Research Article

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Table 2

The Langmuir parameters of Ni(II) sorption/desorption and sorption-desorption hysteresis (HC%) on micro-HAP and nano-HAP.

Adsorption/desorption systemLangmuir modelHC%
(mg/g) (mL/g)

Micro-HAP, 298 K60.6
 Adsorption7.23815.460.9480
 Desorption12.25695.900.9728
Micro-HAP, 318 K75.7
 Adsorption
 Desorption24.88259.340.9736
Nano-HAP, 298 K-71.6
 Adsorption23.36180.050.9883
 Desorption17.94182.660.9755
Nano-HAP, 318 K-2.0
 Adsorption
 Desorption24.90118.940.9718