Adsorption of Hg(II) from Aqueous Solution Using Adulsa (Justicia adhatoda) Leaves Powder: Kinetic and Equilibrium Studies

Table 2

Kinetic parameters for adsorption of Hg(II) onto ALP biomass at 303 K.

Kinetic model	Linear equation	Reaction constant	𝑞𝑒 (mg/g)	𝑅^2
Pseudofirst order	ln(𝑞𝑒−𝑞𝑡)=ln𝑞𝑒−𝑘1𝑡	𝐾1=0.1209 min^−1	32.1	0.983
Pseudosecond order	𝑡𝑞𝑡=1(𝑘2𝑞^2𝑒)+1𝑞𝑒𝑡	𝐾2=2×10^−3 g/mg min; ℎ=4.34 mg/g·min	46.6	0.998
Elovich	𝑞𝑡=𝛽ln𝛼𝛽+In(𝑡)	𝐵=5.86 g/mg; 𝐴=38 mg/g·min	—	0.9661
Intraparticle diffusion	𝑞𝑡=𝐾id𝑡^1/2	𝐾id=1.70 mg/g·min^0.5; 𝐼=3.1029	—	0.9152