Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-Grafted Macadamia Nutshell Powder

Table 3

Freundlich and Langmuir adsorption constants for MHP.

Models	Parameters	20 MHP	35 MHP	50 MHP
	(mg/g)	14.60	22.24	37.74
Langmuir	(mg/g)	21.77	27.76	60.59
	(L/mg)	0.0173	0.0391	0.0189
		0.873	0.935	0.961
	Var	2.72	2.81	6.67
	(mg^1−1nL^1/n/g)	1.33	3.27	3.39
Freundlich		1.96	2.33	1.84
		0.906	0.947	0.974
	Var	2.02	2.29	4.39

Sum of square errors divided by degrees of freedom.