Abstract
The H3PW12O40@C photocatalysts synthesized in situ from dodetungstophosphoric acid (TPA) and soluble starch were studied and characterized by FTIR, XRD, scanning electron microscope, and energy dispersive X-ray analysis. The degradation of rhodamine B (RhB) wastewater with H3PW12O40@C photocatalysts and hydrogen peroxide was investigated under ultraviolet irradiation. The effect of different factors and synergetic effect on the degradation of RhB were studied and the mechanism of catalytic oxidation of RhB was discussed. The results showed that the RhB was degraded efficiently. The decoloration efficiency of the RhB was up to 94.6% with initial pH value of 6 and RhB concentration of 100 mg/L under better reaction conditions (i.e. hydrogen peroxide concentration of 12 mM, PW30 (represented raw materials formula according to weight ratio of TPA to soluble starch is 30%) mass of 1.0 g/L, reaction temperature of 25°C, the high pressure mercury lamp power of 500 W, and the radiation time of 70 min). Degradation process of RhB wastewater by ultraviolet, hydrogen peroxide, and PW30 has synergetic effect.
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