Enhanced CO2 absorption kinetics in lithium silicate platelets synthesized by a sol–gel approach
|dc.identifier.citation||Subha, P. and Nair, B. and Hareesh, P. and Mohamed, A.P. and Yamaguchi, T. and Warrier, K.G.K. and Hareesh, U.S. 2014. Enhanced CO2 absorption kinetics in lithium silicate platelets synthesized by a sol–gel approach. Journal of Materials Chemistry A. 2014 (32): pp. 12792-12798.|
Platelet-shaped lithium orthosilicate particles synthesized by a sol–gel approach employing the precursors lithium nitrate and colloidal silica displayed enhanced absorption kinetics for CO2 compared to the powders prepared by a solid-state reaction process involving Li2CO3 and silica. The sol–gel samples showed a CO2 absorption capacity of 350 mg g-1 at an absorption rate of 22.5 mg g-1 min-1, a value 70% higher than the rate of 13.2 mg g-1 min-1 measured with the solid-state samples under similar conditions. The higher sorption kinetics of CO2 by the sol–gel derived lithium orthosilicate could be attributed to the unique platelet morphology of the particles, which have a very small thickness. A porous carbon mesh coated with the sol–gel based particles exhibited CO2 absorption capacity of 150 mg g-1 at an absorption rate of 37.5 mg g-1 min-1. This supported absorbent also showed stable absorption and desorption performance for the 8 cycles examined in this study. The excellent absorption characteristics of the sol–gel prepared powders, more specifically the coated strips, provide a successful pathway for the commercialisation of these materials.
|dc.publisher||R S C Publications|
|dc.title||Enhanced CO2 absorption kinetics in lithium silicate platelets synthesized by a sol–gel approach|
|dcterms.source.title||Journal of Materials Chemistry A|
|curtin.department||Nanochemistry Research Institute|