Journal of Chemistry / 2022 / Article / Tab 2 / Research Article
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 2 Experimental results of silica yield runs.
Run Coded variable Independent variable Dependent variable A B C D Tem. (°C) NaOH (M) RPM Time (min) Yield of silica (%) Density of silica (g.cm−3 ) 1 0 0 0 − 90 2 450 55 61.62 1.32 2 0 0 0 90 3 450 85 71.22 1.33 3 −1 −1 −1 −1 85 1.5 400 70 59.38 1.41 4 1 1 −1 −1 95 2.5 400 70 68.51 1.22 5 0 0 0 0 90 2 450 85 68.12 1.40 6 −1 −1 1 −1 85 1.5 500 70 68.16 1.33 7 0 0 0 0 90 2 450 85 70.12 1.36 8 0 0 0 100 2 450 85 78.26 1.37 9 0 0 − 0 90 2 350 85 62.94 1.22 10 1 1 1 −1 95 2.5 500 70 66.51 1.28 11 −1 −1 −1 1 85 1.5 400 100 62.71 1.26 12 1 1 −1 1 95 2.5 400 100 69.89 1.29 13 −1 1 1 1 85 2.5 500 100 73.22 1.34 14 −1 −1 1 1 85 1.5 500 100 76.21 1.39 15 0 0 0 0 90 2 450 85 68.51 1.28 16 0 0 0 0 90 2 450 85 68.48 1.24 17 1 −1 1 1 95 1.5 500 100 85.85 1.40 18 1 −1 1 −1 95 1.5 500 70 78.65 1.39 19 0 0 0 0 90 2 450 85 68.49 1.26 20 −1 1 −1 1 85 2.5 400 100 66.67 1.24 21 0 0 0 90 2 450 115 71.32 1.36 22 −1 0 1 −1 85 2.5 500 70 66.11 1.24 23 0 0 0 0 90 2 450 85 68.46 1.26 24 1 1 1 1 95 2.5 500 100 73.18 1.37 25 1 −1 −1 −1 95 1.5 400 70 73.45 1.35 26 0 − 0 0 90 1 450 85 79.78 1.37 27 − 0 0 0 80 2 450 85 64.50 1.24 28 0 0 0 90 2 550 85 74.79 1.36 29 1 −1 −1 1 95 1.5 400 100 75.91 1.37 30 −1 1 −1 −1 85 2.5 400 70 64.11 1.26