钒酸铁类Fenton催化剂的制备及性能研究

在不同酸碱条件下,采用水热法制备了FeVO4催化剂,利用XRD、TEM、FTIR对产物表征,并将其作为非均相类Fenton催化剂氧化降解有机染料罗丹明B,研究了初始反应溶液pH值、类Fenton试剂中各组分的浓度、钒酸铁催化剂的制备条件等因素对类Fenton反应效率的影响.结果表明,制备的钒酸铁为FeVO4﹒1.25H2O,在优化条件下降解罗丹明B时60min内脱色率可达97%以上.与传统Fenton试剂相比,类Fenton催化剂具有更广泛的pH适用范围,易于与水分离,应用前景广阔.

Preparation of iron (III) vanadate Fenton-like catalyst and its catalytic performance

Iron (III) vanadate catalysts were prepared by a hydrothermal method under different acid-base. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier Transform infrared spectroscopy (FTIR). The as-prepared samples were used as Fenton-like catalysts on the degradation of Rhodamine B (Rh B) which was used as a model pollutant. The effects of pH value, H2O2 concentration, iron (III) vanadate concentration and the type of iron (III) vanadate on the heterogeneous Fenton-like degradation of Rh B were investigated. The XRD patterns indicate that Iron (III) vanadate samples were FeVO4·1.25 H2O. The decolorization rate of Rh B at 60 min could reach 97% at the optimal operating conditions. The range of pH values which the FeVO4·1.25 H2O was appropriate was found to be much wider than that of the classic Fenton's reagent. Moreover, FeVO4·1.25 H2O samples could be reutilized for the perfect settling performance. The Fenton-like catalysts may have a better prospect of application in wastewater treatment.