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

Table 1

Parameters of pseudo-first- and pseudo-second-order adsorption kinetic models and the intraparticle diffusion model at various concentrations.

(mg L^-1)			Pseudo-first-order model
			50	475.95		0.04402		43.793		0.9869
100	942.99		0.04788		136.904		0.9683
150	1420.08		0.0598		560.220		0.9962
(mg L^-1)	Pseudo-second-order model				Intraparticle diffusion model
	50	2.7822	478.469	0.9999	636.943	8.339	421.176	0.9562
100	0.9187	952.381	0.9999	833.333	42.114	705.854	0.8299
150	0.2349	1458.99	0.9997	500.000	78.136	881.039	0.9830