采用水热合成法制备了Keggin型结构的Ni-Mo-Zr杂多酸盐,并利用红外光谱(IR)和X射线衍射仪(XRD)对合成的产物进行了表征. 以酸性绿B(AGB)为目标物,研究了在超声波辐射下,Ni-Mo-Zr杂多酸盐的投加量、染料废水初始浓度、pH值等因素对降解效果的影响. 结果表明,新合成的杂多酸盐具有Keggin型结构. 当将其作为催化剂、投加量为0.8 g/L、染料废水的初始浓度为10 mg/L、初始pH=5时,用40 kHz超声频率辐射60 min,染料废水的降解率最高可达90.2%. 通过动力学分析,降解反应符合一级反应动力学模型,降解速率随初始浓度的增加而减小.
The Ni-Mo-Zr heteropoly salt with Keggin structure has been hydrothermally synthesized and characterized by IR and XRD. Efficiency of ultrasonic degradation of the heteropoly salt for the acidic-green B (AGB) dye as the objective compound was investigated, and the influence factors on the ultrasonic degradation efficiency, such as the amount of the heteropoly salt, the initial concentration and the pH value of the acidic-green B dye wastewater, were explored. The results show that newly synthesized Ni-Mo-Zr heteropoly salt had Keggin structure. When the amount of the heteropoly salt was 0. 8 g/L, the initial concentration of the dye wastewater was 10 mg/L and the initial pH value of the wastewater was 5.0, and ultrasonic irradiation was carried out for 60 min at 40 kHz, the degradation rate was optimum and up to 90.2%. After dynamics analysis, it showed the degradation reaction was in accord with the first order dynamics model, and the degradation rate was decreased with the increasing of the initial concentration of the acidic-green B.
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