Chiang Mai Journal of Science

Perovskite oxides have ultra applications for advanced oxidation in wastewater. Environmental protection treatment process relies on the durability, and performance of catalysts to drive the development of cutting-edge sustainable technologies for the elimination of refractory contaminants. Reference of LCT_0.4/SCO3 produce singlet oxygen is rare. Herein, prepared LCT_0.4/SCO3 were successfully prepared through glucose by Sol-gel method, and further utilized as super catalysts to degrade Rhodamine B (RhB) by coupling with peroxymonosulfate (PMS) in environmental protection. Preparation of lanthanum cobalt titanium oxide and No. 3 strontium cobalt oxide catalysts (Sol gel No. 3), abbreviated as LCT_0.4/SCO3. XRD, SEM, XPS, UV-Vis and ESR to characterize the catalyst, to study the effect of SCO3 and LCT_0.4 composite on the performance. The results showed that the composite catalyst had no significant effect on the activity of the catalyst. Three parameters (LCT_0.4/ SCO3 dosage of 0.038 g L^-1, PMS concentration of 0.571 g L^-1, and original pH) were obtained via test method in environmental protection. Benefiting from the larger specific surface area, pore-volume, and existence of abundant hydroxyl groups, LCT_0.4/SCO3 prepared through glucose by Sol-gel method with more available active sites exhibited a super efficiency of 89.2 % toward catalytic degradation of RhB under the optimal conditions. The degradation rate was 4.1 times higher than that without PMS. Moreover, LCT_0.4/SCO3 demonstrated durability and stability. The scavenging experiments and electron paramagnetic resonance technologies revealed that non-radical singlet oxygen (¹O₂) was associated as active species in the LCT0.4/SCO3/PMS system. Besides, the reaction mechanism on the LCT_0.4/SCO3 degradation pathways toward RhB was speculated under PMS activation. The results indicated that the effects between structures not only significantly boosted the removal efficiency and long term stability of LCT_0.4/SCO3. But also facilitated the redox cycles, which produce ¹O₂. This proof-of-concept approach to develop such high-efficient structures produced will open up novel avenues for wastewater decontamination via PMS activation.