云杉碳点的制备及其在甲醛检测中的应用

Preparation of Carbon Dots from Spruce Wood and Its Application in Detection of Formaldehyde

中文关键词:  废弃云杉木包装  水热法  碳点  甲醛检测

英文关键词:waste spruce wood packaging  hydrothermal method  carbon dots  detection of formaldehyde

中文摘要:

      目的 为云杉木包装箱废弃物的二次利用提供新的途径。方法 将废弃的云杉木包装作为碳源，采用高温高压水热法，在180 ℃下反应10 h，制得云杉碳点(Spruce carbon dots，S−CDs)，并将其应用于甲醛检测。通过透射电镜(HRTEM)、原子力显微镜(AFM)、X射线衍射仪(XRD)等仪器对S−CDs的形貌、晶型结构、化学组成和光学性能进行表征。结果 S−CDs呈类球状，平均粒径为3.49 nm，量子产率为0.45%，其表面含有C—O、C=O、N—H等基团，水溶性较好，在365 nm紫外灯下会发出蓝色的荧光。采用比值荧光法将S−CDs应用于甲醛检测，S−CDs对甲醛表现出较好的响应性，在甲醛浓度为0~1 mmol/L内，其溶液的荧光强度F427/F490与甲醛浓度之间呈现良好的线性关系(R²=0.968)，检出极限值(LOD)达到0.045 mmol/L。结论 以云杉废弃木包装为单一碳源，成功地制备出可应用于甲醛检测的S−CDs，实现了废弃云杉木包装的二次利用和功能化。

英文摘要:

      The work aims to provide a new way for the secondary utilization of waste spruce wood packaging. Waste spruce wood packaging was used as carbon source. Then, spruce carbon dots (S-CDs) were derived from carbon source by the hydrothermal method (180 ℃, 10 h) and applied to detection of formaldehyde. High-resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM) X-ray diffraction (XRD) and other instruments were used to investigate the morphology, crystallinity, chemical composition and optical properties of the S-CDs. In brief, S-CDs were spheroid with an average particle size of 3.49 nm, and the quantum yield was 0.45%. The surface contained C—O, C=O, N—H and other groups, which could be evenly dispersed in water. S-CDs were fluorescent blue excited at 365 nm. In addition, ratio fluorescence method was used to apply S-CDs in detection of formaldehyde. S-CDs showed a good response to formaldehyde. In the range of 0-1 mmol/L, the values of F427/F490 showed a good linear relationship with formaldehyde concentration (R2=0.968). The detection limit (LOD) was 0.045 mmol/L. Waste spruce wood packaging can be used as a single carbon source to prepare S-CDs which can be used for formaldehyde detection, thus realizing the secondary utilization and functionalization of waste spruce wood packaging.