4. Results and discussion
4.1. The effect on the equilibrium constant
Table 2 shows the equilibrium constants of adsorption of Cu2+ on nano-ZnO and Ag+ on nano-TiO2 at different temperatures, as calculated by equation (25). Figure 2 shows that the logarithm of the equilibrium constant is a function of the reciprocal of the diameter of the nanoparticle.
The average standard molar enthalpy, DaHom (kJ mol1), and the average standard molar entropy, DaSom (kJ mol1 K1) of nanoadsorption at diameter d, pressure p = 91.92 kPa.
a m a m a m a m
25.3 35.0 0.130 0.994 10.6 18.2 0.068 0.988
30.0 32.1 0.120 0.989 18.9 26.4 0.093 0.981
34.3 31.6 0.117 0.992 25.6 29.1 0.100 0.959
40.6 30.1 0.112 0.984 30.6 36.5 0.123 0.981
46.3 28.0 0.104 0.978 36.7 37.5 0.126 0.972 51.3 27.0 0.100 0.959 39.7 38.9 0.130 0.970
It can be observed from table 2 and figure 2 that the equilibrium constant at a constant particle size increases with temperature, indicating that the adsorption is endothermic. This correlates with observations from literature [13,18,19].
The equilibrium constant at a constant temperature also significantly increases with a
4. Results and discussion
4.1. The effect on the equilibrium constant
Table 2 shows the equilibrium constants of adsorption of Cu2+ on nano-ZnO and Ag+ on nano-TiO2 at different temperatures, as calculated by equation (25). Figure 2 shows that the logarithm of the equilibrium constant is a function of the reciprocal of the diameter of the nanoparticle.
The average standard molar enthalpy, DaHom (kJ mol1), and the average standard molar entropy, DaSom (kJ mol1 K1) of nanoadsorption at diameter d, pressure p = 91.92 kPa.
a m a m a m a m
25.3 35.0 0.130 0.994 10.6 18.2 0.068 0.988
30.0 32.1 0.120 0.989 18.9 26.4 0.093 0.981
34.3 31.6 0.117 0.992 25.6 29.1 0.100 0.959
40.6 30.1 0.112 0.984 30.6 36.5 0.123 0.981
46.3 28.0 0.104 0.978 36.7 37.5 0.126 0.972 51.3 27.0 0.100 0.959 39.7 38.9 0.130 0.970
It can be observed from table 2 and figure 2 that the equilibrium constant at a constant particle size increases with temperature, indicating that the adsorption is endothermic. This correlates with observations from literature [13,18,19].
The equilibrium constant at a constant temperature also significantly increases with a
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