In order to clarify the adsorption kinetics of Cu(II) and Cr(VI) on
the cotton gauze with chitosan weight gain of about 10, 20 and 30%,
the experimental data were fitted to the Lagergren’s pseudo-first-
order and Ho’s pseudo-second-order models respectively.
The linear pseudo-first-order equation according to Lagergren
model can be written in the following form:
log(qe − qt) = log qe − K1
where qe (mg/g) is the amount of metal ion adsorbed at the equi-
librium time and K1 is the rate constant of the equation (min−1).
2.303t (3)