香豆素修饰的碳量子点光稳定剂的制备与性能
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摘要
以柠檬酸为碳源,通过水热反应制备碳量子点,再采用1-乙基-3-(3-二甲氨基丙基)碳二亚胺盐酸盐/N-羟基琥珀酰亚胺(EDC/NHS)酰胺反应催化体系,将7-氨基-4-甲基香豆素(AMC)修饰至碳量子点上,合成出一种香豆素修饰的碳量子点光稳定剂(AMC-CQDs)。考察了其光学性能和纸张表面应用性能,运用1931-CIE色度坐标,初步探究了纸张返黄过程中色度变化规律。结果表明:合成的AMC-CQDs粒径均匀,平均粒径为4.13 nm,具有良好的水溶性和紫外吸收性能,基本实现紫外区的全覆盖吸收,其最大荧光发射波长为431 nm,荧光量子产率达到38.7%,适用于高得率浆纸张增白;当涂布淀粉糊化液中AMC-CQDs含量为0.6%(以糊化液的质量为基准,下同)时,可将纸张的初始白度提高4.71%ISO;色度坐标显示,该碳量子点光稳定剂对于色度坐标位于y=1.553x-0.184附近的纸张具有良好的光物理增白效果。
Carbon quantum dots(CQDs) were successfully prepared by a hydrothermal reaction using citric acid as the carbon source, and then modified with 7-amino-4-methyl coumarin(AMC) in a catalyst system containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-Hydroxysuccinimide(EDC/NHS), which produced a coumarin-modified carbon light stabilizer(AMC-CQDs). The optical properties of AMC-CQDs and its application properties on the surface of paper were studied. And the law of change on chromaticity of the paper was analyzed by 1931-CIE chromaticity coordinates. The results revealed that the synthesized AMC-CQDs had a uniform particle size distribution of 4.13 nm, and exhibited good water solubility and UV absorption, which could realize a full coverage absorption in UV light area. The maximum fluorescence emission wavelength of AMC-CQDs was 431 nm, and the fluorescence quantum yield reached 38.7%. The initial whiteness of the paper was increased by 4.71%ISO when the dosage of AMC-CQDs was 0.6%(based on the mass of coating starch gelatinizing solution, as the below) in coating starch gelatinizing solution, indicating that AMC-CQDs was suitable for high yield pulp paper whitening. In addition, the results of chromaticity coordinates showed that the carbon light stabilizer had a good light physical whitening effect for the paper with chromaticity coordinates in the vicinity of the line y=1.553 x-0.184.
Carbon quantum dots(CQDs) were successfully prepared by a hydrothermal reaction using citric acid as the carbon source, and then modified with 7-amino-4-methyl coumarin(AMC) in a catalyst system containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-Hydroxysuccinimide(EDC/NHS), which produced a coumarin-modified carbon light stabilizer(AMC-CQDs). The optical properties of AMC-CQDs and its application properties on the surface of paper were studied. And the law of change on chromaticity of the paper was analyzed by 1931-CIE chromaticity coordinates. The results revealed that the synthesized AMC-CQDs had a uniform particle size distribution of 4.13 nm, and exhibited good water solubility and UV absorption, which could realize a full coverage absorption in UV light area. The maximum fluorescence emission wavelength of AMC-CQDs was 431 nm, and the fluorescence quantum yield reached 38.7%. The initial whiteness of the paper was increased by 4.71%ISO when the dosage of AMC-CQDs was 0.6%(based on the mass of coating starch gelatinizing solution, as the below) in coating starch gelatinizing solution, indicating that AMC-CQDs was suitable for high yield pulp paper whitening. In addition, the results of chromaticity coordinates showed that the carbon light stabilizer had a good light physical whitening effect for the paper with chromaticity coordinates in the vicinity of the line y=1.553 x-0.184.
引文
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[22]Pan Dengyu,Zhang Jingchun,Li Zhen,et al.Observation of pH-,solvent-,spin-,and excitation-dependent blue photoluminescence from carbon nanoparticles[J].Chemical Communications,2010,46(21):3681-3683.
[23]Zhang Guanghua(张光华),Xu Hailong(徐海龙),Guo Jinge(郭锦鸽),et al.Synthesis and properties of new yellowing inhibitor with fluorescence whitening[J].CIESC Journal(化工学报),2012,63(10):3358-3364.
[2]Cannell Eric,Cockram R.The future of BCTMP[J].Pulp and Paper,2000,74(5):68-70.
[3]Krishna Krishna B,Blok Kornelis,Patel Martin K.Innovations inpapermaking:An LCA of printing and writing paper from conventional and high yield pulp[J].Science of the Total Environment,2012,439(1):307-320.
[4]Ni Yonghao,He Zhibing,Zhang Hongjun.Characteristics of high yield pulp and its effect on some typical wet-end issue[J].Journal of Biobased Materials&Bioenergy,2011,5(2):181-186.
[5]Hu Thomas Q,Williams T,Pikulik I I.Design,synthesis and studies of yellowing inhibitors with high affinity to mechanical pulps[J].Journal of Pulp&Paper Science,2005,31(3):109-115.
[6]Beaton Christa R,Argyropoulos Dimitris S.Photostabilizing milled wood lignin with benzotriazoles and hindered nitroxide[J].Photochemistry&Photobiology,2001,73(6):605-612.
[7]Hu Thomas Q,Osmond David A,Schmidt John A.Design,synthesis and fibre-reactivity study of a water-soluble,monochloro-s-triazinyl hindered nitroxide on mechanical pulps[J].Polymer Degradation&Stability,2004,83(3):547-553.
[8]Zhang Guanghua,Zheng Hua,Guo Mingyuan,et al.Synthesis of polymeric fluorescent brightener based on coumarin and its performances on paper as light stabilizer,fluorescent brightener and surface sizing agent[J].Applied Surface Science,2016,367:167-173.
[9]Yang Xudong,Yang Xue,Li Zhenyu,et al.Photoluminescent carbon dots synthesized by microwave treatment for selective image of cancer cells[J].Journal of Colloid&Interface Science,2015,456:1-6.
[10]Liang Qinghua,Ma Wangjing,Shi Yao,et al.Easy synthesis of highly fluorescent carbon quantum dots from gelatin and their luminescent properties and applications[J].Carbon,2013,60:421-428.
[11]Li Libo,Yu Bin,You Tianyan.Nitrogen and sulfur co-doped carbon dots for highly selective and sensitive detection of Hg(Ⅱ)ions[J].Biosensors&Bioelectronics,2015,74:263-269.
[12]Kong Weiguang,Wu Huizhen,Ye Zhenyu,et al.Optical properties of pH-sensitive carbon-dots with different modifications[J].Journal of Luminescence,2014,148:238-242.
[13]Tian Jian,Leng Yanhua,Zhao Zhenhuan,et al.Carbon quantum dots/hydrogenated TiO2 nanobelt hetero structures and their broad spectrum photocatalytic properties under UV,visible,and near-infrared irradiation[J].Nano Energy,2015,11:419-427.
[14]Alam Al-Mahmnur,Liu Yanan,Park Mira,et al.Preparation and characterization of optically transparent and photoluminescent electrospun nanofiber composed of carbon quantum dots and polyacrylonitrile blend with polyacrylic acid[J].Polymer,2015,59:35-41.
[15]Barati Ali,Shamsipur Mojtaba,Abdollahi Hamid.Hemoglobin detection using carbon dots as a fluorescence probe[J].Biosensors&Bioelectronics,2015,71:470-475.
[16]Gupta V,Chaudhary N,Srivastava R.Luminscent graphene quantum dots for organic photovoltaic devices[J].Journal of the American Chemical Society,2011,133(26):9960-9963.
[17]Li Yan,Hu Yue,Zhao Yang,et al.An electrochemical avenue to green-luminescent graphene quantum dots as potential electronacceptors for photovoltaics[J].Advanced Materials,2011,23(6):776-780.
[18]Zhang Guanghua,Zheng Hua,Liu Guojun,et al.Synthesis and application of a multifunctional fluorescent polymer based on coumarin[J].Bioresources,2015,11(1):373-384.
[19]Tian Ruixue(田瑞雪).The surface groups regulation and properties research of carbon quantum dots[D].Taiyuan:North University of China(中北大学),2014.
[20]Hou Juying,Tian Zhengbin,Xie Huizhi,et al.A fluorescence resonance energy transfer sensor based on quaternized carbon dots and Ellman's test for ultrasensitive detection of dichlorvos[J].Sensors&Actuators B Chemical,2016,232:477-483.
[21]Zhong Dan,Zhuo Yan,Feng Yuanjiao,et al.Employing carbon dots modified with vancomycin for assaying gram-positive bacteria like staphylococcus aureus[J].Biosensors&Bioelectronics,2015,74:546-553.
[22]Pan Dengyu,Zhang Jingchun,Li Zhen,et al.Observation of pH-,solvent-,spin-,and excitation-dependent blue photoluminescence from carbon nanoparticles[J].Chemical Communications,2010,46(21):3681-3683.
[23]Zhang Guanghua(张光华),Xu Hailong(徐海龙),Guo Jinge(郭锦鸽),et al.Synthesis and properties of new yellowing inhibitor with fluorescence whitening[J].CIESC Journal(化工学报),2012,63(10):3358-3364.