The BOD reflects the biodegradable part of the pollutants, but the COD analysis represents total organic pollution
load of most wastewater discharges [1]. COD is the amount of oxygen equivalents consumed in the oxidation of
organic compounds strong oxidizing agents. Chromate or permanganate is utilized to oxidize the organic
compounds under strong acidic and high temperature reflux conditions to achieve complete oxidation [2]. The
standard method of COD analysis is a time-consuming procedure; unable of be online monitored; requires expensive
(Ag2SO4) and toxic (HgSO4) reagents; and generate hazardous waste which requires disposal [3, 4]. Various
analytical techniques based on either electrocatalytic [5, 6] or photocatalytic [7–10] oxidation principles have been
made to solve these problems [3-11].