High efficiency on resin photocatalysis: Study on application and kinetic mechanism using langmuir Hinshelwood Model

• Resin Immobilize Photocatalyst on reducing tofu waste water under the UV light, the resin is doped with two different semiconductor metals, ZnO and TiO 2 . • In this study, RIPT was made with variations in catalyst weight to determine the effect of catalyst ratio. • A Langmuir-Hinshelwood kinetic model was used in the photocatalysis kinetic study to determine the reaction rate. • In RIPT-ZnO, the weight of the catalyst affects the reduction of BOD, the highest BOD reduction was obtained from RIPT with 30gr ZnO with a performance that can reduce BOD of tofu waste by 90.2 %. • while in removing COD parameter RIPT-ZnO weighing 30gr can reduce 92.61 %. This study aims to evaluate the effectiveness of Resin Immobilize Photocatalyst on reducing tofu waste water under the UV light, the resin is doped with two different semiconductor metals, ZnO and TiO 2 . Resin Immobilization Photocatalyst Process (RIPT) was synthesized by impregnating resin and catalyst. In this study, RIPT was made with variations in catalyst weight to determine the effect of catalyst ratio. The primary focus of this study is the reduction of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) in tofu wastewater. A Langmuir-Hinshelwood kinetic model was used in the photocatalysis kinetic study to determine the reaction rate, in this study the resin capacity of each sample was also calculated. In RIPT-ZnO, the weight of the catalyst affects the reduction of BOD, the highest BOD reduction was obtained from RIPT with 30 g ZnO with a performance that can reduce BOD of tofu waste by 90.2 %, while in removing COD parameter RIPT-ZnO weighing 30 g can reduce 92.61 %. In RIPT-TiO 2 also shows the same trend, the more catalyst used, the greater the removal, whether in BOD or COD, sequentially the reduction in BOD and COD is 79.96 % and 85.29 %. The results of this study indicate that the use of RIPT with different catalyst ratios can effectively reduce BOD and COD in tofu wastewater, with ZnO showing superior performance compared to TiO 2 .