The Sorption of Ni(II) by Grape Shell Ash from Aqueous Solution: Kinetic and Thermodynamic Studies

Table 2

The maximum amount of Ni(II) sorbate as a function of initial concentration of Ni(II) at 40 minutes.

Initial concentration; of Ni(II) (mg L^−1)	The maximum; uptake efficiency (mg g^−1)
5	4.3447
10	11.2413
20	14.2757
30	17.1723
40	20.5171
50	23.5172