SBET	Brunauer–Emmett–Teller surface area (m2 g−1)
Vmic	Micropore volume (cm3 g−1)
Dp	Average pore diameter (nm)
qm	Maximum adsorption capacity of TCH per unit mass of ZBAC (mg g−1)
qt	Amounts of TCH adsorbed at contact time (mg g−1)
qe	Amounts of TCH adsorbed at equilibrium time (mg g−1)
k1	Rate constant for first order kinetic (min−1)
k2	Rate constant for second order kinetic (g mg−1 min−1)
k0	Initial adsorption rate (g mg−1 min−1)
K	Langmuir adsorption constant (L mg−1)
RL	Dimensionless constant separation factor
kf	Freundlich constant which indicates the adsorption capacity
n	Freundlich constant which related to the adsorption strength of the adsorbent
ε	Polanyi potential
K’	Constant of the adsorption energy (mol2 kJ−2)
Ki	Rate constant of the intraparticle diffusion (mg g−1 min−1/2)
E	Adsorption energy (kJ mol−1)
pHpzc	pH at point of zero charge
H	Bed height in fixed bed column adsorption (cm)
Q	Flow rate (mL min−1)
tb	Breakthrough time (min)
Vb	Volume of treated solution (mL)
qb	Adsorption capacity in Fixed bed adsorption (mg g−1)
Rb	Metal removal efficiency of the breakthrough point (%)
ts	Saturation time (min)
Vs	Volume of treated solution (mL)
qs	Adsorption capacity in Fixed bed adsorption (mg g−1)
Rs	Metal removal efficiency of the saturation point (%)
M	Adsorbent dosage (g)
EBCT	Empty bed contact time (min)
MTZ	Mass transfer zone (cm)
Cf	Desorbed concentration of TCH
qe,d	The amount of TCH desorbed
qtotal,d	Amount of TCH desorbed per mass of ZBAC
Cp	The maximum concentration in desorption
CFp	The overall sorption process concentration factor