Síntese de zeólita analcima de elevada pureza e cristalinidade a partir de pó de vidro e lama de anodização de alumínio pela abordagem estatística de Plackett Burman

Abstract

Several industrial activities, including mining, generate an increasing amount of effluents daily that need treatment so that they can be properly disposed of. Adsorption becomes a way to remove contaminants from effluents, and zeolites have the potential for this type of application. Belonging to the tectosilicate family, these minerals can be synthesized in the laboratory, including from industrial waste, which guarantees the optimization of their properties. Two residues that have the necessary characteristics for the synthesis are glass powder (PV) and aluminum anodizing mud (LAA). As they demonstrate difficulties in recycling, their use in synthesis is an alternative to reduce their emissions. In this work, an extensive research was developed, demonstrating the properties of zeolites and their efficiency in the removal of different types of effluents are also highlighted. Gaps that still need to be deepened in the adsorption systems analyzed. The synthesis of analcime zeolite of high purity and crystallinity from PV and LAA was also an object of study in this work. The statistical method of Plackett Burman was used to verify the variables of greater statistical relevance in the process. The results demonstrate that it was possible to obtain pure analcime, with a crystallinity of 75%. Scanning electron microscopy images reveal that crystallization occurred incompletely and that the optimization of the most statistically significant variables can lead to analcime synthesis with even higher crystallinity. Thus, the present study demonstrates that the combination of PV and LAA is an alternative in the synthesis of zeolite with high added value, which can contribute to the reduction of solid waste emission, as well as generate effective and low-cost adsorbents for the wastewater treatment.