Use of Coal Ash in Zeolite Production And Applicationsin Manganese Adsorption

摘要

This study aimed at the reuse of coal ashes produced in Brazil to increasesustainability. Results obtained for zeolite synthesis using Brazilian mineral coal ashes at ambient temperature and pressure are reported. The results indicate that the application of ambient temperature at the evaluatedNaOHconcentrations and times resulted in the synthesis of a Na-X (type FAU) zeolite from the ash dissolution. This indicates that zeolite formation is influenced by the process variables. An increase in synthesis time, as well as of NaOH concentrations,in thezeolitic phases resulted in an increase in the ion exchange capacity of the final product. In experiments with 6 M NaOH during 30 days of reaction, the beginning of the formation of the mineralogical phase of zeolite X was observed. XRD results indicated the transformation of the ashes into zeolite X with increased reaction time, whileSEM micrographs elucidated morphological changes. BET results demonstrate that increases in surface area influencdmanganese cation adsorption properties.