Efficient immobilization of ammonium tungstophosphate at the mesoporous silica support for the removal of Cs Ion

The ammonium salt of phosphotugstic acid (NH₄ PTA) deposited on the surface of mesoporous silica (SBA-15) support was prepared and characterized using several analytical techniques. The spectroscopic results showed that the NH₄PTA was evenly dispersed on the internal and external silica surfaces. The ion exchange capacity tests demonstrated that the specific activity for Cs removal increased with insertion of the NH₄PTA phase on the silica surface. The results showed that the ion exchange capacity of Cs increased with increasing the PTA loading. The NH₄PTA at a loading of 50 wt% supported on silica showed the highest ion exchange capacity for Cs ion among the loading range of 20-50 wt%. The effects of co-existing Technology cations to: and Elsevier nitric acid on the Cs sorption efficiency onto the composites were also studied.