Table 2 Adsorption kinetics parameters for As(V) and As(III) adsorption on iron hydroxide nanopetalines at pH 4.0 and 8.0.
From: Arsenic removal performance and mechanism from water on iron hydroxide nanopetalines
Models | As(V) | As(III) | ||
|---|---|---|---|---|
pH 4.0 | pH 8.0 | pH 4.0 | pH 8.0 | |
Pseudo-first-order model | ||||
k1 (h−1) | 20.43 | 7.36 | 4.71 | 6.10 |
qe (mg/g) | 135.51 | 114.91 | 61.25 | 95.67 |
R2 | 0.769 | 0.842 | 0.876 | 0.843 |
ARE (%) | 15.65 | 3.78 | 3.63 | 3.35 |
Pseudo-second-order model | ||||
k2 (g/(mg h)) | 0.0259 | 0.0136 | 0.0058 | 0.0126 |
qe (mg/g) | 146.41 | 116.69 | 70.32 | 108.81 |
R2 | 0.984 | 0.961 | 0.973 | 0.961 |
ARE (%) | 1.65 | 1.13 | 1.87 | 1.31 |
Elovich model | ||||
α (mg/g/h) | 6.14 × 109 | 7.18 × 1041 | 1.74 × 104 | 6.01 × 104 |
β (g/mg/h) | 0.167 | 0.855 | 0.166 | 0.114 |
R2 | 0.965 | 0.607 | 0.958 | 0.957 |
ARE (%) | 0.201 | 1.02 | 0.938 | 1.73 |
