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Selective Naked-eyes Chemosensing of Cu2+ ions using Chitosan-CdS Quantum Dots Biohybrid

2022 11 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 35 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Hani Nasser Abdelhamid, Faisal K. Algethami, Faisal K. Algethami, Ilyes Saidi, Hichem Ben Jannet, Hani Nasser Abdelhamid, M. Khaіry, Babiker Y. Abdulkhair, Youssef O. Al‐Ghamdi, Youssef O. Al‐Ghamdi

Summary

Researchers synthesized cadmium sulfide quantum dots embedded in chitosan (CdS/CTS) via an in-situ solvothermal method, producing uniformly distributed 1-7 nm QDs (average 3.2 nm), and characterized the hybrid material using XRD, XPS, TEM, FT-IR, and spectroscopic methods. They demonstrated that CdS/CTS enables selective naked-eye colorimetric detection of Cu2+ ions from heavy metal mixtures, with chitosan functional groups preventing QD agglomeration and modulating selectivity.

Cadmium sulfide (CdS) quantum dots (QDs) were homogeneously embedded into chitosan (CTS), denoted as CdS/CTS, via an in-situ solvothermal method. The intact structure of the synthesized materials was preserved via separating the materials using freeze-drying. The materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), high-resolution TEM (HR-TEM), scanning TEM (STEM), dispersive energy X-ray (EDX) for elemental analysis and mapping, Fourier transform infrared (FT-IR), nitrogen adsorp-tion-desorption isotherms, thermogravimetric analysis, UV-Vis spectroscopy, and diffuse reflectance spectroscopy (DRS). The synthesis procedure offered CdS QDs with 1-7 nm (average particle size of 3.2 nm). The functional groups of CTS modulate the in-situ growth of CdS QDs and prevent the agglomeration of CdS QDs, offering homogenous distribution inside CTS. CdS/CTS QDs can also be used for naked-eye detection of heavy metals with high selectivity toward copper (Cu2+) ions. The mechanism of interactions between Cu2+ ions and CdS/CTS QDs was further studied

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