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

作　　者：李影 刘凯 胡妙言 徐丽 张榅清 徐长妍 LI Ying;LIU Kai;HU Miao-yan;XU Li;ZHANG Wen-qing;XU Chang-yan(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学材料科学与工程学院,南京210037

出　　处：《包装工程》2022年第17期11-19,共9页Packaging Engineering

基　　金：国家自然科学基金(32071703);教育部青年人文社会科学研究基金(19YJC760132)。

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3.49nm,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365nm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0~1mmol/L内,其溶液的荧光强度F_(427)/F_(490)与甲醛浓度之间呈现良好的线性关系(R^(2)=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。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 F_(427)/F_(490) showed a good linear relationship with formaldehyde concentration(R^(2)=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.

关 键 词：废弃云杉木包装 水热法 碳点 甲醛检测 

分 类 号：TQ127.1[化学工程—无机化工]