Photocatalytic sensor for chemical oxygen demand flow system using N-TiO2/Ti electrode: Determination of glucose and potassium hydrogen phthalate

Abstract

The design of the Chemical Oxygen Demand (COD) flow system using TiO2/Ti and N-TiO2 /Ti electrodes has been carried out. TiO2/Ti electrodes were synthesized from the anodizing process followed by the sol-gel method as nitrogen doping (N) to obtain N-TiO2/Ti electrodes. The test results obtained that TiO2/Ti electrodes are only active in UV light and N-TiO2/Ti electrodes can be active in visible light. Determination of the COD value of the flow system for glucose and potassium hydrogen phthalate at various concentrations respectively of 5, 10, 20, and 30 ppm was carried out using the Multi Pulse Amperommetry (MPA) technique. The results of the COD sensor measurement of the flow system on the potassium hydrogen phthalate and glucose obtained light currents increase in proportion to the increase in concentration, which is also significantly proportional to the increase in COD value. The highest COD values for glucose and potassium hydrogen phthalate were at concentrations of 30 ppm respectively of 29.73 and 31.34 mg/L O2 using TiO2/Ti electrodes and for N-TiO2/Ti electrodes respectively 30.91 and 29.20 mg / L O2.