The equilibrium temperature of CO 2 absorption and regeneration showed an increasing trend with increasing CO 2 concentration, and the weight increase was used to evaluate the CO 2 absorption performance of Li 4 SiO 4 material, which can be calculated according to Equation (11): (11) I N = W N − 100 % where I N is the weight increase of Li 4 SiO 4 material during the N th cycle, wt.%; W N is the weight gain, wt.%; N is the number of cycles.
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