1 research outputs found
Lower Rim-Modified Calix[4]arene–Bentonite Hybrid System as a Green, Reversible, and Selective Colorimetric Sensor for Hg<sup>2+</sup> Recognition
A new
quinaldine-functionalized calix[4]Âarene receptor (QHQC) was
synthesized, characterized, and analyzed for its selective sensing
properties toward Hg<sup>2+</sup> ions, and the binding event with
characteristic color change can be followed by the naked eye. The
sensing process is reversible, and the detection limit for Hg<sup>2+</sup> ions is 2.95 × 10<sup>–6</sup> M. A colorimetric
solid state Hg<sup>2+</sup> sensor was fabricated by intercalating
this receptor molecule into the bentonite galleries via the ion-exchange
method. This organic–inorganic hybrid sensor shows properties
analogous to the receptor molecule and effectively detects Hg<sup>2+</sup> ions rapidly with visual color change. The solid state Hg<sup>2+</sup> sensor is economically affordable, environmentally benign,
portable, reversible, and reusable