Table 2.

Some thermodynamics parameters for the adsorption of the studied thiosemicarbazides using the weight loss technique.

Systems	Activation Energy, Ea(kJ mol−1)	Heat of adsorption, Qads(kJ mol−1)
1 M H2SO4 (Blank)	28.28	-
4 × 10−4 M AP4PT + 1 M H2SO4	63.13	−30.03
8 × 10−4 M AP4PT + 1 M H2SO4	51.72	−18.64
12 × 10−4 M AP4PT + 1 M H2SO4	55.83	−21.97
16 × 10−4 M AP4PT + 1 M H2SO4	59.15	−24.10
20 × 10−4 M AP4PT + 1 M H2SO4	74.00	−35.24
4 × 10−4 M HP4PT + 1 M H2SO4	73.27	−45.42
8 × 10−4 M HP4PT + 1 M H2SO4	63.11	−30.52
12 × 10−4 M HP4PT + 1 M H2SO4	65.10	−31.46
16 × 10−4 M HP4PT + 1 M H2SO4	48.49	−16.49
20 × 10−4 M HP4PT + 1 M H2SO4	51.91	−18.71
4 × 10−4 M D44PT + 1 M H2SO4	73.89	−45.33
8 × 10−4 M D4PT + 1 M H2SO4	67.91	−36.66
12 × 10−4 M D4PT + 1 M H2SO4	71.53	−38.71
16 × 10−4 M D4PT + 1 M H2SO4	64.83	−31.21
20 × 10−4 M D4PT + 1 M H2SO4	48.11	−16.17