Kinetics and Mechanism of Photoelectrochemical Oxidation of Nitrite Ion by Using the Rutile Form of a TiO₂/Ti Photoelectrode with High Electric Field Enhancement

Abstract

The photoelectrochemical oxidation of nitrite ion on a rutile form of a TiO2 particulate film immobilized on a titanium plate (TiO2/Ti) with applying bias potential was studied. The experimental results indicate that the oxidation of nitrite ion is mainly affected by the applied potential and irradiation of power of light, and the oxidation is also independent of both nitrite ion concentration and pH. Theoretical analysis results correlate well with experimental ones, indicating that the reaction is of zero order with respect to the concentrations of nitrite ion and the hydroxyl ion. Meanwhile, the reaction is of 0.30 and 0.80 order with respect to the applying bias potential and the output power of light, respectively.

Electrochemical characterization of praseodymium centers in Pr x Zr1−x O2 zirconias using electrocatalysis and photoelectrocatalysis

“…Photoelectrochemical reduction of nitrite was searched on the surface of an electrochemically roughened silver electrode [36] and semiconductor photocatalysts CdS [37]. The photoelectrochemical oxidation of nitrite has been studied at TiO 2 /Ti materials [38,39]. Complementary electrocatalytic experiments on the oxygen evolution reaction (OER) were also performed.…”

Photoelectrocatalytic decomposition of dye in aqueous solution using Nafion as an electrolyte

“…The synergetic effect of UV light and electric field showed a better result on the degradation of MB. By the application of external bias voltage [12][13][14][15] to photocatalytic process (called electrochemically assisted photocatalytic process or photoelectrocatalytic process), the photocatalyst acts as photoanode and an external anodic bias is applied to drive the photogenerated electrons and holes in opposing directions so that the charge recombination is retarded.…”

Graphite-supported TiO2 for 4-nitrophenol degradation in a photoelectrocatalytic reactor

“…The photoelectrocatalytic oxidation of aniline was performed both in single and double compartment photoreactors by using TiO 2 film photoanodes prepared by direct oxidation of titanium sheets in furnace under an atmosphere of air [18]. The kinetics and mechanism of photoelectrocatalytic oxidation of nitrite ion by using the rutile form of a TiO 2 /Ti photoelectrode with high electric field enhancement were also investigated [19]. Solar photoelectrochemical reactors have been also developed [20].…”