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

Table 2

Experimental conditions for the adsorption of MB on geopolymer.

Investigated parameter	Temperature (°C)	pH	Geopolymer dosage (g)	Contact time (min)	Initial concentration (mg/L)
Geopolymer dosage (g)	25	5	0.05	120	40
			0.1
			0.15
			0.2
			0.25
			0.3
			0.35
Contact time (min)	25	5	0.1	0	20, 30, 40
				30
				60
				90
				120
				150
				180
				220
pH	25	2.21	0.1	120	40
		4.46
		6.16
		8.09
		10.06
		12.06
Temperature (°C)	20	5	0.1	120	40
	50
	70
Initial concentration (mg/L)	25	5	0.1	120	5
					10
					20
					40
					60