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Adsorptive removal of Hg2+ from aqueous solutions using amino phenyl-pyrazole-functionalized graphene oxide

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(5), pp.493-508
  • DOI : 10.1007/s42823-019-00119-8
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 24, 2019
  • Accepted : January 3, 2020
  • Published : October 1, 2020

Alimohammady Mobina 1 Ghaemi Mehdi 1

1Golestan University

Accredited

ABSTRACT

The aim of this work is to investigate the ability of a new functionalized graphene oxide 3-amino-5-phenylpyrazole (F-GO) in the adsorption and removal of Hg2+ from aqueous solution. Both untreated graphene oxide (GO) and F-GO were char�acterized using FT-IR, EDX, FE-SEM, XRD and TGA analysis. The efects of three operational variables (pH, adsorbent dose and initial metal ion concentrations) on Hg2+ adsorption capacity of F-GO were investigated by central composite design. This technique aims to fnd a simple way to optimize the adsorption process and to analyze the interaction between the signifcant parameters. A quadratic model suggested for the analysis of variance found that the adsorption of metal ions heavily depend upon pH of the solution. The adsorption mechanism has been determined by pseudo-frst-order kinetic models and the adsorption behavior was modeled by Freundlich isotherm. Results demonstrated that the adsorption capacities of F-GO for removal of Hg2+ were generally higher than those of GO, which is attributed to a decrease in the agglomeration of graphene layers due to the presence of amino-functional moieties with their bulky phenyl groups. Thermodynamic data indicated that the functionalization signifcantly afects the thermostability of the GO precursor materials. The desorption study demonstrated favorable regenerability of the F-GO adsorbent, even after three adsorption–desorption cycles.

Citation status

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Total Citation Counts(KCI+WOS) (7) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (8) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2023-10-01)

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