The Impact of Sodium Chloride (NaCl) Concentrations on Electrocoagulation in Simultaneous Tartrazine Dye Removal and Hydrogen Production

Liquid waste frequently contains a large variety of hazardous substances, including tartrazine-based dyes. These color compounds can present a significant hazard to both human health and the natural environment. Moreover, there is a growing demand for sustainable energy, and hydrogen is emerging as a promising alternative energy source that does not produce carbon emissions. To address the aforementioned concerns, it is necessary to conduct research that is aimed at eradicating tartrazine while concurrently generating hydrogen gas as a viable substitute for energy. This study aims to investigate the effect of different concentrations of NaCl electrolytes on the rate of tartrazine elimination and hydrogen production simultaneously using electrocoagulation. The electrocoagulation procedure was used, with various concentrations of NaCl (0, 0.2, 0.4, 0.6, 0.8, and 1 g/L). UV-Vis spectrophotometers and gas chromatography were employed to evaluate the elimination of tartrazine and the hydrogen production. The study shows that the elimination of tartrazine at 0, 0.2, 0.4, 0.6, 0.8, and 1 g/L of NaCl for 60 minutes is 30%, 39%, 42%, 69%, 80%, and 86%, and for 240 minutes, it is 66%, 86%, 90%, 92%, 93%, and 94%, respectively. The hydrogen production at 60 minutes is 8.64, 14.37, 45.00, 77.18, 97.04, and 135.16 [mol H₂/m²], and for 240 minutes, it is 63.16, 99.06, 135.45, 177.80, 208.09, and 217.44 [mol H₂/m²], respectively. It can be concluded that higher electrolyte concentrations generally lead to an increase in the proportion of tartrazine elimination and hydrogen production.