International Journal of Chemical Engineering / 2019 / Article / Tab 2

Research Article

Assessment of the Use of Epicarp and Mesocarp of Green Coconut for Removal of Fluoride Ions in Aqueous Solution

Table 2

Kinetics parameters for adsorption of fluoride ions by epicarp and mesocarp of green coconut.

ModelEpicarpMesocarp

Pseudo-first-order25°C35°C45°C25°C35°C45°C
(mg·g−1)0.16290.17420.18570.23580.22730.2323
(min−1)0.01070.01450.01940.00720.01110.0125
0.99200.98500.95150.99520.98400.9821
−174.2137−164.7537−145.9986−171.3698−153.7335−151.5198
Pseudo-second-order
(mg·g−1)0.20700.20820.21200.32120.23090.2801
(g·mg−1·min−1)0.04900.07580.11200.01870.04080.0512
0.98760.98910.97610.99270.99270.9920
−166.7448−170.2651−158.0703−164.2642−167.0878−165.1528
Elovich model
(mg·g−1·min−1)0.00540.00910.01490.00610.00920.0109
(g·mg−1)23.889524.881925.659317.178218.437718.2533
0.97330.96500.97250.95910.97670.9800
−153.7335−150.3733−155.6375−135.0571−147.3355−149.5615
Intraparticle diffusion model
(mg·g−1·min−0.5)0.00920.00890.00860.01310.01210.0121
(mg·g−1)−0.00430.01770.0379−0.02220.00730.0172
0.93960.93940.94190.97500.96970.9550
−139.8852−140.0723−142.9349−143.4189−142.8754−135.8247

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