It is usually difficult to control the microstructure of mesoporous silica materials using coal fly ash as raw materials. In this study, amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) were prepared from coal fly ash using a novel interfacial cohydrolysis-condensation method in an alkane-aqueous system. Characterizations suggested a regular microstructure, high specific surface area (676 m²/g) as well as stable and uniformly distributed amidoxime groups in the ami-MSN framework. Furthermore, ami-MSN displays a high U(VI) removal capacity in sorption experiments (98.9% removal efficiency of 50 ppm U(VI) at a dosage of 600 mg/L). The sorption showed significant pH dependence. Introducing various cations and anions showed differing effects on sorption, which can be attributed to differing complexation abilities of ions/ami-MSN/U(VI). The sorption mechanism was also studied. In pursuit of the strategy of “treating wastewater with materials derived from waste,” this work suggests that ami-MSN can be an effective and low-cost sorbent for U(VI) removal.

通常，以粉煤灰为原料来控制介孔二氧化硅材料的微观结构是困难的。在这项研究中，使用烷烃-水体系中的新型界面共水解-缩合方法，由粉煤灰制备了由ox肟官能化的介孔二氧化硅纳米球（ami-MSN）。表征表明组织规则，高比表面积（676 m ²/ g）以及ami-MSN框架中稳定且均匀分布的mid胺肟基团。此外，ami-MSN在吸附实验中显示出高的U（VI）去除能力（在600 mg / L的剂量下，去除率为50 ppm U（VI）的98.9％）。吸附表现出显着的pH依赖性。引入各种阳离子和阴离子显示出不同的吸附效果，这可以归因于离子/ ami-MSN / U（VI）的不同络合能力。还研究了吸附机理。为了追求“用废料处理废水”的策略，这项工作表明，ami-MSN可以作为去除U（VI）的有效且低成本的吸附剂。