Hexavalent Chromium Removal from Model Water and Car Shock Absorber Factory Effluent by Nanofiltration and Reverse Osmosis Membrane

Table 3

Hydration energies, hydrated radii, and diffusion coefficients of some ions [30, 31].

Ion	Na^+	K^+	Cl^−
Hydration energies (kJ mol^−1)	454	363	325	310	1047
Hydrated radii (nm)	0.358	0.331	0.332	0.335	0.379
D (10^9 m^2·s^−1)	1.333	1.957	2.032	1.902	1.065