Table 1.

List of models for adsorption isotherms and kinetics for adsorption of metals on chitin-based adsorbents.

Chitin Adsorbent	Metal	Isotherm Model	Kinetic Model	Qm (mg/g)	Reference
Chitin	Fe3+	L, F	-	1.3778	[29]
Chitin of pink shrimp	Pb2+	F	PS2	7.003	[30]
Chemically modified chitin with polypyrrole	Pb2+	F	PS2	8.64	[31]
Chemically modified chitin with polypyrrole	Cd2+	F	PS2	6.17	[31]
Chitin	Cd2+	L	-	90.1	[32]
Chitin/polyethylene glycol binary blend	Cd2+	F	PS2	156 a	[33]
Chitin	Cd2+	L	-	32.4	[34]
Calcareous chitin	Cd2+	L	-	71.4	[34]
Chitin	Cu2+	L	PS2	58	[35]
Chitin from extracted shrimp shells	Zn2+	F	PS2	270.270	[36]
Chitin from extracted from exoskeleton of crab shells	Zn2+	F	PS2	181.18	[37]
Chitin	Zn2+	L	PS2	4.65	[38]
Chitin from shrimp carapaces	Zn2+	L	-	5.86	[39]
Chitin extracted from shrimp shells	As5+	F	PS1, PS2	11.574	[40]
Thiol-modified chitin nanofibers	As3+	L	-	149	[41]
Modified chitin	As3+	L	-	19.724	[42]
Chitin	Cr3+	L	-	7.738	[43]
Chitin-humic acid hybrid	Cr3+	F	FO	9.2	[44]
Bargi scale	Cr6+	L	-	25	[45]
Chitin from Bargi fish (Heterotis Miloticus)	Cr6+	L	-	37.04	[45]
Polypyrrole-functionalized chitin	Cr6+	F	PS2	28.92	[47]

^a Q_m obtained from kinetic adsorption studies; L: Langmuir; F: Freundlich; PS1: Pseudo-first-order kinetic model; PS2: Pseudo-second-order kinetic model; FO: First-order kinetic model.