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Hierarchical structure ZSM-5/SBA-15 composite with improved hydrophobicity for adsorption-desorption behavior of toluene.

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Title: Hierarchical structure ZSM-5/SBA-15 composite with improved hydrophobicity for adsorption-desorption behavior of toluene.
Authors: Li, Renna1 (AUTHOR), Xue, Tianshan1 (AUTHOR), Li, Zhe1 (AUTHOR), Wang, Qiang1 (AUTHOR) qiangwang@bjfu.edu.cn
Source: Chemical Engineering Journal. Jul2020, Vol. 392, pN.PAG-N.PAG. 1p.
Subjects: Toluene, Composite structures, Adsorption capacity, Volatile organic compounds, Contact angle, Humidity, Sorbents
Abstract: • Hierarchically structured ZSM-5/SBA-15 with different morphologies were prepared. • Multi-pores shortened diffusion pathway and increased toluene adsorption capacity. • The composites possess stronger hydrophobicity due to higher amount of Q4 groups. • The composites breakthrough time were increased by 2.5–4.6 times compared with ZSM-5. • ZSM-5/SBA-15-hexagonal prism exhibited the best adsorption performance of toluene. Hydrophobic zeolites have been considered as one of the most promising adsorbents for capturing volatile organic compounds (VOCs). In this contribution, hierarchically structured ZSM-5/SBA-15 composites with different morphologies including platelet, hexagonal prism, long-hexagonal prism, and long-rod were prepared. All materials were characterized using XRD, SEM, and TEM-EDX, which confirmed that the high dispersion of two zeolites within the composites. Due to the presence of intracrystalline mesopores that could shorten the diffusion pathway of toluene, the composites resulted in increased effective diffusion and higher adsorption capacity. The composites also possess higher hydrophobicity, leading to much better toluene adsorption performance under humid conditions. The water contact angle of ZSM-5 could be increased from 15.6° to 44.9° by forming well dispersed zeolite composites. The 29Si MAS NMR results confirmed that the composites possess higher amount of Q4 groups (75.3%–80.1%), which is the intrinsic reason for higher hydrophobicity. Notably, ZSM-5/SBA-15-hexagonal prism resulted in the best adsorption performance and cycling stability when compared with pure ZSM-5, the breakthrough time was increased from 20.8 to 49.4 min under dry conditions and from 5.9 to 27.3 min in the presence of 50% relative humidity. This work represents an important scheme for making hydrophobic zeolite-based VOCs adsorbents with also improved toluene diffusion properties due to the unique hierarchical porous structure. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 142653212
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Hierarchical structure ZSM-5/SBA-15 composite with improved hydrophobicity for adsorption-desorption behavior of toluene.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Renna%22">Li, Renna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xue%2C+Tianshan%22">Xue, Tianshan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Zhe%22">Li, Zhe</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Qiang%22">Wang, Qiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> qiangwang@bjfu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Journal%22">Chemical Engineering Journal</searchLink>. Jul2020, Vol. 392, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Toluene%22">Toluene</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+structures%22">Composite structures</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+capacity%22">Adsorption capacity</searchLink><br /><searchLink fieldCode="DE" term="%22Volatile+organic+compounds%22">Volatile organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Contact+angle%22">Contact angle</searchLink><br /><searchLink fieldCode="DE" term="%22Humidity%22">Humidity</searchLink><br /><searchLink fieldCode="DE" term="%22Sorbents%22">Sorbents</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Hierarchically structured ZSM-5/SBA-15 with different morphologies were prepared. • Multi-pores shortened diffusion pathway and increased toluene adsorption capacity. • The composites possess stronger hydrophobicity due to higher amount of Q4 groups. • The composites breakthrough time were increased by 2.5–4.6 times compared with ZSM-5. • ZSM-5/SBA-15-hexagonal prism exhibited the best adsorption performance of toluene. Hydrophobic zeolites have been considered as one of the most promising adsorbents for capturing volatile organic compounds (VOCs). In this contribution, hierarchically structured ZSM-5/SBA-15 composites with different morphologies including platelet, hexagonal prism, long-hexagonal prism, and long-rod were prepared. All materials were characterized using XRD, SEM, and TEM-EDX, which confirmed that the high dispersion of two zeolites within the composites. Due to the presence of intracrystalline mesopores that could shorten the diffusion pathway of toluene, the composites resulted in increased effective diffusion and higher adsorption capacity. The composites also possess higher hydrophobicity, leading to much better toluene adsorption performance under humid conditions. The water contact angle of ZSM-5 could be increased from 15.6° to 44.9° by forming well dispersed zeolite composites. The 29Si MAS NMR results confirmed that the composites possess higher amount of Q4 groups (75.3%–80.1%), which is the intrinsic reason for higher hydrophobicity. Notably, ZSM-5/SBA-15-hexagonal prism resulted in the best adsorption performance and cycling stability when compared with pure ZSM-5, the breakthrough time was increased from 20.8 to 49.4 min under dry conditions and from 5.9 to 27.3 min in the presence of 50% relative humidity. This work represents an important scheme for making hydrophobic zeolite-based VOCs adsorbents with also improved toluene diffusion properties due to the unique hierarchical porous structure. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.cej.2020.124861
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Toluene
        Type: general
      – SubjectFull: Composite structures
        Type: general
      – SubjectFull: Adsorption capacity
        Type: general
      – SubjectFull: Volatile organic compounds
        Type: general
      – SubjectFull: Contact angle
        Type: general
      – SubjectFull: Humidity
        Type: general
      – SubjectFull: Sorbents
        Type: general
    Titles:
      – TitleFull: Hierarchical structure ZSM-5/SBA-15 composite with improved hydrophobicity for adsorption-desorption behavior of toluene.
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            NameFull: Li, Renna
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            NameFull: Xue, Tianshan
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            NameFull: Li, Zhe
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            NameFull: Wang, Qiang
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              M: 07
              Text: Jul2020
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              Y: 2020
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              Value: 392
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            – TitleFull: Chemical Engineering Journal
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