Polymers
·
2021
·Vol. 13
·期 13
·2072
·
IF 4.329
Xiaoyan Liu,Ruidan Liu,Tianyu Li,Yanqi Liu,Li Liu,Kai Lyu,Surendra P. Shah
Graphene is a two-dimensional sheet of regular hexagonal honeycomb lattice formed by sp2hybrid orbital bonding, with only one layer thickness of a single atom, which is known as the “super king” of the 21st century. Previous studies have shown that cerium oxide-graphene oxide (CeO2-GO(4:1)) nanocomposites eliminated the agglomeration of graphene to some extent and the CeO2-GO(4:1) epoxy coating could be prepared with good anti-corrosion performance. In this paper, CeO2-GO(4:1) nanocomposites were prepared by the hydrothermal synthesis method, and the three-electrode method was used for electrochemical tests. The state evolution of CeO2-GO(4:1)/EP coating and the synergy between CeO2-GO(4:1)/EP and corrosion inhibitor in simulated seawater solution with different concentrations (20%, 40%, 60%) were analyzed and illustrated by Optical Microscope (OM) characterization, Open Circuit Potential (OCP), Electrochemical alternating current Impedance Spectroscopy (EIS), Mott–Schottky curve and Tafel curve. The results indicated that CeO2-GO(4:1) nanocomposites showed good corrosion resistance in a marine environment. This research lays a solid theoretical foundation for the application of cerium oxide-modified graphene oxide anticorrosive coating in marine engineering.Keywords:CeO2-GO;corrosion inhibitor;simulated seawater;corrosion area
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yan Ma,Na Gao,Zhichuang Zuo,Shanni Li,Wenqi Zheng,Xiang Shi,Qipei Liu,Ting Ma,Ronghua Yin,Xian Li,Jinhua Zhao
Fucan sulfates from echinoderm possess characteristic structures and various biological activities. Herein, comprehensive methods including enzymolysis, ion-exchange chromatography and size exclusion chromatography lead to the purification of five fucan sulfates (FSI, FSII, FSIII, FSIV, FSV) from the sea cucumber Pattalus mollis . Chemical composition analysis showed that they were all composed of l -fucose. Their sulfate content was determined by a conductimetric method. The molecular weight (Mw) of FSI, FSII, FSIII, FSIV and FSV were measured as 238.3 kDa, 81.0 kDa, 82.0 kDa, 23.2 kDa and 6.12 kDa, respectively. Detailed NMR spectroscopic analysis revealed that the structural sequence of FSI and FSII was →3)- l -Fuc S -α(1→, where Fuc S were Fuc 2S4S (10%), Fuc 2S (44%), Fuc 0S (10%), Fuc 4S (36%), that of FSIII was →4)- l -Fuc 2S -(α1 → 4)- l -Fuc 2S -(α1 → 4)- l -Fuc 0S/3S -(α1→, where Fuc 0S and Fuc 3S were in equal molar, and that FSIV was →4)- l -Fuc 2S3S -(α1 → 4)- l -Fuc 2S3S -(α1 → 4)- l -Fuc 2S -(α1→4)- l -Fuc 2S -(α1 → 4)- l -Fuc 2S -(α1 → 4)- l -Fuc 2S -(α1 → . This is the first report that such a diversity of fucan sulfates were obtained from the same sea cucumber species. Biological activity showed that FSI, FSII, FSIII and FSIV exhibited potent anticoagulant by prolonging the APTT. Among them, FSII, FSIII and FSIV showed the similar potency, while FSI owned the strongest. Structure-activity relationships analysis showed that molecular weight and sulfation degree should be the crucial factors for the activity.
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TALANTA
·
2024
·
IF 5.6
Hangqian Li,Shu Wang,Shulu Zheng,Tengyue Fang,Huilin Shu,Yi Xu,Xianghui Guo,Eric P. Achterberg,Liyang Zhan,Jian Ma
The development of field-deployable methods and instruments for the measurement of pH and other carbonate parameters is important for the assessment of the marine carbon cycle , ocean acidification and marine carbon dioxide removal techniques. In this study, a high-precision fully automated integrated syringe-pump-based environmental-water analyzer for pH ( i SEA-pH) was developed. The pH is determined spectrophotometrically using purified indicator dye with a high precision (better than ±0.001) and high frequency (3.5 min/sample). For the short-term analysis, the measurement frequency was 18 h −1 , which revealed pH = 7.8148 ± 0.0005 (n = 104) for aged surface seawater (S = 35) from the western Pacific. For long-term analysis, the measurement frequency was 2 h −1 for 4 days, and the results showed that pH = 7.8148 ± 0.0010 (n = 200). Three commonly used pH indicators (meta-cresol purple, thymol blue and phenol red) were purified with improved flash chromatography procedures. The autonomous i SEA-pH can automatically correct for the influence of temperature, salinity and other factors on pH measurements to achieve rapid and accurate on-site measurements, which meet the “climate” goal of the Global Ocean Acidification Observing Network (uncertainty is ±0.003). Three identical i SEA-pH systems were developed and successfully applied in mesocosm experiments and several coastal and open ocean cruises with excellent in field performance.
研究领域:
环境科学
·
海洋化学
·
海洋学
·
分析化学
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高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yue Zhang,Jing-Chun Feng,Yuhang Zhang,Bin Wang,Jinyi Liu,Yi Wang,Si Zhang
On the cold seep seafloor, methane hydrate is an important form of carbon storage. The stability of methane hydrates and mechanisms of ionic effects on hydrates are closely related to seafloor methane release and carbon cycling. Cold seeps are endowed with abundant and high-quality hydrate resources under the environmental conditions of low temperatures and high pressures. Methane hydrates are seen as a potential source of renewable energy and a possible form of energy storage, as the global demand for clean energy increases. Although studies have focused on the formation and dissociation processes of methane hydrates, the influence of seawater ions on the kinetics of hydrate formation is still unclear. In this study, we studied the formation kinetics of methane hydrate in ion systems, analyzed the effects of various main ions, and compared them with in situ seawater composition. The phase equilibrium point of methane hydrate in the in situ seawater system was experimentally determined by us to better understand the stability. The degree of inhibition on the methane hydrate formation kinetics in natural seawater is more closely to that of CaCl2, MgCl2, and SrCl2, as indicated by gas consumption during methane hydrate formation. However, NaCl exhibits a greater inhibition effect than that of CaCl2, MgCl2, and SrCl2. The thermodynamic behavior of in situ seawater is consistent with the inhibition degree of SrCl2 on methane hydrate formation. In addition, morphological characteristics of hydrates possessed dense powdery particles and ice particles on the surface of the seawater–methane system, which combined with both hydrate morphologies, the pure water–methane system (ice particles), and the saline ions–methane system (powdery particles). The findings of this study may provide a reference for further exploration of methane hydrate formation in cold seep environments and provide a basis for an in-depth understanding of submarine methane release and carbon cycling.
研究领域:
海洋科学
·
环境科学
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jingguo Liu,Hongyan Li,Haiming Li,Wenze Song,Shilei Xia,Dongqing Wei,Juanjuan Wang,Huan li
Ceramic aerogels prepared using the polymer-derived ceramics (PDCs) route were extensively applied in the thermal insulation field with lightweight and high-temperature resistance. However, ceramic aerogels were susceptible to weight loss and volume shrinkage at high temperatures, leading to the collapse of the aerogel structure and a reduction in thermal insulation performance. In this paper, inspired by the skeletal structure of deep-sea glass sponges, hollow porous MHP-SiC-CA ceramic fiber aerogel was prepared by electrostatic spinning. The anti-shrinkage property of ceramic fiber aerogel was improved through the circular and spindle-shaped pores on the surface of hollow fibers. The gas-solid phase interface was increased by the abundant nanopore structure, leading to enhanced reflection and refraction of thermal radiation within the aerogel. The heat conduction and heat convection of the aerogel were reduced with the hollow and porous structure. The results presented that the ceramic fiber aerogel exhibited excellent anti-shrinkage properties, high specific strength , and ultra-low thermal conductivity . The material was expected to provide novel perspectives for the development of ceramic fiber aerogels applicable to ultra-high-temperature environments.
研究领域:
材料科学
·
生物启发工程
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ahmed Elhassan,Ibrahim Abdalla,Jianyong Yu,Zhaoling Li,Bin Ding
Over the past few decades, extensive usage of electronic devices have led to the ubiquitous occurrence of electromagnetic waves, which have posed a significant hazard to human health and surrounding environment. Most of the currently developed electromagnetic wave absorption materials present serious drawbacks and it is highly desired to develop effective strategies to address these problems. Herein, we fabricated a sea cucumber-like hollow structured fibrous composite based on facile chemical polymerization and fast microwave calcination. The formation of multi-shell hybrid structure exhibited excellent electromagnetic wave absorption (EMWA) performance. Specifically, the composite sample showed a minimum reflection loss (R L ) value of −41.4 dB at 7.3 GHz due to the suitable impedance match resulting from a good balance between the magnetic loss and dielectric loss. In addition, the existence of special hollow structure can enhance the absorption intensity and a wide range of (3.5–18 GHz) wave absorption (<−10 dB) can be achieved because of repeated shell scattering and multiple reflection both in the cavity and between the interlacing hybrid nanofibers. This work demonstrates not only an easy, fast, eco-friendly, cost-effective but also versatile synthesis strategy to design novel EMWA materials with advanced structures and excellent performance.
研究领域:
材料科学
·
电磁学
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Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 12
·1807-1815
·
IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
·
材料科学
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Xiao Sun,Lulu Zhu,Xin Qi,Hongwei Zhang,Ling Wu,Jinhua Wang,Hu Hou
The non-enzymatic degradation of ready-to-eat sea cucumber (RSC) was closely related to the quality of sea cucumber products. When stored at 37 °C for 0–30 d, the hardness of RSC decreased by 86.7% and the proportion of free water increased by 12.71%. The content of free hydroxyproline increased from 8.33 μg/g to 24.12 μg/g. Label-free quantitative proteomics analysis showed that protein was prone to break at the sites of G, Q, N, D, and L, and the peptide bonds in QI, DL, NL, RI, EF and SY were much more liable to break. Edman degradation method showed that the breakage sites of RSC were at S, D, H, E, and V. NL, NA and NG calculated by B3LYP/6-31G(d) showed that the relative free energies in the initial cyclization step were 53.20, 143.53 and 78.10 kcal/mol, respectively, which may be the rate-determining step for peptide bond cleavage.
研究领域:
食品科学
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蛋白质组学
·
化学
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高影响因子
Food Bioscience
·
2025
·
IF 5.9
Zhe Xu,Jiale Chang,Zijin Qin,Hanxiong Liu,Xu Yan,Shuang Guan,Xiufang Dong,Jianping Wu,Tingting Li
The effective modulation of pancreatic lipase activities is critical in maintaining blood triglycerides and cholesterol levels within normal physiological ranges. This study investigated the inhibitory effect of peptides from sea cucumber collagen on pancreatic lipase activity through interaction with the Ca-binding sites on the enzyme. Among the five sea cucumber collagen digests (SCCD), the pepsin-digested 2h+trypsin-digested 3h digest (SDP2h+T3h) showed the strongest inhibitory effect on pancreatic lipase. A peptide RDDPEPSYK (RDD), with a sequence of Arg-Asp-Asp-Pro-Glu-Pro-Ser-Tyr-Lys from SDP2h+T3h, was found to target the Ca-binding site of pancreatic lipase, interacting with certain residues including Asp184, Glu187, Lys163, etc. Additionally, a cell study on 3T3-L1 preadipocytes indicated RDD's capability to inhibit adipocyte differentiation, as well as decrease intracellular triglycerides, total cholesterol, and lipid content. The results from this study suggest that RDD is a targeted pancreatic lipase inhibitor with potential applications for obesity control.
研究领域:
生物化学
·
药理学
·
营养科学
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Li-Xin Kou,Xiao-Yu Zhang,Zi-Cen Zuo,Na Liu,Zhen He,Gui-Peng Yang
Polyhalogenated carbazoles (PHCZs), an emerging class of halogenated organic pollutants, have been widely detected in various environmental media, including sediments, soil, air, and organisms. The East China Sea (ECS) is a vital region for marine and fishery resource development in China, yet research on the pollution levels and sources of PHCZs in its sediments remains limited. This study reports the occurrence of seven PHCZs in the surface sediments of the ECS, with detection rates exceeding 90%. The concentrations of Σ 7 PHCZs ranged from 3.5 to 27 ng/g, with an average of 9.9 ng/g. The predominant congeners were 1368-BCZ and 3-ICZ. The sources of PHCZs included a non-specific source transported via terrestrial runoff (39%), industrial wastewater discharge (35%), and optoelectronic material pollution (26%), as identified by the positive matrix factorization model. The ecological risk assessment, based on TEQ, indicated a range of 0.18–5.0 pg TEQ/g across the study area. These findings highlight the potential ecological concerns associated with PHCZs in the ECS and emphasize the need for enhanced environmental monitoring and source mitigation efforts to reduce their potential environmental impacts.
研究领域:
环境科学
·
海洋学
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高影响因子
IONICS
·
2024
·
IF 2.4
Wu Fang,Ge Jin-Long,Zhu Yujun,Jiao Yuhong,Wu Zhong,Feng Chao,Zhao Yupei,Li Qiu
The development of high-performance and cost-effective electrocatalysts toward the oxygen evolution reaction (OER) is remarkably desirable but challenging. Herein, we design and fabricate a sea urchin-like S-doped Ni(OH) 2 electrocatalyst on nickel foam using a simple hydrothermal method, followed by treatment with Na 2 S solution. The introduction of S not only modulates the electronic structure of Ni(OH) 2 , but also improves the electronic conductivity, thus enhancing the OER performance of Ni(OH) 2 . Owing to the free-standing feature, modified electronic structure, and sea urchin-like structure, the optimized S-Ni(OH) 2 –30 min delivers excellent OER performance with overpotentials of 306 and 392 mV at 10 and 100 mA cm −2 , respectively, Tafel slope of 89.2 mV dec −1 , and stability for 30 h at 50 mA cm −2 . This work demonstrates the importance of incorporating S in Ni(OH) 2 to optimize the electronic structure for improving OER activity and provides a promising pathway to synthesize Ni(OH) 2 -based electrocatalysts.
研究领域:
材料科学
·
电化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huanyu Fu,Xiaomei Liu,Jun Wang,Xuewen Hu,Yang Zhao,Shuo Chen,Heyang Sun,Yang Li,Xiaobin Fan,Wenchao Peng
Electrosynthesis of hydrogen peroxide (H 2 O 2 ) via the two-electron oxygen reduction reaction (2e − ORR) route is regarded as a promising substitute for the conventional anthraquinone method. In this study, a core–shell Ni@carbon material with adjustable shell thickness was synthesized using a simple hydrothermal-calcination method with the formation of metal organic framework (MOF) as the intermediate. During the calcination process, sea-urchin like morphology was obtained with nickel nanoparticles as the core and nitrogen-doped carbon nanotubes (NCNTs) as the shell. The optimized [email protected] material exhibits a high H 2 O 2 selectivity of >90 % in a wide potential range of 0.2–0.6 V, and a H 2 O 2 concentration of 797 mg/L can be achieved within 120 min in 0.1 M KOH. The generated H 2 O 2 can maintain almost 100 % degradation of 10 ppm Rhodamine B within 12 h. Theoretical calculations unveil that the synergistic effect between encapsulated nickel nanoparticles (Ni NPs) and N-doped carbon layers effectively regulates the charge distribution, resulting in optimal binding strength of *OOH intermediate, thus leading to the high selectivity of H 2 O 2 . This work provides an efficient strategy for the synthesis of electrocatalysts with high performance for 2e − ORR.
研究领域:
材料科学
·
电化学
·
催化
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高影响因子
危险品化学品经营许可证（带存储）