An ion imprinted amino-functionalized mesoporous sorbent for the selective minicolumn preconcentration of cadmium ions and determination by GFAAS

Abstract

An amino-functionalized mesoporous sorbent with double imprinting of Cd(ii) and surfactant micelles was prepared via the sol–gel co-condensation method.

The selective recognition mechanism of a novel highly hydrophobic ion-imprinted polymer towards Cd(ii) and its application in edible vegetable oil

“…2b), demonstrating that the obtained adsorption materials had highly porous structures with good pore connectivity. 21,22 The specic surface area, and pore diameters, and total pore volumes in IIP@RS samples were further calculated by Brunauer-Emmett-Teller and Barrett-Joyner-Halenda models, respectively. It was found that the specic surface area of IIP@RS obtained from the nitrogen isotherm was 458.7 m 2 g À1 with a total pore volume of 0.31 cm 3 g À1 .…”

“…These results suggested that the Cd( ii )-induced cavities during gel formation mainly attributed to the recognition behavior of IIP@RS toward Cd( ii ). 21,40 …”

“…These results suggested that the Cd(II)-induced cavities during gel formation mainly attributed to the recognition behavior of IIP@RS toward Cd(II). 21,40 The adsorption behavior of Cd(II) by IIP@RS and NIP@RS were analyzed using an ITC method to further explore their recognition mechanisms toward Cd(II). Similar to the binding behavior between Cd(II) and MPTMS, the adsorption process of Cd(II) by IIP@RS produced strong exothermic heat during the initial titration period.…”

An ion imprinted magnetic organosilica nanocomposite for the selective determination of traces of Cd(ii) in a minicolumn flow-through preconcentration system coupled with graphite furnace atomic absorption spectroscopy

“…As pH increases, adsorption increases mainly due to a combined effect of adsorption, electrostatic attraction (note the negative surface of silanol groups) and chelation via the deprotonation of the amino groups. 25,34…”

“…[30][31][32][33] In this regard our group has been devoted to studying SPE in ow-through systems holding an MC with ller materials (with and without II) in the last few years. 34,35 In this sense, different arrangements of ow systems using magnetic ller materials immobilized by the action of a permanent magnetic eld have been sporadically reported in the literature. Problems related to material bleeding or need for reloading between measurements discourage this approach.…”