Adsorption-Oxidation Mechanism of δ-MnO₂ to Remove Methylene Blue

Table 1

The physicochemical properties of δ-MnO₂.

Sample	(m^2/g)^a	(m^2/g)^b	(m^2/g)^c	(cm^3/g)^d	AOSMn^e	Composition	pHZPC^f
δ-MnO2	89.8	13.9	75.9	0.042	3.86	K0.21MnO2.03(H2O)0.71	1.78

^aBET surface area; ^bmicropore surface area; ^cexternal surface area; ^dmicropore volume obtained from -plots; ^emanganese average oxidation state; ^fzero point charge.