Synthesis of Analcime Zeolite from Glass Powder Waste and Aluminium Anodizing Waste

In this study, the 2-step hydrothermal synthesis of pure phase analcime zeolite from the combination of glass powder waste and aluminium anodizing waste was carried out, to contribute to the reduction of disposal of these industrial residues in sanitary landfills. Population growth has intensified industrial activities worldwide, increasing the generation of waste with a high potential for environmental impact. Currently, the reuse of solid wastes has become an alternative for the development of materials with greater added value. Placket Burman statistical design was used to identify the variables of greater statistical relevance in the synthesis process, aiming at future optimization. Crystallization time and temperature were verified as the most relevant variables in the synthesis, while calcination time and calcination temperature in the alkaline fusion step were the variables with less relevance. The results revealed the formation of single-phase analcime, reaching a crystallinity of up to 75% and a specific surface area of 43.3 m 2 .g −1 . Scanning electron microscopy analysis showed the presence of particles with trapezoidal morphology, typical of analcime zeolite. Zeta potential measurement revealed an isoelectric point in pH 2.6, an important parameter in case of application in wastewater treatment. The investigated experimental conditions also enabled the formation of other zeolites, e.g ., Na-P1, cancrinite, and sodalite, demonstrating that the combination of glass powder waste and aluminium anodizing waste can be used to obtain different zeolitic phases. Consequently, products with greater added value can be obtained, contributing to sustainability in the aluminium and glass industries.