Biosorption of Lanthanides from Aqueous Solutions Using Pretreated Buccinum tenuissimum Shell Biomass

Table 4

Coefficient of Langmuir and Freundlich isotherms for lanthanides using Buccinum tenuissimum shell biomass after heat treatment (480^∘𝐶, 6 hours).

	Langmuir isotherm				Freundlich isotherm
	𝑎	𝑏	𝑅2	Δ𝐺ads/kJmol^−1	𝑅𝐿	𝐾𝐹	1/𝑛	𝑅2
La	192	0.243	0.982	−13.6	0.0395	57.2	0.258	0.948
Ce	278	0.234	0.972	−13.5	0.0410	70.4	0.292	0.956
Pr	303	0.229	0.962	−13.5	0.0418	71.5	0.321	0.955
Nd	313	0.225	0.956	−13.4	0.0425	72.5	0.328	0.954
Sm	345	0.266	0.948	−13.8	0.0362	78.4	0.359	0.962
Eu	345	0.248	0.947	−13.7	0.0388	76.0	0.364	0.963
Gd	303	0.231	0.955	−13.5	0.0415	75.0	0.299	0.954
Tb	323	0.221	0.961	−13.4	0.0432	69.8	0.354	0.968
Dy	323	0.195	0.957	−13.1	0.0488	66.3	0.358	0.964
Ho	294	0.178	0.961	−12.8	0.0532	61.0	0.346	0.960
Er	294	0.171	0.963	−12.7	0.0553	59.1	0.355	0.964
Tm	303	0.176	0.964	−12.8	0.0539	59.0	0.372	0.968
Yb	323	0.181	0.960	−12.9	0.0523	60.8	0.395	0.974
Lu	333	0.176	0.966	−12.8	0.0536	62.4	0.389	0.975