Table 2 The variations and magnitudes of adjustments in variables.
From: Theoretical insights in catalytic reduction of Cr(VI) using Pd/Fe nitrogen doped mesoporous carbon
Variables | Ranges and levels | ||||
|---|---|---|---|---|---|
–2(–α) | –1 | 0 | + 1 | + 2(+ α) | |
Reaction time (A) | 1 | 100.75 | 200.5 | 300.25 | 400 |
pH (B) | 0.5 | 1.625 | 2.75 | 3.875 | 5 |
Cr2O72− concentration (C) | 0.0001 | 0.002575 | 0.00505 | 0.007525 | 0.01 |
HCOONa concentration (D) | 0.1 | 0.525 | 0.95 | 1.375 | 1.8 |
