Adsorptive Removal and Degradation of p-Arsanilic Acid Using Magnetite Nanoparticles and Fenton Reagent: A Sustainable Approach
摘要
P-arsanilic acid (p-ASA), an organoarsenic compound widely used as a veterinary feed additive in poultry and swine industries, is an emerging pollutant and one of the potential sources of arsenic in the environment. This study opens up a novel and sustainable approach for the adsorption, desorption, and Fenton reagent-based subsequent degradation of p-arsanilic acid, using green magnetite nanoparticles (Fe₃O₄ NPs) as an adsorbent. An aqueous extract prepared from the leaves of milkweed (Calotropis procera) plant was used to produce magnetic Fe3O4 NPs. The properties of nanoparticles were further studied using advanced characterization tools, including Zeta Potential Analysis, Fourier-Transform Infrared Spectroscopy, Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy and X-ray diffraction. Adsorption of p-ASA from aqueous solutions on the surface of Fe3O4 NPs was studied and optimized. Being magnetic, the Fe₃O₄ NPs could be easily separated from the aqueous solution after the adsorption and mixed with distilled water for desorbing p-ASA into the wash solution, which was further degraded using Fenton’s reagent. Furthermore, the Fe3O4 NPs, after desorption, retained their adsorption efficiency, enabling them to be recycled multiple times for p-ASA’s adsorption and desorption. The green Fe3O4 NPs exhibited an adsorption efficiency of 76%, even during the eighth cycle of adsorption. Thus, the study presents a sustainable and recyclable nanoparticle-based system for eliminating p-ASA for effective treatment and purification of water.