Kinetic and Thermodynamic Studies on the Phosphate Adsorption Removal by Dolomite Mineral

Table 2

Estimated kinetic model parameters for phosphate adsorption by dolomite.

Intraparticle diffusion model:
Initial phosphate concentration/(mg/L)		/(mg/(g·min^1/2))		SD
10	0.8990	0.0104	0.9401	0.00661
30	2.5134	0.0490	0.9518	0.02769
50	4.0065	0.0966	0.9222	0.07055
70	3.4407	0.3089	0.9682	0.14076
90	−1.3036	0.8581	0.9630	0.4227
Pseudo-first-order model:
Initial phosphate concentration/(mg/L)	/(min^−1)	/(mg/g)		SD
10	1.5421	1.0110	0.9821	0.0039
30	2.5160	3.0426	0.9805	0.0022
50	3.1923	5.0669	0.9989	0.0004
70	9.5929	6.9324	0.9826	0.0035
90	57.4628	10.4811	0.9631	0.0201
Elovich model:
Initial phosphate concentration/(mg/L)	α/(mg/(g·min))	/(g/mg)		SD
10	3.7975	0.2751	0.9766	0.41284
30	6.1505	0.1757	0.9866	0.48756
50	7.5168	0.1471	0.9731	0.82918
70	30.7053	0.0655	0.9886	1.20612
90	20.0906	0.0314	0.9182	0.95821
Pseudo-second-order model:
Initial phosphate concentration/(mg/L)	/(g/(mg·min))	/(mg/g)		SD
10	0.5637	1.0148	1.0000	0.2412
30	0.1168	3.0586	0.9999	0.0901
50	0.0602	5.0743	1.0000	0.0185
70	0.0129	7.0877	0.9985	0.1978
90	0.0008	13.6519	0.9903	1.1780