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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.


Adsorption kinetics and removal rate. (a) Adsorption kinetics and adsorption isotherm with the corresponding percentage removal of RhB at two different initial concentrations (C) with a contact time of 45 min (S1 and S4 are naked hollow SnO2 nanoparticles, S2 and S5 are hollow SnO2@C nanoparticles, and S3 and S6 are commercial SnO2 nanoparticles; the CRhB for S1 to S3 is 5 mg/L, and the CRhB for S4 to S6 is 10 mg/L). (b) The comparison of the removal rate of the different samples (S1: hollow SnO2, S2: hollow SnO2@C nanoparticles, S3: commercial SnO2).
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Figure 5: Adsorption kinetics and removal rate. (a) Adsorption kinetics and adsorption isotherm with the corresponding percentage removal of RhB at two different initial concentrations (C) with a contact time of 45 min (S1 and S4 are naked hollow SnO2 nanoparticles, S2 and S5 are hollow SnO2@C nanoparticles, and S3 and S6 are commercial SnO2 nanoparticles; the CRhB for S1 to S3 is 5 mg/L, and the CRhB for S4 to S6 is 10 mg/L). (b) The comparison of the removal rate of the different samples (S1: hollow SnO2, S2: hollow SnO2@C nanoparticles, S3: commercial SnO2).

Mentions: To further study the dye removal abilities of the as-prepared hollow SnO2@C nanoparticles, the dye removal performance of naked hollow SnO2 nanoparticles and commercial SnO2 nanoparticles (average size is 70 nm) was measured for comparison. Figure 5a shows the time-dependent adsorption kinetics of the samples at different initial RhB dye concentrations. Obviously, among all the samples, the hollow SnO2@C nanoparticles (samples S2 and S5) exhibit the fastest absorption abilities. As shown in Figure 5b, the removal rate of the hollow SnO2@C nanoparticles (S2) is highest among the three samples and can reach to 96.3% and 94.6% for the RhB dye with different concentration of 5 and 10 mg/L, respectively, which is much higher than that of S1 (naked hollow SnO2, 7.6% and 6.7%) and S3 (commercial SnO2, 7.4% and 8.9%). The above results demonstrate that carbon coating can significantly enhance the dye removal abilities. As a comparison, the measured results of the removal performance experiment of carbon sphere and hydrochloric acid-treated SnO2@C nanoparticles (SnO2 has been removed) are shown in Additional file 1: Figures S2 and S3. The results show that the as-prepared hollow SnO2@C nanoparticles' removal dye performance is better than those of pure carbon materials.


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)

Adsorption kinetics and removal rate. (a) Adsorption kinetics and adsorption isotherm with the corresponding percentage removal of RhB at two different initial concentrations (C) with a contact time of 45 min (S1 and S4 are naked hollow SnO2 nanoparticles, S2 and S5 are hollow SnO2@C nanoparticles, and S3 and S6 are commercial SnO2 nanoparticles; the CRhB for S1 to S3 is 5 mg/L, and the CRhB for S4 to S6 is 10 mg/L). (b) The comparison of the removal rate of the different samples (S1: hollow SnO2, S2: hollow SnO2@C nanoparticles, S3: commercial SnO2).
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Related In: Results  -  Collection

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Figure 5: Adsorption kinetics and removal rate. (a) Adsorption kinetics and adsorption isotherm with the corresponding percentage removal of RhB at two different initial concentrations (C) with a contact time of 45 min (S1 and S4 are naked hollow SnO2 nanoparticles, S2 and S5 are hollow SnO2@C nanoparticles, and S3 and S6 are commercial SnO2 nanoparticles; the CRhB for S1 to S3 is 5 mg/L, and the CRhB for S4 to S6 is 10 mg/L). (b) The comparison of the removal rate of the different samples (S1: hollow SnO2, S2: hollow SnO2@C nanoparticles, S3: commercial SnO2).
Mentions: To further study the dye removal abilities of the as-prepared hollow SnO2@C nanoparticles, the dye removal performance of naked hollow SnO2 nanoparticles and commercial SnO2 nanoparticles (average size is 70 nm) was measured for comparison. Figure 5a shows the time-dependent adsorption kinetics of the samples at different initial RhB dye concentrations. Obviously, among all the samples, the hollow SnO2@C nanoparticles (samples S2 and S5) exhibit the fastest absorption abilities. As shown in Figure 5b, the removal rate of the hollow SnO2@C nanoparticles (S2) is highest among the three samples and can reach to 96.3% and 94.6% for the RhB dye with different concentration of 5 and 10 mg/L, respectively, which is much higher than that of S1 (naked hollow SnO2, 7.6% and 6.7%) and S3 (commercial SnO2, 7.4% and 8.9%). The above results demonstrate that carbon coating can significantly enhance the dye removal abilities. As a comparison, the measured results of the removal performance experiment of carbon sphere and hydrochloric acid-treated SnO2@C nanoparticles (SnO2 has been removed) are shown in Additional file 1: Figures S2 and S3. The results show that the as-prepared hollow SnO2@C nanoparticles' removal dye performance is better than those of pure carbon materials.

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.