Zeolite Application in Wastewater Treatment

Table 9

Most used models to describe the adsorption isotherm and kinetics of zeolites in wastewater treatment systems.

Adsorption isotherm models	Model equation	Variables	References
Langmuir	(1)	: equilibrium concentration (mg/L); : equilibrium adsorption capacity (mg/g); : Langmuir constant (L/mg); : maximum adsorption capacity (mg/g); : empirical parameter for adsorption intensity; : Freundlich constant (mg/g)(mg/L)^(-1/^); : theoretical maximum adsorption capacity (mg/g); : sips parameters; : Koble-Corrigan parameters; : constant related to adsorption energy; : Polanyi adsorption potential; : equilibrium constants; : exponential constant value (0-1); : equilibrium Temkin constants; : gas constant (J/mol·K); : temperature (K); : amount of adsorbed species at equilibrium at any time (mg/g); : pseudo-first-order constant (h^-1); : pseudo-second-order constant (g/mg·h); : intraparticle diffusion constant (mg/g·h^0.5); : time (h)	[81]
Freundlich	(2)		[82]
Sips	(3)		[169]
Koble-Corrigan	(4)		[90]
Dubinin-Radushkevich	(5)		[109]
Redlich-Peterson	(6)		[112]
Temkin	(7)		[170]
Adsorption kinetic models	Model equation
Pseudo-first-order	(8)		[171]
Pseudo-second-order	(9)		[171]
Intraparticle diffusion	(10)		[113, 150]