Ultrasonic‐Assisted Preparation Of Perovskite‐Type Lanthanum Nickelate Nanostructures and Its Photocatalytic Properties

Abstract In the present investigation, the perovskite‐type Lanthanum Nickelate (LaNiO 3 , LNO) nanostructure samples with the incompatible surface morphology were successfully synthesized by a single step ultrasonication processes followed by annealing at various temperatures in the range of 500–800 °C. The phase identification and chemical composition of the perovskite‐type LaNiO 3 nanostructure was inspected by powder X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS). Besides, the physical and chemical techniques such as Fourier transform infrared spectroscopy (FT‐IR), UV‐Vis diffuse reflectance (UV‐vis DRS) studies, and microscopic studies (SEM and TEM) revealed the nature of the LNO samples. Moreover, as a result of calcination and phase transformation, a significant comparative bandgap around 1.78‐2.12 eV observed, which was fascinating to examine their visible photons induced photocatalytic degradation of Orange‐G azo dye (OG). The impact of various experimental circumstances inclusive of initial dye concentration, catalyst amount, pH of the reaction medium, and the effect of different oxidants was optimized. Under the optimum context, the photodegradation efficiency of the OG dye with LNO‐800 was 96 % whereas LNO‐800 with oxidant peoxodisulphate (PDS) shows 98 % activity within the 240 min and 150 min, respectively. After each photocatalytic experiment, photocatalyst samples can be effortlessly separated from the reaction mixture and shows almost equivalent photocatalytic effectiveness after multiple cycles intimated the superior photostability of LNO samples.