Adsorbents         Langmuir constants Freundlich constants
qm(mg/g) b  (L/mg) R2 RL KF 1/n R2
CNT 11.5 0.051 0.99 0.061 3.83 0.2141 0.759
MCNT-HNO3 26.88 0.0085 0.999 0.281  8.5 0.23 0.816
Table 2: N2 adsorption and surface area data of CNT and MCNT-HNO3.