Structural studies of natural zeolites and optimizations for water hardness softening media
AbstractThis study was aimed at investigating the mineralogical composition and structural features of natural zeolites using XRF, XRD, TGA, FT-IR and SEM. Natural zeolites were subjected to acid-activation and subsequently with NaCl salt to enhance surface area for water hardness softening applications. Peaks around 3560 and 1650 cm-1 belongs to Oâ€“H stretching and Oâ€“H bending vibrations which confirmed the presence of moisture within zeolite structures. This result was further supported by evolution of moisture above 108Â°C from thermogravimetric analysis. Fibrous structures which are full of rough texture were examined by SEM. The XRD pattern confirmed Stellerite and Barrerite compositions were dominant crystal structures. The mineralogical analysis determined by XRF showed SiO2, Al2O3 and CaO were dominant oxides. The specific surface area of raw and acid-activated zeolites was estimated by the Searsâ€™ method and hence, the experimental values are 10.2 m2Â·g-1 and 35.8 m2Â·g-1, respectively. Batch adsorption parameters such as contact time, pH, adsorbent dose and initial concentrations were studied and optimized. Maximum adsorption capacity (8.04 mgÂ·g-1) was recorded at optimum conditions. The experimental data was fitted-well with Freundlich isotherm model.
How to Cite
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.