Ni(II) Removal using Date Seeds Powder Biosorbent: Process Parameters Classification and RSM modeling.

The effects of pH, particle size, adsorbent mass and stirring time on the adsorption efficiency were investigated. The Univariate linear regression algorithm was applied on experimental data to rank the most effective parameters on the Ni (II) removal percentage. Response Surface Method (RSM) was then applied to model and optimize the operating conditions of the removal process. Results revealed that the most effective operation parameters on Ni (II) removal is the solution's pH. It has been concluded that the highest removal of 94.13 is obtained with stirring time of 29.15 minutes, particle size 137.81 µm, added mass absorbent of 0.346g and pH of 12.04. Experimental verification showed removal percentage of 93.5 % concluding agreement with that obtained by model prediction.