Adsorption of Chromium (VI) by Cu (I)-MOF in Water: Optimization, Kinetics, and Thermodynamics

Table 1

Kinetic models of adsorption of Cr (VI) onto Cu (I)-MOF in aqueous solution.

Models	Parameters		R^2adj
Pseudo-first-order	k1 (min^−1)	qe (mg⋅g^−1)
	0.0547	53.95	0.9230
Pseudo-second-order	k2 (g⋅mg^−1⋅min)	qe (mg⋅g^−1)
	0.00129	58.72	0.8504
Elovich	α (mg⋅g^−1⋅min)	β (mg⋅g^−1)
	0.1218	24.38	0.5971
Intraparticle diffusion	kp (mg⋅g^−1⋅min)	C (mg⋅g^−1)
	1.1812	28.97	0.2276

R²_adj is the adjusted determination coefficient; k₁ is the first-order rate constant; q_e is the equilibrium adsorption capacity; k₂ is the second-order rate constant; α is the initial rate constant; β is the desorption coefficient; k_p is the rate constant; C is a constant related to the thickness of the boundary layer.