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

Table 4

Effects of Cu(II) on Cr(III) and Cr(VI) adsorption onto kaolin under different pH values.

	pH
	2.0	3.0	4.0	5.0	6.0	7.0
Cr(III)
	1.59	2.06	1.80	1.74	1.53	1.31
PE (%)	58.7	106	80.0	73.5	52.9	30.6
Cr(VI)
	0.91	0.35	0.07	0.15	0.18	0.51
IE (%)	9.14	64.8	93.0	84.7	82.4	49.5