College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, PR China.
Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, PR China.
Int J Biol Macromol. 2023 Jul 1;242(Pt 2):124958. doi: 10.1016/j.ijbiomac.2023.124958. Epub 2023 May 20.
Lignin in black liquor can be used to manufacture carbon nanomaterials on a large scale. However, the effect of nitrogen doping on the physicochemical properties and photocatalytic performance of carbon quantum dots (NCQDs) remains to be explored. In this study, NCQDs with different properties were prepared hydrothermally by using kraft lignin as the raw material and EDA as a nitrogen dopant. The amount of EDA added affects the carbonization reaction and surface state of NCQDs. Raman spectroscopy showed that the surface defects increased from 0.74 to 0.84. Photoluminescence spectroscopy (PL) showed that NCQDs had different intensities of fluorescence emission at 300-420 nm and 600-900 nm. Meanwhile, NCQDs can photo-catalytically degrade 96 % of MB under simulated sunlight irradiation within 300 min. After three months of storage, the fluorescence intensity of NCQDs remained above 94 %, showing remarkable fluorescence stability. After four times of recycling, the photo-degradation rate of NCQDs was maintained above 90 %, confirming its outstanding stability. As a result, a clear understanding of the design of carbon-based photo-catalyst fabricated from the waste of the paper-making industry has been gained.
黑液中的木质素可以大规模用于制造碳纳米材料。然而，氮掺杂对碳量子点（NCQDs）的物理化学性质和光催化性能的影响仍有待探索。在这项研究中，以牛皮纸浆木质素为原料，乙二胺（EDA）为氮掺杂剂，通过水热法制备了具有不同性质的 NCQDs。添加的 EDA 量影响 NCQDs 的碳化反应和表面状态。拉曼光谱表明，表面缺陷从 0.74 增加到 0.84。荧光光谱（PL）表明，NCQDs 在 300-420nm 和 600-900nm 处具有不同强度的荧光发射。同时，NCQDs 在模拟太阳光照射下 300min 内可光催化降解 96%的 MB。储存三个月后，NCQDs 的荧光强度仍保持在 94%以上，显示出优异的荧光稳定性。经过四次循环后，NCQDs 的光降解率仍保持在 90%以上，证明其稳定性突出。因此，对利用造纸工业废弃物设计的碳基光催化剂有了更清晰的认识。
