrode, and energy consumption was 4.45 × 10-4 kWh.