Optimization study of the adsorption of malachite green removal by MgO nano-composite, nano-bentonite and fungal immobilization on active carbon using response surface methodology and kinetic study

Environmental Sciences Europe

Table 4 Analysis of variance (ANOVA), results for decolourization of MG by (a) nano-bentonite, (b) MgO impregnated clay

Source	Sum of squares	df		Mean square		F-value	p-value
(a)
Model	154.80	14		11.06		71.82	< 0.0001	Significant
A-pH	96.72	1		96.72		628.26	< 0.0001
B-Concentration	6.27	1		6.27		40.72	< 0.0001
C-Temperature	0.0573	1		0.0573		0.3720	0.5517
D-Dose	0.0327	1		0.0327		0.2121	0.6522
AB	1.94	1		1.94		12.58	0.0032
AC	1.82	1		1.82		11.81	0.0040
AD	0.4122	1		0.4122		2.68	0.1241
BC	5.16	1		5.16		33.53	< 0.0001
BD	2.90	1		2.90		18.84	0.0007
CD	0.7868	1		0.7868		5.11	0.0402
A²	36.62	1		36.62		237.90	< 0.0001
B²	0.4943	1		0.4943		3.21	0.0948
C²	0.3021	1		0.3021		1.96	0.1830
D²	0.0429	1		0.0429		0.2786	0.6059
Residual	2.16	14		0.1539
Lack of fit	1.83	10		0.1831		2.26	0.2246	Not significant
Pure error	0.3243	4		0.0811
Cor total	156.96	28
SD	0.3924
Mean	96.16
CV %	0.4080
R²	0.9863
Adjusted R²	0.9725
Predicted R²	0.9296
Adeq precision	29.5754
(b)
Model	164.92		14	11.78	36.85		< 0.0001	Significant
A-A	14.16		1	14.16	44.29		< 0.0001
B-B	10.89		1	10.89	34.06		< 0.0001
C–C	0.0101		1	0.0101	0.0315		0.8616
D-D	8.28		1	8.28	25.90		0.0002
AB	3.72		1	3.72	11.63		0.0042
AC	5.31		1	5.31	16.61		0.0011
AD	15.61		1	15.61	48.84		< 0.0001
BC	4.25		1	4.25	13.28		0.0027
BD	1.12		1	1.12	3.49		0.0827
CD	0.9298		1	0.9298	2.91		0.1102
A²	92.98		1	92.98	290.86		< 0.0001
B²	0.1184		1	0.1184	0.3705		0.5525
C²	0.1724		1	0.1724	0.5392		0.4749
D²	0.2293		1	0.2293	0.7174		0.4112
Residual	4.48		14	0.3197
Lack of fit	1.91		10	0.1914	0.2988		0.9448	Not significant
Pure error	2.56		4	0.6404
Cor total	169.40		28
SD	0.5654
Mean	95.85
CV %	0.5899
R²	0.9736
Adjusted R²	0.9472
Predicted R²	0.9113
Adeq precision	22.8424