Somayeh Jafari, Seyed Mehdi Pourmortazavi, Ali Ehsani,
Volume 19, Issue 2 (8-2024)
Abstract
The oxygen generator candle that has a pyrotechnic functional mechanism, is one of the common systems for supplying oxygen in military and civilian planes, submarines, spacecraft and ... Due to the thermal decomposition of chlorates and perchlorates during the combustion of the candle, the byproduct of chlorine gas is released, which is important to accurately measure. In this work, we got help from the high adsorbability and catalytic activity of MOF compound for developing of free chlorine electrochemical sensor which is equivalent to chlorine dissolved in water. For this purpose compound of ZIF-8 was synthesized and incorporated whit CuO nanosheets to modify the glassy carbon electrode (GCE) and supply the new sensor for free chlorine determination. FESEM, EDX, XRD, and FT-IR teqnicues was applied to characterize the fabricated ZIF-8 and CuO-ZIF-8 composites. Cyclic voltammetry and electrochemical impedance spectroscopy have been utilized for the electrochemical characterization of CuO-ZIF-8/GC modified electrode and demonstrated the sensor's ability to measure the chlorine. Using differential pulse voltammetry and under optimal conditions, the built CuO-ZIF-8/GC modified electrode showed a linear response in the range of 0.25 to 60 ppm with a detection limit (LOD) of 12 ppb towards free chlorine concentration
