Research Article
Preparation and Characterization of Chitosan/Feldspar Biohybrid as an Adsorbent: Optimization of Adsorption Process via Response Surface Modeling
Table 5
Analysis of variance (ANOVA) for response surface quadratic model for adsorption of AB1.
| | Term | Coefficient | Sum of squares | DF | Mean squares | value | value | Remarks |
| | Model | — | 222.56 | 14 | 15.90 | 30.52 | 0.000 | Significant | | −2.25 | 121.82 | 1 | 121.82 | 233.91 | 0.000 | Significant | | −1.09 | 28.31 | 1 | 28.31 | 54.37 | 0.000 | Significant | | 0.15 | 0.50 | 1 | 0.50 | 0.97 | 0.340 | | | 0.61 | 8.97 | 1 | 8.97 | 17.22 | 0.001 | Significant | | 1.35 | 51.75 | 1 | 51.75 | 99.36 | 0.000 | Significant | | 0.12 | 0.44 | 1 | 0.44 | 0.84 | 0.372 | | | −0.06 | 0.10 | 1 | 0.10 | 0.19 | 0.667 | | | 0.04 | 0.038 | 1 | 0.04 | 0.073 | 0.790 | | | | 0.10 | 0.16 | 1 | 0.16 | 0.31 | 0.583 | | | | 0.16 | 0.41 | 1 | 0.41 | 0.80 | 0.386 | | | | −0.58 | 5.41 | 1 | 5.41 | 10.38 | 0.005 | Significant | | | 0.35 | 1.96 | 1 | 1.96 | 3.77 | 0.070 | | | | −0.28 | 1.27 | 1 | 1.27 | 2.43 | 0.139 | | | | 0.19 | 0.58 | 1 | 0.58 | 1.12 | 0.305 | | | Residual | | 8.33 | 16 | 0.52 | — | — | | | Lack of fit | | 7.73 | 10 | 0.77 | 7.66 | 0.011 | Significant | | Pure error | | 0.61 | 6 | 0.10 | | | | | Correl. total | | 230.90 | 30 | | | | | | Intercept | 3.11 | | 1 | | | 0.000 | Significant |
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