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  • Autor
    • Painer, Florian
    • Baldermann, Andre
    • Gallien, Florian
    • Eichinger, Stefanie
    • Steindl, Florian
    • Dohrmann, Reiner
    • Dietzel, Martin
  • TitelSynthesis of Zeolites from Fine-Grained Perlite and Their Application as Sorbents
  • Datei
  • DOI10.3390/ma15134474
  • Erschienen inMaterials
  • Band15
  • Erscheinungsjahr2022
  • Heft13
  • LicenceCC BY 4.0
  • ISSN1996-1944
  • ZugriffsrechteCC-BY
  • Download Statistik36
  • Peer ReviewJa
  • AbstractThe hydrothermal alteration of perlite into zeolites was studied using a two-step approach. Firstly, perlite powder was transformed into Na-P1 (GIS) or hydro(xy)sodalite (SOD) zeolites at 100 °C and 24 h using 2 or 5 M NaOH solutions. Secondly, the Si:Al molar ratio of the reacted Si-rich solution was adjusted to 1 by Na-aluminate addition to produce zeolite A (LTA) at 65 or 95 ° C and 6 or 24 h at an efficiency of 90 ± 9% for Al and 93 ± 6% for Si conversion. The performance of these zeolites for metal ion removal and water softening applications was assessed by sorption experiments using an artificial waste solution containing 4 mmol/L of metal ions ( Me2+: Ca2+, Mg2+, Ba2+ and Zn2+) and local tap water (2.1 mmol/L Ca2+ and 0.6 mmol/L Mg2+) at 25 °C. The removal capacity of the LTA-zeolite ranged from 2.69 to 2.86 mmol/g for Me2+ (=240–275 mg/g), which is similar to commercial zeolite A (2.73 mmol/g) and GIS-zeolite (2.69 mmol/g), and significantly higher compared to the perlite powder (0.56 mmol/g) and SOD-zeolite (0.88 mmol/g). The best-performing LTA-zeolite removed 99.8% Ca2+ and 93.4% Mg2+ from tap water. Our results demonstrate the applicability of the LTA-zeolites from perlite for water treatment and softening applications.