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SCIENCE CHINA Technological Sciences, Volume 62, Issue 6: 958-964(2019) https://doi.org/10.1007/s11431-018-9389-7

Structural control of silica aerogel fibers for methylene blue removal

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  • ReceivedOct 8, 2018
  • AcceptedNov 5, 2018
  • PublishedFeb 15, 2019

Abstract

The development of efficient adsorbents is significant for the miniaturization and cost reduction of water purifying facility. In our previous study, a new kind of silica aerogel fibers (SAFs) with hierarchical structure and hollow structure were developed, which shows outstanding mass transport property and adsorption performance. Herein, we further control and study the hierarchical structure and hollow structure of silica aerogel fibers by changing the sulfuric acid concentration of ageing bath and spinning speed. For removing methylene blue, A0W120 SAFs sample, with DI water as ageing bath and a winding speed of 120 mm/s, presents the best mass transport property and adsorption performance, as they possess larger pore sizes in the outer layer, thinner fiber wall and higher degree of hollowness. The removal rates of methylene blue by A0W120 SAFs sample is up to 91.6% and 98.2% in 2 and 5 min, respectively, which are at least 30% higher than other comparable commercial adsorbents, while the adsorption capacity of methylene blue reaches up to 139.1 mg/g.


Funded by

This study was supported by the Shanghai Fundamental Research Projects(Grant,No.,16JC1400701)

the National Natural Science Foundation of China(Grant,No.,51733002)

and the Changjiang Scholars and Innovative Research Team in University(IRT16R13)


Acknowledgment

This work was supported by the Shanghai Fundamental Research Projects (Grant No. 16JC1400701), the National Natural Science Foundation of China (Grant No. 51733002), and the Changjiang Scholars and Innovative Research Team in University (Grant No. IRT16R13).


Supplement

Supporting Information

The supporting information is available online at tech.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    (Color online) Surfaces morphology SEM images (a)–(e) and cross-section SEM images (f)–(j) of SAFs prepared using different concentrations of sulphuric acid as ageing bath. (a), (f) A0.5W80; (b), (g) A0.1W80; (c), (h) A0.05W80; (d), (i) A0.01W80; (e), (j) A0W80. With decreasing ageing sulfuric acid concentration, the pores sizes and thickness of loose layer starts with a downtrend, following by a uptrend shortly after.

  • Figure 2

    (Color online) The proposed mechanisms for the morphology changing of SAFs prepared using different concentrations of sulphuric acid as ageing bath.

  • Figure 3

    (Color online) (a) Adsorption rate curves of MB after the addition of SAFs prepared using different concentrations of sulphuric acid as ageing bath; (b) comparisons of removal rates of MB by different SAFs in 2 and 5 min.

  • Figure 4

    (Color online) The hollow structure and surfaces morphology SEM images of SAFs prepared at different spinning speed. Hollow structure: (a) A0W80; (b) A0W100; (c) A0W120; surfaces morphology: (d) A0W80; (e) A0W100; (f) A0W120.

  • Figure 5

    (Color online) (a) Adsorption rate curves of MB after the addition of SAFs prepared at different spinning speed; (b) comparisons of removal rates of MB by different SAFs in 2 and 5 min; (c) adsorption rate curves of MB after the addition of different adsorbents; (d) comparisons of removal rates of MB by different adsorbents in 2 and 5 min.

  • Table 1   Preparation parameters for different SAFs

    Sample

    name

    Extrusion speed

    (mL/min)

    Ageing bath concentration

    (mol/L)

    Winding speed

    (mm/s)

    Spinneret draft ratio

    A0.5W80

    0.16

    0.5

    80

    4.8

    A0.1W80

    0.16

    0.1

    80

    4.8

    A0.05W80

    0.16

    0.05

    80

    4.8

    A0.01W80

    0.16

    0.01

    80

    4.8

    A0W80

    0.16

    0

    80

    4.8

    A0W100

    0.20

    0

    100

    4.8

    A0W120

    0.24

    0

    120

    4.8

    0 mol/L H2SO4 refers to deionized water

  • Table 2   Surface area, pore volume and pore diameter of SAFs prepared using different concentrations of sulphuric acid as ageing bath

    Sample

    Surface area

    (m²/g)

    Pore volume

    (cc/g)

    Pore diameter

    (nm)

    A0.5W80

    869

    0.72

    5

    A0.1W80

    863

    0.67

    5

    A0.05W80

    841

    0.67

    5

    A0.01W80

    835

    0.75

    5

    A0W80

    790

    0.55

    5

  • Table 3   Surface area, pore volume and pore diameter of SAFs prepared at different spinning speed

    Sample

    Surface area

    (m²/g)

    Pore Volume

    (cc/g)

    Pore diameter

    (nm)

    A0W80

    790

    0.55

    5

    A0W100

    756

    0.79

    5

    A0W120

    736

    0.82

    6

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