Xing Dan, Koubaa Ahmed, Tao Yubo, Magdouli Sara, Li Peng, Bouafif Hassine, Zhang Jingfa
Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC J9X 5E4, Canada.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Polymers (Basel). 2022 Dec 28;15(1):136. doi: 10.3390/polym15010136.
An ecofriendly approach was developed for preparing copper-doped carbon dots (CDs) with superior photocatalysis using chromium-copper-arsenic (CCA)-treated wood waste as a precursor. Original wood (W-CDs), CCA-treated wood (C-CDs), and bioremediation CCA wood (Y-CDs) were used as the precursors. The chemical composition and structural, morphological, and optical properties, as well as the photocatalytic ability of the synthesized CDs varied with wood type. The C-CDs and W-CDs had similar characteristics: quasispherical in shape and with a diameter of 2 to 4.5 nm. However, the Y-CDs particles were irregular and stacked together, with a size of 1.5-3 nm. The presence of nitrogen prevented the formation of an aromatic structure for those CDs fabricated from bioremediation CCA wood. The three synthesized CDs showed a broad absorption peak at 260 nm and a weak absorption peak at 320 nm. Proof of the model study for the fabrication of luminescent CDs from CCA wood waste for bioimaging was provided. The degradation rate of CD photocatalytic MB was 97.8% for 30 min. Copper doping gives the CDs electron acceptor properties, improving their photocatalytic efficiency. This study provides novel ways to prepare nanomaterials from decommissioned wood as a nontoxic and low-cost alternative to fluorescent dots.
开发了一种环保方法，以经铬-铜-砷（CCA）处理的木材废料为前驱体制备具有优异光催化性能的铜掺杂碳点（CDs）。使用原始木材（W-CDs）、经CCA处理的木材（C-CDs）和生物修复后的CCA木材（Y-CDs）作为前驱体。合成的CDs的化学成分、结构、形态和光学性质以及光催化能力随木材类型而变化。C-CDs和W-CDs具有相似的特征：形状为准球形，直径为2至4.5纳米。然而，Y-CDs颗粒不规则且堆叠在一起，尺寸为1.5 - 3纳米。氮的存在阻止了由生物修复后的CCA木材制备的那些CDs形成芳香结构。三种合成的CDs在260纳米处显示出宽吸收峰，在320纳米处显示出弱吸收峰。提供了以CCA木材废料制备用于生物成像的发光CDs的模型研究证据。CDs光催化亚甲基蓝（MB）的降解率在30分钟内为97.8%。铜掺杂赋予CDs电子受体特性，提高了它们的光催化效率。本研究提供了从退役木材制备纳米材料的新方法，作为荧光点的无毒且低成本替代品。
