Graphite Coupled with TiO2 Paste Photoelectrodes Well Oriented over COD Photoelectrocatalysis for Rapid Detection of Methylene Blue Organic Dye

As an effort to observe the impact of pollution on the aquatic environment, water quality monitoring calls for the development of early detection technologies that are fast, efficient, and inexpensive. Currently, electrochemical sensors are an alternative technology to sensitively analyze pollutants in the aquatic environment. Engineering working electrodes to sense polluting compounds is the target of technology development. This work studies material compositions consisting of graphite carbon with TiO2 nanoparticles as a photoelectrode to analyze chemical oxygen demand (COD) in methylene blue (MB) organic dye wastewater. The materials were prepared by physically mixing the two components and one-pot chemical synthesis, characterizing their microstructure and crystallinity. Then, their analytical performance was assessed by measuring MB dye as a sample against the mass variation of 1:1 (w/w) and 1:2 (w/w) photoelectrodes. The results showed similar 1:1 (w/w) performance with the relevant and theoretical COD. The straightforward synthesis and eco-friendly materials are key factors in the fabrication of COD sensor.