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

Table 1

The parameters of pseudo-first-order and Weber-Morris models of Ni(II) adsorption on micro-HAP and nano-HAP.

Models and parameters	Micro-HAP	Nano-HAP
Pseudo-first-order model
(mg/g)	127.06	460.83
(g/mg·min)
	0.9960	0.9999
Weber-Morris model
(mg/g·min^-1/2)	5.10	2.70
	-1.63	422.91
	0.9759	0.9919
(mg/g·min^-1/2)	0.88	0.07
	70.79	457.49
	0.9810	0.3116