Study on synthesis, characterization and ultrasonic degradation the dyeing wastewater of 11-MnZrMo heteropoly salt with Keggin structure

The heteropoly salt, Na-6[Mn(Mo11ZrO39)] center dot 19H(2)O (MnZrMo) with Keggin structure of the 1:1:11 series, was synthesized by the aqueous solution method, and characterized and analyzed. The element analysis showed that the molar ratio of Mn, Zr and Mo was accord with 1:1:11; the thermogravimetric analysis/ differential thermal analysis(TG/DTA) indicated that the MnZrMo had good thermal stability and it contained nineteen molecules of crystallization water; the characterization of the fourier transform infrared spectroscopy(FT-IR),X-ray powder diffraction analysis(XRD) and the ultraviolet spectrum(UV) showed that the anionic of the MnZrMo heteropoly salt possessed Keggin structure; the analysis of the scanning electron microscopy(SEM) showed that it had the basic feature of the macromolecular compound and a regular crystal. The MnZrMo heteropoly salt was used as the catalyst to degrade the acidic-green B(AGB) dyeing wastewater enhanced by the ultrasonic, the degradation rate could reach 95.90%.