ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaoli Zhou,Jinhong Deng,Zhe Li,Yun Cheng,Jie Zhou,Min Jiang,Weiliang Dong
Conversion of PET waste into carbon dots (CDs) is an attractive approach to plastic pollution control. However, the preparation of red–yellow CDs is still challenging, and the preparation methods are complex. In this study, a one-pot solvothermal method was developed for the preparation of CDs from PET waste. Through nitrogen source and solvent screening, multicolor (blue–red) CDs with high quantum yield (QY) were prepared. The reaction temperature and catalyst dosage significantly influence the production yield and QY of the CDs. The optimized CD showed a relative yield of 42.7%, a high QY of 47.8%, and a red photoluminescence color. The morphology, crystal structure, surface chemistry, and optical performance of CDs were characterized. The red and yellow fluorescence was mainly due to the molecular state mechanism. White light-emitting diodes with cool and warm white light and a high color rendering index were constructed using yellow and red CDs.
研究领域:
材料科学
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环境科学
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光电
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Rui Wang,Xiaohong Chen,Qiuyu Li,Anying Zhang,Guocong Ma,Yanying Wei,Meiru Qu,Lu Gao,Jianfei Wei
PET-based nitrogen and phosphorus-doped Carbon Dots (NP-CDs) was prepared by solvothermal method with PET waste as raw materials. In terms of structure, NP-CDs were spherical structures with an average particle size of 2.8 nm, and its surface contains amino groups. The as-prepared NP-CDs exhibit excitation-independent emission properties from 300 nm to 430 nm, and the optimal excitation and emission wavelength was 340 nm and 460 nm. In terms of application, the as-prepared NP-CDs could be used to a pH sensor in the range of 2.3–12.3. When NP-CDs were dispersed in polyvinyl alcohol (PVA) matrix, excellent light blocking films(LBFs) for UV and blue light were obtained. When the ratio of NP-CDs is 14 %, it still does not affect the line of sight, and the barrier rate to UV(380 nm) and blue(430 nm) light is as high as 90% and 80 %. In addition, the WLED device with a colour coordinate of (0.29,0.32) and a colour temperature of 8022 K can be obtained with the combination of NP-CDs dispersed in PVA matrix and 395 nm LED chips.
研究领域:
材料科学
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环境科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Yuhang Wu,Guocong Ma,Anying Zhang,Weiwen Gu,Jianfei Wei,Rui Wang
Environmentally friendly polyethylene terephthalate-based carbon dots (PET-CDs) with ultrahigh fluorescence quantum yield were prepared with waste PET textiles as raw materials. First, oligomers were prepared from the reaction of waste PET textile and ethylene glycol by the microwave method. Then, the mixture without isolation and purification as well as pyromellitic acid and urea were adopted as precursors for the preparation of PET-CDs by the hydrothermal method. It was found that the as-prepared PET-CDs had a spherical structure with an average particle size of 2.8 nm. The carbon core of PET-CDs was a graphene-like structure doped with nitrogen atoms in the form of pyrrole nitrogen and the surface contained −NH2, which is convenient for modification and functionalization with various materials in the form of chemical bonds. The as-prepared PET-CDs exhibit excitation-independent emission properties in the range from 340 to 440 nm, and the best excitation and emission wavelengths of PET-CDs are 406 and 485 nm, respectively, while the fluorescence quantum yield is 97.3%. In terms of the application, the as-prepared PET-CDs could be adopted as a fluorescence probe for the detection of Fe3+, and the limit of detection is as low as 0.2 μmol/L. The mechanism of PET-CDs by Fe3+ was found to be the static quenching mechanism. In addition, PET-CDs can be used in LEDs and fluorescent anticounterfeiting.
研究领域:
材料科学
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环境科学
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纳米技术
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分析化学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 10
·2709-2719
·
IF 9.405
Hao Tang,Ning Li,Guangyi Li,Aiqin Wang,Yu Cong,Guoliang Xu,Xiaodong Wang,Tao Zhang
For the first time, gasoline and jet fuel range C7–C8 cycloalkanes and aromatics were selectively synthesized by the alcoholysis of poly(ethylene terephthalate) (PET) waste, followed by solvent-free hydrogenation and hydrodeoxygenation (HDO). It was found that methanol is highly reactive for the alcoholysis of PET waste. In the absence of any catalyst, a high yield of dimethyl terephthalate (97.3%) was achieved under mild conditions (473 K, 3.5 h). Dimethyl terephthalate exists as a solid and can be automatically separated from methanol with a decrease in temperature. Subsequently, dimethyl terephthalate was liquefied to dimethyl cyclohexane-1,4-dicarboxylate by hydrogenation over noble metal catalysts. Among the investigated catalysts, Pt/C exhibited the highest activity. Finally, the dimethyl cyclohexane-1,4-dicarboxylate as obtained was further hydrodeoxygenated to C7–C8 cycloalkanes and aromatics that can be used as gasoline or additives to improve the densities (or volumetric heat value) and sealabilities of current bio-jet fuels. Bimetallic Ru–Cu/SiO2 was found to be a promising HDO catalyst. According to the characterization results, the excellent HDO performance of Ru–Cu/SiO2 can be explained by the formation of smaller Ru–Cu alloy particles during the catalyst preparation. In real applications, dimethyl cyclohexane-1,4-dicarboxylate can also be simultaneously hydrodeoxygenated with biomass derived oxygenates to produce jet fuel with a suitable content of cycloalkanes and aromatics.
研究领域:
化学工程
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材料科学
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环境科学
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能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2023
·Vol. 33
·期 4
·1305-1315
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IF 2.7
Wang Rui,Li Shumiao,Huang Hanjiang,Liu Botong,Gao Lu,Qu Meiru,Wei Yanying,Wei Jianfei
An environmentally friendly PET-based Carbon Dots (PET-CDs) with excellent fluorescence properties were prepared with waste PET bottle, pyromellitic acid and ammonia water as raw materials by one-step hydrothermal method. The preparation mechanism of PET-CDs was as follows: PET first underwent ammonolysis reaction to produce terephthalic acid diamide and ethylene glycol, and then dehydrated and carbonized with pyromellitic acid to form PET-CDs. The as-prepared PET-CDs exhibit excitation-independent emission properties in the range from 340 to 440 nm, and the fluorescence quantum yield is as high as 87.36%. In terms of structure, PET-CDs is a spherical structure with an average particle size of 2.0 nm, and its surface contains carboxyl and amino groups. The PET-CDs were dispersed in a PVA matrix to obtain an light blocking films(LBFs) for 250–450 nm light with excellent properties, and its transparency for 450–700 nm light is good. In addition, PET-CDs was used in the fields of LED, and it was found that the color coordinate for the LED assembled with PET-CDs and 395 nm LED chips is (0.55, 0.44) and the correlated color temperature is 2018 K.
研究领域:
材料科学
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环境科学
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纳米技术
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 64
·期 6
·818-833
·
IF 1
Juhua Ou,Yang Rui,Dai Zilin,Kong Zhenxing,Shu Hui,Huang Xueping
Abstract In this study, polyethylene terephthalate samples were blended with hybrid fibers such as chinlon, polypropylene and polyurethane and subjected to glycolysis to obtain fiber derived polyester polyol precursor. Consequently, the polyester precursor was reacted with maleic anhydride to prepare a fiber derived unsaturated resin. The effect of reaction conditions, type of hybrid fibers and their contents on the structure of the polyester polyol precursors were investigated by Fourier transform infrared spectra, hydrogen nuclear magnetic spectra, gel permeation chromatography, high performance liquid chromatography, liquid mass spectrometry and thermogravimetric analysis. The polyester polyol precursors were further used to synthesize fiber derived unsaturated resins with proper viscosity and acid value. Finally, cured resins with excellent thermal stability and mechanical performance for potential commercial application were obtained.
研究领域:
材料科学
·
高分子化学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）