Highly Recyclable and Versatile La 0.5 Nd 0.2 Ca 0.3 MnO 3 and La 0.5 Nd 0.2 Ca 0.25 K 0.05 MnO 3 Perovskite Catalysts for Effective Removal of Organic Contaminants

Abstract Wastewater contamination, particularly from dye effluents containing organic colorants originating from industrial sources, represents a significant environmental and public health hazard. This study is dedicated to removal of these abundant coloured effluents in wastewater, addressing the imperative need for effective remediation strategies to safeguard ecosystems and human well‐being. In this regard, bare and K‐doped perovskite manganites La 0.5 Nd 0.2 Ca 0.3 MnO 3 (LCM) and La 0.5 Nd 0.2 Ca 0.25 K 0.05 MnO 3 (LCKM) nanoparticles respectively were synthesized in order to study their catalytic behaviour for degradation of coloured effluents. The Rietveld analysis applied to the X‐ray diffraction data provides confirmation of orthorhombic symmetry. For exploring the catalytic properties, rhodamine‐B (RhB) dye was chosen as model dye pollutant. The achieved degradation efficiency is substantial, reaching 99 % within a brief period of 10–12 min. Following these results, we have also carried out the degradation of some other dyes such as methylene blue (MB) and methyl orange (MO). It was observed that MO dye was more efficiently degraded in quick time as compared to all the other dyes due to its anionic nature. Furthermore, the comparative catalytic efficiencies of LCM and LCKM catalysts were explained on the basis of Mn 3+ /Mn 4+ redox pairs and it was observed that LCKM had shown better degradation efficiency than LCM.