Scholarlink

<p>This study successfully synthesized a novel ternary nanocomposites (NCs) consisting of poly-O-toluidine-chitosan-decorated ZnFe₂O₄ (P(OT)/CS/ZnF) using an in situ chemical oxidation technique for the ultra-sensitive detection of lead ions. The NCs was thoroughly evaluated utilizing FTIR, XRD, TEM, SEM–EDX, N₂ adsorption–desorption isotherm, and TGA studies. XRD data validated excellent crystallinity in all samples, whilst SEM and TEM investigations demonstrated a distinctive core–shell-shell structure with ZnF NPs encapsulated in chitosan and enveloped by a P(OT) shell. The surface area assessment revealed a consistent decline from pure P(OT) (53.2849 m<sup>2</sup>/g) to the ternary composite (42.4071 m<sup>2</sup>/g), signifying effective component integration. The QCM sensor utilizing P(OT)/CS/ZnF NCs exhibited outstanding sensitivity to Pb<sup>2</sup>⁺, achieving an exceptionally low detection limit of 0.05 ppb, well beneath the WHO guideline threshold. The sensor demonstrated exceptional selectivity towards prevalent interfering ions, showing minimal reactions to Cu<sup>2</sup>⁺, Cd<sup>2</sup>⁺, Zn<sup>2</sup>⁺, and Ni<sup>2</sup>⁺ at concentrations ten times greater. The sensor demonstrated exceptional stability (95% retention after 30 days), repeatability (RSD 3.2%), and reusability (&gt; 95% response after 10 cycles). Analysis of real samples in several water matrices produced outstanding recovery rates (96.5–102.3%), illustrating the sensor's practical utility for environmental monitoring.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-sensitivity QCM Sensor Based on O-Toluidine-Chitosan-Decorated ZnFe₂O₄ Nanoparticles for Ultra-trace Pb2⁺ Detection in Aqueous Media

  • 期刊论文

  • 发表日期：

    2025年6月3日

查看全文
  • Dina F. Katowah,
  • Sameh H. Ismail

摘要

This study successfully synthesized a novel ternary nanocomposites (NCs) consisting of poly-O-toluidine-chitosan-decorated ZnFe₂O₄ (P(OT)/CS/ZnF) using an in situ chemical oxidation technique for the ultra-sensitive detection of lead ions. The NCs was thoroughly evaluated utilizing FTIR, XRD, TEM, SEM–EDX, N₂ adsorption–desorption isotherm, and TGA studies. XRD data validated excellent crystallinity in all samples, whilst SEM and TEM investigations demonstrated a distinctive core–shell-shell structure with ZnF NPs encapsulated in chitosan and enveloped by a P(OT) shell. The surface area assessment revealed a consistent decline from pure P(OT) (53.2849 m2/g) to the ternary composite (42.4071 m2/g), signifying effective component integration. The QCM sensor utilizing P(OT)/CS/ZnF NCs exhibited outstanding sensitivity to Pb2⁺, achieving an exceptionally low detection limit of 0.05 ppb, well beneath the WHO guideline threshold. The sensor demonstrated exceptional selectivity towards prevalent interfering ions, showing minimal reactions to Cu2⁺, Cd2⁺, Zn2⁺, and Ni2⁺ at concentrations ten times greater. The sensor demonstrated exceptional stability (95% retention after 30 days), repeatability (RSD 3.2%), and reusability (> 95% response after 10 cycles). Analysis of real samples in several water matrices produced outstanding recovery rates (96.5–102.3%), illustrating the sensor's practical utility for environmental monitoring.

Graphical abstract