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Table 4

Measured parameters in Freundlich and Langmuir adsorption isotherms

Heavy metalsNanomaterial typesAdsorption isotherms
LangmuirFreundlich
Cu Activated CNPs y = 0.0013x – 0.0002 y = −0.1202x +2.962 
qm = 769.23077(mg/g) Kf = 916.2205 ((mg/g) (L/mg−1))1/n 
Kl = 6.5 (L/mg) 1/nf = 8.31947 
Rl = 0.0121 N = 0.1202 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.001x – 0.0000002 y = −0.0044x + 2.9926 
qm = 1,000 (mg/g) Kf = 983.1052 ((mg/g) (L/mg−1))1/n 
Kl = 5,000 (L/mg) 1/nf = 227.2727 
Rl = 0.00001592 N = 0.0044 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0012x – 0.00003 y = −0.0387x – 2.9509 
qm = 833.333 (mg/g) Kf = 869.561 ((mg/g) (L/mg−1))1/n 
Kl = 40 (L/mg) 1/nf = 25.8398 
Rl = 0.001986 N = 0.0387 
R2 = 0.9983 R2 = 0.884 
Pb Activated CNPs y = 0.0011x – 0.000009 y = 0.001x – 0.000001 
qm = 1,000 (mg/g) Kf = 964.9393 ((mg/g) (L/mg−1))1/n 
Kl = 1,000 (L/mg) 1/nf = 96.1538 
Rl = 0.00008944 N = 0.0104 
R2 = 1 R2 = 1 
Non-activated CNPs y = −0.0104x +2.9845 y = −0.029x +2.9721 
qm = 909.0909 (mg/g) Kf = 937.778 ((mg/g) (L/mg−1))1/n 
Kl = 122.22 (L/mg) 1/nf = 34.4828 
Rl = 0.000731 N = 0.029 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.001x – 0.000006 y = −0.0153x +2.9794 
qm = 1,000 (mg/g) Kf = 953.6741 ((mg/g) (L/mg−1))1/n 
Kl = 250 (L/mg) 1/nf = 65.3595 
Rl = 0.000358 N = 0.0153 
R2 = 0.9998 R2 = 0.8781 
Fe Activated CNPs y = 0.0011x – 0.000005 y = −0.0252x +2.9704 
qm = 909.091 (mg/g) Kf = 934.114 ((mg/g) (L/mg−1))1/n 
Kl = 220 (L/mg) 1/nf = 39.6825 
Rl = 0.00052 N = 0.0252 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.0013x – 0.0002 y = −0.1405 + 2.9474 
qm = 769.2308 (mg/g) Kf = 885.9312 ((mg/g) (L/mg−1))1/n 
Kl = 6.5 (L/mg) 1/nf = 7.1174 
Rl = 0.01726 N = 0.1405 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0012x – 0.00003 y = −0.0544x +2.9473 
qm = 833.333 (mg/g) Kf = 885.7272 ((mg/g) (L/mg−1))1/n 
Kl = 40 (L/mg) 1/nf = 18.3824 
Rl = 0.002846 N = 0.0544 
R2 = 0.9995 R2 = 0.9267 
Zn Activated CNPs y = 0.0024x – 0,0013 y = −0.551x +2.904 
qm = 416.667 (mg/g) Kf = 801.678 ((mg/g) (L/mg−1))1/n 
Kl = 1.846 (L/mg) 1/nf = 1.81488 
Rl = 0.11472 N = 0.551 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.0022x – 0.001 y = −0.4973x +2.894 
qm = 454.5454 (mg/g) Kf = 783.971 ((mg/g) (L/mg−1))1/n 
Kl = 2.2 (L/mg) 1/nf = 2.010859 
Rl = 0.098078 N = 0.4973 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0022x – 0.001 y = −0.4944x +2.8941 
qm = 454.545 (mg/g) Kf = 783.6101 ((mg/g) (L/mg−1))1/n 
Kl = 2.2 (L/mg) 1/nf = 2.02265 
Rl = 0.09808 N = 0.4944 
R2 = 0.9999 R2 = 0.9997 
Heavy metalsNanomaterial typesAdsorption isotherms
LangmuirFreundlich
Cu Activated CNPs y = 0.0013x – 0.0002 y = −0.1202x +2.962 
qm = 769.23077(mg/g) Kf = 916.2205 ((mg/g) (L/mg−1))1/n 
Kl = 6.5 (L/mg) 1/nf = 8.31947 
Rl = 0.0121 N = 0.1202 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.001x – 0.0000002 y = −0.0044x + 2.9926 
qm = 1,000 (mg/g) Kf = 983.1052 ((mg/g) (L/mg−1))1/n 
Kl = 5,000 (L/mg) 1/nf = 227.2727 
Rl = 0.00001592 N = 0.0044 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0012x – 0.00003 y = −0.0387x – 2.9509 
qm = 833.333 (mg/g) Kf = 869.561 ((mg/g) (L/mg−1))1/n 
Kl = 40 (L/mg) 1/nf = 25.8398 
Rl = 0.001986 N = 0.0387 
R2 = 0.9983 R2 = 0.884 
Pb Activated CNPs y = 0.0011x – 0.000009 y = 0.001x – 0.000001 
qm = 1,000 (mg/g) Kf = 964.9393 ((mg/g) (L/mg−1))1/n 
Kl = 1,000 (L/mg) 1/nf = 96.1538 
Rl = 0.00008944 N = 0.0104 
R2 = 1 R2 = 1 
Non-activated CNPs y = −0.0104x +2.9845 y = −0.029x +2.9721 
qm = 909.0909 (mg/g) Kf = 937.778 ((mg/g) (L/mg−1))1/n 
Kl = 122.22 (L/mg) 1/nf = 34.4828 
Rl = 0.000731 N = 0.029 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.001x – 0.000006 y = −0.0153x +2.9794 
qm = 1,000 (mg/g) Kf = 953.6741 ((mg/g) (L/mg−1))1/n 
Kl = 250 (L/mg) 1/nf = 65.3595 
Rl = 0.000358 N = 0.0153 
R2 = 0.9998 R2 = 0.8781 
Fe Activated CNPs y = 0.0011x – 0.000005 y = −0.0252x +2.9704 
qm = 909.091 (mg/g) Kf = 934.114 ((mg/g) (L/mg−1))1/n 
Kl = 220 (L/mg) 1/nf = 39.6825 
Rl = 0.00052 N = 0.0252 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.0013x – 0.0002 y = −0.1405 + 2.9474 
qm = 769.2308 (mg/g) Kf = 885.9312 ((mg/g) (L/mg−1))1/n 
Kl = 6.5 (L/mg) 1/nf = 7.1174 
Rl = 0.01726 N = 0.1405 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0012x – 0.00003 y = −0.0544x +2.9473 
qm = 833.333 (mg/g) Kf = 885.7272 ((mg/g) (L/mg−1))1/n 
Kl = 40 (L/mg) 1/nf = 18.3824 
Rl = 0.002846 N = 0.0544 
R2 = 0.9995 R2 = 0.9267 
Zn Activated CNPs y = 0.0024x – 0,0013 y = −0.551x +2.904 
qm = 416.667 (mg/g) Kf = 801.678 ((mg/g) (L/mg−1))1/n 
Kl = 1.846 (L/mg) 1/nf = 1.81488 
Rl = 0.11472 N = 0.551 
R2 = 1 R2 = 1 
Non-activated CNPs y = 0.0022x – 0.001 y = −0.4973x +2.894 
qm = 454.5454 (mg/g) Kf = 783.971 ((mg/g) (L/mg−1))1/n 
Kl = 2.2 (L/mg) 1/nf = 2.010859 
Rl = 0.098078 N = 0.4973 
R2 = 1 R2 = 1 
Activated CNPs/Non-activated CNPs y = 0.0022x – 0.001 y = −0.4944x +2.8941 
qm = 454.545 (mg/g) Kf = 783.6101 ((mg/g) (L/mg−1))1/n 
Kl = 2.2 (L/mg) 1/nf = 2.02265 
Rl = 0.09808 N = 0.4944 
R2 = 0.9999 R2 = 0.9997 
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