Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption

Jin Hyeong Lee, Jeong Ann Park, Hee Gon Kim, Jung Hyun Lee, So Hye Cho, Keunsu Choi, Kyung Won Jung, Seung Yong Lee, Jae Woo Choi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Adsorption is a simple and effective method for the removal of hexavalent chromium (Cr(VI)) from contaminated water. Several amino silane–graphene oxide (GO) composites with different species of amino groups (pN-GO, psN-GO, and pssN-GO; p: primary, s: secondary, N: amine) were evaluated to investigate their adsorption capacity and the effects of primary and secondary amines on Cr(VI) adsorption. We conducted a quantitative analysis to reveal the difference between primary and secondary amines in terms of Cr(VI) removal efficiency. A synergic effect was observed between the neighboring secondary amines in pssN-GO. From the Langmuir model prediction, we found that the composite with pssN-GO exhibited the highest maximum adsorption capacity (260.74 mg/g), followed by those with psN-GO (208.22 mg/g) and pN-GO (189.47 mg/g). Monolayer adsorption was more dominant when using pssN-GO, with the pseudo-second-order model best fitting the kinetic experiment results, whereas multilayer adsorption was dominant when using psN-GO and pN-GO.

Original languageEnglish
Article number126387
JournalChemosphere
Volume251
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Adsorption
  • Amino silane
  • Functionalization
  • Graphene oxide
  • Hexavalent chromium

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this