Photobiodegradation of reactive black 5 using mixed microbial culture and N-S-TiO2 under visible light

The photobiodegradation of reactive black five (RB5) by using N-S-TiO2 and mixed cultured under visible light was studied. The effect of several parameters such as dopant concentration, catalyst loading, inoculum size and initial concentration of RB5 were investigated. To study the kinetic of degradation, Langmuir-Hinshelwood mechanism was used for photodegradation meanwhile, for biodegradation, Monod equation was used. Thus, the rate of degradation was measured by using spectrophotometer. Two experiments with the purpose to study the kinetics of photodegradation were conducted by using parameters such as dopant concentration and catalyst loading. Optimum dopant concentration recorded was 0.75 % meanwhile, optimum catalyst loading was 1 g/L. biodegradation experiment shows the optimum inoculum size recorded was 5 mL. Based on combine photodegradation study, the rate of degradation of RB5 was faster compare to photodegradation and biodegradation.