Statistical optimization of textile dye effluent adsorption by <i>Gracilaria edulis</i> using Plackett-Burman design and response surface methodology.

Thus, the linear, quadratic, and interactive terms were found to be highly significant for the textile dye decolorization. 3.4 Surface and contour plots- interaction between the significant factors The two-dimensional contour and three-dimensional surface plot were used to investigate the effect of the individual variables and their interaction for the predicted responses on the decolorization of dye effluent.

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