Studies on Synthesis Characterization Properties and Applications of Zeolites as Molecular Sieves

Abstract

This extensive research delves into the multifaceted development and applications of zeolite materials obtained from agricultural waste rice husk ash (RHA), demonstrating their versatility across a range of fields. The study intricately investigates the synthesis and characterization of various zeolites, namely RHA-NaX, Cu-NaX, and RHA-SAPO-11, with a specific focus on their potential applications in water treatment and catalysis. newlineThe synthesis of NaX zeolite from RHA is comprehensively explored, and its structural stability is rigorously assessed through an array of advanced characterization techniques, including Infrared Spectroscopy (IR), X-ray Diffraction (XRD), UV-Visible Spectroscopy (UV-Vis), Thermogravimetric Analysis (TGA), Differential Thermal Analysis (DTA), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDX). Cation exchange experiments involving Zn, Cu, and Fe ions showcase the successful substitution of Na+ ions. ZnNaX and ZnFeNaX are identified as thermally stable options, while the hygroscopic nature of ZnCuNaX is elucidated through TGA and DTA analyses. Distinct absorption bands for each zeolite variant are revealed through UV studies. newlineNaX zeolite, synthesized from silicaextracted from RH, undergoes cation exchange with Cu to form Cu-NaX. This derivative is employed as a photocatalyst for the degradation of brilliant green dye. The degradation process is systematically studied, considering critical parameters such as contact time, pH, dye concentration, and Cu-NaX dosage. Dielectric properties, including dielectric constant, AC conductivity, relaxation time, and dissipation factor, are meticulously investigated, showcasing the remarkable effectiveness of Cu-NaX in absorbing brilliant green dye from aqueous solutions. newlineFurthermore, the synthesis of SAPO-11 from RHA is detailed, utilizing the conventional static hydrothermal method with varying temperatures, time duration and ultrasonication. Di-n-propylamine is employed as a directing template, and the impact of tempe