title: Efficient Immobilization of Ammonium Tungstophosphate at the Mesoporous Silica Support for the Removal of Cs Ion.
abstract: The ammonium salt of phosphotugstic acid (NH4PTA) 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 cations and nitric acid on the Cs sorption efficiency onto the composites were also studied.
authors.forename: Younjin
authors.initials: Y
authors.lastname: Park
authors.forename: Won Sik
authors.initials: WS
authors.lastname: Shin
authors.forename: Sang-June
authors.initials: SJ
authors.lastname: Choi