Photoinduced Reactions
between Pb<sub>3</sub>O<sub>4</sub> and Organic Dyes in Aqueous Solution
under Visible Light
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Abstract
Pb<sub>3</sub>O<sub>4</sub> could react with organic
dyes in aqueous
solution under visible light irradiation, in which Pb<sub>3</sub>O<sub>4</sub> was transformed into Pb<sub>3</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>2</sub> along with oxidation of the organic dyes. Cu<sup>2+</sup> has considerable effect on the reaction. In the presence
of Cu<sup>2+</sup>, MO (20 ppm) and RhB (10<sup>–5</sup> mol
L<sup>–1</sup>) were completely degraded under visible light
within 6 and 20 min, respectively, while both Pb<sub>3</sub>O<sub>4</sub> and Cu<sup>2+</sup> keep almost stable during photodegradation.
The mechanisms of the reactions with and without Cu<sup>2+</sup> ions
were studied. The photochemical system of Pb<sub>3</sub>O<sub>4</sub> cooperating with Cu<sup>2+</sup> ions is probably used for the treatment
of organic pollutants in water under visible light
