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. 2019 Nov 1;9(61):35588–35598. doi: 10.1039/c9ra03981c

Thermodynamic parameters of fluoride adsorption for HAP and HAP-MMT.

Temp (K) HAP-MMT HAP
ΔG° (kJ mol−1) ΔS° (kJ mol−1 K−1) ΔH° (kJ mol−1) ΔG° (kJ mol−1) ΔS° (kJ mol−1 K−1) ΔH° (kJ mol−1)
300 −0.92 0.16 47.42 0.85 0.20 61.85
308 −2.02 0.18
313 −3.31 −1.31
323 −3.94 −2.58
333 −4.72 −3.04