Qiao Xiaolong, Wang Shixing, Liu Qiulian, Zhang Yuanming, Han Guangting, Ben Haoxi, Jiang Wei, Zhao Haiguang, Song Yan
College of Textile and Clothing, Dezhou University, Dezhou 253026, China.
State Key Laboratory of Bio-Fibers and Eco-Textiles, College of Textiles and Clothing, Qingdao University, Qingdao 266071, China.
Nanomaterials (Basel). 2024 Nov 23;14(23):1887. doi: 10.3390/nano14231887.
China is the country with the most abundant bamboo resources in the world. Using bamboo as a raw material for pulping and papermaking can save a lot of wood and protect forests. Bamboo pulping enterprises mostly adopt sulfate processes to produce a large amount of black liquor (BL), which contains monosaccharides, polysaccharides, oligosaccharides, pectin, lignin, etc. The utilization of the high-value organic matter is of great economic and environmental significance. In this study, blue-green carbon dots (C-dots) were prepared from bamboo () kraft pulp BL using a hydrothermal method. The changes in carbohydrate content in BL in relation to hydrothermal temperature and hydrothermal time were discussed in detail. Then, a series of characterizations of BL-C-dots, prepared under one of the hydrothermal conditions (180 °C, 6 h), were performed and the BL-C-dots showed an excitation-dependent photoluminescence (PL) spectrum and a quantum yield (QY) of 2.9% in an aqueous solution. Finally, the as-prepared BL-C-dots were successfully used as fluorescent materials to develop an anti-counterfeiting code. The fluorescent code exhibited a clear outline, an excitation-tunable color, good stability, and high security, showing great anti-counterfeiting potential and realizing the high-value utilization of BL.
中国是世界上竹资源最为丰富的国家。以竹子为制浆造纸原料可节省大量木材并保护森林。竹浆企业大多采用硫酸盐法生产大量黑液，黑液中含有单糖、多糖、寡糖、果胶、木质素等。对其中高价值有机物的利用具有重大的经济和环境意义。本研究采用水热法从竹子硫酸盐法蒸煮黑液中制备了蓝绿色碳点。详细探讨了黑液中碳水化合物含量随水热温度和水热时间的变化。然后，对在其中一种水热条件（180℃，6小时）下制备的黑液碳点进行了一系列表征，该黑液碳点在水溶液中呈现出激发依赖的光致发光（PL）光谱，量子产率（QY）为2.9%。最后，将所制备的黑液碳点成功用作荧光材料开发了一种防伪码。该荧光码轮廓清晰、颜色可激发调节、稳定性好且安全性高，展现出巨大的防伪潜力，实现了黑液的高价值利用。
