Ultrasound-enhanced milling in the synthesis of phase-pure, highly crystalline ZnAl-layered double hydroxide of low Zn(II) content

作者：Szabados M; Bus Cs; Adok Sipiczki M; Konya Z; Kukovecz A; Sipos P; Palinko I^*

来源：Particuology, 2016, 27: 29-33.

DOI：10.1016/j.partic.2016.01.006

• ZnAl-layered double hydroxide
• Dry milling
• Ultrasonic irradiation

Dry milling followed by ultrasonic irradiation in the presence of small amounts of aqueous NaOH, was used to synthesise ZnAl-layered double hydroxide (LDH). The synthetic conditions were optimised and the Zn(OH)(2), ZnO, and Al(OH)(3) contaminants were removed by rinsing with aqueous NH3 solution from the sample prepared in the optimum conditions. Thus, phase-pure ZnAl-layered double hydroxide was obtained with high crystallinity. All materials produced during the syntheses were characterised by Xray diffractometry, and a rose-like morphology was observed by scanning electron microscopy in the phase-pure sample. By changing the initial Zn/Al ratio, it was revealed that an LDH with low zinc content was always formed, probably through substitution of some of the Zn2+ ions by Al3+ ions in the gibbsite lattice.

• 出版日期2016-8