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

• Published in: Materials today advances 2022-08, Vol.15, p.100268, Article 100268
• Main Authors: Zhan, Meihong, Gao, Weimin, Nguyen, William, Yu, Hongmei, Amador, Eric, Chen, Wei
• Format: Article
• Language: English
• Subjects: Cr (VI); Flame atomic absorption spectrometry; Nano-hydroxyapatite composites; Preconcentration; Solid phase extraction
• ISSN: 2590-0498; 2590-0498
• DOI: 10.1016/j.mtadv.2022.100268

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%. [Display omitted] •Triadic silica polyhexamethylene hydroxyapatite nanocomposites are constructed by self-assembly.•Nano-HAP composites were employed in a micro-column system for solid phase extraction of Cr (VI).•Nano-HAP composites can efficiently adsorb Cr (VI) at pH 4.0–6.0, but absorb almost no Cr (III).•The detection limit of the method is more sensitive than reported in literature using similar methods.