文献类型：期刊文献

中文题名：三嗪化木碳点赋能木纹无损可视紫外屏蔽耐光PVA膜

英文题名：Triazine wood-derived carbon dots deliver photostable PVA films with visible wood grain and UV shielding

作者：宋纪元[1,2] 吕少一[2] 张龙飞[2] 周兆兵[1] 彭立民[2]

第一作者：宋纪元

机构：[1]南京林业大学材料科学与工程学院,江苏南京210037;[2]中国林业科学研究院木材工业研究所,北京100091

年份：2025

卷号：47

期号：12

起止页码：159-169

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：;北大核心:【北大核心2023】；

基金：中国林业科学研究院“青年英才工程”优秀青年创新人才培育计划(CAFYBB2023QA005)。

语种：中文

中文关键词：木材衍生碳点(W-CDs);三嗪功能化碳点;PVA基复合薄膜;高效紫外线屏蔽;可见光高透过率;光谱选择性;耐光色牢度;光老化稳定性

外文关键词：wood-derived carbon dots(W-CDs);triazine-functionalized CDs;PVA-based composite film;high-efficiency UV shielding;high visible-light transmittance;spectral selectivity;lightfastness;photostability

分类号：TQ127.1;TB34;TQ317

摘要：【目的】紫外光(200~400 nm)辐照下,木材表面木质素及抽提物降解生成醌类发色基团,导致不可逆的变色反应与力学性能劣化,此问题已成为制约木材高端化应用的瓶颈。现行防护策略常以牺牲木纹美感为代价,或因分散性差、透明性不足而难以兼顾审美与长效屏蔽,亟需开发“高紫外屏蔽?高可见透明”的一体化新材料。为此,本研究提出以三嗪功能化木源碳点(CDs)为核心构建聚乙烯醇(PVA)复合薄膜,旨在保持木材天然纹理的同时,提升其耐光变色的稳定性。【方法】以富含萜类抽提物、耐腐抗虫的速生杉木粉为碳源,150℃水热预抽提富集碳水化合物后,加富氮三肼三嗪(THT)为表面修饰剂,高温水热碳化制得THT-CDs;再与PVA共混,流延成PVA@THT-CDs复合薄膜。TEM、FTIR、XPS、XRD、荧光光谱和UV-Vis分光光度计联合表征THT-CDs的形貌、化学结构及光学性能,并量化复合薄膜的紫外屏蔽效率,以无机ZnO和有机UV-384涂层为参照。随后,将薄膜覆于薄木表面,在高功率紫外灯下加速老化,定期测定CIE Lab色度参数,评估其抑色性能。借助光纤光谱仪采集薄膜在370 nm单波长及模拟日光下的透射光谱,对比两束光透过后的谱图差异,解析木材表面的光传输行为及黄变机制。【结果】THT-CDs呈类石墨球形,平均粒径5.53 nm,在水中分散性优异;在372 nm激发下,THT-CDs发出445 nm明亮蓝光,荧光量子产率达21.4%,显示出高效的光致发光性能。当添加量仅为2%时,PVA@THT-CDs复合薄膜可屏蔽90.3%以上的紫外光,380 nm与400 nm处透过率分别降至0.3%和9.7%,而800 nm可见光透过率仍保持82.4%,其紫外?可见选择性分离效率显著优于ZnO和UV-384对照膜。CIE色度轨迹进一步证实,该复合薄膜在加速紫外老化过程中能有效抑制基材色差增大,展现出卓越的光学稳定性。【结论】本研究通过三嗪功能化木材衍生碳点,成功解决了传统材料的紫外吸收弱、屏蔽效率低、透明性不足的技术瓶颈;借助THTCDs的广谱紫外吸收?可见光转换机制,实现了“高紫外屏蔽与高透明”的协同效应,在木材表面构筑了一层透明、长效且保留天然木纹的耐光老化薄膜。该策略不仅突破了传统屏蔽材料透明性不足的局限,也为速生杉木的高值化利用开辟了新路径,对推动木质家居、展陈制品及室外景观材的绿色升级具有现实可行性。
[Purpose]UV light(200?400 nm)converts wood lignin and extractives into quinone chromophores,causing irreversible discoloration and strength loss that limit high-end applications.Existing coatings either hide the grain or lack transparency and long-term UV protection.Here,we report a transparent poly(vinyl alcohol)(PVA)film armed with triazine-functionalized wood-derived carbon dots(CDs)that blocks UV while keeping the natural texture visible.[Method]Fast-growing,terpene-rich and decay-resistant Cunninghamia lanceolata sawdust was used as the carbon source.After pre-extraction at 150℃to enrich carbohydrates,nitrogen-rich triaminotriazine(THT)was added as a surface modifier and the mixture was subjected to high-temperature hydrothermal carbonization to yield THT-CDs.The dots were then blended with PVA and cast into PVA@THT-CDs composite films.TEM,FTIR,XPS,XRD,fluorescence and UV-Vis spectroscopy were combined to image the morphology,chemistry and optical response of THT-CDs,and to quantify the UV-shielding efficiency of the composite film,using inorganic ZnO and organic UV-384 coatings as comparison.The film was laid over veneer and aged under high-power UV light.CIE Lab*values were recorded at intervals to rate color suppression.A fiber-optic spectrometer collected the transmission spectra of the film under 370 nm monochromatic light and simulated solar irradiation;comparison of the two spectra revealed the light-transport behavior at the wood surface and the mechanism of UV-induced yellowing.[Results]THT-CDs exhibit a graphitic spherical morphology with an average diameter of 5.53 nm and excellent dispersibility in water.Upon excitation at 372 nm,they emit bright blue light at 445 nm with a photoluminescence quantum yield of 21.4%,indicating highly efficient light emission.When incorporated at only 2 wt%,the PVA@THT-CDs composite film blocks over 90.3%of UV radiation;transmittance drops to 0.3%at 380 nm and 9.7%at 400 nm,while 82.4%of visible light at 800 nm is still transmitted.This UV-vis selective separation efficiency is markedly superior to that of ZnO and UV-384 reference coatings.CIE color trajectory analysis further confirms that the composite film effectively suppresses color change of the underlying wood during accelerated UV ageing,demonstrating outstanding optical stability.[Conclusion]Triazine-functionalized,wood-derived carbon dots were used to overcome the weak UV absorption,low shielding efficiency,and poor transparency of conventional additives.The broad-spectrum UV-vis conversion of THT-CDs delivers high UV blocking without sacrificing transparency.A clear,durable,grain-preserving anti-aging film was formed on wood.The approach bypasses the poor clarity of conventional UV blockers and upgrades fast-grown fir into a highvalue material,offering a green route for furniture,displays and outdoor timber.