Development of Durian Rind/Polypyrrole Composite and Its Application in Removing of Anionic Dyes

Table 2

Parameters of applied isotherm models for dye on DR/PPy material (condition: DR/PPy dosage of 1.5 g L^-1, contacting time of 23 h, and pH of 5).

Dye	Temperature (°C)	Langmuir				Freundlich
		Methyl orange	20	178.25	0.2482	0.9812	0.0133-0.0746	0.3350	51.8679	0.9825
30	191.20		0.2710	0.9919	0.0122-0.0687	0.3916	51.2928	0.9675
40	186.92		0.4035	0.9930	0.0082-0.0472	0.3416	62.3541	0.9654
50	193.05		0.4092	0.9914	0.0081-0.0466	0.3575	63.7736	0.9749
Sunset yellow	20	128.21	0.3216	0.9988	0.0103-0.0585	0.2381	53.6526	0.7913
	30	152.44	0.3225	0.9899	0.0077-0.0584	0.2347	59.4889	0.8012
	40	161.81	0.3985	0.9931	0.0062-0.0478	0.2550	62.5046	0.8237
	50	171.23	0.4595	0.9917	0.0054-0.0417	0.2845	64.5022	0.8046
Amaranth	20	105.37	0.4661	0.9984	0.0071-0.0411	0.1557	52.9713	0.8836
	30	128.53	1.2214	0.9997	0.0027-0.0161	0.1466	72.7348	0.6463
	40	133.69	2.0952	0.9999	0.0016-0.0095	0.1540	78.7942	0.8508
	50	147.71	2.8326	0.9999	0.0012-0.0070	0.1304	97.4666	0.9373