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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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FTIR spectrum of (A) raw C60; (B) C60(OH)n; (C) C60(C(COOH)2)n.
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pone-0072475-g003: FTIR spectrum of (A) raw C60; (B) C60(OH)n; (C) C60(C(COOH)2)n.

Mentions: Figure 3 shows the FTIR spectrum of raw C60, C60(OH)n and C60(C(COOH)2)n, respectively. For C60(OH)n (Figure 3B), the FTIR shows a broad hydroxyl adsorption centered at 3234 cm−1, the peak at 1609 cm−1 can be assigned to the C = C stretching vibration mode. The peak at 1086 and 1365 cm−1 are related to C−O stretching vibration mode and −OH in-plane bending vibration mode. These peaks are all the infrared characteristic peaks of C60(OH)n[34]. The FTIR spectrum of C60(C(COOH)2)n (Figure 3C) exhibits main peaks at 3439, 1718, 1201 and 523 cm−1. A previous report [35] suggested that hydroxyl (−OH), carbonyl (>C = O) and carboxyl (−C−O) were present on the surfaces of C60(C(COOH)2)n.


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)

FTIR spectrum of (A) raw C60; (B) C60(OH)n; (C) C60(C(COOH)2)n.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0072475-g003: FTIR spectrum of (A) raw C60; (B) C60(OH)n; (C) C60(C(COOH)2)n.
Mentions: Figure 3 shows the FTIR spectrum of raw C60, C60(OH)n and C60(C(COOH)2)n, respectively. For C60(OH)n (Figure 3B), the FTIR shows a broad hydroxyl adsorption centered at 3234 cm−1, the peak at 1609 cm−1 can be assigned to the C = C stretching vibration mode. The peak at 1086 and 1365 cm−1 are related to C−O stretching vibration mode and −OH in-plane bending vibration mode. These peaks are all the infrared characteristic peaks of C60(OH)n[34]. The FTIR spectrum of C60(C(COOH)2)n (Figure 3C) exhibits main peaks at 3439, 1718, 1201 and 523 cm−1. A previous report [35] suggested that hydroxyl (−OH), carbonyl (>C = O) and carboxyl (−C−O) were present on the surfaces of C60(C(COOH)2)n.

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