The investigation of triadic silica-supported polyhexamethylene guanidine@nano-hydroxyapatite nanocomposites for Cr (VI) detection

Meihong Zhan, Weimin Gao, William Nguyen, Hongmei Yu*, Eric Amador, Wei Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Triadic silica-supported polyhexamethylene guanidine@nano-hydroxyapatite (HAP) composites were prepared and employed in a micro-column system for solid phase extraction of Cr (VI) with its determination by flame atomic absorption spectrometry (FAAS). It is found that the triadic silica-supported nano-HAP composites can efficiently adsorb Cr (VI) at pH 4.0–6.0, but absorb almost no Cr (III). The detection has a good linear range of 0.3–300 μg L−1, a detection limit of 0.09 μg L−1 (3σ, n = 11) and a precision of 1.3% (20 μg L−1, n = 11) on Cr (VI). The adsorption mechanisms are mainly electrostatic attraction and the channel effect. This method was successfully applied to the determination of chromium contents in cereal and water samples with recoveries of 99.5–109.8%.

Original languageEnglish
Article number100268
JournalMaterials Today Advances
Volume15
DOIs
Publication statusPublished - Aug 2022
Externally publishedYes

Keywords

  • Cr (VI)
  • Flame atomic absorption spectrometry
  • Nano-hydroxyapatite composites
  • Preconcentration
  • Solid phase extraction

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