Recycling is a fascinating topic in academia due to the environmental and economic benefits in industries. In this paper, we report on the method to recycle cellulose waste papers using a green (eco-friendly) approach based on ionic liquids (ILs) where the regenerated cellulose was converted to carbon dots (CDs). The addition of waste papers to the IL, 1-allyl-3-methylimidazolium chloride ([Amim][Cl]), disrupted the chemical arrangement of cellulose and completely dissolved the waste paper under microwave irradiation. Subsequent cellulose regeneration by an additional antisolvent, absolute ethanol, was carried out to recover IL and obtain cellulosic materials’ units from waste papers. Furthermore, we report a practical strategy to fabricate CDs under microwave-assisted irradiation. The CDs made by the regenerated cellulose (RC-CDs) were characterized by using analytical and spectroscopic techniques, such as transmission electron microscopy (TEM) and X-ray diffraction (XRD). Finally, we confirmed that RC-CDs exhibited low cytotoxicity, which suggests RC-CDs acts as a promising fluorescent probe for bioimaging.

中文翻译：

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在回收过程中将废纸转换为荧光碳点，而不会损失离子液体和生物成像应用

由于行业的环境和经济利益，回收在学术界是一个引人入胜的话题。在本文中，我们报告了一种基于离子液体（ILs）的绿色（生态友好型）方法来回收纤维素废纸的方法，其中再生纤维素被转化为碳点（CD）。将废纸添加到IL 1-烯丙基3-甲基咪唑鎓氯化物（[Amim] [Cl]）中会破坏纤维素的化学排列，并在微波辐射下将废纸完全溶解。随后用另一种抗溶剂无水乙醇进行纤维素再生，以回收白介素并从废纸中获得纤维素材料的单位。此外，我们报告了一种在微波辅助辐射下制造CD的实用策略。通过使用分析和光谱技术，例如透射电子显微镜（TEM）和X射线衍射（XRD），对由再生纤维素制成的CD（RC-CD）进行表征。最后，我们确认RC-CD表现出低细胞毒性，这表明RC-CD可以用作生物成像的有前途的荧光探针。