Table 4.

Fitting parameters of Pb(II), Cd(II), Cu(II) and Zn(II) adsorption isotherms on the adsorbents using Langmuir isotherm model.

Sorbents		Langmuir isotherm model
		b (L g−1)	qm (mg g−1)	Qm (mg gMnO2−1)	R2
BC	Pb(II)	0.02	82.50	—	0.998
	Cd(II)	0.18	26.51	—	0.994
	Cu(II)	0.02	19.14	—	0.985
	Zn(II)	0.02	15.14	—	0.976
BC@MnO2-12.3	Pb(II)	0.12	216.22	1757.89	0.996
	Cd(II)	0.86	66.48	540.49	0.984
	Cu(II)	0.11	48.90	397.56	0.995
	Zn(II)	0.07	31.25	254.07	0.998
BC@MnO2-18.4	Pb(II)	0.19	255.45	1388.32	0.994
	Cd(II)	0.64	100.76	547.61	0.976
	Cu(II)	0.03	72.28	392.83	0.991
	Zn(II)	0.03	44.40	392.83	0.993
BC@MnO2-26.3	Pb(II)	0.27	298.27	1134.11	0.992
	Cd(II)	0.50	127.95	486.50	0.976
	Cu(II)	0.06	91.67	348.56	0.996
	Zn(II)	0.22	56.60	215.21	0.963
BC@MnO2-30.2	Pb(II)	0.49	351.37	1163.48	0.986
	Cd(II)	0.62	151.43	501.42	0.983
	Cu(II)	0.06	103.91	344.07	0.998
	Zn(II)	0.23	68.36	226.36	0.983