Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Luiz D Silva Neto; Chayene G Anchieta; José L S Duarte; Lucas Meili; José T Freire

doi:10.1021/acsomega.1c03581

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

ACS Omega. 2021 Aug 10;6(33):21819-21829. doi: 10.1021/acsomega.1c03581. eCollection 2021 Aug 24.

Authors

Luiz D Silva Neto¹, Chayene G Anchieta², José L S Duarte³, Lucas Meili³, José T Freire¹

Affiliations

¹ Drying Center of Pastes, Suspensions, and Seeds, Department of Chemical Engineering, Federal University of São Carlos (UFSCar), São Carlos, São Paulo 13565-905, Brazil.
² Advanced Energy Storage Division, Laboratory of Advanced Batteries (LAB), Center for Innovation on New Energies, School of Chemical Engineering, University of Campinas (Unicamp), Campinas, São Paulo 13083-852, Brazil.
³ Laboratory of Processes, Center of Technology, Federal University of Alagoas (UFAL), Maceió, Alagoas 57072-900, Brazil.

Abstract

This study aimed to evaluate the synthesis of MgAl/LDH from the drying process perspective, evaluating the influence of temperature (75-90 °C) and time (16-20 h) in the drying process. The synthesis was performed, maintaining a ratio of 2:1 of Mg/Al, and the drying was conducted according to a 2² experimental design: four axial points and three repetitions at the central point. The surface area and pore diameter ranged from 4.09 to 18.55 m²/g and 12.50 to 24.46 nm. Fourier transform infrared (FTIR) analysis indicated the drying-caused variation of the LDH typical bands intensities. Scanning electron microscopy (SEM) images showed the tendency of the increase of agglomeration with the temperature elevation. The drying parameters' influence was evident for X-ray diffraction (XRD) analysis observing the crystallite size increment, from 13.10 to 38.94 nm, and basal spacing variation, from 7.52 to 7.64 Å. The statistical models for growing crystal and reduction of the basal spacing were physically consistent but with low values of R ². The drying time and temperature had a considerable influence on the chemical, physical, structural, and morphological properties of LDH.