Abstract In this work, some common and inexpensive biomass waste were used as carbon sources including orange peel, ginkgo biloba leaves, paulownia leaves and magnolia flower to prepare biomass carbon quantum dots (CQDs) by using a facile hydrothermal process. These biomass CQDs exhibited the advantages of homogeneous particle size, superior water solubility and stability, similar optical properties and surface functional group. The fluorescence quenching effect was observed when Fe3+ ions were added into CQDs solution. The experiment results showed that the as-prepared CQDs have a sensitive response to Fe3+ ions in the concentration range of 0.2−100 μM, and the limit of detection (LOD) could as low as 0.073 μM. More importantly, practical applications for the detection Fe3+ ions in pond water acquired satisfactory recoveries (94 %–108 %). Therefore, this work not only provided a new way for reusages of biomass waste, but also provided a novel alternative sensor for Fe3+ ions detection in real-world.

中文翻译：

---

从生物质废物中轻松合成新型碳量子点，用于铁离子的高灵敏度检测

摘要 本研究以橙皮、银杏叶、泡桐叶和玉兰花等常见且廉价的生物质废弃物为碳源，采用简便的水热法制备生物质碳量子点（CQDs）。这些生物质碳量子点具有粒径均匀、水溶性和稳定性优异、光学性质和表面官能团相似等优点。在 CQDs 溶液中加入 Fe3+ 离子，观察到荧光猝灭效应。实验结果表明，所制备的 CQDs 对 0.2-100 μM 浓度范围内的 Fe3+ 离子具有灵敏响应，检测限 (LOD) 可低至 0.073 μM。更重要的是，检测池塘水中 Fe3+ 离子的实际应用获得了令人满意的回收率 (94%–108%)。