Research Article

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Table 2

Intraparticle diffusion model for Cr(III) and Cr(VI) adsorption in single and binary solution.

Adsorbed solutionFilm diffusionPore diffusionIntraparticle diffusion

Cr(III)0.1760.1460.9970.0650.1360.9930.7780.0110.952
Cr(III)-Cu0.3070.1220.9960.5770.0610.9740.8440.0170.958
Cr(VI)0.2100.1680.9880.3150.0040.966
Cr(VI)-Cu0.0270.0230.9710.3150.0040.966

The unite of is mg·g−1; the unite of is mg·g−1·min−0.5.