Metal Organic Framework‐235 (MOF‐235) Modified Carbon Paste Electrode for Catechol Determination in Water

Abstract

MOF‐235 is presented as an orange powder, with crystals of the octahedral formation. It was already used as adsorbent to remove different compounds from water; however, no attempts have been published about the exploration of the MOF‐235 application as electrochemical sensor for organic compounds yet. MOF‐235 was synthetized and after that, it was characterized by SEM, XRD and FTIR. Graphite electrodes (GEs) were modified with different MOF‐235 ratio (5 %, 7 %, 10 %, 12 % and 14 %) and these modified GEs were characterized by cyclic voltammetry (CV) measurements in order to determine the effect of MOF‐235 concentration on the current response. Results indicated that, a significant improvement on the current response was attained at MOF‐235(10 %)/GE respect to unmodified GE. This behavior is related to the pore structure and multiple active sites on the MOF surface. The performance of the MOF‐235(10 %)/GE as electrochemical sensor for detecting catechol was assessed by differential pulse voltammetry (DPV). Catechol detection response of MOF‐based sensor provided a detection limit of about 12.79 μmol L−1 with a correlation coefficient (R2) of about 0.9928 ranging from 12 to 514 μmol L−1. Finally, MOF‐235(10 %)/GE was used to determine catechol in real water matrixes.

Fe3O4@MoS2/rGO Nanocomposite/Ionic Liquid Modified Carbon Paste Electrode for Electrochemical Sensing of Dasatinib in the Presence of Doxorubicin

“…As stated in some studies, CPEs are widely employed in electrochemical research and electroanalysis, because of the simple preparation process, significant lifetime, inexpensiveness, stable response, surface renewability, and appropriateness for several sensing uses. − …”