Table 1.

Pseudo second-order (k) kinetic rate constants for conventional and ultrasonic biosorption of MB onto FBP. Sorption conditions for section A: 5 g/L adsorbent dose, pH 5.8 and different initial concentrations, section B: 50 mg/L initial concentration, pH 5.8 and different adsorbent doses. Correlation factors are also included in the table.

	C0 mg/L	k (CV) (g/mg.min)	R2	k (US) (g/mg.min)	R2	% increase in k
Section A	3.6	0.97 ± 0.09	0.997	4.00 ± 0.32	0.992	312
	7.0	0.48 ± 0.04	0.979	1.86 ± 0.19	0.997	288
	13	0.15 ± 0.01	0.996	0.52 ± 0.04	0.998	254
	25	0.10 ± 0.01	0.985	0.35 ± 0.03	0.998	246
	50	0.018 ± 0.001	0.996	0.051 ± 0.005	0.995	183
	75	0.017 ± 0.001	0.999	0.030 ± 0.002	0.999	79
	101	0.012 ± 0.006	0.999	0.016 ± 0.001	0.998	34
Section B	Adsorbent Dose (g/L)	k (CV) (g/mg.min)	R2	k (US) (g/mg.min)	R2	% increase in k
	1.0	0.0015 ± 0.0001	0.997	0.0015 ± 0.0002	0.996	0
	2.5	0.0040 ± 0.0004	0.997	0.0040 ± 0.0003	0.995	0
	5.0	0.018 ± 0.001	0.987	0.051 ± 0.004	0.975	183
	7.5	0.097 ± 0.007	0.998	0.315 ± 0.020	0.999	225
	10	0.102 ± 0.005	0.999	0.398 ± 0.039	0.984	290
Section C	pH	k (CV) (g/mg.min)	R2	k (US) (g/mg.min)	R2	% increase in k
	2.8	0.013 ± 0.001	0.996	0.017 ± 0.002	0.995	31
	3.8	0.026 ± 0.004	0.999	0.037 ± 0.004	0.994	42
	5.1	0.034 ± 0006	0.999	0.061 ± 0.006	0.992	79
	5.8	0.018 ± 0.005	0.996	0.051 ± 0.005	0.995	183
	7.2	0.066 ± 0.006	0.999	0.091 ± 0.006	0.994	38
	7.9	0.065 ± 0.006	0.998	0.087 ± 0.006	0.994	34
	9.2	0.068 ± 0.008	0.999	0.086 ± 0.008	0.998	26