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Effective removal of Congo red from aqueous solutions using ethylenediamine-modified wheat straw as adsorbent.

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Title: Effective removal of Congo red from aqueous solutions using ethylenediamine-modified wheat straw as adsorbent.
Authors: Song, Yinghua1 (AUTHOR) yhswjyhs@126.com, Zeng, Xingling1 (AUTHOR), Peng, Rong1 (AUTHOR)
Source: Chemical Engineering Communications. 2024, Vol. 211 Issue 7, p1030-1042. 13p.
Subject Terms: *Wheat straw, *Congo red (Staining dye), *Aqueous solutions, *Adsorption capacity, *Hydrogen bonding, *Sorption
Abstract: In this study, ethylenediamine (EDA)-modified wheat straw (EMWS) was prepared and used as an efficient adsorbent for removing Congo red (CR) from aqueous solutions. Adsorption of CR by EMWS was examined through static adsorption experiments to determine the effect of contact time, initial pH values, particle size of the adsorbent, solution concentration, and temperature. As pH ranged from 4.0 to 10.0, CR adsorption by the EMWS remained considerably elevated. The equilibrium adsorption capacity was determined to be 97.92 mg·g−1 for a CR concentration of 400 mg·L−1, pH of 4.0, temperature of 318 K, and EMWS dose of 2 g·L−1, which was found to be comparable to other materials used for CR adsorption. Following that, optimal conditions were used to conduct isothermal, kinetic, and thermodynamic studies. In the adsorption process of CR, the Freundlich isotherm model and the pseudo-second-order (PSO) kinetics provided the best fit, indicating the presence of both physisorption and chemisorption mechanisms. Electrostatic attraction and hydrogen bonding were primarily responsible for CR adsorption onto the EMWS. Based on thermodynamic investigations, the adsorption of CR on EMWS is determined to be spontaneous (ΔG < 0) and endothermic (ΔH = 60.83 kJ·mol−1), while also exhibiting an increase in disorder (ΔS = 289.9 J·mol−1·K−1). The elution was carried out using 0.20 M HCl, followed by washing the EMWS with water, resulting in no loss of functionality. This study suggests that EMWS possesses the potential to serve as a feasible and efficient adsorbent for CR removal in wastewater. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 176862169
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PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
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  Data: Effective removal of Congo red from aqueous solutions using ethylenediamine-modified wheat straw as adsorbent.
– Name: Author
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Song%2C+Yinghua%22&quot;&gt;Song, Yinghua&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yhswjyhs@126.com&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zeng%2C+Xingling%22&quot;&gt;Zeng, Xingling&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Peng%2C+Rong%22&quot;&gt;Peng, Rong&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Chemical+Engineering+Communications%22&quot;&gt;Chemical Engineering Communications&lt;/searchLink&gt;. 2024, Vol. 211 Issue 7, p1030-1042. 13p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Wheat+straw%22&quot;&gt;Wheat straw&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Congo+red+%28Staining+dye%29%22&quot;&gt;Congo red (Staining dye)&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Aqueous+solutions%22&quot;&gt;Aqueous solutions&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Adsorption+capacity%22&quot;&gt;Adsorption capacity&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Hydrogen+bonding%22&quot;&gt;Hydrogen bonding&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Sorption%22&quot;&gt;Sorption&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this study, ethylenediamine (EDA)-modified wheat straw (EMWS) was prepared and used as an efficient adsorbent for removing Congo red (CR) from aqueous solutions. Adsorption of CR by EMWS was examined through static adsorption experiments to determine the effect of contact time, initial pH values, particle size of the adsorbent, solution concentration, and temperature. As pH ranged from 4.0 to 10.0, CR adsorption by the EMWS remained considerably elevated. The equilibrium adsorption capacity was determined to be 97.92 mg&#183;g−1 for a CR concentration of 400 mg&#183;L−1, pH of 4.0, temperature of 318 K, and EMWS dose of 2 g&#183;L−1, which was found to be comparable to other materials used for CR adsorption. Following that, optimal conditions were used to conduct isothermal, kinetic, and thermodynamic studies. In the adsorption process of CR, the Freundlich isotherm model and the pseudo-second-order (PSO) kinetics provided the best fit, indicating the presence of both physisorption and chemisorption mechanisms. Electrostatic attraction and hydrogen bonding were primarily responsible for CR adsorption onto the EMWS. Based on thermodynamic investigations, the adsorption of CR on EMWS is determined to be spontaneous (ΔG &lt; 0) and endothermic (ΔH = 60.83 kJ&#183;mol−1), while also exhibiting an increase in disorder (ΔS = 289.9 J&#183;mol−1&#183;K−1). The elution was carried out using 0.20 M HCl, followed by washing the EMWS with water, resulting in no loss of functionality. This study suggests that EMWS possesses the potential to serve as a feasible and efficient adsorbent for CR removal in wastewater. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/00986445.2024.2324453
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 1030
    Subjects:
      – SubjectFull: Wheat straw
        Type: general
      – SubjectFull: Congo red (Staining dye)
        Type: general
      – SubjectFull: Aqueous solutions
        Type: general
      – SubjectFull: Adsorption capacity
        Type: general
      – SubjectFull: Hydrogen bonding
        Type: general
      – SubjectFull: Sorption
        Type: general
    Titles:
      – TitleFull: Effective removal of Congo red from aqueous solutions using ethylenediamine-modified wheat straw as adsorbent.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Song, Yinghua
      – PersonEntity:
          Name:
            NameFull: Zeng, Xingling
      – PersonEntity:
          Name:
            NameFull: Peng, Rong
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          Dates:
            – D: 01
              M: 07
              Text: 2024
              Type: published
              Y: 2024
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              Value: 211
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            – TitleFull: Chemical Engineering Communications
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