微波制备的量子点及其作为吸附剂和化学传感器的潜在应用。
Microwave-Prepared Quantum Dots and Their Potential Applications as Adsorbents and Chemosensors.
作者信息
Tohamy Hebat-Allah S, El-Sakhawy Mohamed, Hassan El Barbary, Kamel Samir
机构信息
Cellulose and Paper Department, National Research Centre, 33 El Bohouth Str., Dokki, Giza 12622, Egypt.
Department of Sustainable Bioproducts, Mississippi State University, P.O. Box 9820, Mississippi State, MS 39762, USA.
出版信息
Materials (Basel). 2023 Oct 17;16(20):6722. doi: 10.3390/ma16206722.
A combination of different eco-friendly materials prepared promising fluorescent quantum dots (QDs) through the one-step process using the microwave heating of urea with cellulose, chitosan, and biochar. Characterizations of the prepared QDs, including the investigation of their structure by infrared spectroscopy, Raman analysis, X-ray diffraction, thermal gravimetric analysis, morphology, and optical properties, were performed. The results showed that QDs possess a small size, high UV absorption, and excitation wavelength-dependent fluorescence. The prepared QDs were also tested for metal ions removal from aqueous solutions. The adsorption at different contact times was investigated to optimize the adsorption efficiency of the prepared QDs. All QDs were found to be an ideal sorbent for Cr(II), Cu(II), Mn(II), and Pb(II). From the data, Cr(II) was more highly adsorbed than other metal ions. The results of the kinetic investigation showed that the pseudo-second-order kinetic model fit the adsorption process effectively. In addition, the fluorescence spectra of QDs were changed after the adsorption of metal ions; hence, the prepared QDs could be utilized in environmental sectors such as wastewater pollution detection, adsorption, and chemical sensing applications.
通过使用尿素与纤维素、壳聚糖和生物炭进行微波加热的一步法，将不同的环保材料组合制备出了有前景的荧光量子点（QDs）。对制备的量子点进行了表征，包括通过红外光谱、拉曼分析、X射线衍射、热重分析、形态学和光学性质对其结构进行研究。结果表明，量子点具有小尺寸、高紫外线吸收以及与激发波长相关的荧光特性。还对制备的量子点进行了从水溶液中去除金属离子的测试。研究了不同接触时间下的吸附情况，以优化制备的量子点的吸附效率。发现所有量子点都是Cr(II)、Cu(II)、Mn(II)和Pb(II)的理想吸附剂。从数据来看，Cr(II)的吸附量比其他金属离子更高。动力学研究结果表明，准二级动力学模型能有效拟合吸附过程。此外，金属离子吸附后量子点的荧光光谱发生了变化；因此，制备的量子点可用于废水污染检测、吸附和化学传感应用等环境领域。
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