Production and Optimization of Bio-Based Silica Nanoparticle from Teff Straw (Eragrostis tef) Using RSM-Based Modeling, Characterization Aspects, and Adsorption Efficacy of Methyl Orange Dye

Table 3

ANOVA of fitted model for the yield of biosilica.

Source	Sum of squares	df	Mean square	F-value	value
Model	1026.12	14	73.29	401.21	<0.0001	Significant
A-temperature	286.35	1	286.35	1567.45	<0.0001
B-NaOH	101.02	1	101.02	553.00	<0.0001
C-RPM	209.81	1	209.81	1148.45	<0.0001
D-time	140.94	1	140.94	771.50	<0.0001
AB	97.12	1	97.12	531.63	<0.0001
AC	12.96	1	12.96	70.94	<0.0001
AD	0.6972	1	0.6972	3.82	0.0697
BC	47.54	1	47.54	260.23	<0.0001
BD	0.6889	1	0.6889	3.77	0.0712
CD	23.28	1	23.28	127.44	<0.0001
A^2	12.24	1	12.24	67.02	<0.0001
B^2	79.09	1	79.09	432.95	<0.0001
C^2	0.0425	1	0.0425	0.2328	<0.0001
D^2	8.58	1	8.58	46.98	<0.0001
Residual	2.74	15	0.1827
Lack of fit	0.1779	10	0.0178	0.0347	1.0000	Not significant