Preparation of Na₂Ti₃O₇/Titanium Peroxide Composites and Their Adsorption Property on Cationic Dyes

Table 2

Equations and parameters of kinetic models and kinetic parameters of dyes onto TN-TP.

Kinetic model			Pseudo-first-order kinetic model			Pseudo-second-order kinetic model
Equation			=
Capacity term			, : the amounts of dyes adsorbed (mg/g) at time and at equilibrium, respectively; : the first-order equilibrium rate constant (min^−1); : the second-order equilibrium rate constant (g/(mg·min))
Parameters		(mg/g)	(mg/g)	(min^−1)		(mg/g)	(g/(mg·min))
Concentration of NR (mg/L)	50	48.94	236.98	0.0043	0.84331	49.75	0.000074	0.99976
	100	97.65	202.96	0.0403	0.76211	99.01	0.000019	0.99985
	200	193.90	25.15	0.0428	0.73929	194.55	0.000008	0.99997
	400	377.02	16.33	0.0476	0.96544	390.63	0.000002	0.99989
	600	490.21	13.42	0.0163	0.95304	505.05	0.000002	0.99986
Concentration of MB (mg/L)	50	49.18	30.46	0.0480	0.96565	52.36	0.000107	0.99940
	100	97.07	41.92	0.0359	0.89483	100.40	0.000027	0.99985
	200	188.13	112.49	0.0377	0.97510	198.41	0.000005	0.99994
	400	307.02	177.95	0.0329	0.96500	322.58	0.000002	0.99995
	600	322.81	144.65	0.0173	0.92772	331.13	0.000002	0.99997
Concentration of MG (mg/L)	50	49.41	18.29	0.0493	0.87652	50.25	0.000136	0.99997
	100	98.23	34.60	0.0325	0.89785	100.40	0.000028	0.99997
	200	194.89	87.63	0.0361	0.94685	200.80	0.000006	0.99995
	400	359.98	152.06	0.0285	0.92692	370.37	0.000001	0.99996
	600	386.13	150.42	0.0244	0.93031	393.70	0.000001	0.99997
Concentration of CV (mg/L)	50	47.98	11.65	0.0368	0.83537	48.61	0.000172	0.99997
	100	94.84	12.48	0.0316	0.66735	95.33	0.000044	0.99998
	200	177.56	82.06	0.0306	0.92221	183.82	0.000007	0.99989
	400	279.81	142.73	0.0257	0.93305	290.70	0.000002	0.99992
	600	292.74	164.54	0.0186	0.96956	303.95	0.000002	0.99994