Synthesis of high purity hydroxy sodalite nanoparticles via pore-plugging hydrothermal method for inorganic membrane development: Effect of synthesis variables on crystallinity, crystal size and morphology

The effect of synthesis parameters on crystallinity, crystal size and morphology hydroxy sodalite particles developed via the pore-plugging hydrothermal (PPH) method is reported in this study. PPH promising developing nanocomposite membrane materials with superior performance to those prepared from other methods. Towards high-quality sodalite/ceramic for CO2 capture method, obtaining high-purity (SOD) nanoparticles essential. Thus variables (e.g. ageing, interruption time, temperature) purity as-prepared SOD crystals was investigated. A precursor solution molar concentration 5SiO2:0.5Al2O3:50Na2O:1005H2O used synthesis. During synthesis, 45 mL vigorously mixed (with or without ageing) poured into a Teflon-lined stainless-steel autoclave subjected Physico-chemical properties as-synthesized were characterized x-ray diffraction (XRD) crystallinity purity, scanning electron microscope (SEM) coupled energy-dispersive spectrometer (EDS) elemental composition, Fourier transform infrared spectroscopy (FT-IR) surface chemistry. In study, sizes obtained range 227–493 nm percentage as high 75% obtained. When two interruptions one hour each introduced protocol (total time 3.5 h), pure SEM images revealed typical thread ball aggregate similar literature. Ageing prior not instrumental forming crystals, could result low-quality SOD/ceramic membranes method. Furthermore, adjusting temperature do have crystals.