CORRELATION OF LANGMUIR ISOTHERM, OPTICAL, SURFACE POTENTIAL AND MORPHOLOGICAL CHARACTERIZATIONS OF TWO FUNCTIONALIZED DIHYDROXYCALIX[4]ARENE FOR LEAD CATION ENTRAPMENT

  • Faridah Lisa Supian Department of Physics, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
  • Noor Azyyati Azahari Department of Physics, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
  • Yusnita Juahir Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
  • Nur Farah Nadia Abd Karim Department of Physics, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
  • Abdullah F. Naim Department of Physics, College of Science, King Faisal University, Saudi Arabia
Keywords: surface pressure, Calixarenes, surface potential, FESEM, lead sensor

Abstract

The versatilities of calixarenes have been known primarily in the host-guest world. In this work, two calix[4]arenes, namely C-DHC4 and N-DHC4, possess the same lower rim but are distinct in the upper rim. The Langmuir Isotherm and optical properties have been carried out using Langmuir–Blodgett trough and UV-Visible spectroscopy, respectively. The topographical image of the calix[4]arenes has been observed using FESEM, and lead cation entrapments of these calix[4]arenes have been inspected using the surface potential sensor. The isotherm graph revealed the size of each calixarene; C-DHC4 ~ 1.90 nm2 and N-DHC4 ~ 2.10 nm2. The UV-Visible result demonstrated that each calix[4]arene has two firm absorption peaks where C-DHC4 has two broad peaks, which lie in 261 and 330 nm, while N-DHC4 has two shoulders at 275 and 282 nm. FESEM images have shown the formation of calix[4]arene nanocluster. Further monitoring on the surface potential and effective dipole moment indicate that C-DHC4 perform significant and stable results in detecting Pb2+ cations compared to N-DHC4. This study has demonstrated that detection limit as low as 1.25 x 10-2 mM, making the ∆V and µ̝ measurements a reliable method for detecting Pb2+ ions and their potential in this nanosensor field.

Published
2021-12-20
Section
Original Research Articles