Mixed Maghemite/Hematite Iron Oxide Nanoparticles Synthesis for Lead and Arsenic Removal from Aqueous Solution

Table 1

Comparison of heavy metal adsorption capacities of various iron oxide materials.

Heavy metal	Iron oxide	Qe (mg/g)	References
Pb	Fe2O3	36	[3]
	Magnetite	9.8	[23]
	Iron oxide tea-waste	18.83	[24]
	Iron oxide–silica	16.4	[25]
	IO-Na	16.64	This study
As	Flower-like iron oxide	5.5	[26]
	Hydrous iron oxide	8	[27]
	Magnetite–maghemite	3.6	[28]
	Magnetite	0.99	[29]
	IO-Na	14.33	This study