Gels, Vol. 11, Pages 580: Monitoring Lead–Phosphorus Interactions Through 31P-NMR Used as a Sensor in Phosphine Functionalized Silica Gel Adsorbent

Gels doi: 10.3390/gels11080580

Authors:
Jessica Badillo-Camacho
José A. Gutiérrez-Ortega
Ilya G. Shenderovich
Yenni G. Velázquez-Galván
Ricardo Manríquez-González

A triphenylphosphine-functionalized silica gel material, optimized for lead adsorption, was synthesized via a one-pot sol–gel reaction and characterized using FTIR and solid-state 13C and 29Si NMR and XPS spectroscopy. The interaction between lead cations and phosphine groups was evaluated using the 31P NMR chemical shift tensor as a sensor. Two distinct types of phosphine groups, exhibiting different rotational mobility behaviors, were identified, with their ratio influenced by the presence of lead cations. These results suggest that the adsorption behavior of lead on this functionalized silica gel adsorbent can be directly evaluated by its lead–phosphorus interaction. This association was corroborated by the shifting of the binding energies of phosphorus functional groups after lead uptake in the XPS analysis.

Source link

Jessica Badillo-Camacho www.mdpi.com