石英砂负载Fe^0-HAP复合材料去除含铀废水试验

Study on Removal of Uranium-bearing Wastewater by Quartz Sand Loaded Fe^0-HAP Composites

利用液相还原法合成零价铁,并将零价铁负载在羟基磷灰石上,再以石英砂作为骨架,得到稳定型石英砂负载Fe^0-HAP复合材料。通过静态试验法,考察不同粒径石英砂负载Fe^0-HAP复合材料在不同时间、铀初始浓度、投加量、pH情况下对含铀废水中铀(Ⅵ)处理的效果。研究表明,复合材料对含铀废水中铀(Ⅵ)具有良好的处理效果,在0.30~0.60 mm、0.60~1.18 mm和1.18~2.36 mm粒径复合材料投加量分别为0.1、0.1、0.2 g,含铀废水pH=4,反应时间160 min时,复合材料对含铀废水中的铀(Ⅵ)去除率达到80.60%~90.38%,吸附量8.060~9.038 mg/g。复合材料去除含铀废水中铀(Ⅵ)更符合准二级动力学模型和Langmuir吸附等温线模型。

Zero valent iron was synthesized by liquid phase reduction method and loaded on hydroxyapatite,and stable quartz sand loaded Fe^0-HAP composites was obtained applying quartz sand as skeleton.Static test method was used to investigate effect of different particle size of quartz sand loaded Fe^0-HAP composites on treatment of U(Ⅵ)in uranium-bearing wastewater under different conditions,such as time,initial concentration of uranium,dosage,and pH value.The results show that quartz sand loaded Fe^0-HAP composite has good effect on treatment of U(Ⅵ)in uranium-bearing wastewater.When dosage of composite with particle size of 0.30-0.60 mm,0.60-1.18 mm and 1.18-2.36 mm is 0.1 g,0.1 g,0.2 g respectively,and reaction time is 160 min,removal rate of U(Ⅵ)in uranium-bearing wastewater is 80.60%-90.38%and adsorption capacity is 8.060-9.038 mg/g.Removal of U(Ⅵ)from uranium-bearing wastewater by quartz sand loaded Fe^0-HAP composites is more consistent with pseudo-second-order kinetic model and Langmuir adsorption isotherm model.