Table 5.

Effect of temperature on parameters ¹ of methylene blue elution.

ID	T (°C)	Weight of n Sheets (g)	δ (mm)	α	m2″ (min−1)	S (M)	Dbulk (m2 s−1)	Deff (m2 s−1)	τ	Leff/L
h	10	0.155	1.130	0.170	0.00604	0.048	4.4 × 10−10	5.0 × 10−12	15	3.9
i	20	0.155	1.132	0.171	0.0127	0.082	4.6 × 10−10	7.6 × 10−12	10	3.2
j	30	0.155	1.133	0.172	0.0316	0.13	4.7 × 10−10	1.3 × 10−11	6.3	2.5
k	40	0.155	1.128	0.168	0.0404	0.21	4.9 × 10−10	1.2 × 10−11	7.0	2.6
l	50	0.155	1.129	0.169	0.0298	0.33	5.0 × 10−10	5.1 × 10−12	17	4.1
m	60	0.155	1.131	0.170	0.0489	0.94	5.2 × 10−10	6.6 × 10−12	13	3.6

¹δ, sample thickness; α, porosity; m_2″, true elution rate constant; S, solubility; D_bulk, diffusion coefficient in bulk water; D_eff, effective diffusion coefficient; τ, tortuosity factor; L, thickness of diffusion layer; L_eff, actual diffusion distance.