Table 2 Thermodynamic data of Cd-HAP and Ca-HAP in aqueous acidic media (initial pH 2)
HAP | Temp (oC) | ΔG 0 (J/K mol) | ΔH 0 (J/mol) | ΔS 0 (J/K mol) | \(\Delta C_{\text{p}}^{0}\) (J/K mol) |
|---|---|---|---|---|---|
Ca-HAP | 25 | 328,903.30 | −90,597.07 | −1,407.72 | −2,843.41 |
35 | 343,934.66 | −148,419.53 | −1,598.55 | −2,938.83 | |
45 | 360,874.35 | −208,150.32 | −1,789.39 | −3,034.25 | |
Cd-HAP | 25 | 368,710.12 | −158,809.53 | −1,770.20 | −869.52 |
35 | 386,703.91 | −176,491.82 | −1,828.56 | −898.70 | |
45 | 405,281.27 | −194,757.67 | −1,886.91 | −927.88 |