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Significantly enhanced dye removal performance of hollow tin oxide nanoparticles via carbon coating in dark environment and study of its mechanism.

Yang S, Wu Z, Huang L, Zhou B, Lei M, Sun L, Tian Q, Pan J, Wu W, Zhang H - Nanoscale Res Lett (2014)

Bottom Line: The resulting products were characterized in terms of morphology, composition, and surface property by various analytical techniques.Moreover, the SnO2@C hollow nanoparticles are shown to be effective adsorbents for removing four different dyes from aqueous solutions, which is superior to the pure hollow SnO2 nanoparticles and commercial SnO2.The enhanced mechanism has also been discussed, which can be attributed to the high specific surface areas after carbon coating.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, People's Republic of China ; Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan 430072, People's Republic of China.

ABSTRACT
Understanding the correlation between physicochemical properties and morphology of nanostructures is a prerequisite for widespread applications of nanomaterials in environmental application areas. Herein, we illustrated that the uniform-sized SnO2@C hollow nanoparticles were large-scale synthesized by a facile hydrothermal method. The size of the core-shell hollow nanoparticles was about 56 nm, and the shell was composed of a solid carbon layer with a thickness of 2 ~ 3 nm. The resulting products were characterized in terms of morphology, composition, and surface property by various analytical techniques. Moreover, the SnO2@C hollow nanoparticles are shown to be effective adsorbents for removing four different dyes from aqueous solutions, which is superior to the pure hollow SnO2 nanoparticles and commercial SnO2. The enhanced mechanism has also been discussed, which can be attributed to the high specific surface areas after carbon coating.

No MeSH data available.


UV-vis absorption spectra. RhB (a), MB (b), Rh6G (c), and MO (d) when the hollow SnO2@C nanoparticles were present at different times (the insets are the photos of their dyes before and after being treated with the as-synthesized SnO2@C nanoparticles). The adsorption kinetics and adsorption isotherm with the corresponding dyes (e) and the comparison absorbance (f) for the removal rate of SnO2@C hollow nanoparticles (the concentration of dyes is as follows: RhB 10 mg/L, MB 5 mg/L, Rh6G 5 mg/L, and MO 5 mg/L).
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Figure 4: UV-vis absorption spectra. RhB (a), MB (b), Rh6G (c), and MO (d) when the hollow SnO2@C nanoparticles were present at different times (the insets are the photos of their dyes before and after being treated with the as-synthesized SnO2@C nanoparticles). The adsorption kinetics and adsorption isotherm with the corresponding dyes (e) and the comparison absorbance (f) for the removal rate of SnO2@C hollow nanoparticles (the concentration of dyes is as follows: RhB 10 mg/L, MB 5 mg/L, Rh6G 5 mg/L, and MO 5 mg/L).

Mentions: We also investigated the potential application of the as-synthesized carbon-coated hollow SnO2 nanoparticles to be used as an adsorbent in wastewater treatment. Figure 4 shows the time-dependent absorption spectra for different organic dyes (include RhB, Rh6G, MB, and MO) in 45 min, and the characteristic absorption of these dyes was used to monitor the process of adsorption. The used dyes are chemically stable and are common constituents of effluents in industries which demand an appropriate method to dispose them off. As shown in Figure 4a,b,c, we can see that the peak intensities at 554 nm for RhB, 664 nm for MB, and 525 nm for Rh6G decreased very quickly once the hollow SnO2@C were added. After only 45 min, these peaks became too weak to be observed, suggesting the high efficiency for removing these three dyes. Meanwhile, the insets of Figure 4a,b,c shows the change of the color of these three dyes in solution within 45 min. It can be seen that the color of the three dyes disappeared, suggesting that the chromophoric structure of RhB, MB, and Rh6G were decomposed. However, for the removal of MO, the color of the MO solutions did not disappear in 45 min (Figure 4d). This means that a part of the molecular structure of MO was not decomposed by SnO2@C and remained in the solution.


Significantly enhanced dye removal performance of hollow tin oxide nanoparticles via carbon coating in dark environment and study of its mechanism.

Yang S, Wu Z, Huang L, Zhou B, Lei M, Sun L, Tian Q, Pan J, Wu W, Zhang H - Nanoscale Res Lett (2014)

UV-vis absorption spectra. RhB (a), MB (b), Rh6G (c), and MO (d) when the hollow SnO2@C nanoparticles were present at different times (the insets are the photos of their dyes before and after being treated with the as-synthesized SnO2@C nanoparticles). The adsorption kinetics and adsorption isotherm with the corresponding dyes (e) and the comparison absorbance (f) for the removal rate of SnO2@C hollow nanoparticles (the concentration of dyes is as follows: RhB 10 mg/L, MB 5 mg/L, Rh6G 5 mg/L, and MO 5 mg/L).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150862&req=5

Figure 4: UV-vis absorption spectra. RhB (a), MB (b), Rh6G (c), and MO (d) when the hollow SnO2@C nanoparticles were present at different times (the insets are the photos of their dyes before and after being treated with the as-synthesized SnO2@C nanoparticles). The adsorption kinetics and adsorption isotherm with the corresponding dyes (e) and the comparison absorbance (f) for the removal rate of SnO2@C hollow nanoparticles (the concentration of dyes is as follows: RhB 10 mg/L, MB 5 mg/L, Rh6G 5 mg/L, and MO 5 mg/L).
Mentions: We also investigated the potential application of the as-synthesized carbon-coated hollow SnO2 nanoparticles to be used as an adsorbent in wastewater treatment. Figure 4 shows the time-dependent absorption spectra for different organic dyes (include RhB, Rh6G, MB, and MO) in 45 min, and the characteristic absorption of these dyes was used to monitor the process of adsorption. The used dyes are chemically stable and are common constituents of effluents in industries which demand an appropriate method to dispose them off. As shown in Figure 4a,b,c, we can see that the peak intensities at 554 nm for RhB, 664 nm for MB, and 525 nm for Rh6G decreased very quickly once the hollow SnO2@C were added. After only 45 min, these peaks became too weak to be observed, suggesting the high efficiency for removing these three dyes. Meanwhile, the insets of Figure 4a,b,c shows the change of the color of these three dyes in solution within 45 min. It can be seen that the color of the three dyes disappeared, suggesting that the chromophoric structure of RhB, MB, and Rh6G were decomposed. However, for the removal of MO, the color of the MO solutions did not disappear in 45 min (Figure 4d). This means that a part of the molecular structure of MO was not decomposed by SnO2@C and remained in the solution.

Bottom Line: The resulting products were characterized in terms of morphology, composition, and surface property by various analytical techniques.Moreover, the SnO2@C hollow nanoparticles are shown to be effective adsorbents for removing four different dyes from aqueous solutions, which is superior to the pure hollow SnO2 nanoparticles and commercial SnO2.The enhanced mechanism has also been discussed, which can be attributed to the high specific surface areas after carbon coating.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, People's Republic of China ; Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan 430072, People's Republic of China.

ABSTRACT
Understanding the correlation between physicochemical properties and morphology of nanostructures is a prerequisite for widespread applications of nanomaterials in environmental application areas. Herein, we illustrated that the uniform-sized SnO2@C hollow nanoparticles were large-scale synthesized by a facile hydrothermal method. The size of the core-shell hollow nanoparticles was about 56 nm, and the shell was composed of a solid carbon layer with a thickness of 2 ~ 3 nm. The resulting products were characterized in terms of morphology, composition, and surface property by various analytical techniques. Moreover, the SnO2@C hollow nanoparticles are shown to be effective adsorbents for removing four different dyes from aqueous solutions, which is superior to the pure hollow SnO2 nanoparticles and commercial SnO2. The enhanced mechanism has also been discussed, which can be attributed to the high specific surface areas after carbon coating.

No MeSH data available.