College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China.
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China.
Int J Biol Macromol. 2020 Nov 15;163:593-602. doi: 10.1016/j.ijbiomac.2020.07.018. Epub 2020 Jul 6.
A novel cellulose-based colorimetric sensor (DAC-Tu) with N, S sites for Ag was prepared. The DAC-Tu exhibited excellent selectivity and sensitivity for Ag with a naked eyes color change from white to black in mixed metal ions aqueous solutions. The naked-eye in-situ detection limit of DAC-Tu for Ag was 10 mol/L within 10 min. The cellulose matrix and the grafted functional groups (CS, NH) of DAC-Tu all contributed to the low naked-eye in-situ detection limit. The mechanism of the visual recognition of DAC-Tu sensor for Ag was proposed, the N and S atoms of DAC-Tu preferentially coordination chelated with Ag to form NAg, SAg, and AgS, and enriched on the cellulose matrix, thus the DAC-Tu presented different color change in response to different concentrations of Ag. The as-prepared DAC-Tu colorimetric sensor showed a great application prospect for in-situ naked eyes detection of Ag.
一种新型的基于纤维素的比色传感器（DAC-Tu），具有用于 Ag 的 N、S 配位位点，被制备出来。在混合金属离子水溶液中，DAC-Tu 对 Ag 表现出优异的选择性和灵敏度，通过肉眼观察，颜色从白色变为黑色。在 10 分钟内，DAC-Tu 对 Ag 的肉眼原位检测限低至 10 摩尔/升。纤维素基质和 DAC-Tu 接枝的官能团（CS、NH）都有助于降低肉眼原位检测限。提出了 DAC-Tu 传感器对 Ag 的可视化识别机制，DAC-Tu 的 N 和 S 原子优先与 Ag 配位螯合，形成 NAg、SAg 和 AgS，并在纤维素基质上富集，从而 DAC-Tu 对不同浓度的 Ag 呈现出不同的颜色变化。所制备的 DAC-Tu 比色传感器在 Ag 的原位肉眼检测方面具有广阔的应用前景。
