Abstract
A copper (I) polymer, [Cu2Mg(pzdc)2(H2O)5•2H2O]n (pzdc = 2,3-Pyrazinedicarboxylic acid), was synthesized by solvothermal method. The complex was characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectrophotometry (UV-Vis), and element analysis. X-ray crystal structure analysis reveals that the complex is a two-dimensional coordination polymer. The photophysical and luminescent properties of the complex were investigated. At room temperature, the complex exhibits reversible double strands cyclic voltammogram and displays efficient blue emission with peak maxima at 468 nm. Catalytic liquid phase oxidation of dyes and glyphosate was carried out using the copper (I) polymer as catalyst and H2O2 as oxidant. Degradation efficiencies were evaluated by varying the reaction conditions (i.e. illumination and oxidant). In the degradation reactions, the polymer exhibits high degradation efficiency within a short reaction time under the optimum reaction conditions. Furthermore, the reusability of the catalyst is excellent, showing no activity loss in four repeated cycles. The possible reaction mechanism catalyzed by the polymer was inferred on the basis of the results of electron spin resonance (ESR), electrochemical and ion chromatography analyses (IC).
Highlights
Coordination polymers have received considerable attention because of their unique characteristics in terms of magnetic behaviors, optical activities as well as catalytic and luminescent properties
Powder X-ray diffraction (PXRD) measurements were performed at room temperature on a Philips X’pert MPD Pro X-ray diffractometer using Cu Kα radiation (λ = 0.154 18 nm), with the X-ray tube operated at 40 kV and 40 mA
It was observed that the redox reaction is a slow process and cuprous ion in diluted concentration is beneficial to the growth of single crystals
Summary
Coordination polymers have received considerable attention because of their unique characteristics in terms of magnetic behaviors, optical activities as well as catalytic and luminescent properties. Copper-based complexes have been used in a wide range of catalytic reactions[27,28,29]. We report the outstanding photocatalytic performance of the copper (I) polymer in the degradation of dyes and glyphosate, and conduct discussion on the related mechanism.
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