Nanoflower, nanoplatelet and nanocapsule Mg(OH)2 powders for adsorption of CO2 gas

• Published in: Journal of materials science 2017-05, Vol.52 (9), p.4910-4922
• Main Authors: Chanda, Dipak Kr, Samanta, Aniruddha, Dey, Arjun, Das, Pradip Sekhar, Mukhopadhyay, Anoop Kumar
• Format: Article
• Language: English
• Subjects: Adsorption; Carbon dioxide; Characterization and Evaluation of Materials; Chemical synthesis; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Magnesium chloride; Magnesium compounds; Magnesium hydroxide; Materials Science; Organic chemistry; Original Paper; Polymer Sciences; Pore size; Porosity; Self-assembly; Solid Mechanics; Surface area; Surface chemistry
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-016-0728-4

The soft chemical synthesis of self-assembled magnesium hydroxide (Mg(OH) 2 ) nanoplatelets with surface area as high as about 300 m 2  g −1 was achieved in the present work. The nanopowders such as MH N , MH Cl , MH Br were synthesized at ~30 °C without using any catalyst or surfactant using, respectively, precursor solutions of Mg(NO 3 ) 2 , MgCl 2 , MgBr 2 and characterized by XRD, BET surface area, BJH pore size analysis, FTIR, FE-SEM, TEM and EDX techniques. It was found that the MH N and MH Cl nanopowders comprised of nanoflowers formed by self-assembly of nanoplatelets and porous nanoplatelets, while the MH Br nanopowders comprised of a random assembly of nanocapsules. The powders possessed the technologically important quality of reproducible CO 2 adsorption at room temperature and its desorption at a relatively lower temperature of 75 °C. Based on the experimental evidences, the mechanisms of various microstructure formations and CO 2 adsorption mechanism were also proposed.