Sorption of some cations on ammonium molybdophosphate embedded into structure of silica and titania

Ammonium molybdophosphate (AMP) has been modified via milling in air as well as deposition onto titania and silica using mechanochemical and sol-gel techniques. Prepared AMP-containing samples have been studied using XRD, FTIR, nitrogen adsorption-desorption, and potentiometric titration. These samples have been tested as sorbent for removal of Cs+, Sr2+ and UO22+ cations from aqueous solution under the same conditions. Deposition of AMP on high-dispersed supports causes its dispersion at surface and increase accessibility of active sites to cations. As a result, specific adsorption capacity normalized to mass unit of deposited AMP is much larger than for bulk AMP. Based on studies of sample with sorbed cations, some speculations concerning the mechanism of their sorption are proposed.

Automated summary

Ammonium molybdophosphate (AMP) was modified through milling in air and deposition onto titania and silica using mechanochemical and sol-gel techniques. The prepared AMP-containing samples were analyzed using XRD, FTIR, nitrogen adsorption-desorption, and potentiometric titration. These samples were tested as sorbents for the removal of Cs+, Sr2+, and UO22+ cations from aqueous solution, showing higher specific adsorption capacity than bulk AMP. Some speculations regarding the mechanism of cation sorption were proposed based on the studies of samples with sorbed cations.