The role of amine in the sequestration of as (III) on functionalized indium tin oxide

Prescott E. Evans, Andrew J. Yost, Kayleigh A. McElveen, Qin Yin Shi, Thilini K. Ekanayaka, Ashis K. Manna, Vicki L Schlegel, Peter A. Dowben, Rebecca Y. Lai, Shikha Varma

Research output: Contribution to journalArticlepeer-review

Abstract

The influence of arsenite (As(III)) adsorption on 3-amino-propyl phosphonic-acid (3APPA) has been investigated using X-ray photoemission spectroscopy (XPS), vibrational IR and Raman spectroscopy. The functional amino group on 3APPA appears to play a significant role in the adsorption mechanism. Results of a combined experimental and theoretical investigation provide a comprehensive picture of the geometry and vibrational properties of 3APPA monolayers after interaction with arsenite. Experimental and scaled calculated IR properties display good agreement for the model case where NH2 groups, located as pendant groups on 3APPA surface, interact with the adsorbed As-O network. A charge transfer to the As-O moiety is also indicated by XPS measurements and ionization potential maps generated by DFT. Thus, 3APPA, as a functionalized bio-adsorbant, shows promise towards detection and remediation of As(III) in contaminated wastewater.

Original languageEnglish (US)
Article number147652
JournalApplied Surface Science
Volume538
DOIs
StatePublished - Feb 1 2021

Keywords

  • 3-amino-propyl phosphonic-acid
  • Arsenic
  • DFT
  • IR
  • Raman
  • XPS

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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