Table 2 Parameters of Webber–Morris intraparticle and Boyd film diffusion models for Cr(VI) adsorption on PSD at different initial concentrations
C0/ mg L−1 | kid/ mg g−1 min1/2 | C1 | R2 | kb/ min−1 | C2 | R2 |
|---|---|---|---|---|---|---|
5 | 3.68 × 10–2 | 0.5 | 0.8958 | 1.68 × 10–2 | 0.13 | 0.9686 |
7.5 | 5.63 × 10–2 | 0.66 | 0.937 | 1.67 × 10–2 | − 0.02 | 0.9977 |
10 | 8.94 × 10–2 | 0.63 | 0.9618 | 1.09 × 10–2 | − 6.46 | 0.9919 |
25 | 0.18 | 0.73 | 0.9819 | 7.03 × 10–3 | − 0.18 | 0.9917 |
50 | 0.24 | 0.96 | 0.9828 | 9.82 × 10–3 | − 0.25 | 0.9972 |