CaAl-layered double hydroxides (CaAl-LDHs) were synthesised with various interlayer anions (CO3 2-, F-, Cl-, Br- and I-) by mechanochemical pre-treatment followed by ultrasonic irradiation in aqueous media. The parameters of the syntheses (duration of pre-milling and sonication, quality of the aqueous media, temperature) were altered in order to optimise the procedure and to understand the formation of LDH and other secondary products. The products were characterised by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The optimisation resulted in close-to-phase-pure CaAl-LDHs, not only with carbonate and chloride interlayer anions, but the hard-to-intercalate bromide and iodide as well.
- Mechanochemical pre-treatment
- Ultrasonic irradiation
- Varied interlayer anions
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Acoustics and Ultrasonics
- Radiology Nuclear Medicine and imaging