Characterizing the Deacidification Adsorption Model of Organic Acids and Phenolic Compounds of Noni Extract Using Weak Base Ion Exchanger

Table 8

Langmuir and Freundlich isotherm constants and correlation coefficients for octanoic acid adsorption by Amberlite IRA 67.

Compound	Langmuir isotherm coefficients				Freundlich isotherm coefficients
	Equation	(mg/g)	(L/mg)	R^2	Equation	(mg/g)	(L/mg)	R^2
Octanoic acid	y = −0.004x + 7.34	250.00	5.45 × 10^−4	0.86	y = 1.213x − 1.286	0.8244	0.28	0.99
Hexanoic acid	y = −0.139x + 26.65	7.19	5.22 × 10^−3	0.78	y = 2.890x − 4.805	0.346	0.0082	0.92
Rutin	y = 0.371x − 0.583	2.70	0.6364	0.81	y = 0.308x − 0.057	3.247	1.059	0.28
Scopoletin	y = −0.556x − 4.207	1.80	0.1322	0.94	y = 0.013x + 0.318	76.92	1.374	0.00
Quercetin	y = −0.451x − 2.849	2.22	0.1583	0.94	y = −0.022x + 0.456	45.45	1.578	0.02