POLYMER
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2024
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IF 4.1
Sitong Liu,Jie Yi,Rui Dai,Meng Wai Woo,Zhulian He,Hui Chen
In this work, the migration of urea and/or formamide plasticizers in crosslinked starch/polyvinyl alcohol (PVA) films under UV irradiation has been accurately quantified by using a combination of GC-MS/MS and UV–Vis analysis. The crosslinked starch/PVA films, prepared with different amide plasticizers (urea, formamide, urea-formamide), were characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and X-ray photoelectron spectroscopy (XPS). After 7 days of UV irradiation, the starch/PVA film plasticized with urea-formamide (A 7 -SPF-UF) exhibited a flat surface morphology, high crystal stability, and highest thermal stability. The migration ratio of urea and formamide for A 7 -SPF-UF was also quantified to be 3.2 % and 4.5 %, respectively, using GC-MS/MS and UV–Vis analysis, indicating optimal migration resistance. The synergistic effect of urea and formamide as plasticizers built the dense network structure of A n -SPF-UF and improved the UV aging resistance, toughness and durability of the film. On one hand, this enhances the market competitiveness of the products; on the other hand, it promotes the development of environmentally friendly materials, aligning with sustainability requirements.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Qingyong Tian,Weijing Yao,Wei Wu,Jun Liu,Zhaohui Wu,Li Liu,Zhigao Dai,Changzhong Jiang
Efficiently reclaiming the utilization of solar light in a photocatalysis system remains very challenging. By integrating full advantage of upconversion material, plasmonic metals, and narrow bandgap semiconductors, β-NaYF4:18%Yb3+ and 2%Tm3+@SnO2@Ag nanoparticles (denoted as NaYF4@SnO2@Ag NPs) are designed and successfully synthesized as a wide-spectral (UV–vis-NIR) responsive upconversion and plasmonic-enhanced photocatalyst. The as-obtained NaYF4@SnO2@Ag NPs present broadband optical absorption dimension, excellent photocatalytic efficiency, and good stability for the degradation of organic dyes. The enhanced photocatalytic performance of NaYF4@SnO2@Ag NPs can be attributed to the synergistic effects of the components composed in this core/shell architecture that result in higher photocarriers yield and favor the efficient transfer of photocarriers and energy. This work gives insight to guidance of fabricating efficient, multicomponent upconversion catalysts and proposes a potential in the field of high-efficiency environmental and energy-related applications.
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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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Tarun Kumar Patle,Kamlesh Shrivas,Ramsingh Kurrey,Seema Upadhyay,Rajendra Jangde,Ravishankar Chauhan
Here, we report an ultrasonic-assisted extraction (UAE) of phytochemicals from bark, leaves, sepals, fruits, and seeds of Dillenia pentagyna (Roxb) using different organic solvents such as chloroform, ethanol, and n-hexane. The preliminary phytochemical screening results showed that the ethanolic extract is enriched with phenolics, flavonoids , tannin , saponin , alkaloid, and terpenoids . The profiling of phytochemicals is carried out employing UV–Vis and Fourier-transform infrared (FTIR) spectroscopy analyses. The higher amount of phenolic compounds obtained in the ethanolic extract of bark and leaves as compared to other parts of the plant. Consequently, a higher amount of total flavonoid compounds unveiled in the bark of targeted species. The ethanolic extract of bark and leaves showed good free radical scavenging activity using DPPH with inhibition percentage of 90.58 ± 1.89% and 76.46 ± 1.58%, respectively, in comparison to standard ascorbic acid at 10 μg/mL. Moreover, the half-maximal inhibitory concentration (IC 50 ) value of bark and leaves are 5.64 and 6.54 μg/mL, respectively, in comparison to standard ascorbic acid . With the best of our knowledge, it is the first report pertaining to characterization and quantification of phenols and flavonoids as well as the investigation of the medicinal property in D. pentagyna .
研究领域:
植物化学
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药理学
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Tong Chen,Xiaoqin Tang,Ziyu Wei,Jinrong Xu,Guangwei Huang,Hecheng Meng,Hui Su,Yongzhi Hu
To enable rapid prediction of the skin-whitening efficacy of dandelion ethanol extract, quantitative prediction models for ABTS and DPPH radical scavenging activities, tyrosinase inhibition rate, and whitening activity index were developed using ultraviolet-visible (UV–Vis) spectroscopy combined with chemometric methods. The underlying mechanisms were further investigated through Fourier transform infrared spectroscopy (FT-IR), liquid chromatography-tandem mass spectrometry (LC-MS/MS), and molecular docking studies. The results demonstrated that UV–Vis spectroscopy combined with feature extraction exhibited robust predictive performance for all whitening-related indicators. The optimal prediction correlation coefficients ( R p 2 ) for each indicator exceeded 0.85, and the residual predictive deviation ( RPD ) values in the validation set were greater than 2.5. Compared to raw spectra, the application of feature extraction could significantly enhance the performance of predictive models. The functional group information obtained from FT-IR, characteristic ultraviolet absorption wavelengths, and LC-MS/MS analysis collectively indicated that flavonoids and phenolic acids were the primary active components contributing to the whitening efficacy. Molecular docking analysis revealed that flavonoids and phenolic acids exhibited stable binding interactions with key target proteins, indicating their potential role in inhibiting melanin synthesis and contributing to the whitening efficacy. This study presented a rapid and reliable approach for evaluating the whitening activity of dandelion ethanol extract. Furthermore, the underlying mechanisms were elucidated through an integrated analysis combining spectroscopic characterization, component identification, and molecular mechanisms. These findings could provide methodological support for the efficient evaluation of whitening efficacy in traditional Chinese medicine and contribute to a deeper understanding of its mechanistic basis.
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DOI
PubMed
高影响因子
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
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2019
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IF 2.786
Ke Wang,Jie Yu,Dibo Hou,Hang Yin,Qiaojun Yu,Pingjie Huang,Guangxin Zhang
The detection of contamination events in water distribution systems remains a major concern to public health. However, much of the contaminant detection methods are supervised learning which cannot adapt to the complex environment in practical applications. In this work, a contaminant detection method using ultraviolet–visible spectroscopy technique was developed to achieve a goal of real-time detection on online acquisition of absorbance spectra. This method combined the advantages of probability distribution, message-passing algorithm and Bayesian theory. Message-passing algorithm was used to achieve a goal of online detection on noisy UV–Vis spectra signals. The proposed Bayesian algorithm organized the message passing schedule and helped to extract sequential patterns for event classification, which can avoid extreme conclusions. In addition, parameters were set up based on reasonable prior, by which the detection model was dynamically updated. Pilot scale experiment was conducted for long-term online monitoring of the water distribution system. And the experiment results showed improved performances in its ability to detect contamination events with higher probabilities , compared to previous studies.
研究领域:
环境科学
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公共卫生
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数据科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Mohsin Pasha,Saier Liu,Minjing Shang,Min Qiu,Yuanhai Su
Photochemical transformations are mobilized by traceless photons of narrow or broad visible light wavelength and have been proven as a green and sustainable synthesis route for organic compounds. However, most of such investigations were restricted to only parametric studies, lacking in examining a synergistic involvement of actinometric, kinetics and mass transfer mechanisms on product yield. To address this vital issue, we executed the synthesis of natural product juglone via the photooxidation of 1,5-dihydroxynapthalene (DHN) mediated through singlet oxygen, which was produced by triplet–triplet energy transfer from three porphyrin-based photosensitizers to triplet oxygen upon irradiation from UV–Vis LED. Compared to the other two photosensitizers, m-TcPP ( meso -tetracarboxyphenylporphyrine) showed a higher molar extinction coefficient and remarkable energy transfer, resulting in higher DHN conversion and juglone yield. Full DHN conversion and 82% yield were obtained at the m-TcPP loading of 2.0 mol% and the residence time of 22.1 min. Actinometric investigation showed that the photon flux was significantly improved by rising m-TcPP and DHN concentrations. The maximum radiant power absorbed by the DHN photooxidation could reach 17.3% of the total input power of UV–Vis LED strip. The detailed reaction mechanism of the DHN photooxygenation was discussed through the Jablonski diagram and rate constants of intermediate steps were determined. A positive relationship between the photon flux and the apparent rate constant was found by rising m-TcPP concentration from 0.01 to 0.05 mM, while the rise in DHN concentration from 5.0 to 10.0 mM resulted in a negative correlation between these parameters. Consequently, a synergistic improvement of photon flux and apparent rate constant was necessitated to attain complete DHN conversion and high juglone yield.
研究领域:
化学工程
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光化学
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有机合成
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绿色化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Qianqian Chen,Xiaobing Yang,Xingping Fu,Junjie Pan,Junmei Zhou,Gengwu Zhou,Kejun Cheng
Currently, antibiotics are extensively utilized in the pharmaceutical industry to assist humans and animals in combating various infectious diseases. The extensive use of various antibiotics enhances the quality of life. However, it can also have negative effects on the environment and human health, including water pollution and the rise of antibiotic-resistant microorganisms. To date, antibiotics have been detected in rivers, groundwater, and even drinking water. There is an urgent need to design and develop advanced materials for the remediation of antibiotics present in our environment. In this paper, we successfully synthesized a novel Ag 2 S-ZnS/ZIF-8 hollow heterojunction via facile sulphuration and solvothermal methods. This heterojunction was employed as a catalyst for the degradation of tetracycline (TC) in water under UV and visible light irradiation. The physicochemical properties of the as-synthesized catalysts were thoroughly analyzed using XRD, EDS, SEM, BET, XPS, TEM, ESR, UV–vis techniques. The results demonstrate that Ag 2 S-ZnS/ZIF-8 displays enhanced photocatalytic activity for TC degradation no matter under visible or UV light irradiation. After 10 min of UV light irradiation, its photocatalytic degradation efficiency was achieved 92.74 %. Additionally, Ag 2 S-ZnS/ZIF-8 was able to degrade 92.14 % of TC (visible light, with 35 min). The corresponding kinetic rate constant of Ag 2 S-ZnS/ZIF-8 is 0.145 min −1 (UV light) and 0.043 min −1 (visible light), respectively. Furthermore, Ag 2 S-ZnS/ZIF-8 also shown excellent stability for the degradation of TC in the presence of visible light. This is a result of its high specific surface area, superior photocurrent and efficient separation of photo-generated electrons-hole pairs. Apart from this, the photocatalytic degradation mechanism of TC over Ag 2 S-ZnS/ZIF-8 is discussed in detail.
研究领域:
环境科学
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材料科学
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化学
·
纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 16
·7194-7205
·
IF 9.931
Lan Lan,Zhengkang Shi,Qian Zhang,Yuanzhi Li,Yi Yang,Shaowen Wu,Xiujian Zhao
A sample of Co3O4 mesoporous nanorods (Co3O4-MNR) with a considerable number of Co2+ vacancy defects was prepared by a facile method. Co3O4-MNR exhibits highly effective photothermocatalytic activity and excellent durability for the gas-phase oxidation of benzene (a recalcitrant poisonous air pollutant) under UV-visible-infrared illumination from a Xe lamp. It is discovered for the first time that the presence of Co2+ vacancies in Co3O4-MNR massively enhances the photothermocatalytic activity of Co3O4. Compared to a commercial Co3O4 sample (Aladdin) with a smaller number of Co2+ vacancies and TiO2 (P25), the CO2 production rate of Co3O4-MNR is massively increased by 165 and 309 times, respectively. Co3O4-MNR exhibits efficient photothermocatalytic activity for benzene oxidation even under the visible-infrared illumination of λ > 690 nm. The catalytic oxidation of benzene on Co3O4-MNR under the illumination of the Xe lamp follows a mechanism of solar-light-driven thermocatalysis. The experimental evidence of CO-TPR as well as theoretical evidence of density functional theory (DFT) calculations demonstrate that the presence of Co2+ vacancies in Co3O4-MNR significantly increases the activity of the lattice oxygen in Co3O4, thus massively promoting the thermocatalytic activity of Co3O4. Interestingly, a novel photoactivation on Co3O4, quite different from the conventional photocatalysis of semiconductor photocatalysts such as TiO2, is discovered to considerably increase the solar-light-driven thermocatalytic activity of Co3O4-MNR. By combining the experimental evidence of isotope labeling, CO-TPR, and FTIR with the DFT calculations, we obtain a deep insight into the novel photoactivation: the illumination from the Xe lamp enhances the activity of the lattice oxygen in Co3O4-MNR, thus considerably promoting the solar-light-driven thermocatalytic activity of Co3O4-MNR.
研究领域:
催化化学
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材料科学
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环境化学
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纳米技术
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物理化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Lan Chen,Xiaoxiao Wei,Huan Wang,Min Yao,Liming Zhang,Göran Gellerstedt,Mikeal E. Lindström,Monica Ek,Shuangfei Wang,Douyong Min
An ionization difference UV–Vis method ( Δε -spectrum method) is the most potentially simple method for fast quantitation of phenolic hydroxyl groups (ph-OH) in lignin. However, the underestimated results were calculated from the conventional Δε -spectrum method using one- or two-point wavelengths measurement. In this study, a modified Δε -spectrum method using multi-point wavelengths measurement was developed and the negative absorbance was also considered. Four main typical lignin models, e . g . vanilla alcohol, 5-5 biphenyl , stilbenoid and vanillin , were applied as the guaiacyl-type (G-type) phenolic models for the determination of ph-OH by the modified Δε -spectrum method. The 2-methoxyethanol/water/acetic acid = 8/2/0.2 ( V /V/V) was used as the acidic solvent system and the 2-methoxyethanol/0.2 M NaOH solution = 1/9 ( V /V) was used as the alkaline solvent system. The ph-OH contents in the spruce milled wood lignin (SMWL) and the spruce Kraft lignin (SKL) were respectively quantified by the modified Δε -spectrum method as 1.078 and 4.348 mmol/g, which were comparable to the counterparts determined by 31 P Nuclear Magnetic Resonance Spectroscopy ( 31 P NMR). The results revealed that the modified Δε -spectrum method can provide more accurate and reliable results compared to the conventional method.
研究领域:
林产化学
·
分析化学
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DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8
Xuejing Liu,Zhaojun Zheng,Yuanfa Liu
A novel method for determining α, β-unsaturated aldehydes (α, β-UAs) in edible oils was proposed, utilizing 2,4-dimethylpyrrole (2,4-DMP) derivatization followed by UV–vis analysis. The optimal detection wavelengths were identified as 580 nm for α, β-monounsaturated aldehydes (α, β-MUAs) and 680 nm for α, β-diunsaturated aldehydes (α, β-DUAs). The reaction mechanism was confirmed by Fukui function and hydrogen nuclear magnetic resonance ( 1 H NMR) analysis, demonstrating formation of enamine as the final product. Derivatization conditions were optimized for rapid and reproducible results. The proposed method demonstrated excellent sensitivity, with limits of detection (LOD) and quantification (LOQ) for α, β-MUAs at 0.0038 μmol/mL and 0.0117 μmol/mL, and for α, β-DUAs at 0.0043 μmol/mL and 0.0129 μmol/mL, respectively. Compared to the p-anisidine value ( p-AV ) and high-performance liquid chromatography (HPLC) based methods, the proposed method showed several advantages in shorter derivatization time, simplified operation, high throughput potential and lower toxicity. This method provides an efficient tool for α, β-UAs detection, which is crucial for ensuring oil quality and safety.
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产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Jiajing Zhang,Junan Fang,Yaqin Han,Xiaohui Zhu,Qianxi Fan,Jia An,Tingting Xu,Yufei Liu
Accurate trace-moisture detection in organic solvents is crucial for numerous industrial and scientific applications, yet conventional fluorescence sensors often suffer from poor accuracy due to their dependence on environmentally sensitive intensity signals. Herein, we report a wavelength-shifted fluorescence and colorimetric dual-mode sensing strategy, in which moisture variations are reflected by synchronized wavelength shifts of emission and absorption maxima. This strategy employs a novel fluorescent probe, termed λ-probe , whose excited-state behavior is regulated by water-mediated hydrogen bonding. Specifically, as the moisture content increases, both the emission and absorption spectra of the λ-probe exhibit a progressive blue shift, with a shift magnitude of approximately 80 nm. Both emission and absorption peak wavelengths exhibit piecewise-linear relationships with moisture content, enabling dual peak-position quantification over a broad range of 0%–90%. Furthermore, a smartphone-based fluorescence-colorimetric dual-mode sensing platform was developed to achieve rapid on-site quantitative detection. The a* value extracted from fluorescence and colorimetric images using a custom MATLAB program both show linear correlations with moisture content, achieving limit of detections (LODs) of 0.97% and 0.20%, respectively. This work establishes a dual peak-position sensing strategy and provides a smartphone-assisted platform for rapid on-site moisture quantification in highly polar aprotic solvents.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaolong Li,Jundi Wan,Yulu Tang,Chenyu Wang,Yahui Zhang,Dongjun Lv,Mingyuan Guo,Yongning Ma,Yuhao Yang
Navigating more effective methods to enhance the photon utilization of photodetectors poses a significant challenge. This study initially investigates the impact of morphological alterations in 2H-MoS2 on photodetector (PD) performance. The results reveal that compared to layered MoS2 (MoS2 NLs), MoS2 nanotubes (MoS2 NTs) impart a cavity enhancement effect through multiple light reflections. This structural feature significantly enhances the photodetection performance of the MoS2-based PDs. We further employ the heterojunction strategy to construct Y-TiOPc NPs:MoS2 NTs, utilizing Y-TiOPc NPs (Y-type titanylphthalocyanine) as the vis–NIR photosensitizer and MoS2 NTs as the photon absorption enhancer. This approach not only addresses the weak absorption of MoS2 NTs in the near-infrared region but also enhances carrier generation, separation, and transport efficiency. Additionally, the band bending phenomenon induced by trapped-electrons at the interface between ITO and the photoactive layer significantly enhances the hole tunneling injection capability from the external circuit. By leveraging the synergistic effects of the aforementioned strategies, the PD based on Y-TiOPc NPs:MoS2 NTs (Y:MT-PD) exhibits superior photodetection performance in the wavelength range of 365–940 nm compared to MoS2 NLs-based PD and MoS2 NTs-based PD. Particularly noteworthy are the peak values of key metrics for Y:MT-PD, such as EQE, R, and D* that are 4947.6%, 20588 mA/W, and 1.94 × 1012 Jones, respectively. The multiperiod time-resolved photocurrent response curves of Y:MT-PD also surpass those of the other two PDs, displaying rapid, stable, and reproducible responses across all wavelengths. This study provides valuable insights for the further development of photoactive materials with a high photon utilization efficiency.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）