In this study the D-R isotherm model also have higher correlation (r2) of 0.9241 compared with Langmuir and Freundlich isotherm models which have low correlations.
The adsorption capacity qmax in the D-R equation was found to be 6.95 mg P/g for phosphate.
It exhibited higher adsorption capacity than Fe(III)/Cr(III) hydroxide [24], acid-thermal treated red mud [6] and steel slag did [8].