Abstract
Two compounds [BiI4(phen)·(Hphen)]2 (1) and Bi(phen)2(NO3)3 (2) were synthesized by the solution volatilization method. They were characterized by elemental analysis, IR spectroscopy, UV–vis spectroscopy, X-ray powder diffraction, and thermogravimetric analysis in detail. The experimental results show that compound 1 can not only degrade organic cationic dyes: Rhodamine B (RhB), Methylene Blue (MB), Crystal Violet (CV), and neutral dye Rose Bengal sodium salt (RBS) under visible light, but also adsorb anionic dyes Eosin, Coomassie Brilliant Blue (CBB) and Methyl Orange (MO). Compound 1 could photocatalytic degradation of mixed organic dyes, and distinguish them. After adsorption of CBB, compound 1 still had nearly identical for MB and CV by photocatalytic degradation effects. The kinetic study shows that the photocatalytic process is suitable to the pseudo-first-order kinetic equation, while the adsorption process belongs to the pseudo-second-order kinetic equation. By capturing the experiment and solid fluorescence spectrum, it was demonstrated that the photocatalytic is a free radical reaction. The adsorption mechanism was further investigated through atomic force microscopy and theoretical calculation. In addition, the photocatalytic degradation efficiency of compound 1 remained above 90% after 5 cycles. Therefore, compound 1 can be used as a potential catalyst in dye wastewater treatment.
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