Journal of Food Measurement and Characterization
·
2023
·Vol. 18
·期 3
·1734-1739
·
IF 3.4
Hao Lingchuan,Xu Wenxue,Wu Minghuo
Proanthocyanidins (PCs), known as natural antioxidants capable of scavenging free radicals, are rich in blueberry as oligomeric proanthocyanidins (OPCs). Aim to efficiently determine the total PCs in blueberry, a simple method of dispersive solid phase extraction (DSPE) followed by UV–Vis spectrophotometry detection was developed, in which C18-bonded silica microspheres were used as absorbent to purify the targets, and vanillin–HCl was applied for chromogenic reaction. After systematic optimization of DSPE conditions, reliable determination of total PCs was achieved. Though the sensitivity of this method was not comparable to those based on high performance liquid chromatography or mass spectrometry, it was simple and reliable for the analysis of PCs-rich fruits. With this method, impacts of storage conditions including time and temperature, as well as the freshness on total PCs concentration in blueberry were investigated. The results revealed that with the increase of storage time or temperature, the total PCs decreased accordingly. Meanwhile, the highest concentration of total PAs was found in the freshest blueberries stored at a low temperature of 4 °C, which supported that the low temperature was favorable for blueberry storage, showing the practical significance for the storage of PCs-rich fruits.
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Journal of Energy Storage
·
2024
·
IF 8.9
Jian Ma,Yueyue Wu,Lei Dong,Mengyue Yu,Zhendong Zhu,Le Zhang,Linchao Zhang,Hongfa Xiang
Cathode–electrolyte integration via in-situ polymerization is an effective strategy to reduce interfacial resistance in solid-state/quasi-solid-state lithium batteries ; however, ion conduction in the fraction of polymer electrolyte is still to be enhanced. Herein, we demonstrate a separator-free cathode–electrolyte integrated structure employing a novel poly(di(ethylene glycol) ethyl ether acrylate)-based quasi-solid polymer electrolyte (LiTFSI-poly(DEGA)-FEC QSPE, denoted as PDEGA-QSPE), prepared via UV-assisted in-situ polymerization. Poly(DEGA) as a linear polymer contains abundant ethylene oxide (EO) segments in its branched chain, exhibiting excellent flexibility and high adhesion. Benefited from the flexible molecular structure, PDEGA-QSPE exhibits a glass transition temperature ( T g ) as low as around −68 °C and a good room-temperature ionic conductivity of 2.3 × 10 −4 S cm −1 , and it also shows an oxidative potential up to 4.7 V. The LiFePO 4 |PDEGA-QSPE|Li battery possesses an initial capacity of 149.2 mAh g −1 and a capacity retention of 92.5 % after 300 cycles at 0.2 C under room temperature, and poly(DEGA)-based QSPE also has the potential to be applied to the high-voltage NCM811||Li battery. Compared with widely-employed monomers for in-situ polymerization such as poly(ethylene glycol) diacrylate (PEGDA), poly(DEGA) possesses remarkably improved flexibility and ion conduction capability, exhibiting broad research and application prospects.
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ChemElectroChem
·
2020
·Vol. 7
·期 12
·2599-2607
·
IF 4.154
Zhuang Yang,Yingwu Luo,Xiang Gao,Rui Wang
Graphical Wearable ASSLIB : In situ polymerization on the electrode can enhance the adhesion between the electrode and the electrolyte, resulting in enhanced cycle and rate performance of all-solid-state lithium-ion batteries (ASSLIBs). The development of wearable electronic devices prompts the demand for high-safety all-solid-state lithium-ion batteries (ASSLIBs), which can work at ambient temperature with comparable performance to traditional commercial lithium-ion batteries. In this work, a three-dimensional network design to overcome the contradiction between ionic conductivity and mechanical strength in polymer electrolytes is proposed. The designed solid polymer electrolyte (SPE) has the ion-conducting group (oligomeric ethylene oxide) fixed on the side chains, whereas the main chain is crosslinked polyacrylate, providing good mechanical strength. Succinonitrile (SN) is uniformly dispersed in the cross-linked network as an additive. The prepared SN−SPE shows a high ionic conductivity of 4.6×10 −4 S cm −1 at 25 °C with a Li + -ion transference number of 0.45 and an excellent electrochemical stability window up to 4.6 V (vs. Li + /Li). The preparation method allows that the electrolyte can be UV-cured in situ on the cathode to achieve a cathode-electrolyte integrated electrode, which enhances the interface contact and decreases the interface resistance. As-fabricated LiFePO 4 //Li 4 Ti 5 O 12 cathode-electrolyte integrated ASSLIBs can deliver a discharge capacity of 155.88 mAh g −1 at 0.2 C at room temperature and a capacity retention up to 93.62 % after 100 charge-discharge cycles. The reported polymer electrolyte and advanced assembly process provided a promising strategy for the wearable ASSLIBs.
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APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Xuan Wang,Hao Ding,Zhuoqun Xu,Jianmeng Zhang,Yanbin Yao
To enhance the anti-aging property of a superhydrophobic self-cleaning coating, rutile nano-TiO 2 was loaded onto the surface of sericite via wet grinding method to prepare sericite-rutile composite particles. Then, the composite was modified with hexadecyltrimethoxysilane (HDTMS) and sprayed onto the substrates surfaces to prepare sericite-rutile/HDTMS composite coatings with both UV shielding and superhydrophobic self-cleaning properties. The structure, properties, and mechanism of the coating were studied. The research showed that the micro-nanoscale hierarchical structure has been constructed by compositing sericite and rutile, which were the structure foundation of superhydrophobic coatings. The sericite-rutile composite was modified with HDTMS and sprayed onto the substrates forming a superhydrophobic self-cleaning coating. Water contact angles (WCAs) and slide angles (SAs) of the coating were 155.3° and 1.3°, respectively. The sericite-rutile/HDTMS coating exhibited good UV shielding and anti-aging properties. Its UV shielding rate was 93.53%, which was equivalent to that of pure rutile (94.27%). After UV irradiation for 80 h, the surface maintained superhydrophobicity, and the chromaticity of the coating surface did not change. The superhydrophobicity and low adhesion to water of the sericite-rutile/HDTMS coating are due to the micro-nano hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS. The UV shielding effect of the coating is mainly due to the strong absorption of UV light by the sericite-rutile composite. This work provides a simple and environmentally friendly method for constructing a coating with UV shielding and superhydrophobic self-cleaning properties.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jiafeng Ding,Gaoyuan Long,Yang Luo,Runze Sun,Mengxia Chen,Yajun Li,Yanfang Zhou,Xinhua Xu,Weirong Zhao
Polychlorinated dibenzo- p -dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo- p -dioxin (2-CDD) over Pd/g-C 3 N 4 catalysts under UV–vis irradiation. The g-C 3 N 4 and a series of Pd/g-C 3 N 4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV–vis DRS analyses. Among all the samples, the Pd/g-C 3 N 4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo- p -dioxin (DD). The kinetics of dechlorination could be described as pseudo-first-order decay model (R 2 > 0.84). Corresponding rate constants (k) increased from 0.052 to 0.17 h −1 with Pd contents up to 5 wt% and decreased to 0.13 h −1 with a 10 wt% of Pd. The enhanced activities originated from the surface plasmonic resonance (SPR) effect of Pd nanoparticles and the formation of Schottky barrier between Pd and g-C 3 N 4 , which extend the spectrum responsive range and suppress the charge recombination of g-C 3 N 4 . This is the first report on the photocatalytic reductive removal of PCDDs and may provide a new approach for PCDDs pollution control.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 22
·7397-7405
·
IF 4.174
Jie Chen,Yixin Gao,Haifeng Jiang,Yan Liu,Zhaohui Jin
Optimizing structure and varying doped ions are two main strategies to obtain excellent luminescence performance. Spherical morphology is considered to be the most ideal phosphor structure due to the least surface defects. Herein, a series of spherical and monodispersed Dy3+/Eu3+ co-activated SiO2@Gd2O3 core–shell phosphors with multicolor tunable luminescence were successfully prepared via a facile urea assisted precipitation method. Related chemical reactions and the possible growth mechanism of Gd2O3:Ln3+ directional deposition on the surface of SiO2 microspheres were put forward. Upon 273 nm UV radiation excitation, SiO2@Gd2O3:Dy3+ and SiO2@Gd2O3:Eu3+ samples exhibited characteristic yellow (4F9/2–6H13/2) and blue (4F9/2–6H15/2) emissions of Dy3+ and red (5D0–7F2) emission of Eu3+, respectively. Meanwhile, multicolor emissions (warm white, yellow and orange) could be easily obtained by modulating the relative content of Dy3+ and Eu3+ in SiO2@Gd2O3:Ln3+ samples under a single excitation wavelength. Moreover, it was confirmed that Dy3+ could transfer energy to Eu3+ in the form of quadrupole–quadrupole interaction and further improved the luminescence intensity of Eu3+ by comparing experimental data with theoretical calculations. These results imply that tunable luminescence Dy3+,Eu3+ co-doped SiO2@Gd2O3 microspheres have great potential applications in multicolor displays and biolabeling fields.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Siyuan Tang,Da Chen,Changxing Wang,Yongsheng Yang,Xiameng Li,Tingting Li,Xiaohong Zhang
Nitrogen and sulfur co-doped graphene quantum dots (N, S-GQDs) are prepared by using o-phenylendiamine and catechol as raw materials under UV irradiation in dimethyl sulfoxide (DMSO) solution for 2 h. The resultant N, S-GQDs show uniform size, good crystallinity and fluorescence stability. The tunable polychromatic luminescence is obtained by adjusting the concentration of N, S-GQDs. Then, N, S-GQDs/HPMC composite material is designed and synthesized, which exhibits light responsive optical switching performance owing to micro-aggregation efficacy of N, S-GQDs to transform light into heat and drive the phase transition of hydroxypropyl methyl cellulose (HPMC). Therefore, the prepared N, S-GQDs/HPMC with excellent solar modulation ability can easily switch between opaque and transparent states depending on weather condition. In the end, the thermoresponsive property of N, S-GQDs/HPMC endows it with good performance as functional materials matrix.
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INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2025
·
IF 5.2
Dan Liu,Yaokun Pang,Shenrui Pan,Jianxia Sun
More attention has been paid to developing new antibacterial drugs from natural products due to antibacterial resistance. Ferulic acid (FA) is a natural phenolic acid with demonstrated antimicrobial effects. However, its bactericidal activity is insufficient to achieve a rapid bacteria reduction in a short time. This study demonstrates the antimicrobial activity and synergistic interaction of FA in combination with ultraviolet A (UV-A) against Escherichia coli (E. coli) . The synergistic activity against E. coli was concentration and time-dependent. A set of associated changes in cellular functions of E. coli including membrane integrity, cell membrane permeability and DNA damages were measured. Morphologically, the treated cells exhibited a bacterial membrane and DNA dysfunction. Furthermore, the photostability and photochemical pathway of FA upon UV-A exposure was investigated. A rapid photochemical degradation of FA upon UV-A irradiation was observed due to the photoisomerization process of FA. Type II reaction was assumed as the main photochemical pathway as evidenced by the actions of different quenching agents. Antibacterial activity of FA + UV-A was also tested on chicken breast meat. A reduction of the loads of E. coli bacteria on chicken and good maintenance of its quality was achieved. This combination of methods helps to reduce the use of chemical food preservatives and provide new ways to control pathogenic microorganisms in food industry.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Xinhan Chen,Gaofan Chen,Ya-Nan Feng,Lizhen Zhang,Yan Yu,Lingyun Li
Developing single-component white-light phosphors remains challenging due to the difficulty in achieving dual emission from mixed-valent activators. Herein, we present a carbon-modulated reduction synthesis (CARS) method to fabricate Eu2+/Eu3+ co-doped La3Si2O8Cl (LSOCl) phosphors without requiring hazardous reducing atmospheres. By modulating carbon content (Eu : C = 1 : 0–2.4), the Eu2+/Eu3+ ratio is effectively controlled, enabling tunable emission from pink to white and yellow under 365 nm UV excitation. The optimized LSOCl:7%Eu (Eu : C = 1 : 1.9) exhibits broadband emission (390–720 nm) with a high color rendering index (Ra = 85.05), cool white light (5489 K, CIE: 0.33, 0.38), and stable performance under varying currents. Additionally, LSOCl:7%Eu (Eu : C = 1 : 1.4) shows excitation-dependent chromaticity shifts: minimal changes under solar-blind UV (250–280 nm) but dramatic variations at 280–350 nm, facilitating rapid detection. A solar-blind UV detector was designed, demonstrating fast response, high resolution (50% CIE shift at 330 nm), and anti-interference capability. The CARS method offers an eco-friendly, scalable route for dual-emission phosphors, showcasing their dual utility in high-quality white LEDs and sensitive UV detection technologies.
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Environmental Technology & Innovation
·
2022
·
IF 7.758
Xinran Zhang,Pengfei Ren,Jianhua Zhou,Junyi Li,Zhenxing Li,Ding Wang
This study investigated the formation of disinfection byproducts (DBPs) from a real ammonia-polluted source water treated by a pilot-scale ultraviolet (UV)/chlorine process with subsequent post-chlorination. The experimental results indicated that UV/chlorine treatment enhanced the formation of trihalomethanes (THMs), haloacetic acids (HAAs), and haloacetonitriles (HANs) in post-chlorination, compared to UV or chlorine applied alone under parallel experimental conditions. DBP formation was observed to depend on pH values, chlorine doses, and reaction times. THM formation was higher at pH 9.0 than pH 6.0, while HAAs and HANs were produced more readily at pH 6.0 rather than 9.0. A higher chlorine dose led to a higher amount of DBPs formed after the treatment of UV/chlorine followed by post-chlorination. The concentration of DBPs increased with the UV/chlorine treatment time increasing from 2 to 15 s and then presented a decrease trend with the reaction time prolonging to 30 s. In addition, changes in natural organic matter (NOM) properties were evaluated using three-dimensional fluorescence spectra and parallel factor analysis (PARAFAC) UV/chlorine treatment effectively destroyed humic-like and tyrosine-like components in waters with the maximum fluorescence intensity ( FI m a x ) reduced by 51.4% and 64.6%, respectively, compared to the raw water sample. The decrease of fluorescence of waters exhibited a positive correlation with the formation of DBP-FP in UV/chlorine treatment. Overall, DBP formation from the ammonia-polluted source water caused by UV/chlorine treatment could be managed by carefully determining chlorine doses and contact times to be used in the UV/chlorine process.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dongmei Liu,Yu Xiong,Hui Zeng,Jin Xu,Biyu Tang,Yan Li,Min Zhang
Background Capillary electrophoresis (CE) with capacitively coupled contactless conductivity detection (C 4 D) is widely used for water quality monitoring. However, there is currently no reported CE method for detecting total dissolved nitrogen (TDN), a crucial parameter for assessing water eutrophication . One challenge is the high sulfate concentration (100 mM) introduced during persulfate digestion, leading to overlap of nitrate (from TDN) and poor electrical stacking of nitrate in CE-C 4 D analysis. Results We introduced an in-capillary UV-LED induced photoreaction to convert nitrate to nitrite, which can be baseline-separated from sulfate via the CE method, enabling accurate quantification of nitrate concentration derived from nitrite. A 2 nL post-persulfate digested sample solution within a fused silica capillary was exposed to UV-LED irradiation at the capillary tip. Subsequently, photoreduction-produced nitrite was electrophoretically separated from sulfate in an acidic buffer (pH = 3.7) within the same capillary, followed by contactless conductivity detection. The nitrate-to-nitrite conversion efficiency was influenced by irradiation wavelength, power, and duration, reaching a maximum efficiency of 77.4% when employing two 230 nm LEDs for 5 min. For more general applications, two 255 nm LEDs were used, providing a conversion efficiency of (66.4 ± 3.3)% ( n = 11) for 5 min of irradiation. The proposed CE-C 4 D method exhibits a detection limit of 13 μM (0.18 mg N/L) and has been successfully employed for TDN determination in lake water samples. Significance This innovative approach not only enhances the attractiveness of the CE-C4D method for the determination of water quality indicators but also highlights the potential for integrating deep-UV LEDs into environmental analysis .
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PubMed
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Xueying Shan,Qixin Huang,Jiao Gao,Hanchao Liu,Jingru Wang,Jinchun Li
Epoxy resin (EP) coating is characterized by high flammability, low resilience, and a pronounced susceptibility to aging. In this study, a novel chitosan-based Schiff base derivative flame retardant, STLCP, was synthesized using tert -butyl dimethyl chlorosilane, syringaldehyde, and DOPO as raw materials, with chitosan as the basic skeleton. The resulting EP/STLCP composites had excellent flame retardancy, UV shielding, and high toughness. The incorporation of only 1 wt % STLCP can effectively suppress the risk of combustion-induced melt dripping in EP. At a 6 wt % loading, the EP composite attained a UL-94 V-0 classification and an LOI of 32.3 %. In addition, the EP/STLCP-6 % composite demonstrated reductions of 46.3 %, 12.8 %, and 14.8 % in total heat release (THR), peak heat release rate (PHRR), and smoke production rate (SPR), respectively, when compared with pure EP. Flame retardant mechanistic analysis revealed that adding STLCP notably enhanced the char layer's graphitization degree, diluted combustible gas concentrations, and contributed synergistically to flame retardation in both the condensed and gas phases. In addition, STLCP exhibited the excellent UV aging resistance to EP, as the T UVA and T UVB transmittance values were reduced to below 3 %. Regarding mechanical properties, STLCP improved the tensile strength and impact toughness of EP by up to 43.3 % and 40.0 %, respectively, and improved the elongation at break by 24.6 %. Moreover, the EP/STLCP composite was shown to possess excellent thermal conductivity. This work is expected to provide a promising strategy developing green, eco-friendly, and multifunctional EP composites.
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