Electrochemical synthesis of ZnO branched submicrorods on carbon fibers and their feasibility for environmental applications

Table 1 Comparison of some host-supported NMOs for heavy metal removal

NMOs	Host substrate	Pb(II)	Zn(II)	Cd(II)	Hg(II)	Reference
NMOs	Host substrate	Pb(II)	(mg g⁻¹)	(mg g⁻¹)	(mg g⁻¹)	Reference
MnO₂	Crushed brick	0.030 mg g⁻¹	-	-	-	[27]
MnO₂	Sand	0.029 mg g⁻¹	-	-	-	[27]
MnO₂	Zeolite	0.35 mmol g⁻¹	-	-	-	[28]
-	Diatomite	99.0 mg g⁻¹	-	-	-	[29]
ZnO	Activated carbon	100%	-	-	-	[30]
CaTiO₂	Al₂O₃	124 mg g⁻¹	13.86	8.58	-	[31]
Fe₂O₃	-	218.53 mg g⁻¹	-	212	344.8	[32]
Goethite	Sand	0.702 mg g⁻¹	-	-	-	[33]
-	Sand	1.21 mg g⁻¹	-	-	-	[34]
Fe₂O₃	Municipal sewage sludge	42.4 mg g⁻¹	-	-	-	[35]
Fe₃O₄	-	-	-	-	227	[36]
ZnO	-	-	357	384	714	[16]
Fe₂O₃	-	176.33 mg g⁻¹	16.97	-	303.0	[37]
ZnO	Carbon fiber	245.07 mg g⁻¹	-	-	-	This work