Abstract:
Micro-crystals of complex Cu
2(tpa)
2(OH)
n were prepared using CuCl
2∙2H
2O and trizole-pyridyl carboxylic acid (Htpa) as raw material in DMF/methanol solvent by a solvent volatilization method. The synthesized Cu(Ⅱ) complex micro-crystals were characterized by infrared spectroscopy, scanning electron microscope, X-ray powder diffraction and UV-Vis diffuse reflection spectroscopy. The photocatalytic system consisting of Cu
2(tpa)
2(OH)
n and H
2O
2 was used to degrade the alkaline fuchsin and rhodamine B dyes under visible light, and the degradation process of alkaline fuchsin and rhodamine B was simulated by kinetic models. The results showed that Cu
2(tpa)
2(OH)
n/H
2O
2 catalytic system exhibited good photocatalytic activities for the degradation of alkaline fuchsin and rhodamine B dyes. The degradation efficiency of alkaline fuchsin was up to 84.0% after reacting for 90 min, while the degradation efficiency of rhodamine B was up to 96.3% after reacting for 25 min. The reaction kinetic study suggested that the photodegradation processes of alkaline fuchsin and rhodamine B were in accordance with the pseudo-first-order kinetic model. The rate constants (
k) of alkaline fuchsin and rhodamine B are 2.030 × 10
−2 min
−1 and 1.246 × 10
−1 min
−1, respectively. Finally, the mechanism of photocatalytic degradation of organic dyes by Cu
2(tpa)
2(OH)
n/H
2O
2 system was discussed.