Rapid Preparation of Biosorbents with High Ion Exchange Capacity from Rice Straw and Bagasse for Removal of Heavy Metals

Table 5

Parameters form fits to the pseudo-second-order model.

Ions	Sample	𝑅^2	𝑞𝑒 (mg/g)	𝑘 (g/mg min)	Initial rate (mg/g min)
Cd^2+	RS	0.9618	4.45	7.92𝐸−02	1.57
	RS-oil 3 hr	0.9861	13.35	3.98𝐸−03	0.71
	RS-NaOH 450 W	0.9972	16.18	2.13𝐸−02	5.58
	Baggage	0.9113	1.03	2.56𝐸−01	0.27
	Baggage-NaOH 600 W	0.9673	17.27	3.27𝐸−03	0.98
	Dowax	0.9876	17.83	4.45𝐸−03	1.41
Pb^2+	RS	0.9988	10.50	4.94𝐸−02	5.45
	RS-oil 3 hr	0.9993	15.58	1.74𝐸−02	4.22
	RS-NaOH 450 W	0.9999	17.45	9.33𝐸−02	28.41
	Baggage	0.9528	1.92	4.76𝐸−02	0.17
	Baggage-NaOH 600 W	0.9996	16.98	3.87𝐸−02	11.16
	Dowax	0.992	18.21	6.21𝐸−03	2.06
Cr^3+	RS	0.9957	6.50	3.43𝐸−02	1.45
	RS-oil 3 hr	0.9993	14.33	1.72𝐸−02	3.54
	RS-NaOH 450 W	0.9996	15.70	2.86𝐸−02	7.04
	Baggage	0.979	2.07	1.19𝐸−01	0.51
	Baggage-NaOH 600 W	0.9994	14.08	2.79𝐸−02	5.52
	Dowax	0.9709	20.16	1.89𝐸−03	0.77