ABSTRACT
Coal and bio-coal are used as fuel in various industries, which leads to the production of fly ash that is rich in silica and alumina. The high silica content in fly ash, whether amorphous or crystalline, positions it as an environmentally sustainable alternative to traditional silica sources. In construction, fly ash serves as a partial replacement for cement in concrete formulations, imparting enhanced strength and durability. Its rich silica content plays a pivotal role in improving the overall performance of concrete structures. Its utility extends to ceramics, glass production, and agricultural soil improvement, harnessing the beneficial effects of silica on plant health. Furthermore, the exquisite amount of silica in fly ash can serve as a raw material for a large number of pure and mixed zeolite syntheses. The synthesis involves alkali activation and hydrothermal treatment, while a more pure form of zeolites can be synthesized by extracting silica from fly ash. The porous structure of these zeolites and their ion exchange properties make them effective adsorbents and catalysts, contributing to environmental remediation efforts and industrial processes. The synthesis of silica-rich zeolites from fly ash not only mitigates waste management concerns but also transforms a byproduct into a valuable resource, showcasing the potential for sustainable and innovative practices in the realms of materials science.
