The electrocatalytic reduction of nitrate in water on Pd/Sn-modified activated carbon fiber electrode

Water Research
Ying WangPengju Lei

Abstract

The Pd/Sn-modified activated carbon fiber (ACF) electrodes were successfully prepared by the impregnation of Pd2+ and Sn2+ ions onto ACF, and their electrocatalytic reduction capacity for nitrate ions in water was evaluated in a batch experiment. The electrode was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS) and temperature programmed reduction (TPR). The capacity for nitrate reduction depending on Sn content on the electrode and the pH of electrolyte was discussed at length. The results showed that at an applied current density of 1.11 mA cm(-2), nitrate ions in water (solution volume: 400 mL) were reduced from 110 to 3.4 mg L(-1) after 240 min with consecutive change of intermediate nitrite. Ammonium ions and nitrogen were formed as the main final products. The amount of other possible gaseous products (including NO and N2O) was trace. With the increase of Sn content on the Pd/Sn-modified ACF electrode, the activity for nitrate reduction went up to reach a maximum (at Pd/Sn = 4) and then decreased, while the selectivity to N2 was depressed. Higher pH value of electrolyte exhibited more suppression effect on the reductio...Continue Reading

Citations

Apr 17, 2013·Journal of Environmental Sciences (China)·Haiou SongAimin Li
Apr 27, 2019·Environmental Science and Pollution Research International·Qing WangYinguang Chen
Mar 15, 2013·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Silvia C MoşneagGeorge Borodi

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