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. 2012 Sep 3;9(1):5.
doi: 10.1186/1735-2746-9-5.

Comparison of 4-chloro-2-nitrophenol adsorption on single-walled and multi-walled carbon nanotubes

Ali Mehrizad  1 , Mehran Aghaie, Parvin Gharbani, Siavoush Dastmalchi, Majid Monajjemi, Karim Zare
Affiliations

Comparison of 4-chloro-2-nitrophenol adsorption on single-walled and multi-walled carbon nanotubes

Ali Mehrizad et al. Iranian J Environ Health Sci Eng. .

Abstract

The adsorption characteristics of 4-chloro-2-nitrophenol (4C2NP) onto single-walled and multi-walled carbon nanotubes (SWCNTs and MWCNTs) from aqueous solution were investigated with respect to the changes in the contact time, pH of solution, carbon nanotubes dosage and initial 4C2NP concentration. Experimental results showed that the adsorption efficiency of 4C2NP by carbon nanotubes (both of SWCNTs and MWCNTs) increased with increasing the initial 4C2NP concentration. The maximum adsorption took place in the pH range of 2-6. The linear correlation coefficients of different isotherm models were obtained. Results revealed that the Langmuir isotherm fitted the experimental data better than the others and based on the Langmuir model equation, maximum adsorption capacity of 4C2NP onto SWCNTs and MWCNTs were 1.44 and 4.42 mg/g, respectively. The observed changes in the standard Gibbs free energy, standard enthalpy and standard entropy showed that the adsorption of 4C2NP onto SWCNTs and MWCNTs is spontaneous and exothermic in the temperature range of 298-328 K.

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Figures

Figure 1
Figure 1
Effect of contact time on 4C2NP adsorption onto CNTs; [4C2NP]0 = 10 mg/L; pH = 6; CNTs dose = 0.1 g; 25°C.
Figure 2
Figure 2
Effect of CNTs dose on 4C2NP adsorption; [4C2NP]0 = 10 mg/L; pH = 6; 25°C; contact time = 60 min.
Figure 3
Figure 3
Effect of pH on 4C2NP adsorption onto CNTs; [4C2NP]0 = 10 mg/L; CNTs dose = 0.1 g; 25°C; contact time = 60 min.
Figure 4
Figure 4
Effect of 4C2NP initial conc. on its adsorption onto CNTs; pH = 6; CNTs dose = 0.1 g; 25°C; contact time = 60 min.
Figure 5
Figure 5
Plot of LnK0vs. 1/T; [4C2NP]0 = 10 mg/L; pH = 6; CNTs dose = 0.1 g; contact time = 60 min.
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