用于放射性废水处理的高比表面多孔六氰合铁钛钾/二氧化硅小球的制备

摘要

采用一种新方法合成了由六氰合铁钛钾(PTH)与二氧化硅组成的多孔球形杂化材料.其过程分为两步:首先将无定型二氧化钛接枝于球形二氧化硅载体的孔壁上:然后利用TiO2+和IG[Fe(CN)6]的反应将孔道内的二氧化钛转化为PTH.所制备的杂化材料通过低温氮吸附、XRD、FTIR和XPS等方法进行了表征.结果表明PTH涂层被成功负载于二氧化硅小球的内部孔壁上.所得杂化材料在高酸度和高盐度的情况下仍然对Cs+离子表现出了很强的去除能力和很高的分配系数.%Porous composite beads composed of potassium titanium hexacynoferrate (PTH) and silica was preparedwith a method developed in this work. The method could be divided in two steps: the first was grafting amorphoustitania onto the wall of pores in silica bead support, the second was converting the tinania inside the pores into PTHby the reaction between TiO2+ and K4[Fe(CN)6]. The as-made composites were characterized by low temperaturenitrogen adsorption-desorption, XRD, FFIR and XPS. The results show that the PTH layer is coated successfully ontothe wall of pores in silica bead. The as-made composites exhibit high Cs+ removal ability and distribution coefficienteven under high acidity and salinity.