Halloysite@polydopamine/ZIF-8 Nanocomposites for Efficient Removal of Heavy Metal Ions

Table 4

Thermodynamic parameters for removal of heavy metal ions.

Heavy metals	T (K)	△H (kJ/mol)	△S [J/(K·mol)]	△G (kJ/mol)
Cu^2+	298	−36.31	−104.64	−5.12
	303			−4.60
	308			−4.08
	313			−3.55
Ni^2+	303	−58.70	−186.03	−3.27
	308			−2.34
	313			−1.41
	318			−0.48
Pb^2+	303	−73.34	−190.10	−16.72
	308			−15.77
	313			−14.81
	318			−13.86
Cd^2+	303	−8.31	−16.76	−3.32
	308			−3.23
	313			−3.15
	318			−3.07