Table 2.

Pseudo-second-order adsorption kinetic parameters.

Adsorbent	R2	qe Experimental (mg/g)	qe Calculated (mg/g)	k2 (g/mg-min)	h (mg/g-min)
CA-SCGs beads (3:3)	0.9999	1.9834	2.0002	0.0378	0.1511
10 ppm Cu2+
CA-SCGs beads (3:3)	0.9999	4.0550	4.0952	0.0199	0.3345
20 ppm Cu2+
CA-SCGs beads (3:3)	0.9998	5.8016	5.8651	0.0112	0.3848
30 ppm Cu2+
CA-SCGs beads (3:3)	0.9993	10.8804	11.1111	0.0032	0.3966
60 ppm Cu2+
CA-SCGs beads (3:3)	0.9988	14.3024	14.6843	0.0018	0.3983
80 ppm Cu2+
CA-SCGs beads (3:3)	0.9987	17.8392	18.3486	0.0015	0.4996
100 ppm Cu2+
CA beads	0.9981	2.0064	2.0687	0.0129	0.0554
10 ppm Cu2+
CA beads	0.9959	3.7600	3.9216	0.0049	0.0759
20 ppm Cu2+
CA beads	0.9851	5.7000	6.0753	0.0021	0.0770
30 ppm Cu2+
CA beads	0.9934	10.6664	11.3122	0.0012	0.1475
60 ppm Cu2+
CA beads	0.9898	13.7208	14.6843	0.0008	0.1756
80 ppm Cu2+
CA beads	0.9795	17.1840	18.7617	0.0005	0.1732
100 ppm Cu2+
CA-SCGs beads (3:10)	0.9999	2.1224	2.1363	0.0482	0.2199
10 ppm Cu2+
CA-SCGs beads (3:10)	0.9999	3.9018	3.9246	0.0206	0.3178
20 ppm Cu2+
CA-SCGs beads (3:10)	0.9998	5.4278	5.4945	0.0101	0.3050
30 ppm Cu2+
CA-SCGs beads (3:10)	0.9994	10.7156	10.8814	0.0031	0.3724
60 ppm Cu2+
CA-SCGs beads (3:10)	0.9990	13.8558	14.1443	0.0019	0.3772
80 ppm Cu2+
CA-SCGs beads (3:10)	0.9984	16.9820	17.2716	0.0013	0.3919
100 ppm Cu2+
SCGs	1.0000	2.1053	2.1075	0.2250	0.9992
10 ppm Cu2+
SCGs	1.0000	3.5742	3.5765	1.0753	13.7552
20 ppm Cu2+
SCGs	1.0000	5.4495	5.4555	0.3621	10.7759
30 ppm Cu2+
SCGs	1.0000	7.3853	7.4019	0.1610	8.8183
60 ppm Cu2+
SCGs	1.0000	7.7725	7.7882	0.1398	8.4818
80 ppm Cu2+
SCGs	0.9995	8.0791	8.0386	0.0228	1.4725
100 ppm Cu2+