International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 8
·7066-7075
·
IF 1.5
Jiheng Ding,Hongran Zhao,Lin Gu,Shengpei Su,Haibin Yu
This paper reports the synthesis of waterborne epoxy phosphate emulsion (WEP) through the reaction between epoxy resin E44 and phosphoric acid and ammonia neutralization. Synthesized WEP was characterized by FTIR for the confirmation of reaction between epoxy groups and phosphoric acid and SEM for morphology. WEP acted as a modifier in two-component epoxy anticorrosion coating on rusty steel substrate. The anticorrosion properties of the coating on rusty steel were investigated by electrochemical impedance spectroscopy (EIS) and Tafel polarization curve. Tafel polarization curve revealed that waterborne epoxy coating containing WEP had better protection ability which is clearly reflected by the protection efficiency (96.6%). EIS study also showed the higher impedance value for WEP containing coating as compared to pure waterborne epoxy coating.
研究领域:
材料科学
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腐蚀与防护
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高分子化学
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表面工程
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电化学
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DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
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2025
·
IF 3.3
Hanqin Weng,Baoying Zhang,Yizhi Chen,Shinichi Yamashita,Yusa Muroya,Hao Yu,Xinrui Zhang,Xiaofan Yang,Weiqun Shi
The ligand of 2,9-Diamide-1,10-phenanthroline (DAPhen), developed for group actinide separation in the past decade, showed excellent extraction and separation performance for various actinides from trivalent lanthanides. However, its radiolysis mechanism remains unclear, restricting its application. Mechanism for the radiolysis of three different DAPhen in 1-octanol was studied by pulse radiolysis, of which the results demonstrated that reductive degradation was the main route of their radiolysis in 1-octanol. Solvated electrons (e sol − ), and α-hydroxyoctyl radicals have been recognized as the most important transient species responsible for DAPhen radiolysis. Rate constants for the reactions of e sol − with N,N′ -diethyl- N,N′ -ditethyl-2,9-diamide-1,10-phenanthroline (Et–Et-DAPhen, EED), N,N′ -dioctyl- N,N′ -ditoctlyl-2,9-diamide-1,10-phenanthroline (Oct-Oct-DAPhen, OOD), and N,N′ -diethyl- N,N′ -ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen, ETD) were estimated to be 1.9 × 10 9 , 2.3 × 10 9 , and 1.5 × 10 9 L mol −1 s −1 , respectively. Those of α-hydroxyoctyl radicals with EED, OOD, and ETD were approximately 1.1 × 10 8 , 2.1 × 10 8 , and 2.7 × 10 8 L mol −1 s −1 , respectively. The studied DAPhen exhibited high reactivity with e sol − , and α-hydroxyoctyl radicals in 1-octanol, resulting in their vulnerability under irradiation. A versatile strategy was accordingly proposed to enhance their radiation stability based on the insights into transient processes of DAPhen radiolysis. If the HNO 3 -equilibrated organic phase was saturated with nitrous oxide (N 2 O), the reductive species responsible for DAPhen degradation would be scavenged. As a consequence, the radiation-resistance of DAPhen was significantly improved because the key elementary reaction of radiolysis was inhibited by the synergetic effect of N 2 O and HNO 3 .
研究领域:
放射化学
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配体设计
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核化学与技术
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Guanghou Wang,Xueqian Tang,Feixu Qin,Hongjin Wang,Hao Zhang,Hanyue Li,Lan Wei,Lixin Sun
Nauclea officinalis ( N. officinalis ), a medicinal plant of the genus Nauclea in the Rubiaceae family, is used to treat bronchitis, pneumonia and acute tonsillitis and enteritis in China. Extracts of N. officinalis include more than 60 alkaloids, which exert all kinds of pharmacological effects, such as antiproliferative, antiparasitic, antimicrobial, anticancer, and anti-inflammatory activities. In this study, an affinity ultrafiltration and high-performance liquid chromatography- tandem mass spectrometry (AUF-LC-MS/MS) approach was constructed and validated, and was applied to rapidly screen COX-2/5-LOX inhibitors in N. officinalis extracts (NOE). To gain a more comprehensive and profound understanding of the anti-inflammatory mechanism of N. officinalis . Central Composite Design (CCD) of Response Surface Method (RSM) was used to optimize extraction conditions for potential COX-2/5-LOX inhibitors from NOE. Next, COX-2/5-LOX dual targeted inhibitors were screened from NOE using AUF-LC-MS/MS, and the biological activity of the screened ligands was demonstrated by enzyme inhibition assay. Finally, the preferred binding modes for these COX-2/5-LOX inhibitors were then determined by molecular docking, and compared with active drugs celecoxib and zileuton, respectively, to further explore ligand active binding sites and intersections between ligands and target proteins. The optimum extraction conditions were follows: ethanol concentration of 79 %, liquid − solid ratio of 11.8 v / w and extraction time of 1.8 h. The results of COX-2 inhibition assay showed that angustine (AU) had the more stronger inhibition activity with an IC 50 of 20.49 μM, followed with IC 50 of angustidine (AD) and nauclefine (NF) were 35.89 and 60.45 μM, respectively. Among the three components, AU also exhibited the highest inhibition of 5-LOX with an IC 50 of 1.18 μM, followed by NF and AD at 2.75 and 4.35 μM, respectively. Owing to the synergistic effect of multiple components make NOE exhibit strong inhibitory activity, it is shown potent inhibitory activities with an IC 50 at 9.47 and 6.16 μg/mL for COX-2 and 5-LOX, respectively. This work has demonstrated that NF, AD, and AU are potential COX-2/5-LOX dual-target inhibitors, indicating that N. officinalis anti-inflammatory activities were partially based on these COX-2/5-LOX inhibitors. These research results can also be further used for developed or improved anti-inflammatory agents with more beneficial effects.
研究领域:
药理学
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药物化学
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植物科学
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分析化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Runnan Zhang,Yanyan Liu,Wanqi Ou,Yuying Ye,Kai Xu
Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants that are widely present in aquatic environments and pose a significant threat to the ecological environment and human health. This study introduces a novel magnetic biochar-supported metal oxide catalyst (CeO 2 /BC@Fe 3 O 4 , CBF) as a peroxymonosulfate (PMS) activator in phenanthrene (PHE) degradation in aqueous environments. The degradation performance of the CeO 2 /BC@Fe 3 O 4 composite material was investigated through degradation experiments. The results showed that under the optimal reaction conditions, the degradation efficiency of 20 mg/L PHE solution within 60 minutes could reach 99.55% and maintained stability within a wide range of pH values. Radical quenching and EPR studies confirmed the involvement of SO 4 ·- , ·OH and 1 O 2 in the removal of PHE during the degradation process. The possible degradation pathways were proposed based on the identification of intermediates. The catalyst demonstrated excellent reusability and was effective in real water samples and for other organic pollutants, highlighting its potential for practical environmental applications.
研究领域:
环境科学
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催化化学
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水处理
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污染物降解
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kaixin Li,Xin Yang,Juntao Gao,Yingshuang Guo,Yixuan Wang,Yu Zou,Zhikang Li,Zhe Lü
An in-depth comprehension of the structural characteristics of perovskite and the response mechanisms is crucial for designing materials with excellent properties. Here, the performance of several kinds of Sr 0.75 Pr 0.25 Fe 1-x Co x O 3-δ (x = 0, 0.25, 0.5, 0.75, 1) in an alkaline environment was thoroughly examined. Sr 0.75 Pr 0.25 Fe 0.25 Co 0.75 O 3-δ displayed the lowest overpotential (337 mV @ 10 mA·cm −2 ) and Tafel slope (69.3 mV·dec −1 ) in 0.1 M KOH and possessed excellent performance in zinc-air batteries. Cobalt doping encourages the positive shift of the O 2p band center, boosting the number of electrons around the Fermi energy level and delivering an increase in conductivity, according to DFT and experimental studies. Compared to Sr 0.75 Pr 0.25 FeO 3-δ , the rate-limiting step of Sr 0.75 Pr 0.25 Fe 0.25 Co 0.75 O 3-δ changes from OH*→O* deprotonation to OH* adsorption, which significantly decreases the energy potential barrier during OER process. The A/B site doping method is universal and facile, which is essential to comprehend and develop effective perovskite oxide for zinc-air battery electrodes.
研究领域:
材料化学
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电化学
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能源材料
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催化科学
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固态离子学
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表面科学
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纳米材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Qi Xiao,Dandan Guo,Jing He,Min Zhang,Shan He,Shaohua Huang
Background In reversed-phase liquid chromatography , the C 18 alkyl bonded phase, as the primary stationary phase, is widely used in pharmaceutical and food analysis . The phenyl bonded phase often serves as a complementary choice to the C 18 phase to enhance the separation performance of specific categories of compounds. However, both C 18 and the currently available phenyl bonded phase chromatography columns show room for further optimization in improving the separation efficiency of specific compound classes, such as dihydroflavonoids. Additionally, the potential role and impact of introducing phosphorus groups into chromatographic stationary phases have not been fully explored, indicating a promising direction for research. Results In the present work, we prepared a novel phenyl stationary phase by bonding 9-oxa-10-phosphaphenanthrene 10-oxide onto silica gel . The obtained material was characterized by scanning electron microscopy, fourier transforms infrared spectroscopy , and elemental analysis . The results show that 9-oxa-10-phosphaphenanthrene 10-oxide was successfully bonded on the silica surface with a load of 3.90 %. Further chromatographic characterization in high-performance liquid chromatography exhibited high column efficiency (40,792 plates m-1 for the determination of biphenyl) and good stability (RSD of 0.28 %∼5.38 %). Moreover, we made a detailed study of the column separation mechanism by nuclear magnetic resonance spectroscopy titration experiment. Comparing to commercial phenyl column, the proposed stationary phase showed shorter retention time and higher throughput. In addition, the stationary phase has a strong ability to separate multiple types of compounds, which provides a new strategy for the separation of complex samples, such as active ingredients in traditional Chinese medicine . Significance We have developed a novel phenyl column and conducted a comprehensive examination of its chromatographic performance, demonstrating excellent separation capabilities and high efficiency for both nonpolar and moderately polar aromatic compounds . Additionally, we explored the impact of phosphorus-containing groups on the separation performance of chromatographic stationary phases.
研究领域:
分析化学
·
药物分析
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DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 23
·4583
·
IF 4.6
Ting Zhang,Jiale Song,Zhenzhen Peng,Mengjiao Wu,Zhi Li,Fei Li,Yuxi Wei
Polysaccharides from marine organisms have been extensively studied and utilized as functional food ingredients due to their excellent immunomodulatory properties. However, the immunomodulatory potential of fermentedRuditapes philippinarumpolysaccharide (RPP) has not been systematically explored. This study investigated the effects of RPP on immune function in cyclophosphamide (CTX)-induced immunosuppressedBALB/cmice. These results revealed that RPP alleviated CTX-induced weight loss and restored appetite. Moreover, RPP can promote the morphology and indices of immune organs, as well as increased the number of white blood cells (WBC), red blood cells (RBC), and hemoglobin (Hb). Serum levels of interleukin-6 (IL-6) and immunoglobulin E (IgE) were significantly elevated following RPP treatment. Additionally, RPP improved colonic morphology by upregulating the expression of E-cadherin and ZO-1 and promoting the secretion of secretory IgA (sIgA). These results indicated that RPP exerted an immune protective effect inBALB/cmice and justified its further potential as a bioactive ingredient for functional foods derived from marine shellfish.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yi Zhao,Meiyu Yan,Liru Jia,Fengfeng Zhang,Leiming Sun,Cijian Zhang,Chengwen Gu,Beitao Liu,Qianqian Fan,Shouhai Zhang,Xigao Jian,Zhihuan Weng
Epoxy resins play a vital role in anticorrosion coatings, however, the defects of poor flexibility and thermal stability of epoxy resin hinder their use in extreme environments and limit the wide range of applications for epoxy coatings. This study investigates the incorporation of high-performance thermoplastic poly(phthalazinone ether) resins (PPAEs) into bisphenol A epoxy resins (E-51) to develop a series of high performance anti-corrosion coatings. Due to the distinctive structure of the phthalazinone moiety, the flexibility and thermal stability of the epoxy coatings were greatly improved by the addition of PPAEs. The flexibility test result was reduced from over 7.5 mm to 5 mm, while the glass transition temperature ( T g ) of the coating was stabilised above 180 °C. In addition, inorganic fillers are added to plug defects such as pores inherent in epoxy coating systems. The coating provided more than 1,560 h of protection in the neutral salt spray test. At the same time, the coating maintained a high impedance modulus of 10 9 Ω⋅cm 2 (|Z| 0.01Hz ) after 4 weeks of immersion in electrochemical impedance tests. This study significantly enhances the comprehensive performance of epoxy coatings and provides a viable solution for the development of high performance epoxy anti-corrosion coatings, offering promising alternatives for corrosion protection in extreme service environments.
研究领域:
材料科学
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高分子科学
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表面工程
·
腐蚀防护
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuan Ma,Chunhong Li,Muhammad Aizaz Ud Din,Lan Zhao,Nengcong Pan,Yuhan Lei,Nanpu Cheng
Affordable and highly effective electrocatalysts are essential for achieving industrial-scale hydrogenation of water applications. The successful fabrication of Fe-doped CoSe 2 nanosheets supported on nickel foam (Fe x -CoSe 2 /NF) via a two-step electrochemical deposition method is presented in this study, showing their effectiveness as an electrocatalyst for the oxygen evolution reaction (OER) in water splitting. The performance of Fe x -CoSe 2 /NF initially improves with increasing x, reaching an optimal value before subsequently declining. The ideal catalyst, Fe 0.75 -CoSe 2 /NF, requires a low overpotential of 256 mV at 10 mA cm −2 , and even at 100 mA cm −2 , the overpotential remains as low as 291 mV. The catalyst also displays a low Tafel slope of 34.37 mV dec −1 , highlighting the fast OER kinetics. Furthermore, Fe 0.75 -CoSe 2 /NF demonstrates exceptional electrochemical stability. The enhanced OER catalytic performance of Fe-doped CoSe 2, compared to intrinsic CoSe 2, is attributed to the thinner nanosheets structure and optimized electronic structures, which provide a higher density of active sites and facilitate a new reaction coordination with a lower energy barrier during the OER process. These findings not only offer new mechanistic insights into Fe-doped CoSe 2 systems but also provide a scalable and cost-effective pathway for designing next-generation, non-precious-metal-based electrocatalysts.
研究领域:
电化学
·
纳米材料
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催化
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能量转换
·
材料科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yu-Zhen Zhang,Yi-Le Li,Zhi Jin,Mao-Fang He,Yi-Mei Tang,Jian Zhang,Bo Zhang
Flemingia philippinensis Merr.et Rolfe ( F. philippinensis ) is an important food ingredient as well as a traditional Chinese medicine with numerous pharmacological actions. Unfortunately, there was no defined method for monitoring the quality of F. philippinensis in the Chinese Pharmacopoeia. In this study, a magnetic covalent organic framework molecularly imprinted polymers (MCOFs-MIPs) was prepared using MCOFs as a support material, genistein (Gen), which was abundant in F. philippinensis , as a template molecule, and acrylamide as a functional monomer. The preparation process of MCOFs-MIPs was optimized and their structures and adsorption characteristics were characterized. In the selectivity test, the imprinting factor of Gen was 1.93, demonstrating that the imprinting effect of MCOFs-MIPs could selectively enrich Gen in complex samples. Following that, a new and effective quality control method (Gen-MCOFs-MIPs-HPLC) was established to determine Gen content in F. philippinensis roots. The method showed good linearity (R 2 = 0.9936) in the range of 0.12–80 µg mL −1 . The recoveries of Gen in F. philippinensis high, medium and low samples were 90.5–91.0 %, 92.1–100.1 and 92.8–100.8, respectively. Stability and reproducibility tests revealed that this method was stable (RSD of 1.20 %) and reproducible (RSD of 0.70 %). Moreover, the calculation showed that the amount of Gen in the F. philippinensis powder was 0.4489 mg g −1 . As a result, the approach was shown to be simple, repeatable, and stable, and it provided a sensitive and reliable method for the extraction and detection of Gen in natural products.
研究领域:
植物化学
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药物分析
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食品科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Lili Xiao,Biwei Wang,Li Ji,Fu Wang,Qunhui Yuan,Guangzhi Hu,Angang Dong,Wei Gan
Recently, ordered mesoporous carbon has displayed attractive performance in electrochemical catalysis and sensing, benefiting from its rich and tunable pore texture. In this work, a novel electrochemical sensor based on a three-dimensionally interconnected mesoporous graphene framework (MGF) was developed for simultaneous determination of Cd(II) and Pb(II) in aqueous solution. Attributable to the abundant three-dimensional mesopores and good electrical conductivity of MGF, as well as the synergistic effect of Nafion and in-situ plated bismuth films, a highly sensitive determination of mixed metals at a Bi/MGF-Nafion/GCE is achieved. The proposed sensor exhibits wide linear responses for Cd(II) and Pb(II), ranging from 2–70 μg L −1 and 0.5–110 μg L −1 , respectively. The detection limits are about 0.5 and 0.1 μg L −1 for Cd(II) and Pb(II), respectively, which are about 6 and 100 times lower than the drinking water standards set by the World Health Organization (WHO). Moreover, Bi/MGF-Nafion/GCE has been applied for the detection of mixed metals in real water samples. The satisfying recoveries (87.5-109.2%) and relative standard deviations (RSD, 3.7-8.6%) make the proposed electrode a promising candidate for rapid and on-site monitoring of environmental metallic pollutants.
研究领域:
环境科学
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材料科学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2015
·
IF 1.602
Qianmin Ma,Qianming Wang
The synthesis and spectroscopic features of 1,4-bis([1,10] phenanthroline-[5,6-d] imidazol-2-yl) benzene (BPIB) with its europium (III) complex have been described. Characteristic red emissions can be achieved upon the excitation at 369 nm. This compound exhibited ultraviolet absorption shifts as well as fluorescence emission quenching upon exposure to Cu 2+ ions. Hence, it can be utilized as a responsive copper sensor in terms of double routes including naked-eye observation and fluorescent probing. In the case of anions, this sensor could be used for direct determination of F − in DMSO through fluorescence signal changes with satisfied results.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）