Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Table 3

Quantitative chemical composition of metakaolin and geopolymer.

Oxides (wt.%)	Metakaolin	Geopolymer	Elements (wt.%)	Metakaolin	Geopolymer
SiO2	37.6	31	O	46.7	45.6
Al2O3	19.6	13.4	Na	11	20.4
Na2O	14.9	27.5	Si	17.6	14.5
MgO	8.46	5.94	Al	10.4	7.08
CaO	2.35	1.66	Fe	1.92	1.29
Fe2O3	2.75	1.85	K	1.32	0.936
K2O	1.5	1.13	Ca	1.68	1.19
SO3	4.14	3.4	S	1.66	1.36
Loss on ignition	7.74	13.5	Mg	5.4	3.58
SiO3/Al2O3	1.92	2.31	Si/Al	1.7	2.04