. 2017 Nov 8;2(11):7686–7694. doi: 10.1021/acsomega.7b01556

Table 2. Langmuir Isotherm Parameters for the Adsorption of the Anionic Dyes on pMEA, pMEA-Analogue, and Control Microspheres at 25 °C.

		Langmuir
dye	adsorbent^a	Q_m (mg/g)	N_m/s^b (μmol/m²)	N_m/v^c (μmol/m³)	b (L/mg)	R_L at 0.1 mM
erythrosine	pMEA	164	6.61	20.6	0.031	0.21
	pET2A	119	10.3	15.1	0.028	0.25
	pME2A	129	N.A.^d	31.8	0.014	0.64
	pME3A	127	N.A.^d	31.3	0.004	0.87
	pMSt	35.3	1.12	4.46	0.003	0.96
rose bengal	pMEA	311	10.9	33.9	0.050	0.08
	pET2A	237	17.6	25.8	0.045	0.11
	pME2A	215	N.A.^d	45.8	0.027	0.30
eosin Y	pMEA	131	6.06	21.0	0.025	0.28
	pET2A	47.2	5.01	7.58	0.010	0.69
	pME2A	93.9	N.A.^d	29.5	0.006	0.80
	pME3A	91.7	N.A.^d	28.7	0.003	0.94
	pMSt	23.6	0.95	3.79	0.004	0.88
phloxine B	pMEA	157	6.76	21.1	0.041	0.13
	pET2A	70.6	4.73	9.45	0.008	0.75
	pME2A	101	N.A.^d	26.4	0.005	0.85
tartrazine	pMEA	15.9	1.03	3.30	0.002	0.97
	pET2A	23.8	3.36	3.82	0.001	0.99
	pME2A	61.0	N.A.^d	19.1	0.009	0.72
	pME3A	90.8	N.A.^d	28.5	0.007	0.81
	pMSt	17.8	0.83	2.86	0.001	0.98

[Microsphere] = 0.1 wt %.

N_m/s represents the adsorbed moles of dye per total surface area of the tested microspheres.

N_m/v represents the adsorbed moles of dye per total volume of tested microspheres. The specific volume of the pME2A and pME3A microgels was calculated based on the assumption that the fully swollen microgels contain ∼80% water.

N_m/s could not be determined, as it is difficult to determine the surface area of the microgels.