Sonication accelerated formation of Mg-Al-phosphate layered double hydroxide via sol-gel prepared mixed metal oxides


Single-phase magnesium-aluminium layered double hydroxide (LDH) intercalated with dihydrogen phosphate was successfully produced by hydration of nanopowder of the respective mixed metal oxide (MMO) obtained using sol-gel based method followed by a two-step anion exchange hydroxide-to-chloride and chloride-to-phosphate. The MMO with the metal cation ratio of Mg/Al = 2:1 was prepared using the aqueous sol-gel method. Processes of the parent Mg2Al-OH LDH formation and the successive anion-exchanges, OH- -> Cl- and Cl- -> H2PO4-, were considerably accelerated via the application of high-power (1.5 kW) ultrasound. The crystalline phases formed at all stages of the Mg2Al-H2PO4 LDH production were characterized using X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy, inductive coupled plasma optical emission spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Based on the data of chemical analysis and the XRD data, the type of the intercalated phosphate anion was determined and the arrangement of this anion in the interlayer was modelled.




Science & Technology - Other Topics


Sokol, D; Vieira, DEL; Zarkov, A; Ferreira, MGS; Beganskiene, A; Rubanik, VV; Shinn, AD; Kareiva, A; Salak, AN

nossos autores


The work has been done in frame of the project TUMOCS. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 645660. The financial support of P2020 COMPETE and FCT-Portugal through project POCI-01-0145FEDER-016686 - PTDC/CTM-NAN/2418/2014 (NANOCONCOR) is acknowledged as well. The research done in University of Aveiro was also supported by the project CICECO - Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. D.E.L. Vieira acknowledges the financial support of this work through AdvaMtech PhD programme scholarship PD/BD/143033/2018.

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