NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 8
·6274-6282
·
IF 3.201
Shuang Chen,Hao Wu,Jing-han Hua,Jing-wen Yang,Hong-bin Zhang,Xue-qin Hu
Dextran is a polysaccharide with a high medicinal value. Thus, the chemical modifications of dextran, and the structural and physicochemical properties of its derivatives should be given focus. Dextran (Mw 5000 Da to 7500 Da) can complex with iron. In this study, dextran (Mw 5400 Da) was modified at different pH levels (8–14) by using NaOH and NaClO/NaBr. The carboxyl groups of the modified dextran were determined using infrared spectroscopy, and the carboxyl contents were compared. The results of high-performance liquid chromatography indicated that dextran was degraded during the modification. The crystallization and the structure of the carboxyl-modified dextran were investigated using X-ray diffraction, nuclear magnetic resonance, and quadrupole time-of-flight mass spectrometry. The physicochemical properties, i.e., solubility, and granule morphology, of the carboxyl-modified dextran were carefully characterized and compared. This work provides a theoretical foundation for the accurate selection of carboxyl-modified dextran and the development of a novel strategy for the preparation of metal complexes.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Sujie Shan,Wei Wang,Dongmei Liu,Zhiwei Zhao,Wenxin Shi,Fuyi Cui
Owing to the twin problems of eutrophication and global phosphorus (P) scarcity, the removal and recovery of phosphate from water and wastewater have received increasing attention. Herein, magnetically recyclable La 2 O 2 CO 3 /γ-Fe 2 O 3 adsorbents were rationally designed by derivation from La/Fe binary metal organic framework (MOF) precursors via calcination treatment. Based upon preliminary screening of as-prepared La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposites with different La-to-Fe molar ratios in terms of phosphate sorption capacity and magnetic property as well as La content, La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposite with a La-to-Fe molar ratio of 2:1 was selected for further characterization and adsorption performance evaluation. Batch adsorption experiments showed that La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) adsorbent exhibited a remarkable phosphate sorption capacity of 134.82 mg P/g, a fast sorption kinetic, strong selectivity for phosphate in the presence of co-existing anions, and a wide applicable pH range of 3−9. Furthermore, La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) sorbent displayed an excellent sorption performance for low-concentration wastewater, a low dosage of 0.1 g/L was sufficiently enough for reducing P-concentration from 0.5 mg P/L to below 10 μg P/L within 20 min. In a real sewage of 2.68 mg P/L, 0.2 g/L of sorbent could reduce the concentration of phosphate to <0.01 mg P/L within 50 min. Moreover, over 83.1 % of original sorption capacity could be retained after 5 consecutive regeneration cycles, showing great regenerative performance of the adsorbent. These development is expected to be meaningful for practical water purification.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qingtao Wang,Xun Wei,Yanxia Wu,Guofu Ma,Ziqiang Lei,Shufang Ren
Electrocatalysts are useful in lowering the energy barrier in oxygen reduction reaction (ORR). In this study, a catalyst with neighboring Fe single-atom and cluster is created by adsorbing a bimetallic Fe complex onto N -doped carbon and then pyrolyzing it. The resulting catalyst has good performance and a half-wave potential of 0.89 V. When used in Zn-air batteries, the voltage drops by only 8.13 % after 145 h of cycling. Theoretical studies show that electrons transfer from neighboring clusters to single atoms and the catalyst has a lower d-band center. These reduce intermediate desorption energy, hence improving ORR performance. This work demonstrates the capacity to adjust the catalytic properties through the interaction of diverse metal structures, which helps to design more efficient catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Wenlong Hu,Lulu Yang,Shuzheng Zhang,Fuzheng Guo,Fangxin Wang,Shaohua Liu,Yu Cang,Bin Yang
Carbon fiber reinforced polymer composites (CFRPs) offer exceptional specific strength and lightweight characteristics due to the high-performance nature of carbon fiber. However, carbon fiber's chemical inertness results in weak interactions with the polymer matrix, which hinders the overall performance of the composites. Improving the interfacial properties has been a longstanding challenge in CFRPs development. Introducing nanomaterials along with chemical agents at the interface can enhance both physical and chemical interactions, facilitating better load transfer and more uniform stress distribution. Despite this, surface modification remains a complex process, and the lack of anchor bonds limits the effectiveness of chemical interactions. In this work, inspired by the crack-resistance mechanism of byssal cuticle through metal coordination bonds, we introduce a metal-phenolic network comprising ferric iron (Fe 3+ ) and tannic acid (TA) onto the carbon fiber surface using a simple one-pot deposition method. This approach significantly enhances the interfacial properties of the composite. The Fe 3+ -TA complex forms nano-sized aggregates on the fiber surface, with their morphology controllable by adjusting the precursor concentration and pH. The multiple reactive groups on TA allow for the incorporation of a silane coupling agent, effectively creating a chemical bridge between the carbon fiber and the matrix, further improving interfacial properties through synergistic chemical and physical interactions. This metal-phenolic network not only simultaneously strengthens and toughens the interface by promoting mechanical interlocking but also provides multiple chemical anchor sites to bridge the two components, offering new insights into strategies for interfacial strengthening and regulation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY & BIODIVERSITY
·
2024
·Vol. 21
·期 8
·e202302059
·
IF 2.3
Si-Mei Liu,Chong-Ying Liu,Zi-Long Chen,Yan Fang,Fang-Zheng Jiao,Li-Hua Zhang,Ting-Ting Zhang,Peng Zhao
This study extracted and purified a polysaccharide from Rehmanniae radix praeparata (RGP) with an average molecular weight. The structural characteristics of RGP and its iron (III) complex, RGP−Fe(III), were examined for their antioxidant properties and potential in treating iron deficiency anemia (IDA). Analysis revealed that RGP comprised Man, Rha, Gal, and Xyl, with a sugar residue skeleton featuring 1→3; 1→2, 3; and 1→2, 3, 4 linkages, among others. RGP−Fe(III) had a molecular weight of 4.39×10 4 Da. Notably, RGP−Fe(III) exhibited superior antioxidant activity compared to RGP alone. In IDA rat models, treatment with RGP−Fe(III) led to increased weight gain, restoration of key blood parameters including hemoglobin, red blood cells, and mean hemoglobin content, elevated serum iron levels, and decreased total iron-binding capacity. Histological examination revealed no observable toxic effects of RGP−Fe(III) on the liver and spleen. These findings suggest the potential of RGP−Fe(III) as a therapeutic agent for managing IDA and highlight its promising antioxidant properties. Graphical
研究领域:
中药学
·
生物化学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jingjing Xie,Nansheng Wu,Dongming Li,Shiyi Xiong,Jinjiao Dong,Ruiling Wang,Guodong Zheng,Jingen Li
Iron deficiency anemia (IDA) is a prevalent nutritional deficiency problem. This study aimed to investigate the characteristics of Choerospondias axillaris polysaccharide-Fe (III) complex and its effect on IDA mice. CAP-Fe (III) complex was synthesized by co-thermal synthesis method with an iron content of 27.31 ± 0.97 %. The chelation of Fe 3+ reduced the crystallinity, increased the thermal stability and changed the morphological features of CAP, which was evidenced by XRD, TG, and SEM analysis. The probable existence of the β -FeOOH structure was supported by the characteristic absorption peaks in the FT-IR, XRD, and Mössbauer spectra. The CAP-Fe (III) complex showed a therapeutic effect on IDA mice, confirmed by improved erythroid parameters, iron levels, and oxidative stress. The results of gene expression levels determined by RT-qPCR demonstrated that the CAP-Fe (III) complex could regulate iron metabolism homeostasis, alleviate liver inflammation, and enhance intestinal barrier function. Furthermore, the dysbiosis of intestinal microbiota induced by IDA was effectively restored by CAP-Fe (III) complex, through enriching beneficial bacteria ( Firmicutes , Blautia , Oscillibacter , Colidextribacter ) and depleting harmful bacteria ( Actinobacteria , Proteobacteria , Parasutterella , Faecalibaculum , Escherichia-Shigella ). These findings suggested that CAP-Fe (III) may serve as a novel iron supplement for treating IDA.
研究领域:
营养学
·
分子生物学
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药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhuoran Sun,Wenjing Song,Hongli Chen,Lili Li
Designing and constructing reversible and stable anode materials was vital to lithium/sodium-ion batteries. Here, multiple carbon-protected Mn and Fe based composite anode with three-dimensional cross-linked networks was designed. The MnFe 2 O 4 composite nanoparticles were synthesized via co-precipitation firstly. Then by combining different coating technologies and heat treatment, MnO/Fe 3 C with stable carbon doped (MnO/Fe 3 C@C 3 ) composite anode for lithium/sodium-ion storage was prepared. The results showed that MnO/Fe 3 C@C 3 exhibited the excellent reversible capacities of 608.2 mAh g −1 at 0.2 C after 100 cycles and 348.2 mAh g −1 at 10 C after 1500 cycles for lithium-ion battery. MnO/Fe 3 C@C 3 as sodium-ion anode also showed the capacity of 282.4 mAh g −1 at 0.2 C after 100 cycles. The study indicated that MnO/Fe 3 C as active components were produced by the doped carbon participating in redox reaction. In addition, the stable doped carbon was also formed by the binding of graphitic carbon with carbon layers. GITT and EIS tests revealed that the addition of MWCNTs could effectively enhance the ion transport kinetics and further optimize the electrochemical performance. This study highlighted a way to construct the active component with stable doped carbon as anode, which could exhibit the excellent recyclability and electrochemical performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shuang Han,Pengfei Xiao
Tetracycline (TC) is a refractory pollutant that widely exists in water environments. Therefore, effective TC treatment methods must be developed. In this work, a cobalt and iron coloaded pomelo peel biochar composite (Co-Fe@PPBC) was successfully synthesized and used to activate peroxymonosulfate (PMS) for TC removal. The crystal structure, surface morphology, pore structure, and elemental valence of the synthesized Co-Fe@PPBC catalyst were investigated by BET, SEM, XRD, FTIR, XPS, TGA, Raman, and VSM. The effects of Co-Fe@PPBC dosage, PMS concentration, initial pH, initial TC concentration, and coexisting anions on TC removal were studied. In comparison with the oxidation (13.6%) by PMS alone and adsorption (9.6%) by Co-Fe@PPBC alone, the removal efficiency of TC was increased to 86.2% in the Co-Fe@PPBC/PMS system, indicating that Co-Fe@PPBC can successfully activate PMS. Remarkably, the results of scavenging examination and EPR analysis demonstrated the synergistic effect of free radical and non-free radical pathways in TC degradation. The cycling test showed that Co-Fe@PPBC has favourable stability and recyclability during repeated activation processes of PMS. Finally, three possible TC degradation methods were presented through the analysis of eight intermediates. Overall, Co-Fe@PPBC could be an economic and high-efficiency catalyst for PMS activation to remove organic pollutants in wastewater.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yubin Xiang,Jie Li,Ke Wang,Yangfan Zhang,Zhengyu Li,Zhi Li,Xue Lu,Yongming Guo
Nanocomposites have gained extensive interest in improving control efficacy and reducing usage amount of traditional pesticides. In this study, a complex of porous CaCO 3 and tannic acid-iron(III), named as PCC@TA(Fe III ), was fabricated and used as carrier for prometryn (PMT) to obtain a pH-controlled release herbicide of PCC/PMT@TA(Fe III ). Under neutral pH condition, the PMT release rate from PCC/PMT@TA(Fe III ) was merely 19 % while reached about 80 % at pH 5.5 and 8.5. Such pH controlled-release behavior of PMT was probably related to the pH-dependent structure transformation of PCC@TA(Fe III ). The release kinetic mechanism was in conformity with the parabolic diffusion model. Pot experiment result indicated that PCC/PMT@TA(Fe III ) showed a higher control efficacy against Setaria viridis compared with PMT alone. Additionally, PCC@TA(Fe III ) could effectively reduce the leaching loss of PMT in soil and show a good biosafety . Thus, this work provides a novel approach to improve control efficacy and relieve environmental pollution risks of pesticide.
研究领域:
农业科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2020
·
IF 1.808
Yongshuai Jing,Ruijuan Zhang,Lanfang Wu,Danshen Zhang,Yuguang Zheng
The preparation conditions of Glehniae Radix polysaccharide-iron complex (GLP80-Fe) were optimized and the physicochemical properties were characterized by Ultraviolet-visible spectroscopy (UV-Vis), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD), Transmission electron microscope (TEM), Thermogravimetric analyzer, and Differential scanning calorimetry (TGA-DSC), respectively. The stability and reducibility of GLP80 and GLP80-Fe were analyzed, and the monosaccharide composition was determined by gas chromatograph (GC). In vitro antioxidant activity of GLP80 and GLP80-Fe were evaluated by determining the radical (DPPH and hydroxyl radical) scavenging abilities. The results showed that the highest iron content of GLP80-Fe (15.61%±0.04) was obtained at the optimum conditions: reaction temperature was 38.0°C, reaction time was 3.0 h, FeCl3 addition was 2.9 mL and pH was 9. GLP80-Fe was a complex with β-FeOOH as the core and polysaccharides on its surface, and it was stable at pH 3 ~ 14. GC showed that the major monosaccharides were mannose (Man) and galactose (Gal) with a ratio of 1:5.15. In vitro free-radical scavenging activity of GLP80-Fe was significantly better than GLP80. The IC50 of GLP80-Fe against DPPH and hydroxyl radical were 3.785 mg/mL and 1.460 mg/mL, respectively.
研究领域:
中药化学
·
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2018
·Vol. 54
·期 1
·170-182
·
IF 2.383
Hong He,Fengping An,Hui Teng,Qun Huang,Hongbo Song
Summary This study aimed to synthesise a complex of agar oligosaccharides (AOS) with ferric iron and to evaluate its physicochemical and structural characteristics. Based on single factor, Plackett–Burman and response surface optimal experiments of three factors at three levels, the optimised chelate conditions of the AOS-iron (III) complex were mass ratio of AOS to iron ions of 4.5:1 g:g, reaction temperature of 74 °C and reaction time of 60 min. Under these conditions, the iron content and total sugar content were 14.03 ± 0.42% and 66.07 ± 0.96%, respectively. The physicochemical analysis showed that AOS–iron (III) was soluble and steady at physiological pH, and it was easily reduced to iron (II). The structural characteristics of AOS and AOS–iron (III) were analysed by Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and Nuclear magnetic resonance, and results showed that the iron (III) ions were chelated to AOS by –OH groups and –COOH groups and widely dispersed on the AOS backbone. Therefore, AOS–iron (III) could be a candidate for iron supplementation to treat iron deficiency anaemia.
研究领域:
化学
·
材料科学
·
营养学
✓ 已验证
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 5
·1231
·
IF 5
Zhenyu Han,Yongqiang Zhang,Liang Wang,Guangqian Zhu,Jia Kuang,Guangyu Zhu,Guangqiang Xu,Qinggang Wang
3,4-Enhanced polymerization of isoprene catalyzed by late transition metal with high activity remains one of the great challenges in synthetic rubber chemistry. Herein, a library of [N, N, X] tridentate iminopyridine iron chloride pre-catalysts (Fe 1–4) with the side arm were synthesized and confirmed by the element analysis and HRMS. All the iron compounds served as highly efficient pre-catalysts for 3,4-enhanced (up to 62%) isoprene polymerization when 500 equivalent MAOs were utilized as co-catalysts, delivering the corresponding high-performance polyisoprenes. Furthermore, optimization via single factor and response surface method, it was observed that the highest activity was obtained by complexFe 2with 4.0889 × 107g·mol(Fe)−1·h−1under the following conditions: Al/Fe = 683; IP/Fe = 7095; t = 0.52 min.Keywords:tridentate iminopyridine iron complex;high activity;isoprene polymerization;response surface methodology
研究领域:
有机化学
·
高分子化学
✓ 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）