A facile preparation method for efficiency a novel LaNiO3/SrCeO3 (p-n type) heterojunction catalyst in photocatalytic activities, bactericidal assessment and dopamine detection

The wide occurrence of medicines and textiles pollutants in water bodies, as well as their by-products, has raised concerns about the impact of damage to the environment and human health. In this study, the photocatalytic effect of Lanthanum nickelate (LaNiO3), strontium cerate (SrCeO3), and LaNiO3/SrCeO3 nanocomposite were studied using the co-precipitation method at room temperature. Various techniques were used to analyze the structural, morphological, optical properties of these synthesized nanoparticles. The results indicates uniform growth of LaNiO3 nanoparticles on the surface of SrCeO3 nanoparticles in sphere-shaped forms which confirms the formation of a p-n type junction catalyst. The energy bandgap of SrCeO3, LaNiO3 and LaNiO3/SrCeO3 was found to be 2.79, 2.06, and 1.65 eV, respectively. The photocatalytic activity was studied by degradation of Methylene Blue dye under visible light. As a result, reusability test shows the stability of catalysts for long-term period. The LaNiO3/SrCeO3 composites depicts the effective degradation for MB dye was 93.5% at 100 min. The rate constant (K, min-1) of SrCeO3, LaNiO3, and LaNiO3/SrCeO3 was 0.0050, 0.0088, and 0.0156, respectively. The antibacterial action of LaNiO3/SrCeO3 versus Klebsiella pneumoniae and Bacillus cereus observed by using the antimicrobial test. The peroxidase activity of LaNiO3/SrCeO3 was performed for colorimetric detection of dopamine. The linear range of the method is 1-200 nM via the detection limit of 3.48 mu M. The LaNiO3/SrCeO3 has high potential in analysis of dopamine.