Title : Dynamics of pH variation in biomimetic sensor TPhPFe/Al2O3//Si
Abstract:
During the investigation of the biomimetic sensor, the dynamics of pH changes were studied under different reaction conditions involving sensor materials. Measurements were performed using high-precision pH meters, allowing real-time monitoring of the solution's acidity changes.
When the biomimetic sensor interacted with the studied reagents (hydrogen peroxide or its intermediates), a gradual change in pH was observed, correlating with the intensity of the reaction. In the case of using a biomimetic sensor based on TPhPFe³⁺/Al₂O₃//Si, a decrease in pH was noted in the presence of oxidizers, which is associated with the formation of acidic products during the reaction. The decomposition of H₂O₂ was monitored using pH measurements (pH tester ATCPro HS) and chromatographic analysis (LHM-80 chromatograph).
Over the experimental period, pH shifted towards a neutral environment at certain stages of the reaction, indicating the preservation of the sensor's functional activity. pH changes were also dependent on the concentration of active substances in the solution: with increasing hydrogen peroxide (H₂O₂) concentration, pH changes became more pronounced, confirming the high sensitivity of the sensor to varying chemical conditions.
The dynamics of pH changes during the interaction of the biomimetic sensor with chemical substances not only provide insights into the sensor's activity but also offer valuable information about the reaction mechanism and stability. Upon complete decomposition of H₂O₂, the pH of the medium returned to the value of the background solution.
