INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Wen-Shuang Zhu,Dai Sun,Ling-Li Yu,Shao-Qi Zhi,Yu-Dong Shan,Yi-Fang Lu,Hai-Tao Ren,Song-Hai Wu,Yong Liu,Xu Han
In this study, Bi2.15WO6 with different morphologies was successfully synthesized and used for the selective photooxidation of benzyl alcohol to benzaldehyde in aqueous solutions. High conversion (85%) and selectivity (85%) can be simultaneously achieved under alkaline conditions by adding ethylenediamine to protect the produced benzaldehyde from overoxidation. In the oxidation process, ≡Bi–OO• and ≡Bi–OOH on Bi2.15WO6, instead of OH• and O2•–, are the primary oxidizing species to sequentially abstract two H (H+ + e–) from benzyl alcohol, accompanied by the formation of H2O2. Meanwhile, h+ and OH– also minorly contribute to the selective oxidation of benzyl alcohol via the H-abstraction pathway. This study enriches our understanding of the oxidizing species involved in the selective photooxidation of benzyl alcohol to benzaldehyde.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Jingwen Li,Hui Yu,Lijuan Wang,Qing Ma,Dongkun Zhao,Baocheng Xu,Xinjing Dou,Lili Liu
This study investigated the protective effects of five colored PET films against phytosterol (PS) oxidation in vegetable oil. The transparent film demonstrated the lowest inhibition rates for the formation of phytosterol oxidation products (POPs) among the five coloured films, which inhibited PS oxidation solely by reducing light intensity. In contrast, the blue film exhibited superior light barrier characteristics, effectively blocking wavelengths corresponding to ultraviolet light and chlorophyll excitation bands. This dual mechanism significantly reduced both auto-oxidation and type II photooxidation pathways of PS. Consequently, the blue film increased inhibition rates for POPs (7α-OH-PS, 7β-OH-PS, 5α,6α-epoxy-PS, 7-keto-PS, 6β-OH-PS, and 5β,6β-epoxy-PS) from 22.12 %, 13.66 %, 15.08 %, 12.16 %, 12.93 %, and 10.70 % to 76.60 %, 75.29 %, 79.40 %, 75.41 %, 77.56 %, and 75.33 %, respectively. Mechanistic analysis revealed that the blue film's enhanced protection for PS oxidation originated from its inhibition of C7 pathway-mediated POP generation. While red, yellow, and green films operated through similar protective mechanisms, their efficacy varied significantly. The overall protective performance was ranked as follows: red ≈ blue > yellow > green > transparent. These findings provide critical insights for developing optimized packaging solutions to inhibit PS oxidation in lipid-containing food products.
研究领域:
食品科学
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植物化学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2025
·
IF 3.6
Haiyang Wang,Fujun Li,Wenbo Yang,Yuchao Wang,Alexander A. Miskevich,Valery A. Loiko,Lijing Zhang,Shengyang Tao
The mechanistic understanding of how alkylamines impact Ni-metallophotoredox C–N coupling to form diarylamines remains unclear. In this study, 12-alkylamines were evaluated as additives to determine their effects on the synthesis of diarylamines in a flow photochemical system. Notably, n-hexylamine demonstrated the most significant promotional effect. Spectroscopic studies and experimental data reveal n-hexylamine substitutes DABCO as a Ni catalyst ligand, enhancing yields particularly in sterically hindered arylamines.
研究领域:
有机化学
·
合成化学
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Zhenyu Zeng,Hongxing Xie,Yun Ye,Xingke Zheng,Qizhong Lin,Enguo Chen,Sheng Xu,Tailiang Guo
Alloyed quantum dots (QDs) show great potential for photoluminescence (PL) applications. However, the oxidative decay of QDs during photoexcitation has been a major hurdle to the application of QDs. Blocking water-oxygen erosion by coating oxides on the surface of QDs is a common technique. Even though, this approach often leads to alterations in the optical properties of QDs and reduced compatibility with polymers. In this paper, hindered phenol was utilized to treat QDs to form QD/Hindered phenol complexes. Using the reduction of phenolic hydroxyl group in the hindered phenol, the hindered phenol was used as an exhausted substance to protect QDs from oxidation . After 450 h of aging, the obtained QD/Hindered phenol complex kept the photoluminescence quantum yield (PLQY) at 48 %. The luminance of the QD diffusion plate prepared by the QD/Hindered phenol complexes maintained above 98 % of the initial value after aging 1032 h. The introduction of phosphite ester further improved the photostability of QD/Hindered phenol complex under blue-light excitation. This technique promotes the application of QDs in polymers and offers a new reference for improving the stability of QDs under photoexcitation.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhihao Song,Lei Xu,Cheng Xie,Yanzhi Liu,Zhaohui Han,Junyu Lu
Visible light-driven photo-oxidation reactions hold significant potential for the treatment of gaseous pollutants. However, the weak internal electric field of carbon nitride (g-C 3 N 4 ) leads to sluggish migration of photogenerated carriers, while inefficient electron-hole pair separation further limits the overall photo-oxidation efficiency. In this study, nitrogen-vacancy (Nv) rich crystalline (Cs)/amorphous g-C 3 N 4 was synthesized using a two-step calcination method. The increased crystallinity facilitates faster carrier migration, broadens the potential difference between the crystalline and amorphous regions, and enhances the piezoelectric response. On the other hand, the incorporation of nitrogen vacancies (Nv) introduces asymmetry, generating a dipole field that significantly improves the efficiency of electron-hole pair separation. Moreover, the presence of NV improves the adsorption and activation of O 2 molecules, promoting the photo-oxidation of adsorbed NO via the generation of single linear oxygen ( 1 O 2 ). The resulting material, Cs-Nv-630, demonstrated excellent oxidative NO removal efficiency, achieving a removal rate of 95.3 % under visible light irradiation. This study highlights a novel strategy for enhancing photo-oxidation activity through structural engineering, leveraging crystallinity and dipole fields to optimize carrier migration and complexation.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Bianyang He,Shiheng Wan,Xuemei Li,Chuyue Xu,Yixin Li,Jianying Yu,Bo Xiong,Yafang Tang,Lei Zhu
Lignin (LG) is utilized to strengthen the photooxidative aging resistance of bitumen due to its ability to absorb ultraviolet (UV) radiation and scavenge free radicals. However, the anti-aging performance of LG is constrained by a dilemma: at low dosages, the functional structures are insufficient; while at high dosages, uneven dispersion occurs within the bituminous matrix. Herein, we demonstrate a strategy to functionalize LG for improving bituminous photooxidative aging resistance through synergistically introducing benzene rings and adjusting intramolecular polarity. Specifically, 4,4′-diphenylmethane diisocyanate (MDI) functionalized LG (MFLG) was synthesized via covalent bonding between hydroxyl and isocyanate groups, and its structural properties were analyzed using multiple characterization techniques. The results revealed that the introduction of benzene rings enhanced the particle size, hydrophobic, thermal stability, and UV absorption capacity of LG. Meanwhile, bitumen modified with MFLG (MFLG-MB) demonstrated superior resistance to photooxidative aging compared to LG modified bitumen (LG-MB) and pristine bitumen (PB). Furthermore, molecular simulations (MS) elucidated the anti-aging mechanism. The incorporation of MDI improved the dispersion of LG within the bituminous matrix, as evidenced by binding energy calculations, which was beneficial for anti-aging protection of bitumen. Snapshots, electrostatic potential, and dipole moment values further demonstrated that MFLG exhibited stronger intramolecular polarity and higher affinity for asphaltenes compared to LG. These properties underscored MFLG's critical role in inhibiting asphaltene gelation for enhancing the photooxidative aging resistance significantly. This finding highlights a novel strategy to improve the anti-aging effectiveness of LG in bitumen by increasing aromatic groups and optimizing intramolecular polarity.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2015
·Vol. 39
·期 1
·97-101
·
IF 2.442
Dajie Zhang,Binzhe Sun,Lian Duan,Yufang Tao,Aihua Xu,Xiaoxia Li
The production of chemicals from lignin by green and sustainable technologies is a promising alternative route to replace fossil fuels. Photooxidation of guaiacol, a model of lignin, to value-added carboxylic acids with microwave discharge electrodeless lamps as light source was investigated in the presence of hydrogen peroxide (H 2 O 2 ). The coupled UV-vis/microwave irradiation led to a more effective degradation of guaiacol than with conventional photocatalysis. Hydroxyl radicals as active species, confirmed by electron spin resonance spin-trapping, were generated and participated in the oxidation. The effect of different operating conditions such as reaction time, guaiacol concentration, solution pH, as well as oxidant concentration, was evaluated.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2022
·Vol. 40
·期 9
·1045-1052
·
IF 5.56
Kui Wang,Guo-Jie Gao,Xiao-Yan Wang
Comprehensive Summary In this work, a spherical calixpyridinium–IR-820 supramolecular assembled material was fabricated based on the calixpyridinium- induced IR-820 aggregation. This assembled material exhibited a well visible light responsiveness by the photodecomposition of aggregated IR-820 accompanied by an obvious color change. Such photochromic material has many potential applications. More interestingly, the photodecomposition of aggregated IR-820 was significantly promoted, although the aggregated photosensitizers usually exhibited a lower photoreactivity. This approach can be further extended to construct various visible-light responsive supramolecular assembled materials and potentially applied in many fields. Herein, benefitting from the pH-dependent luminescent properties of calixpyridinium and the photodegradation products of IR-820, a pH-controlled visual multicolor luminescence was achieved, which was perfectly applied in the detection of pH from 5 to 10 by naked eyes.
研究领域:
化学
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材料科学
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光学
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产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 15
·期 3
·353-360
·
IF 3.532
Qingchun Huang,Hongcan Sun,Changgui Lu,Chunlei Wang,Shuhong Xu
Exploring the origin of emission is fundamental in the field of carbon dots (CDs). Due to the lack of suitable in situ probing techniques, it is necessary to explore effective alternative methods that can accurately reflect the relationship between the emission and the composition of the functional groups of CDs. Herein, we propose a new method of post-synthetic treatment of CDs by photo-oxidation to investigate the origin of emission for CDs. After the addition of a photo-oxidant into pre-prepared CDs under UV irradiation, the fluorescence of CDs can be regulated from the original orange emission to the final green emission due to the damage of original functional groups and the formation of new functional groups on CDs during the post-treatment process. The abundant dynamic information about the functional groups and emissions of CDs during the visible and ready-to-monitor post-treatment process makes it possible to quantitatively analyze the origin of the emission of CDs. Our results suggest that the emission sub-peaks at 560 nm and 600 nm relate to the CD surface-state-associated –NH3+ groups, while the emission sub-peak at 537 nm or 494 nm is associated with the CD surface-state-associated –OH groups or the CD surface-state-associated carbonyl groups (CO). Under UV irradiation, the CD surface-state-associated –NH3+ groups can be continuously converted into the CD surface-state-associated –OH groups and the CD surface-state-associated carbonyl groups (CO), leading to the changed emission color of CDs.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 34
·7001-7012
·
IF 0
Wen-Liang Gong,Bo Wang,Matthew. P. Aldred,Chong Li,Guo-Feng Zhang,Tao Chen,Lei Wang,Ming-Qiang Zhu
In this paper, the bromination of carbazole has been controlled and then subsequent mono, di, tri and tetra-bromocarbazoles have been subjected to Suzuki cross-coupling to yield a series of carbazole-tetraphenylethene (TPE) materials with varying numbers of peripheral TPE groups. Accompanied by 2,7-dibromo-carbazole, five new Cz-TPE materials are successfully synthesized. All the Cz-TPEs are non-fluorescent in THF and emit strong blue-green fluorescence in aggregate states (fw = 90%) and thin films because of their aggregation induced emission (AIE) nature. In THF (10−5 M) solution, all the Cz-TPEs emit deep blue fluorescence after UV irradiation and we find that the more the TPE groups, the slower the enhancement of fluorescence. In thin films (40 nm), the emission maximum blue shift decreases and finally becomes non-emissive after about 1.5 h of UV irradiation for all the Cz-TPEs. We suppose these optical properties are attributed to photo-induced irreversible changes of TPE to diphenylphenanthrene derivatives. The photo-oxidation process for Cz-1TPE has been investigated and proved by HPLC analysis, 1H NMR and LS-MS. Electrochemical properties of all the Cz-TPEs are investigated by cyclic voltammetry and with UV-absorption spectra, and their energy levels are calculated. Finally, we applied the Cz-TPEs to organic light emitting diode (OLED) devices by the spin coating deposition process with OLED devices configuration: ITO/PEDOT (40 nm)/Cz-TPEs (50 nm)/TPBi (40 nm)/LiF (1 nm)/Al (100 nm). All EL devices emit blue-green light with a maximum luminance (Lmax) of 2858, 1353, 986, 2088 and 1129 cd m−2, a maximum current efficiency (ηc,max) of 3.5, 4.9, 3.1, 3.1 and 5.5 cd A−1, a maximum power efficiency (ηP,max) of 2.1, 3.9, 2.2, 1.8 and 3.1 lm W−1 and a turn on voltage (Von) of 3.5, 3.5, 3.3, 3.6 and 4.2 V for Cz-1TPE, Cz-2TPE, Cz-3TPE, Cz-4TPE, Cz-2TPE (2,7), respectively.
研究领域:
有机化学
·
材料科学
·
光电材料
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DOI
MECHANISMS OF AGEING AND DEVELOPMENT
·
2023
·
IF 5.3
Shuzhen Yu,Yating Shao,Qineng Qiu,Yu Cheng,Renkun Qing,Cai-Feng Wang,Su Chen,Chen Xu
Methods allowing light energy to be modulated in a controllable fashion are potentially important for finding the correlation between light-related environmental factors and aging-related lifespan. Here, we report photo- and thermo-regulation based on photonic crystals (PCs) for extended longevity of C. elegans . We show that PCs can function as a regulator of visible spectrum to tune photonic energy received by C.elegans . We provide direct evidence that lifespan depends on photonic energy, and the use of PCs reflecting blue light (440–537 nm) gives 8.3 % increasement in lifespan. We demonstrate that the exposure to modulated light alleviates photo-oxidative stress and unfolded-protein response. We realize reflective passive cooling temperature using PCs, and favorable low temperature could be created for worms to extend lifespan. This work offers a new path based on PCs to resist negative effects light and temperature for longevity, provides an available platform for studying the role of light in aging.
研究领域:
生物学
·
老年学
·
光学
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Wenting Wu,Congcong Han,Qinhua Zhang,Qinggang Zhang,Zhongtao Li,David J. Gosztola,Gary P. Wiederrecht,Mingbo Wu
Carbon nitride as a metal-free conjugated polymer exhibits an intriguing prospect for the design of advanced photosensitizers for singlet oxygen ( 1 O 2 ) generation. However, the intersystem crossing (ISC) process is quite insufficient in carbon nitride, limiting the 1 O 2 generation. Here, we report a facile and general strategy to confined benzophenone as a heavy atom-free spin converter dopant in carbon nitride via the facile copolymerization . With proper energy level matching between the heavy atom-free spin converter and various ligands based on carbon nitride precursors, the proper combination can decrease the singlet-triplet energy gap (ΔE ST ) and hence generate 1 O 2 effectively. Due to its significant and selectivity for 1 O 2 generation, the as-prepared carbon nitride-based photosensitizer shows a high selective photooxidation activity for 1,5-dihydroxy-naphthalene (1,5-DHN). The product yield reached 71.8% after irradiation for 60 min, which was higher than that of cyclometalated Pt II complexes (53.6%) in homogeneous photooxidation. This study can broaden the application of carbon nitride in the field of selective heterogeneous photooxidation due to simple operation, low cost, and high efficiency, making it a strong candidate for future industrialization.
研究领域:
材料科学
·
光化学
·
环境科学
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产品关联
DOI
高影响因子
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