Table 4.

Langmuir and Freundlich isotherm parameters for adsorption of Ag ⁺ ions onto Gd16-AIS QDs, Gd20-AIS QDs, and Gd30-AIS QDs.

% Ag removal	Co (ppm)	Ce (ppm)	Qe (mg/g)	Ce/Qe	Log Ce	Log Qe
Gd16-AIS QDs
99.89	0.89	0.05	12.6	0.003968	−1.301029996	1.100370545
99.89	9.65	0.05	144	0.000347	−1.301029996	2.158362492
99.89	29.55	0.05	442.5	0.000113	−1.301029996	2.645913275
99.89	47.61	0.05	713.4	0.000070	−1.301029996	2.853333105
99.89	68.82	0.05	1031.55	0.000048	−1.301029996	3.013490283
99.89	100.26	0.05	1503.15	0.000033	−1.301029996	3.177002321
Gd20-AIS QDs
99.89	0.89	0.05	12.6	0.003968	−1.301029996	1.100370545
96.99	9.65	0.29	140.4	0.002066	−0.537602002	2.147367108
99.63	29.55	0.055	442.425	0.000124	−1.259637311	2.64583966
99.89	47.61	0.05	713.4	0.000070	−1.301029996	2.853333105
99.89	68.82	0.05	1031.55	0.000048	−1.301029996	3.013490283
99.89	100.26	0.05	1503.15	0.000033	−1.301029996	3.177002321
Gd30-AIS QDs
99.89	0.89	0.05	12.6	0.003968254	−1.301029996	1.100370545
97.92	9.65	0.25	141	0.00177305	−0.602059991	2.149219113
99.89	29.55	0.05	442.5	0.000112994	−1.301029996	2.645913275
99.89	47.61	0.05	713.4	7.00869E-05	−1.301029996	2.853333105
99.03	68.82	0.665	1022.325	0.000650478	−0.177178355	3.009588981
92.58	100.26	7.44	1392.3	0.005343676	0.871572936	3.143732823