基于废弃火炬松木包装的碳量子点制备与性能

Preparation and Properties of Carbon Quantum Dots Based on Waste Loblolly Pine Wood Packaging

中文关键词: 废弃火炬松木材包装  碳量子点  氮磷掺杂

英文关键词: waste Loblolly Pine wood packaging  carbon quantum dots  N-P doping

中文摘要:

      目的 为了改善废弃火炬松木材包装综合利用率低和功能化利用严重不足的现状，以其包装废弃物制备荧光碳量子点，实现高附加值利用。方法 首先，以废弃火炬松木材包装为碳源，以尿素和磷酸分别为氮、磷掺杂剂，采用水热法(温度为200 ℃、时间为12 h)，制备氮磷掺杂碳量子点。接着，采用紫外可见光分光光度计、荧光分光光度计、透射电子显微镜、傅里叶红外光谱和X射线光电子能谱表征CQDs的物理结构、化学结构和光学性质，筛选出荧光强度高、荧光量子产率大的制备工艺。结果 所制备的氮磷掺杂火炬松荧光碳量子点呈规则的球形，其平均粒径为2.25 nm、粒径分布范围为1.3~3.4 nm，且在水溶液中分布均匀，无明显聚集;碳量子点表面具有丰富的醚键、碳碳双键以及含磷和含氮官能团;当火炬松木粉、去离子水、尿素、磷酸的质量比为1∶60∶0.5∶0.5时，所得荧光碳量子点的荧光最强、荧光量子产率最高，所得荧光量子产率比未掺杂碳量子点的提高了5.54倍。结论 以废弃火炬松木材包装为碳源制备荧光碳量子点的策略是可行的，可为火炬松木材包装废弃物的高值化和功能化利用提供了一条新的途径。

英文摘要:

      The work aims to prepare carbon quantum dots based on waste Loblolly Pine wood packaging to improve the current situation of low comprehensive utilization rate and insufficient functional utilization of waste Loblolly Pine wood packaging, thus realizing high value-added utilization. With waste Loblolly Pine wood packaging as carbon source and urea and phosphoric acid as nitrogen and phosphoric dopants, N-P doped carbon quantum dots were prepared by hydrothermal method at 200 ℃ for 12 h. Then, the physical structure, chemical structure and optical properties of CQDs were characterized by UV-vis spectrophotometer, fluorescence spectrophotometer, transmission electron microscope, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy and the preparation technology realizing high fluorescence intensity and high fluorescence quantum yield was selected. The N-P doped Loblolly Pine CQDs were regular spherical with average particle size of 2.25 nm and particle size distribution of 1.3~3.4 nm. The N-P doped CQDs were uniformly distributed in aqueous solution without obvious aggregation, andwith surface rich in ether bonds, carbon-carbon double bonds, phosphorous and nitrogenous functional groups. When the ratio of Loblolly Pine wood powder:deionized water:urea:phosphoric acid was 1:60:0.5:0.5 (mass ratio), both fluorescence strength and fluorescence quantum yield of the N-P doped Loblolly Pine CQDs were the highest. The fluorescence quantum yield of the N-P doped Loblolly Pine CQDs was 5.54 times higher than that of CQDs without nitrogen and phosphoric acid. It is feasible to prepare fluorescent carbon quantum dots from waste Loblolly Pine wood packaging as carbon source, which provides a new way for high-value and functional utilization of waste wood packaging.