Impact of Sm2O3 onthe Morphological, Optical, Magnetic, and Pesticide Adsorption of Co3O4/PANI Hybrid Nanocomposites

Abstract

Adsorption is one of the most favored procedures in advanced wastewater treatment. Magnetic hybrid materials have a great adsorption performance and excellent reusability in the industry. For this reason, the amazing roles of Sm2O3 doping on Co3O4/PANI hybrid nanocomposite materials were studied. Co3O4 nanoparticles were synthesized using the thermal decomposition technique where Sm2O3 doped Co3O4/ PANI hybrid nanocomposite materials were prepared via in situ oxidative polymerization. The X-ray analysis, technique results confirm the successful formation of neat Co3O4 nanoparticles with cubic phase and its presence in emeraldine phase of PANI matrix. X-ray reveals that the crystallinity of hybrid nanocomposite materials increases with increasing Sm2O3 doping ratio. HRTEM showed polycrystalline structure of Co3O4 nanoparticles and that the doped Sm2O3 was well incorporated and dispersed within the PANI matrix. The surfaces topography was studied by FESEM. UV–Vis diffuse reflectance spectrum revealed two characteristic bands of PANI that are shifted towards higher wavelengths with Sm2O3 doping ratio. The calculated indirect energy gaps were found to decrease from 2.83–2.56 eV which indicates a good response of the hybrid nanocomposite materials to the effect of the UV absorption. The magnetic properties of the investigated samples are measured by VSM. Ms was found to decrease with increasing Sm2O3, while Hc increase with Sm2O3 ratio which will hinder the domain walls motion. Adsorptive removal of chlorpyrifos could be ascribed as pseudo-second ordered and Langmuir model. The maximum adsorptive capacity was 36.9, 47.11, 63.8, and 83.03, 96.73 mg/g for PANI, Co3O4/PANI, Co3O4/PANI-2 wt% Sm2O3, Co3O4/PANI/−4 wt% Sm2O3, and Co3O4/PANI-6 wt% Sm2O3hybridnanocomposite materials, respectively.