https://doi.org/10.1039/C6TA06133H
“Li4SiO4 was synthesised from LiNO3 (Alfa Aesar, UK) and colloidal silica (Aldrich Chemicals, USA) as the starting precursors. Initially 2.39 M LiNO3 solution was prepared by dissolving it in distilled water. Hydrolysis was carried out by the addition of NH4OH to the LiNO3 solution while stirring at room temperature. Colloidal silica was added dropwise under stirring for 1 hour to obtain a sol. The precursor sol was subjected to 700 W microwave radiation at 2.45 GHz for 10 min. A domestic microwave oven (Panasonic-NNGT231M) was used to carry out this experiment. The precursor was then dried at 423 K and heated to 1073 K at a ramp rate of 1 °C min−1 in air atmosphere. The powder calcined at 1073 K for 3 hours was used for CO2 absorption studies unless specified otherwise.”
“Na2CO3 (99.9%), K2CO3 (99.8%) and Li2CO3 (98%), all from Merck, India, were mixed in the weight ratio of 10 : 60 : 30 [eutectic-1], 32 : 37 : 31 [eutectic-2] and 24 : 45 : 31 [eutectic-3] and then blended with the microwave sol–gel samples in the weight ratio 1 : 5. The mixtures were then heat treated at 1073 K before the absorption studies at various temperatures.”