A Novel Biosorbent, Water-Hyacinth, Uptaking Methylene Blue from Aqueous Solution: Kinetics and Equilibrium Studies

Table 2

Adsorption rate constant and coefficient of correlation associated with kinetic models.

Model name	𝐶0 (mg/L)	𝑞𝑒,exp (mg/g)	𝑞𝑒,cal (mg/g)	Identified parameters	𝑅^2	NSD	SSE	EABS
PFO	50	33.00	25.50	𝐾1=0.0405 min^−1	0.8675	7.0160	2.6508	1.1687
	100	48.39	21.55	𝐾1=0.0760 min^−1	0.8996	4.9911	4.0881	1.2191
	150	53.10	8.131	𝐾1=0.03178 min^−1	0.9073	7.9788	7.8205	2.1378
PSO	50	33.00	34.36	𝐾2=0.00166 g·mg^−1 min^−1	0.9963	2.2246	2.6310	1.3700
	100	48.39	49.26	𝐾2=0.00442 g·mg^−1 min^−1	0.9996	3.2251	4.0524	1.2670
	150	53.10	54.00	𝐾2=0.00357 g·mg^−1 min^−1	0.9992	5.2038	4.1585	1.3942
IPD	50	33.00	𝑘𝑊𝑀=0.7140 mg·g^−1 min^−1/2		0.9576	5.5710	7.0520	2.8170
	100	48.39	𝑘𝑊𝑀=0.1506 mg·g^−1 min^−1/2		0.8366	2.7590	2.7340	6.9580
	150	53.10	𝑘𝑊𝑀=0.1040 mg·g^−1 min^−1/2		0.9376	2.390	3.4840	7.1093