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挤压法制备Fe-Al-Ce复合氧化物颗粒除氟性能及地下水处理应用

Keywords: 铁铝铈氧化物,,吸附,颗粒

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Abstract:

利用粘结挤压法将Fe-Al-Ce复合氧化物粉末材料制备成颗粒材料(GFAC),进行表征、静态和动态吸附除氟性能评价和现场应用。结果显示,优选GFAC颗粒直径为1.6mm,具有较高的压缩破坏强度33.80N和除氟性能。GFAC颗粒对氟的吸附过程符合准二级反应动力学方程,吸附速率受膜扩散和内扩散共同控制;在pH7.0±0.2条件下,GFAC颗粒对氟的饱和吸附容量达到51.28mg/g(25℃,Langmuir等温吸附模型)。不同空间流速(SV)下动态实验出水穿透(1mg/L)时对氟的累积吸附量分别为5.69mg/g(SV=1h-1)、5.61mg/g(SV=2h-1)、2.83mg/g(SV=5h-1),高于常见活性氧化铝除氟剂(AA,1.77mg/g,SV=1h-1)及其他报道的颗粒除氟剂。GFAC颗粒在河北现场成功用于实际高氟地下水的处理,在原水氟浓度(3.7±0.3)mg/L和pH8.0±0.2条件下,对氟的累计吸附量为3.16mg/g,明显高于AA(0.83mg/g),具有较好的应用前景。

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