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Chitosan hydrogel synthesis to remove arsenic and fluoride ions from groundwater.

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Title: Chitosan hydrogel synthesis to remove arsenic and fluoride ions from groundwater.
Authors: Burillo, Juan Carlos1 (AUTHOR) jburillo@uach.mx, Ballinas, Lourdes2 (AUTHOR), Burillo, Guillermina3 (AUTHOR), Guerrero-Lestarjette, Ernesto4 (AUTHOR), Lardizabal-Gutierrez, Daniel4 (AUTHOR), Silva-Hidalgo, Humberto1 (AUTHOR)
Source: Journal of Hazardous Materials. Sep2021, Vol. 417, pN.PAG-N.PAG. 1p.
Subjects: United States. Environmental Protection Agency, Fluorides, Freundlich isotherm equation, Groundwater, Chitosan, Arsenic, Drinking water, Calcite, Carbonates
Geographic Terms: Mexico
Abstract: Groundwater samples from eight deep drinking water wells that cover three aquifers in Chihuahua City, northern Mexico, were fully characterized. Water is naturally contaminated with arsenic, fluoride, and uranium, according to the Environmental Protection Agency (EPA) and local standards. The results from the Geochemist's Workbench (GWB) program revealed that the minerals in equilibrium with the groundwater were calcite and dolomite, while others, such as fluoride, schoepite, rutherfordite and K(UO 2)(AsO 4), were also dissolved. The hydrogeochemical characterization of water samples indicates that they were sodium bicarbonate-type water samples at neutral to slightly alkaline pH (7.6–8.3). A batch equilibrium sorption procedure was implemented using natural groundwater, a synthesized chitosan network (net -CS) and a chitosan binary network grafted with N-vinylcaprolactam/N-N-dimethylacrylamide (net -CS)-g-NVCL/DMAAm hydrogels. Isotherms and kinetics sorption tests were evaluated. The adsorption capacity of net -CS hydrogels for As ions was 0.0022 mg/g and F ions 0.15 mg/g after 50 h. Scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS) was used to investigate the hydrogel surface before and after the sorption process, and TGA was used to evaluate the stability of the adsorbents. Freundlich adsorption isotherm constants for As and F ions indicate heterogeneous sorption and the mechanism of retention by physisorption. [Display omitted] • Arsenic, fluoride and uranium in Mexican drinking groundwater, above Maximum Concentration Limits, was detected. • Na-HCO 3 water type at neutral to slightly alkaline pH. • Chitosan hydrogels simultaneously removed arsenic and fluoride from groundwater. • Sorption fitted to Freundlich model, thus adsorption energy is heterogeneous. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hazardous Materials 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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Header DbId: egs
DbLabel: Engineering Source
An: 151122328
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PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Chitosan hydrogel synthesis to remove arsenic and fluoride ions from groundwater.
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  Data: <searchLink fieldCode="AR" term="%22Burillo%2C+Juan+Carlos%22">Burillo, Juan Carlos</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jburillo@uach.mx</i><br /><searchLink fieldCode="AR" term="%22Ballinas%2C+Lourdes%22">Ballinas, Lourdes</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burillo%2C+Guillermina%22">Burillo, Guillermina</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guerrero-Lestarjette%2C+Ernesto%22">Guerrero-Lestarjette, Ernesto</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lardizabal-Gutierrez%2C+Daniel%22">Lardizabal-Gutierrez, Daniel</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Silva-Hidalgo%2C+Humberto%22">Silva-Hidalgo, Humberto</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Hazardous+Materials%22">Journal of Hazardous Materials</searchLink>. Sep2021, Vol. 417, pN.PAG-N.PAG. 1p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22United+States%2E+Environmental+Protection+Agency%22">United States. Environmental Protection Agency</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorides%22">Fluorides</searchLink><br /><searchLink fieldCode="DE" term="%22Freundlich+isotherm+equation%22">Freundlich isotherm equation</searchLink><br /><searchLink fieldCode="DE" term="%22Groundwater%22">Groundwater</searchLink><br /><searchLink fieldCode="DE" term="%22Chitosan%22">Chitosan</searchLink><br /><searchLink fieldCode="DE" term="%22Arsenic%22">Arsenic</searchLink><br /><searchLink fieldCode="DE" term="%22Drinking+water%22">Drinking water</searchLink><br /><searchLink fieldCode="DE" term="%22Calcite%22">Calcite</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonates%22">Carbonates</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Mexico%22">Mexico</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Groundwater samples from eight deep drinking water wells that cover three aquifers in Chihuahua City, northern Mexico, were fully characterized. Water is naturally contaminated with arsenic, fluoride, and uranium, according to the Environmental Protection Agency (EPA) and local standards. The results from the Geochemist's Workbench (GWB) program revealed that the minerals in equilibrium with the groundwater were calcite and dolomite, while others, such as fluoride, schoepite, rutherfordite and K(UO 2)(AsO 4), were also dissolved. The hydrogeochemical characterization of water samples indicates that they were sodium bicarbonate-type water samples at neutral to slightly alkaline pH (7.6–8.3). A batch equilibrium sorption procedure was implemented using natural groundwater, a synthesized chitosan network (net -CS) and a chitosan binary network grafted with N-vinylcaprolactam/N-N-dimethylacrylamide (net -CS)-g-NVCL/DMAAm hydrogels. Isotherms and kinetics sorption tests were evaluated. The adsorption capacity of net -CS hydrogels for As ions was 0.0022 mg/g and F ions 0.15 mg/g after 50 h. Scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS) was used to investigate the hydrogel surface before and after the sorption process, and TGA was used to evaluate the stability of the adsorbents. Freundlich adsorption isotherm constants for As and F ions indicate heterogeneous sorption and the mechanism of retention by physisorption. [Display omitted] • Arsenic, fluoride and uranium in Mexican drinking groundwater, above Maximum Concentration Limits, was detected. • Na-HCO 3 water type at neutral to slightly alkaline pH. • Chitosan hydrogels simultaneously removed arsenic and fluoride from groundwater. • Sorption fitted to Freundlich model, thus adsorption energy is heterogeneous. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Hazardous Materials 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:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jhazmat.2021.126070
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: United States. Environmental Protection Agency
        Type: general
      – SubjectFull: Fluorides
        Type: general
      – SubjectFull: Freundlich isotherm equation
        Type: general
      – SubjectFull: Groundwater
        Type: general
      – SubjectFull: Chitosan
        Type: general
      – SubjectFull: Arsenic
        Type: general
      – SubjectFull: Drinking water
        Type: general
      – SubjectFull: Calcite
        Type: general
      – SubjectFull: Carbonates
        Type: general
      – SubjectFull: Mexico
        Type: general
    Titles:
      – TitleFull: Chitosan hydrogel synthesis to remove arsenic and fluoride ions from groundwater.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Burillo, Juan Carlos
      – PersonEntity:
          Name:
            NameFull: Ballinas, Lourdes
      – PersonEntity:
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            NameFull: Burillo, Guillermina
      – PersonEntity:
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            NameFull: Guerrero-Lestarjette, Ernesto
      – PersonEntity:
          Name:
            NameFull: Lardizabal-Gutierrez, Daniel
      – PersonEntity:
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            NameFull: Silva-Hidalgo, Humberto
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          Dates:
            – D: 05
              M: 09
              Text: Sep2021
              Type: published
              Y: 2021
          Identifiers:
            – Type: issn-print
              Value: 03043894
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            – Type: volume
              Value: 417
          Titles:
            – TitleFull: Journal of Hazardous Materials
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