Research Article
Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol
Table 5
The coefficients of the Langmuir, Freundlich, and Redlich-Peterson isotherms for MB system.
| (a) |
| | CNTs | Langmuir isotherm | | (mmol/kg) | KL (L/mmol) | (−) | |
| | CNT-A (as synthesized) | 84.66 | 595.30 | 0.0138 | 0.9914 | | CNT-E (as synthesized) | 103.86 | 8433.29 | 0.0009 | 0.9998 | | CNT-A-AM | 80.09 | 1779.68 | 0.0039 | 0.9309 | | CNT-E-AM | 99.83 | 2085.33 | 0.0036 | 0.9442 | | CNT-A-HM | 93.15 | 2171.75 | 0.0036 | 0.9870 | | CNT-E-HM | 182.71 | 2594.46 | 0.0057 | 0.9402 |
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| (b) |
| | CNTs | Freundlich isotherm | | (mmol/kg)/(mmol/L)1/n | (−) | | |
| | CNT-A (as synthesized) | 138.31 | 5.28 | 0.1895 | 0.9624 | | CNT-E (as synthesized) | 134.55 | 10.64 | 0.0940 | 0.6392 | | CNT-A-AM | 112.77 | 7.63 | 0.1310 | 0.9017 | | CNT-E-AM | 142.32 | 7.36 | 0.1358 | 0.9034 | | CNT-A-HM | 144.34 | 6.02 | 0.1662 | 0.9020 | | CNT-E-HM | 335.04 | 5.58 | 0.1793 | 0.8621 |
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| (c) |
| | CNTs | Redlich-Peterson | | (L/g) | (L/mmol) | (mmol/kg) | (−) | |
| | CNT-A (as synthesized) | 51.10 | 609.38 | 83.86 | 0.9970 | 0.9915 | | CNT-E (as synthesized) | 1259.21 | 11955.74 | 105.32 | 0.9980 | 0.8738 | | CNT-A-AM | 241.88 | 3679.08 | 65.74 | 0.9350 | 0.9979 | | CNT-E-AM | 276.29 | 3193.16 | 86.52 | 0.9530 | 0.9976 | | CNT-A-HM | 403.62 | 5893.01 | 68.49 | 0.9000 | 0.8789 | | CNT-E-HM | 681.96 | 4360.55 | 156.39 | 0.9300 | 0.9343 |
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