CNT MCNT-HNO3 T (K) 303.15 318.15 333.15 303.15 318.15 333.15 ΔG0(KJ/mol) -21.81 -23.35 -24.91 -23.44 -24.72 -25.94 ΔH0(KJ/mol) 9.456 1.816 ΔS0(J/mol/k) 103.14 83.34

Table 5: Thermodynamic parameters for the adsorption of Pb(II) on CNT and MCNT-HNO3.