Sulfhydryl Functionalized Magnetic Chitosan as an Efficient Adsorbent for High-Performance Removal of Cd(II) from Water: Adsorption Isotherms, Kinetic, and Reusability Studies

Table 2

Isotherm data for Cd(II) adsorption by Fe₃O₄@CS@DMSA nanocomposite (time: 210 min; : 25-300 mg/L; adsorbent dose: 0.01 g; agitation speed: 100 rpm).

Model	Cd(II)
	298 K	308 K	318 K
Langmuir
(mg/g)	314.12	302.73	258.73
(L/mg)	0.0698	0.0278	0.0151
	0.3541	0.5897	0.7254
	0.96915	0.97306	0.97069
Freundlich
	65.213	36.361	18.691
	3.2730	2.6270	2.2381
	0.96072	0.95405	0.96607
Dubinin-R
(mg/g)	261.86	231.17	182.33
(mol^2 KJ^-2)	15.900	115.32	318.78
(kJ mol^-1)	0.1773	0.0658	0.0396
	0.7983	0.82341	0.8159