Removal of Humic Acids in Water by Carbon Nanotubes

Yung Pin Tsai; Reuy An Doong; Jhih Ci Yang; Po Chi Chuang; Chen Chiang Chou; Jan Wei Lin

doi:10.4028/www.scientific.net/AMR.747.221

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 747Removal of Humic Acids in Water by Carbon...

Removal of Humic Acids in Water by Carbon Nanotubes

Abstract:

This study used multi-walled carbon nanotubes (MWCNTs) to remove humic acids (HA) in water. Experimental results showed the adsorption data fit pseudo-second order model well. The adsorption capacity of CNTs increased with increasing initial concentration of HA until reaching a stable capacity at 80 mgl^-1 of HA. The capacity also increased with decreasing pH values in solution. Statistical paired T test showed the adsorption capacity at 40°C was significantly larger than those at 10°C and 25°C. The adsorption capacities after 24 h contact time at 10, 25, and 40°C were 58.6, 60.5, and 84.7 mgg^-1, respectively. Three common sorption isotherm models, including the Langmuir, Freundlich, and DubininRadushkevich (D-R) models, were employed to fit the isotherm data. Results showed the theoretical saturation capacity (Q_max) in the Langmuir model increased with increasing temperature and the capacity constant (K_f) in the Freundlich model also increased with increasing temperature. The intensity constants (n) implied HA is favorably adsorbed onto CNTs. The maximum HA adsorption capacity (q_max) in the D-R model increased with increasing temperature. All the three models suggested the adsorption process is endothermic. The extremely low values (0.4-0.5 kJ mol^-1) of mean sorption energies (E) calculated from the D-R model suggested the adsorption of HA by MWCNTs is physical nature.

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Advanced Materials Research (Volume 747)

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221-224

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https://doi.org/10.4028/www.scientific.net/AMR.747.221

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August 2013

Authors:

Yung Pin Tsai, Reuy An Doong, Jhih Ci Yang, Po Chi Chuang, Chen Chiang Chou, Jan Wei Lin

Keywords:

Adsorption, Carbon Nanotube (CN), Humic Acid (HA), Isotherm Model

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