Increasing textile industries in Indonesia resulted in increasing the utilization of dyes. The use of synthetic dyes are still dominating because they have many advantages. But, synthetic dyes are difficult to decompose in nature so they can cause potential pollution if discharged directly into the environment. In this study, Procion Red was used as a model of synthetic dye wastewater. The objective of this research is to study the effect of TiO2 catalyst concentration and irradiation time on the degradation of Procion Red under solar irradiation. Photo degradation takes place by using TiO2 catalyst powder in the various concentration of Procion Red of 150-300 ppm. The various concentrations of TiO2 catalyst of 0.5-8 g/l were used. The color and COD degradation of Procion Red for 12 hours of solar irradiation were investigated. Color degradation was measured by using a spectrophotometer. While COD degradation was measured by using Ferrous Ammonium Sulfate (FAS) analysis method. The result showed when using Procion Red of 150 ppm, the highest color degradation of 100% was achieved by using TiO2 catalyst of 6 g/l and the highest COD degradation of 62% was obtained by using TiO2 catalyst of 8 g/l, under 12 hours of solar irradiation

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