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Adsorption of Cu(II) on oxidized multi-walled carbon nanotubes in the presence of hydroxylated and carboxylated fullerenes.

Wang J, Li Z, Li S, Qi W, Liu P, Liu F, Ye Y, Wu L, Wang L, Wu W - PLoS ONE (2013)

Bottom Line: The effect of C60(OH)n on Cu(II) adsorption of oMWCNTs was not significant at low C60(OH)n concentration, whereas a negative effect was observed at higher concentration.The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH ≥ 5.The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C60(OH)n and fitted the experimental data well.

View Article: PubMed Central - PubMed

Affiliation: Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, PR China.

ABSTRACT
The adsorption of Cu(II) on oxidized multi-walled carbon nanotubes (oMWCNTs) as a function of contact time, pH, ionic strength, temperature, and hydroxylated fullerene (C60(OH)n) and carboxylated fullerene (C60(C(COOH)2)n) were studied under ambient conditions using batch techniques. The results showed that the adsorption of Cu(II) had rapidly reached equilibrium and the kinetic process was well described by a pseudo-second-order rate model. Cu(II) adsorption on oMWCNTs was dependent on pH but independent of ionic strength. Compared with the Freundlich model, the Langmuir model was more suitable for analyzing the adsorption isotherms. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that Cu(II) adsorption on oMWCNTs was spontaneous and endothermic. The effect of C60(OH)n on Cu(II) adsorption of oMWCNTs was not significant at low C60(OH)n concentration, whereas a negative effect was observed at higher concentration. The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH ≥ 5. The presence of C60(C(COOH)2)n inhibited the adsorption of Cu(II) onto oMWCNTs at pH 4-6. The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C60(OH)n and fitted the experimental data well.

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Adsorption isotherms of Cu(II) on oMWCNTs at three different temperatures, m/V  = 0.5 g/L, pH = 4.00±0.05, I = 0.01 mol/L NaCl, C[Cu2+]initial  = 1.87×10−4mol/L.Symbols denote experimental data, dotted lines represent the model fitting to the Langmuir equation, solid lines represent the model fitting to the Freundlich equation.
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pone-0072475-g007: Adsorption isotherms of Cu(II) on oMWCNTs at three different temperatures, m/V  = 0.5 g/L, pH = 4.00±0.05, I = 0.01 mol/L NaCl, C[Cu2+]initial  = 1.87×10−4mol/L.Symbols denote experimental data, dotted lines represent the model fitting to the Langmuir equation, solid lines represent the model fitting to the Freundlich equation.

Mentions: Figure 7 shows the isotherm for Cu(II) adsorption onto oMWCNTs. In order to describe the adsorption of Cu(II) on the oMWCNTs more accurately, the Langmuir and Freundlich models were employed to fit the experimental isotherm data. The general form of the Langmuir model is:


Adsorption of Cu(II) on oxidized multi-walled carbon nanotubes in the presence of hydroxylated and carboxylated fullerenes.

Wang J, Li Z, Li S, Qi W, Liu P, Liu F, Ye Y, Wu L, Wang L, Wu W - PLoS ONE (2013)

Adsorption isotherms of Cu(II) on oMWCNTs at three different temperatures, m/V  = 0.5 g/L, pH = 4.00±0.05, I = 0.01 mol/L NaCl, C[Cu2+]initial  = 1.87×10−4mol/L.Symbols denote experimental data, dotted lines represent the model fitting to the Langmuir equation, solid lines represent the model fitting to the Freundlich equation.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3756995&req=5

pone-0072475-g007: Adsorption isotherms of Cu(II) on oMWCNTs at three different temperatures, m/V  = 0.5 g/L, pH = 4.00±0.05, I = 0.01 mol/L NaCl, C[Cu2+]initial  = 1.87×10−4mol/L.Symbols denote experimental data, dotted lines represent the model fitting to the Langmuir equation, solid lines represent the model fitting to the Freundlich equation.
Mentions: Figure 7 shows the isotherm for Cu(II) adsorption onto oMWCNTs. In order to describe the adsorption of Cu(II) on the oMWCNTs more accurately, the Langmuir and Freundlich models were employed to fit the experimental isotherm data. The general form of the Langmuir model is:

Bottom Line: The effect of C60(OH)n on Cu(II) adsorption of oMWCNTs was not significant at low C60(OH)n concentration, whereas a negative effect was observed at higher concentration.The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH ≥ 5.The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C60(OH)n and fitted the experimental data well.

View Article: PubMed Central - PubMed

Affiliation: Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, PR China.

ABSTRACT
The adsorption of Cu(II) on oxidized multi-walled carbon nanotubes (oMWCNTs) as a function of contact time, pH, ionic strength, temperature, and hydroxylated fullerene (C60(OH)n) and carboxylated fullerene (C60(C(COOH)2)n) were studied under ambient conditions using batch techniques. The results showed that the adsorption of Cu(II) had rapidly reached equilibrium and the kinetic process was well described by a pseudo-second-order rate model. Cu(II) adsorption on oMWCNTs was dependent on pH but independent of ionic strength. Compared with the Freundlich model, the Langmuir model was more suitable for analyzing the adsorption isotherms. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that Cu(II) adsorption on oMWCNTs was spontaneous and endothermic. The effect of C60(OH)n on Cu(II) adsorption of oMWCNTs was not significant at low C60(OH)n concentration, whereas a negative effect was observed at higher concentration. The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH ≥ 5. The presence of C60(C(COOH)2)n inhibited the adsorption of Cu(II) onto oMWCNTs at pH 4-6. The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C60(OH)n and fitted the experimental data well.

Show MeSH
Related in: MedlinePlus