Synthesis of MnO₂ Hollow Nanospheres through Selective Etching Method as an Effective Absorbent to Remove Methyl Orange from Aqueous Solution

Table 3

Comparison of the adsorption capacities of MO onto various adsorbents.

Adsorbates	Adsorbents	(mg g^-1)	Reference
MO	Amine modified PIM-1 ultrafine fibers	312.50 mg g^−1	[46]
	3-dimensional (3D) flower-like Ni/Al@PAB LDH	412.80 mg g^-1	[47]
	Date palm ash (DPA) and MgAl-LDH composites	242.98 mg g^-1	[48]
	Magnetic lignin-based carbon nanoparticles (MLBCN)	113.00 mg g^-1	[49]
	Chitosan-lysozyme biocomposite (CLC)	435.00 mg g^-1	[50]
	MnO2-graphene-carbon nanotube (MnO2-G-CNT)	476.19 mg g^-1	[51]
	CaFe2O4 and ZrO2 magnetic nanocomposite (CaF-ZO-MNC)	370.37 mg g^-1	[52]
	An amorphous solid contains large cationic aMOC-1	359.00 mg g^-1	[53]
	β-CD and PEI bifunctionalized magnetic (Fe3O4-PEI/β-CD)	192.20 mg g^-1	[54]
	The MnO2 hollow nanospheres (MHNSs)	1677.13 mg g^-1	This work