Coatings
·
2022
·Vol. 12
·期 5
·585
·
IF 3.236
Wen Sun,Xuankun Li,Jingtao Zou,Han Guo
TiO2is widely used for the photocatalytic degradation of organic pollutants in wastewater, but the practical applications of the photocatalyst are limited due to its poor visible light absorption and low recovery rate. In this study, high production of nitrogen-doped TiO2was achieved by a hydrolysis precipitation method; the obtained N-TiO2had a small crystallite size and good dispersibility. The effect of calcining temperature on the photocatalytic performance of N-TiO2was evaluated through the degradation of methylene blue (MB) in a blue light LED irradiation cylinder, it was found the N-TiO2calcined at 400 °C showed the best photocatalytic activity. Then the N-TiO2was immobilized on SiC ceramic foam by dip-coating with PVA as the binder. The prepared N-TiO2/SiC foam showed excellent photocatalytic activity under blue light LED irradiation; as high as 96.3% of MB was degraded at optimum conditions. After five cycles of MB photodegradation, the photocatalytic activity of N-TiO2/SiC foam only changed slightly, which makes it a promising photocatalytic material for wastewater treatment.Keywords:nitrogen-doped TiO2;SiC foam;LED irradiation;photodegradation;methylene blue
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 10
·1285-1291
·
IF 1.536
Xie Chuanbao,Leng Kangwei,Sheng Jie,Wang Xuemei,Li Qianmin,Song Liang,Liu Lei,Sun Hejing,Huang Xiaowen,Wang Zhongwei,Yu Qing
Poly(methyl methacrylate) (PMMA) microspheres were synthesized through visible light–induced photopolymerization of methyl methacrylate (MMA). 2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO), polyvinylpyrrolidone (PVP), and light-emitting diodes (LEDs) were used as the photoinitiator, stabilizer, and light source, respectively. No other additive was involved. The effect of LEDs, TPO, and PVP was discussed. Results showed that PMMA microspheres with the size of 0.5–0.8 μm could be obtained when LED@385 nm was the light source, and the content of TPO and PVP was 2 wt% and 30 wt% of MMA. Moreover, the possible formation pathway of PMMA microspheres was proposed based on the investigation of reaction time and addition method of PVP.
Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2020
·
IF 3.721
Ahui Xue,Wenjing Liang,Shide Wen,Yuanyuan Gao,Xueyong Huang,Yuzhen Tong,Yingbin Hao,Liping Luo
Broccoli sprouts are rich in secondary metabolites, especially glucosinolates (GLs). The synthesis of GLs can be modified by light. In this study, extractive electrospray ionization-mass spectrometry (EESI-MS) was used to analyze the broccoli sprouts extracts (BSE) under different light quality treatments. Multivariable statistical methods were used to analyze the difference of different light quality treatments. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to analyze the gene expression of key enzymes in the aliphatic-GLs biosynthesis pathway. Nineteen compounds, including 7 GLs, 3 phenolic acids, 6 amino acids and 3 organic acids were simultaneously detected in one minute by EESI-MS. Relative expression of MYB28 , BCAT4 , CYP79F1 , CYP83A1 and AOP3 were mostly upregulated in R5B5 (light ratios of red/blue 5:5) treatment. These findings suggest that blue light improving the accumulation of secondary metabolites in broccoli sprouts, and the R5B5 treatment was most beneficial. Furthermore, we established EESI-MS method to simultaneous and rapid detection of secondary metabolites in broccoli sprouts, especially GLs. This study could provide a reference for selecting proper LED lighting conditions to produce broccoli sprouts with high content of bioactive components, and provides light regulation technology and theoretical basis for the industrialized production of sprouts.
研究领域:
植物学
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代谢组学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
PHOTOSYNTHESIS RESEARCH
·
2023
·
IF 3.7
Su Pengfei,Ding Shuangshuang,Wang Dacheng,Kan Wenjie,Yuan Meng,Chen Xue,Tang Caiguo,Hou Jinyan,Wu Lifang
Different light spectra from light-emitting diodes (LEDs) trigger species-specific adaptive responses in plants. We exposed Artemisia argyi ( A. argyi ) to four LED spectra: white (the control group), monochromatic red light (R), monochromatic blue light (B), or a mixture of R and B light of photon flux density ratio is 3 (RB), with equivalent photoperiod (14 h) and light intensity (160 μmol s −1 m −2 ). R light accelerated photomorphogenesis but decreased biomass, while B light significantly increased leaf area and short-term exposure (7 days) to B light increased total phenols and flavonoids. HPLC identified chlorogenic acid, 3,5-dicaffeoylquinic acid, gallic acid, jaceosidin, eupatilin, and taxol compounds, with RB and R light significantly accumulating chlorogenic acid, 3,5-dicaffeoylquinic acid, and gallic acid, and B light promoting jaceosidin, eupatilin, and taxol. OJIP measurements showed that B light had the least effect on the effective quantum yield ΦPSII, with higher rETR(II), Fv/Fm, qL and PIabs, followed by RB light. R light led to faster photomorphology but lower biomass than RB and B lights and produced the most inadaptability, as shown by reduced ΦPSII and enlarged ΦNPQ and ΦNO. Overall, short-term B light promoted secondary metabolite production while maintaining effective quantum yield and less energy dissipation.
研究领域:
植物学
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药用植物研究
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光生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PLANT GROWTH REGULATION
·
2024
·
IF 3.9
Luo Liping,Zhang Gaowei,Liang Wenjing,Wu Dong,Sun Qifang,Hao Yingbin
Broccoli microgreens represent a novel type of vegetable characterized by high levels of bioactive compounds. Here, we investigated the effects of light-emitting diode (LED) light quality on the development and nutritional uptake of broccoli microgreens. The plants were exposed to five distinct light treatments: white, single red, and red: blue at 5:1, 5:3, and 5:5 ratios. The soluble sugars, nutrients, and secondary metabolites of broccoli sprout extracts were examined using high-performance liquid chromatography and ultra-high-performance liquid chromatography quadrupole time-of-flight mass spectrometry under various light-quality conditions. In addition, the expression levels of genes encoding important enzymes in the glucosinolates (GLs) biosynthesis pathway were examined using quantitative real-time polymerase chain reaction. Overall, the findings demonstrated that mixed red-blue light, especially the 5:1 red: blue ratio, was beneficial for broccoli microgreens in terms of their hypocotyl length, fresh weight, edible rate, soluble proteins, vitamin C, total phenolics, total flavonoids, and GLs. Our findings provide a foundation and reference point for selecting the most appropriate LED light ratio in microgreens production.
研究领域:
植物学
·
农业科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Luyin Zhao,Jingmei Li,Jiayun Shao,Ling Zhang,Yuhao Ji,Xiulong Li,Dianmin Ju
The contamination of water resources in recent years has resulted in the dissemination of harmful bacteria via water sources, posing a significant threat to the safety and well-being of humans, animals, and plants. Consequently, there is a growing concern over the health and sanitation of water resources. Photocatalysis, a novel and very effective antibacterial method, has gained significant attention in the area of antibacterial research. Bismuth nitrate pentahydrate and sodium tungstate dihydrate were used in a straightforward hydrothermal process to create nanoflower spheres Bi 2 WO 6 /ZnO photocatalytic composites in molar ratios of 1:1, 1:2, 1:3, and 1:4. The first-ever demonstration of the photocatalytic broad-spectrum antibacterial activity of porous nanoflower spheres Bi 2 WO 6 /ZnO composites was shown. The samples were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet–visible spectroscopy (UV–vis). The antibacterial activity was evaluated using the dilution coated plate technique, with LED light irradiation. The findings indicate that the Bi 2 WO 6 /ZnO composite has a much superior antibacterial activity against both bacteria and fungus compared to individual Bi 2 WO 6 and ZnO. When exposed to LED lighting with an intensity of 35 W, the Bi 2 WO 6 /ZnO nanoparticles in a 1:2 ratio at a concentration of 1000 mg/L demonstrated complete antibacterial effectiveness against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis within 30 min. Similarly, the nanoparticles achieved 100 % antibacterial efficiency against Candida albicans within 90 min. The antibacterial efficacy of 1000 mg/L 1:2 Bi 2 WO 6 /ZnO nanoparticles against Escherichia coli and Staphylococcus aureus was found to be 100 % within 5 min under natural lighting conditions. The findings indicate that Bi 2 WO 6 /ZnO nanoparticles have excellent photocatalytic broad-spectrum antibacterial efficacy.
研究领域:
环境科学
·
微生物学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 37
·46686
·
IF 1.901
Safdar Ali,Farooq Khurum Shehzad,Inamullah Maitlo,Sultan Valiev,Ghulam Muhyodin,Jun Nie
Two types of cryogels were obtained using 2-hydroxyethyl acrylate (HEA) and 2-hydroxyethyl methacrylate (HEMA) by homogeneous mixing with poly(ethylene glycol) diacrylate (PEGDA) as crosslinker at subzero temperature followed by photopolymerization with two different light initiation sources (high-pressure Hg arc lamp and UV-LED).The solution was frozen unidirectionally at −60 °C before polymerization and finally photopolymerized at the same temperature. The cryogels were characterized using photo-DSC, UV–vis and Fourier transform infrared spectroscopy, and scanning electron microscopy techniques. The cryogels cured with an LED light showed a higher polymerization rate and better morphological characteristics than ones cured with a high-pressure Hg arc. The water intake ratio of HEA/PEGDA was higher than HEMA/PEGDA for both curing sources. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46686.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 11
·5330-5337
·
IF 3.3
Yu Wang,Rao Chen,Dongmei Liu,Chaofei Peng,Junwei Wang,Xiaoqing Dong
The development of effective Vis-sensitive photoinitiators for light-emitting diode (LED) polymerization is still an emerging challenge as LEDs are being developed into the predominant light sources. In this work, a series of new functionalized photoinitiators, containing thioxanthones and oxime-esters as functional groups, was designed and straightforwardly synthesized in two steps. The structures of the photoinitiators were studied using 1H NMR, 13C NMR, and high-resolution mass spectrometry. The conclusion of the photophysical properties indicated that the long wavelength absorptions from 360 nm to 405 nm made the investigated thioxanthone derivatives quite appealing as a valuable photoinitiator under UV-Vis LEDs. The structure–reactivity relationship was also studied in detail through real-time FTIR spectroscopy. A possible photolysis mechanism was expected based on further photolysis and online 1H NMR activities. With a proper molecular design, the new functionalized photoinitiators were synthesised straightforwardly and they displayed more advanced initiation abilities than their parent thioxanthone.
研究领域:
材料化学
·
光化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23338-23343
·
IF 3.925
Chenhan Yu,Xinyi Feng,Qiuyu Li,Jiahui Peng,Yu Xiang,Yanting Song,Haoyu Feng,Yunye Huang,Longqiang Xiao,Linxi Hou
Photo-induced controlled radical polymerization (CRP) mediated by heterogeneous catalysts provides excellent spatiotemporal control and has been widely studied in view of green chemistry and potential biomedical applications. In this paper, an ionic heterogeneous catalyst (TD-I) was synthesised in a facile manner under mild conditions for inducing the reversible complexation-mediated polymerization (RCMP) of poly (polyethylene glycol monomethyl ether methacrylate) (PPEGMA) in an aqueous solution under white LED light irradiation. The obtained PPEGMA has a controllable molecular weight and a narrow molecular weight distribution. The spatio-temporal control of the catalytic system and the high chain end fidelity of the polymer have been successfully verified by on-off light experiments and chain expansion experiments. The activity and efficiency of TD-I remained essentially unchanged after being used for three cycles. Such a heterogeneous photocatalyst which can be easily separated and efficiently reused is promising for industrial applications.
研究领域:
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Dawei Zhao,Yimei Liu,Yating Zhang,Shitao Liu,Xiwang Zhang,Tao Wang
Organosilicon polymers exhibit excellent biocompatibility and stable chemical properties, and the use of photopolymerization in synthesizing silicone polymers is increasing due to its environmental and energy-saving benefits. However, most photoinitiators cannot be dissolved in a sufficient quantity in silicone prepolymers and have wavelengths that do not align with eco-friendly LED light sources, posing challenges in the photopolymerization of silicone prepolymers. This study focuses on the synthesis of two flavonol photoinitiators, HF-MDT and HF-MTQ, incorporating poly(sesquisiloxanes). The results for photopolymerization demonstrated that they have good compatibility with methacrylate-containing poly(sesquicarbazone) prepolymer, enabling the initiation of photopolymerization under 365 or 460 nm LEDs when combined with co-initiators triethanolamine/iodonium salt (TEOA/ONI). Films cured with HF-MDT and HF-MTQ exhibited enhanced migratory stability and hydrophilicity, making these photoinitiators suitable for various applications, such as silicone coating manufacturing, medical devices, and food packaging. Through fluorescence burst experiments, cyclic voltammetry experiments, and electron paramagnetic resonance experiments, the interaction mechanisms of flavonol photoinitiators with co-initiators were elucidated, providing insights into their photoinitiation activities under LED light sources.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Mohsin Pasha,Minjing Shang,Yuhan Wang,Saier Liu,Xiao Xue,Yuanhai Su
α-aminonitriles (AN) are valuable intermediates and building blocks with versatile applications in organic synthesis. Herein, we presented a visible LED-based photomicroreactor for the AN synthesis with three amine substrates, i.e., dibenzylamine (DBA), pyrrolidine (PYR) and piperidiene (PIP), using meso‑tetraphenylporphyrin (m-TPP) and trimethylsilyl cyanide (TMSCN) as photosensitizer and cyanide source, respectively. The results showed that the photooxidative cyanation is a chromoselective and wavelength-selective photochemical transformation with the optimum AN yield and selectivity of 98.2% and 99.5% at a residence time of 2.69 min. Computational studies indicated that a high energy gap between the molecular orbitals of PYP, PIR and their imine intermediates potentially led to their higher reactivity than DBA and formation of by-products with larger molecular weight. Kinetic investigation showed that the apparent rate constants of the DBA photooxidative cyantaion were improved by rising the LED input power, and the applied photosensitizer exhibited high photostability. The overall photonic efficiency of this photomicroreactor was found to be 54.3% within the wavelength range of 400–440 nm, which is higher than previously used photoreactors. Finally, linear correlations were developed between the input power of LED and apparent rate constants of DBA photooxidative cyanation, which would be beneficial for the design, optimization, and scale-up of this photochemical process.
研究领域:
有机合成
·
光化学工程
·
动力学研究
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Yan Xiong,Jun Tan,Shenwen Fang,Chengjie Wang,Qing Wang,Jiayi Wu,Jie Chen,Ming Duan
In this work, a colorimetric methodology was developed for free chlorine determination by constructing a fiber-optic sensor (FOS) which was designed by using a small LED as light source and two silica fibers as light transmission elements. Then the FOS was integrated with the sequential injection lab-on-valve (SI-LOV) manifold to fabricate a FOS-SI-LOV system for free chlorine detection. The colorimetric determination was based on the reaction between N , N -diethyl- p -phenylenediamine (DPD) reagent and free chlorine, which would produce a chromophore showing maximum absorbance at 511 and 551 nm and detected by a micro spectrometer detector. By choosing a green LED with emission wavelength at 520 nm as light source, the chlorine concentration could be simply evaluated according to Beer's law. The developed FOS-SI-LOV system showed improved performances of wide linear range (10–400 μg L −1 ), low detection limit (3.5 μg L −1 , 3σ), fast analysis (6.85 s) and excellent repeatability (0.0083 RSD, n=8) for chlorine determination. The proposed FOS-SI-LOV system has been applied to on-line and real-time chlorine determination in different water samples with excellent selectivity. Furthermore, this FOS-SI-LOV methodology provided a colorimetric and fluorescence detection platform for other hazardous species monitoring in water environment based on Beer's law and Stern-Volmer relationship, respectively.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）