Advance oxidation processes of Rhodamine B under O3/UV using spent bleaching earth-ZnO composite: Performance in kinetics

Andriyan Yulikasari (Dept. of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia)
Ervin Nurhayati (Research Center for Infrastructure and Sustainable Environmental, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia)
Fransiscus Xaverius Fernando Cornelio (Dept. of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia)
Diah Susanti (Dept. of Material and Metallurgical Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia)

Journal of Environment and Sustainability
Vol. 7 No. 1 (2023): pp 1-90 (April 2023)

Spent bleaching earth and ZnO composite (SBE/ZnO) was prepared as the catalyst for the advanced oxidation processes (AOPs) of rhodamine B (RB) under O3/UV.  The photocatalytic ozonation process of RB was conducted at an ozone flow rate of 1 L/min by adjusting the variation of initial RB concentration, catalyst dosage, and reaction time.  The RB removal efficiency of 96.7% was reached within 36 min at optimal operational conditions (initial concentration of 100 mg/L and catalyst dosage of 1.5 g). The kinetical analysis at this condition showed that the photocatalytic ozonation process of RB followed a pseudo-first-order reaction with a rate constant of 0.0975 min-1. Meanwhile, the effect of operational variables was evaluated using response surface methodology (RSM) and resulted in an optimized model for RB Removal following equation:  RB Removal = 84.95 - 6.24A + 5.81B + 22.45C + 3.07AB + 13.14AC - 6.72BC + 0.1174A2 + 7.86B2 - 8.90C2, where A is the initial concentration of RB, B is catalyst dose and C is reaction time, with a high coefficient of determination R2 = 0.9432.