Liaoning Key Laboratory of Pulp and Paper Engineering, Dalian Polytechnic University, 1#Ganjingzi District, Dalian 116034, China.
Liaoning Key Laboratory of Pulp and Paper Engineering, Dalian Polytechnic University, 1#Ganjingzi District, Dalian 116034, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Int J Biol Macromol. 2020 Dec 1;164:4289-4298. doi: 10.1016/j.ijbiomac.2020.08.243. Epub 2020 Sep 3.
As one type of the solid wastes, the increasing contamination of waste cellulose diacetate (CDA) from discarded cigarette filters is a growing problem worldwide. Finding a facile and suitable approach to convert the CDA into value-added materials is of significance. Herein, we reported a green, simple and effective method to reuse CDA as precursor for preparing fluorescence N-doped carbon dots (N-CDs) via one-pot hydrothermal carbonization in aqueous solution with low-cost ammonium hydroxide as the passivation agent. The N-CDs showed a quantum yield up to 22.4% with a maximum emission at 415 nm and excitation at 320 nm. Interestingly, the N-CDs exhibited high selectivity toward tetracycline (TC) as their fluorescence was obviously quenched by TC as a result of inner-filter effect. A linear relationship was fabricated over concentration range of 0-80 μM with a detection limit of 0.06 μM. Moreover, the N-CDs could also be applied as fluorescent ink for anti-forgery.
作为一种固体废物，废弃香烟过滤嘴中不断增加的醋酸纤维素（CDA）污染是一个全球性的日益严重的问题。寻找一种简便、合适的方法将 CDA 转化为增值材料具有重要意义。在此，我们报道了一种绿色、简单、有效的方法，通过在水溶液中一步水热碳化，以廉价的氨水作为钝化剂，将 CDA 再利用为制备荧光 N 掺杂碳点（N-CDs）的前体。N-CDs 的量子产率高达 22.4%，最大发射波长为 415nm，最大激发波长为 320nm。有趣的是，N-CDs 对四环素（TC）表现出高选择性，因为由于内滤效应，TC 明显猝灭了它们的荧光。在 0-80 μM 的浓度范围内建立了线性关系，检测限为 0.06 μM。此外，N-CDs 还可以用作防伪荧光油墨。
