. 2020 Apr 10;5(15):8721–8729. doi: 10.1021/acsomega.0c00228

Table 2. Langmuir, Freundlich, and Temkin Isotherm Model Parameters.

model	parameter	MnO₂	ZnO_x-MOF	ZnO_x-MOF@MnO₂ (1)	ZnO_x-MOF@MnO₂ (2)	ZnO_x-MOF@MnO₂ (3)
Langmuir	q_m (mg g^–1)	95.512	101.985	112.820	135.049	147.094
	b (L mg^–1)	0.002	0.006	0.008	0.028	0.048
	r²	0.994	0.961	0.954	0.915	0.937
	χ²	1.380	43.162	53.985	176.608	183.616
Freundlich	K_f [(mg g^–1)(L mg^–1)^1/n]	0.635	1.582	2.007	3.202	3.358
	n	1.382	2.393	5.615	21.760	28.256
	r²	0.996	0.917	0.981	0.982	0.992
	χ²	0.868	92.514	22.836	36.764	22.378
Temkin	K_T (L g^–1)	0.110	0.087	0.812	12.328	14.661
	B (L mg^–1)	9.861	24.483	14.436	21.723	21.844
	r²	0.859	0.945	0.790	0.843	0.877
	χ²	34.129	61.367	246.412	325.058	357.946