Research Article
Removal of Zinc from Aqueous Solution by Optimized Oil Palm Empty Fruit Bunches Biochar as Low Cost Adsorbent
Table 4
Analysis of variance (ANOVA) for response surface quadratic model for adsorption capacity of OPEFB biochar.
| | Source of data | Sum of squares | Degree of freedom (DF) | Mean square | -value | value
Prob > | Comment |
| | Model | 84.47 | 9 | 9.39 | 52.95 | <0.0001 | Significant | | | 33.42 | 1 | 33.42 | 188.57 | <0.0001 | | | | 5.87 | 1 | 5.87 | 33.14 | 0.0002 | | | 11.01 | 1 | 11.01 | 62.09 | <0.0001 | | | 0.09 | 1 | 0.09 | 0.5 | 0.4967 | | | 0.63 | 1 | 0.63 | 3.54 | 0.0894 | | | 0.01 | 1 | 0.01 | 0.06 | 0.8189 | | | 18.2 | 1 | 18.2 | 102.69 | <0.0001 | | | 4.55 | 1 | 4.55 | 25.65 | 0.0005 | | | 16.42 | 1 | 16.42 | 92.62 | <0.0001 | | Residual | 1.77 | 10 | 0.18 | | | | Lack of fit | 1.46 | 5 | 0.29 | 4.65 | 0.0585 | Not significant | | Pure error | 0.31 | 5 | 0.06 | | | |
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