LDH	Layer double hydroxide
Co	The initial concentration
Ct	The dye concentration (mg/L)
V	The volume of the dye solution (L)
W	The mass of the sorbent (g)
qe	Equilibrium adsorption capacity of adsorbent (mg/g)
Ce	Equilibrium concentration of the adsorbate (mg/L)
Q%	Removal percent
$\chi$ 2	Chi square
qexp	Experimental adsorption capacity of adsorbent at equilibrium (mg/g)
qcal	Calculated adsorption capacity of adsorbent at equilibrium (mg/g)
$R^2$	Determination coefficient
${\overline{R}}^2$	Adjusted correlation coefficient
Kf	Freundlich constant (L/g)
n	The sample size
k	The number of independent variables in the regression equation
1/nf	Freundlich adsorption intensity
K LF	Equilibrium constant for heterogeneous solid
k1	Rate constant of pseudo first-order model (1/min)
k2	Rate constant of pseudo second-order model (g/mg min)
kip	Measure of diffusion coefficient (mg g−1 min−1(1/2))
Cip	Intraparticle diffusion constant mg/g