ZrO₂ supported Nano-ZSM-5 nanocomposite material for the nanomolar electrochemical detection of metol and bisphenol A

Abstract

ZrO 2 decorated nanocrystalline ZSM-5 nanocomposites with different weight ratios were prepared by the calcination of physical mixture of nanocrystalline ZrO 2 and Nano-ZSM-5.Material was characterized by the complementary combination of X-ray diffraction, N 2adsorption, and transmission/scanning electron microscopic techniques. An electrochemical sensor based on ZrO 2 supported nanocrystalline zeolite was developed for the nanomolar detection of organic water pollutants metol and bisphenol A with high electrocatalytic activity, stability, sensitivity, and selectivity. Under the optimum condition, a wide linear range was obtained from 4 nM-800 µM and 6 nM-600 µM with a limit of detection of 1 nM and 3 nM for metol and bisphenol A, respectively. The analytical performance of the developed sensor was demonstrated for the determination of metol and bisphenol A in different real samples such as river water, metol in photographic solution, and bisphenol A in baby bottle with satisfactory results.

Electrochemical Sensor Platforms Based on Nanostructured Metal Oxides, and Zeolite‐Based Materials

“…Zr 4+ at the electrode surface promoted the oxidation of BPA at a specific potential and underwent reduction itself to Zr 3+ . The chemical state of Zr 3+ was rapidly oxidized to regenerate Zr 4+ in the aqueous environment . Hence, Zr ions acted as redox mediator and supported the electrocatalytic oxidation of BPA.…”

“…DPV was recorded for the detection of BPA at modified GCE surface. The DPV results revealed that BPA was oxidized with distinct peak at 548 mV at the modified electrode surface (Figure ) . Zr 4+ at the electrode surface promoted the oxidation of BPA at a specific potential and underwent reduction itself to Zr 3+ .…”

“…Rajendra and co‐workers have developed an electrochemical sensor which has the impressive capability for the determination of BPA (Figure ). ZrO 2 decorated nanocrystalline ZSM‐5 nanocomposites has been developed for this purpose . A direct, one step method was used to prepare nanocrystalline ZrO 2 utilizing F127 tri‐block copolymer, a mixture of phloroglucinol and formaldehyde, and zirconylnitrate under mild acidic condition .…”

“…ZrO 2 decorated nanocrystalline ZSM‐5 nanocomposites has been developed for this purpose . A direct, one step method was used to prepare nanocrystalline ZrO 2 utilizing F127 tri‐block copolymer, a mixture of phloroglucinol and formaldehyde, and zirconylnitrate under mild acidic condition . Synthesis was executed with the help of block copolymer phloroglucinol self‐assembly generating thermally stable nanocrystalline ZrO 2 .…”

“…Hence, Zr ions acted as redox mediator and supported the electrocatalytic oxidation of BPA. ZrO 2 with a weight proportion of 20 % showed the highest electrocatalytic activity which was associated to the highly dispersed ZrO 2 active centers on the external surface of mesoporous ZSM‐5 . Sensor showed an excellent linear relationship range from 6 nM‐600 μM with a detection limit of 3 nM.…”