Wydział Chemii

Maja Orłowska

Andrzej M. Kłonkowski

Julia Jezierska

Jacek Ryl

2013

Sensors and Actuators B-Chemical

186

396-406

10.1016/j.snb.2013.06.010

Naukowa

Angielski

Artykuł

A recognition material consisting of silica xerogel with amino-modified surface selectively recognizes Pb²⁺ and Cu²⁺ (but only in presence of Pb²⁺ ions) in aqueous solutions of other metal ions. The analytical action of the material is based on a significant change in luminescence emission spectra of the material after chemisorption of Pb²⁺ ions. In the presence of Pb²⁺ in octahedral coordination environment, a new broad and strong emission band appears which is peaking at 443 nm (λ_exc = 236 nm) ascribed to electronic transition in Pb²⁺ complex. On the other hand, the presence of Cu²⁺ cations causes significant depression of the Pb²⁺ luminescence. The material plays a role of INHIBIT logic gate for both the mentioned cations.

Pb²⁺ can be analyzed quantitatively but Cu²⁺ only qualitatively in presence of Pb²⁺. The material can be regenerated after chemisorption and is photochemically stable during UV illumination. Besides the surface of the modified silica support is analyzed by SEM and XPS techniques and coordination sphere of the chemisorbed Cu²⁺ ions is determined by electron paramagnetic resonance (EPR).

luminescence recognition material, Pb2+, Cu2+, Selectivity, logic gate

http://dx.doi.org/10.1016/j.snb.2013.06.010

http://www.elsevier.com