Cristin-resultat-ID: 1817367
Sist endret: 3. august 2020, 16:01
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Floatable magnetic aerogel based on alkaline residue used for the convenient removal of heavy metals from wastewater

Bidragsytere:
  • Shaojie Wang
  • Huaitian Bu
  • Huojun Chen
  • Tian Hu
  • Wenzhao Chen
  • Jinhua Wu
  • mfl.

Tidsskrift

Chemical Engineering Journal
ISSN 1385-8947
e-ISSN 1873-3212
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Publisert online: 2020
Trykket: 2020
Volum: 399
Artikkelnummer: 125760

Importkilder

Scopus-ID: 2-s2.0-85086755939

Beskrivelse Beskrivelse

Tittel

Floatable magnetic aerogel based on alkaline residue used for the convenient removal of heavy metals from wastewater

Sammendrag

The present work introduces a novel strategy for preparation of a recyclable aerogel absorbent for heavy metal purification of industrial wastewater. The absorbent (Fe3O4/SA-AR) is based on a combination Fe3O4, alginate (SA) and industrial alkaline residue (AR) waste, forming a cost-efficient and easily recyclable spherical aerogel. The magnetic aerogel spheres of the Fe3O4/SA-AR are light-weight with a loose porous structure and a mechanical strength 10 times that of conventional SA aerogels, thus sustaining up to 20 cycles of compression-relaxation. This excellent structure stability guarantees long-term integrity and floatability of the aerogel spheres in water. Adsorption experiments on the heavy metal Cd(II) suggested that equilibrium was approached within 2 h. The maximum adsorption capacity was 38.83 mg/g, higher than reported for conventional SA aerogel absorbents. After 5 cycles of adsorption–desorption, the aerogel spheres still maintained an adsorption efficiency of 90%, and had good stability and reusability. Studies on kinetic and adsorption isotherm models showed that the adsorption of Cd(II) to Fe3O4/SA-AR correlated well with the pseudo-second-order kinetic model and the Langmuir isotherm model. FTIR, SEM-EDS and XPS analyses indicated that the adsorption of Cd(II) to the Fe3O4/SA-AR aerogel was mainly driven by formation of OH complexation, electrostatic adsorption and ion exchange. In summary, this work suggests a new route for synergetic resource utilization of value-less and pollutive alkaline residual for the removal of heavy metals in wastewater.

Bidragsytere

Shaojie Wang

  • Tilknyttet:
    Forfatter
    ved South China Agricultural University Guangzhou

Huaitian Bu

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

Huojun Chen

  • Tilknyttet:
    Forfatter
    ved South China Agricultural University Guangzhou

Tian Hu

  • Tilknyttet:
    Forfatter
    ved South China Agricultural University Guangzhou

Wenzhao Chen

  • Tilknyttet:
    Forfatter
    ved South China Agricultural University Guangzhou
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