Abstract
The present study was conducted to determine manganese (Mn2+) and chromium (Cr2+) ions in aqueous systems with a simple, rapid, sensitive, selective, and cost-effective colorimetric approach. Sodium dodecyl sulfonate (SDS) and β-cyclodextrin (CD) were used as both stabilizer and surface functionalizing agents for the synthesis of silver nanoparticles (AgNPs). Synthesized AgNPs were characterized by FT-IR spectroscopy, UV-visible spectroscopy, scanning electron microscopy (SEM), and dynamic light scattering (DLS) techniques. The effect of pH on the stability of nanoparticles was investigated. SDS modified silver nanoparticles (SDS-AgNPs) and SDS with β-cyclodextrin modified silver nanoparticles (SDS-CD-AgNPs) demonstrated sensitive and selective colorimetric detection of Mn2+ and Cr2+ ions at ppm level, respectively. The prepared SDS-AgNPs and SDS-CD-AgNPs solution showed a color change visible to the naked eye from yellow to orange upon adding Mn2+ and Cr2+ ions, respectively; however, other metal ions did not induce such a change. In addition, the results of SEM and DLS for both sensors showed the aggregation of nanoparticles after adding Mn2+ or Cr2+. Overall, the results of this study show the successful synthesis of AgNPs, SDS-AgNPs, and SDS-CD-AgNPs as simple, rapid, sensitive, selective colorimetric sensors with high potential for rapid and on-site detection of Mn2+ and Cr2+ ions.
Highlights
Manganese (Mn) and Chromium (Cr) are essential trace elements for many life processes of the human body such as enzyme activity, bone growth, and fat metabolism.[1,2] excessive levels of these elements in biological activities can be toxic for health and may lead to fatal diseases.[3,4] Essential quality standards for Mn (0.05 mg/L) and Cr (0.1 mg/L) have been adopted at the EU level.[5,6] the determination of these ions has become inevitable for remedial processes
The synthesized agents for the synthesis of silver nanoparticles (AgNPs) were characterized by UV-visible spectroscopy, FT-IR spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), TEM, X-ray diffraction (XRD) and dynamic light scattering (DLS) techniques
It can be stated that the diffusion of silver ions into the primary seed coated with Sodium dodecyl sulfonate (SDS) is more difficult than penetration of silver ions into the primary seed coated with SDS-CD
Summary
Manganese (Mn) and Chromium (Cr) are essential trace elements for many life processes of the human body such as enzyme activity, bone growth, and fat metabolism.[1,2] excessive levels of these elements in biological activities can be toxic for health and may lead to fatal diseases.[3,4] Essential quality standards for Mn (0.05 mg/L) and Cr (0.1 mg/L) have been adopted at the EU level.[5,6] the determination of these ions has become inevitable for remedial processes. Many efforts have been done to detect Mn and Cr ions with high selectivity and sensitivity
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