Enhanced elimination of chromium (VI) ions from wastewater with silica-mixed magnetic nanomaterial: Isotherm and kinetic studies

Abstract

Disposing industrial wastewater and by-products from numerous segments has recently increased its demands in the ecological, methodological, economic, technological, and community spheres where the dispersed water isn’t treated before release. Rice husk is a waste agro field product from rice milling, an abundant source of silica and many other minerals. Rice husk ash is generated by combustion and deep burning out techniques at 600℃. To make 100% pure silica xerogels from RHA, a process involving alkaline separation accompanied by precipitation with acid was performed. Silica-coated Fe3O4 magnetic nanoparticles were produced via microwave practice and used for the complete elimination of Cr(IV) ions from water samples that is lab prepared solutions. The synthesized magnetic nanoparticles were characterized using Scanning electron microscopy (SEM) showing the structure of formed particles, X-ray diffraction (XRD) owns amorphous nature, Energy-dispersive X-ray (EDX) spectroscopy showing peaks of silica 45.36%, Ferrous 49.07%, and oxides in traces. Fourier- transform infrared spectroscopy (FT-IR), Dynamic Light Scattering (DLS), and Zeta Potential. Uniquely the pH value, heat, exposure duration, and dosage all have an impact on the target metal ion has been studied using Atomic Absorption Spectroscopy (AAS) to obtain optimum conditions. Langmuir isotherm seems to be the very greatest fit with the R2 value of 0.9791 and the qm is 102.8 mg/g this study also has great curve fitting in the pseudo-first-order model that supports the top physical adsorption.