Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 6
·1072-1081
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IF 7
Yanan Zhu,Yuanfu Deng,Guohua Chen
Carbon materials with large exposed surfaces and heteroatom doping have great potential in suppressing the shuttle effect in Li–S batteries. In this study, crosslinked triazine frameworks were successfully utilized to synthesize heteroatom-doped carbon nanosheets utilizing g-C3N4 nanosheets as the hard template and porogen. Characterization studies show that the nanosheets were highly crinkled and interconnected with a large surface area (1060 m2 g−1) and pore volume (2.14 cm3 g−1), and with highly dispersed N, O and S. After coating them on commercial Celgard separators, batteries with the modified separators showed a low self-discharge and an improved rate performance even at 4 C. At 0.5 C, the initial discharge capacity was 1240 mA h g−1 with a capacity decay of 0.059% per cycle for over 1000 cycles. Moreover, excellent cycling performances at 2 C for 500 cycles were also achieved. The excellent performance can be attributed to the large surface area and porous structure of NOS-C, the superior wettability toward the electrolyte, enhanced Li+ diffusion, strong interactions between polysulfides and doped atoms, and the accelerated redox kinetics of polysulfides.
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Catalysts
·
2022
·Vol. 12
·期 12
·1583
·
IF 4.501
Ximiao Zhu,Fan Yang,Jinhua Liu,Guangying Zhou,Dongdong Chen,Zhang Liu,Jianzhang Fang
A novel phosphorus and oxygen co-doped graphitic carbon nitride (sheetP-O-CNSSA) photocatalyst was successfully synthesized and applied for H2evolution under visible light. In the synthesis process ofsheetP-O-CNSSA, the supramolecular complex was developed by the self-assembly and copolymerization reaction among melamine, cyanuric acid (CA) and trithiocyanuric acid (TCA) to act as g-C3N4precursors, while (NH4)2HPO4was applied as P and O precursors for element doping. The chemical structures, morphologies, and optical properties of thesheetP-O-CNSSAwere characterized by a series of measurements, i.e., XRD, FT-IR, SEM, TEM, UV-vis DRS, and PL. The results suggested that the introduction of P and O elements could enhance the separation and migration efficiency of photogenerated electrons and holes in the energy band of g-C3N4. The photocatalytic tests over Erythrosin B (EB) sensitizedsheetP-O-CNSSAindicated that the hydrogen evolution was greatly enhanced compared with other catalysts and non-sensitizedsheetP-O-CNSSAunder visible light irradiation. Finally, a possible dye-sensitized photocatalysis mechanism was also proposed on the basis of the as-obtained results.Keywords:P-O-co-doped g-C3N4;self-assembly;dye sensitization;hydrogen evolution
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lijie Chen,Yuan Gao,Junjie Lian,Le Li,Dexin Ding,Zhongran Dai
Photocatalytic reduction of soluble hexavalent uranium to insoluble tetravalent uranium is a promising strategy for uranium-containing wastewater treatment, while this method generally requires anaerobic conditions and/or the addition of sacrificial agents. Obviously, providing anaerobic environment and sacrificial agent will not only increase the cost but also causes secondary pollution. Thus, efficient removal of U(VI) by photocatalytic techniques under air atmosphere without sacrificial agents is an urgent task and great challenge. In this work, a novel O, K co-doped g-C 3 N 4 (OKDCN) photocatalyst was synthesized by a simple thermal reaction for the photoreduction removal of U(VI) under air atmosphere without sacrificial agents. Batch experiments show that the OKDCN-2 can nearly completely remove U(VI) in the solution within 120 min at pH 5.0. In addition, the OKDCN showed excellent reusability and selectivity in the process of photocatalytic reduction of U(VI). Further mechanism studies show the doping of O and K can improve the photogenerated carrier transfer and separation efficiency of OKDCN, and then improve the performance of photocatalytic reduction of uranium. These results provide a reference for breaking through some bottleneck issues in the research field of photocatalytic removal of U(VI).
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INTERNATIONAL DAIRY JOURNAL
·
2022
·
IF 3.572
Xianglin Yue,Junru Sun,Ru Zhao,Jinsheng Zhang
Rapid screening and early warning of pathogenic bacteria in food is the key to prevent and control the spread of foodborne diseases . Biotin–streptavidin system and membrane filtration technology were combined to develop a novel nuclear magnetic resonance (NMR) immunosensor based on biomacromolecule O-carboxymethyl chitosan (O-CMCS) target gadolinium (Gd) probe for rapid detection of Salmonella anatum in milk. Under optimal experimental parameters, the proposed NMR immunosensor could detect Salmonella in milk with a limit of detection of 1.8 × 10 4 cfu mL −1 within 2 h. Furthermore, the immunosensor exhibited good specificity, sensitivity and reproducibility, which could achieve the direct determination of biological samples with complex composition. Hence, the developed assay might have great application potential for the rapid detection of Salmonella in food.
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JOURNAL OF FOOD SCIENCE
·
2022
·Vol. 87
·期 5
·2159-2172
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IF 3.693
Zhenzhu Zhu,Lipin Yang,Zhong Li,Qin Liu
Neurotoxicity seriously affects the normal function of the nervous system. Cyanidin-3-O-glucoside (C3G) is the most abundant anthocyanin widely distributed in plants. Using β -amyloid (A β ) transgenic Caenorhabditis elegans and cell models, the neuroprotective effect of C3G was examined. The results showed that C3G remarkably suppressed A β aggregation, enhanced antioxidant capacity, improved the sensitive capacity towards chemical compounds, and boosted the memory ability of C. elegans . There was no significant difference between preventive and long-term treatment groups at the same dosage of C3G. Given the rapid metabolism and oxidation of C3G in vivo, the antioxidative and anti-inflammatory activities of C3G, the metabolite cyanidin (Cy), oxidation products of Cy (OP), as well as protocatechuic acid (PCA) at the corresponding level in OP were compared by using lipopolysaccharide (LPS)-stimulated BV2 microglia cell model. The results indicated that C3G, Cy, and OP could prevent BV2 cells against LPS-induced inflammation and oxidative damage. There was no significant difference on antioxidative and anti-inflammatory activities among C3G, Cy, and OP at the same level. Notably, PCA at the corresponding concentration in OP exhibited limited antioxidative and anti-inflammatory activities. The results suggested that C3G could exert neuroprotective function through the metabolite Cy and its oxidation products by inhibiting inflammation and oxidative damage, and PCA was not the primary bioactive species in OP. Practical Application This study confirmed the neuroprotection of cyanidin-3-O-glucoside (C3G) in transgenic Caenorhabditis elegans . C3G, its metabolite cyanidin (Cy), and oxidation products of Cy (OP) alleviated both neuroinflammation and oxidative damage. It highlighted that C3G-rich foods could exert neuroprotective potential through their oxidation products, the constitution, and existence of OP in vivo need further study.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yunfeng Qiu,Xiaofan Dai,Yanping Wang,Xinyang Ji,Zhuo Ma,Shaoqin Liu
It is urgent to develop non-noble metal electrocatalysts with both excellent activity and durable stability for H 2 production via water electrolysis. Electric energy is mainly consumed by the sluggish anodic oxygen evolution reaction (OER). The electrocatalytic urea oxidation reaction (UOR) has been regarded as a promising reaction to replace OER because of its small thermodynamic oxidation potential . However, developing a facile and large-scale preparation method for bifunctional hydrogen evolution reaction (HER) and UOR electrocatalysts is still challenging. Herein, phosphate-modified (4.46 atomic%) NiMoO 4−x net-like nanostructures are formed on Ni foam (NF) via H 3 PMo 12 O 40 etching strategy at room temperature (denoted as NF/P-NiMoO 4−x ). The etched NF can directly serve as HER electrode , and delivers overpotential of 116 mV at current density of 10 mA/cm 2 with Tafel slope of 77.5 mV/dec. Furthermore, it displays excellent UOR activity with potential of 1.359 V at current density of 10 mA/cm 2 and Tafel slope of 19.3 mV/dec. The apparent activation energy of NF/P-NiMoO 4−x is 20.6 kJ/mol, lower than that of NF (37.7 kJ/mol), indicating smaller apparent barrier for C N bond cleavage in urea. The cell voltage of urea electrolysis is around 1.48 V for H 2 production to deliver current density of 10 mA/cm 2 , and better long-term stability for 50 h than that of Ir/C||Pt/C. The etching solution can be recycled for five times by addition of H 2 O 2 , turning heteropoly blue into its original state. This work develops a facile and large-scale method to prepare bifunctional HER and UOR electrocatalysts for H 2 production in a less-energy saving way via urea electrolysis.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yuerong Yang,Yu Lu,Yinchuan Liu,Yu Pan,Hongjuan Ma,Linjuan Huang,Zhongfu Wang
Yak milk (YM) has higher protein content than other bovine milk (BM) varieties. The bioactivity of milk glycoproteins is related to N / O -glycans. We qualitatively and quantitatively compared the N / O -glycome of YM and BM glycoproteins using stable isotope labeling combined with hydrophilic interaction chromatography and electrospray ionization mass spectrometry. We identified 79 and 78 N -glycans in YM and BM, respectively. Two N -glycans (H4N5F1A1; H5N4F1) were exclusive to YM. The content ratios of different types of N -glycans differed significantly between YM and BM, with sialylated N -glycans 2.33 times more abundant in YM. Five and seven O -glycans were detected in YM and BM, respectively. Two O -glycans (H1N2; H1N2A1) were exclusive to BM. The bi-sialylated O -glycan, H1N1A2, accounted for 56.1% of O -glycans in YM; it was 5.97 times more abundant in YM than in BM (equal volume basis). This study provides a theoretical basis for the future utilization of YM as a functional food.
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GLYCOCONJUGATE JOURNAL
·
2021
·Vol. 38
·期 5
·527-537
·
IF 2.916
Zhang Xin,Wang Chen,Han Qing,Chen Xuan,Li Guoyun,Yu Guangli
Mucins are the major proteins that distributed on the intestinal mucosa layer and protect the intestine from pathogens infection. The composition of intestinal mucin O -glycans can affect the health of the gastrointestinal tract in pigs. Porcine intestinal mucosa is widely used as the main raw material of heparin extraction. The heparin extraction residues rich in mucins were usually wasted. The structure of mucin derived O -glycans in porcine intestinal mucosa are currently unknown. In this study, we isolated the mucins from the heparin extraction residues and profiled the O -glycans. After heparin extraction, mucin was digested with trypsin, and separated by strong anion exchange chromatography. The mucin derived O -glycans were release by alkaline β elimination, and analyzed by ultra high performance liquid chromatography-porous graphitized carbon-Fourier transform mass spectrometry (UPLC-PGC-FTMS/MS). Thirty five kinds of O -glycans were identified, most of which were Core 3-derived glycans. In particular, the O -glycans containing sialic acid Neu5Ac accounted for 71.93% of the total O -glycans, which were different from that of other species, including mouse intestine, fish intestine, and porcine colon. The high content sialylated mucin may explain its effect in biological processes. Furthermore, the immunological activity results indicated that the porcine intestinal mucin could promote phagocytosis and proliferation without any cytotoxic effects, which may aid in the development of immunomodulators.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Chen Liu,Ping Yang,Haili Wang,Huanlu Song
Yogurt is widely acknowledged as a healthy dairy product with unique aroma. However, the changes in the odor compounds often affect the storage and shelf life of yogurt. Besides, the complex colloidal system and low concentration levels of most of odorants make it more difficult to be analyzed. Therefore, this study extracted the odor compounds of yogurt through four extraction methods, including dynamic headspace sampling (DHS), solid phase micro-extraction (SPME), solvent-assisted flavor evaporation (SAFE), and Stir bar sorptive extraction (SBSE). A total of 117 odorants, including 27 esters, 27 alcohols, 22 ketones, 16 acids, 15 aldehydes, 5 sulfides, and 5 other compounds, were identified. Of which, 31 odor-active compounds were perceived, and 12 compounds were smelled for the first time in yogurt. Of the four methods, DHS showed the most outstanding extraction effect by obtaining 88 odor compounds. Around 13 volatiles were characterized as the key odor-active compounds of yogurt. Similarly, acetophenone and butyl acrylate were detected as the key odor-active compounds of yogurt for the first time. 2,3-Butanedione was the vital odor-active compound with the highest flavor dilution (FD) factor in yogurt. The results concluded that the odor-active compounds in yogurt might have synergistic and masking effects between them.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Yujiao Cheng,Guijie Li,Houjiu Wu,Linhua Huang,Hua Wang
Light-induced off-flavor compounds in Ponkan mandarin juice were investigated during its shelf-life by headspace solid-phase microextraction multidimensional gas chromatography–mass spectrometry/olfactometry (MDGC-MS/O) and a GC–MS/pulsed flame photometric detector (GC–MS/PFPD). A total of 34 aroma-active compounds with flavor dilution (FD) factors from 2 to 128 were tentatively identified by aroma extract dilution analysis-MDGC-MS/O. Among them, a light-induced off-flavor compound with a high FD factor, methional (cooked potato), was positively identified in the Ponkan mandarin juice at the end of the shelf-life. In addition, 11 volatile sulfur compounds (VSCs), including 6 screened shelf-markers (variable identification, VID > 0.80), were identified in Ponkan mandarin juice by a sulfur detector (PFPD). Four VSCs exhibited odor activity values exceeding 1. Three VSCs (methanethiol, dimethyl trisulfide, and methional) were confirmed as key light-induced off-flavor compounds in Ponkan mandarin juice based on addition/omission experiments. Furthermore, light irradiation accelerated the degradation of sulfur precursors (methionine and MMS) and the formation of these VSCs leading to an increase in off-flavor intensity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·9032-9043
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IF 2.478
Liu Yunyi,Pan Yongqi,Bai Xudong,Wang Jinchuan,He Caiwang,Xu Zunping,Chen Yi
A conventional ceramic preparation method was used to fabricate the newly designed ternary (K,Na)NbO 3 -based lead-free ceramics, which have the general formula of (0.97- x )K 0.40 Na 0.60 Nb 0.95 Sb 0.05 O 3 –0.03Bi 0.5 K 0.5 HfO 3 – x SrZrO 3 . An X-ray diffraction analysis, together with dielectric-temperature measurements, was performed for determining their phase structures. The crystal structure was found to transition from a rhombohedral-orthogonal phase coexistence to a three-phase coexistence of rhombohedral-orthogonal-tetragonal phases with the increase in SrZrO 3 concentration, and then to a rhombohedral-tetragonal phase coexistence, and finally to a single rhombohedral phase. Near the three-phase coexistence zone, the ceramics exhibit an obviously enhanced electrical activity, with an electromechanical coupling coefficient k p = 0.364 and a piezoelectric constant d 33 = 280 pC/N. Through a microstructure analysis, a slightly excessive amount of SrZrO 3 was found to result in an inhibition for the grain growth of the studied ceramics. These results show that incorporating SrZrO 3 into ternary (K,Na)NbO 3 -based ceramics is still an effective means of constructing phase boundaries and improving the electromechanical properties.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 32
·14724-14738
·
IF 3.591
Lin Qian,Zheng Zeng,Shuyuan Zhang,Kai Xia,Yongfu Guo
In the present work, a poly-o-vanillin-functionalized magnetic nanoparticle of PoVan/CoFe2O4@mSiO2 with core–shell structure was synthesized through a facile, green and low cost method. The rapid removal of Hg(II) by the prepared nanocomposites was researched by batch adsorption experiments and the adsorption conditions were optimized with response surface methodology (RSM). The optimization of RSM shows that the as-prepared PoVan/CoFe2O4@mSiO2 magnetic nanomaterial has a maximal adsorption capability of 263.6 mg g−1 toward Hg(II) ions. The removal process of Hg(II) ions acts in accordance with Langmuir and pseudo-second-order kinetic models. The Dubinin-Radushkevich calculation indicates that the removal process is spontaneous and exothermic. In addition, the adsorption of Hg(II) ions onto PoVan/CoFe2O4@mSiO2 is mainly completed through forming a stable complex by electrostatic attraction and chelation. The adsorption efficiency of the regenerated adsorbent is still high after five cycles. The used adsorbent of PoVan/CoFe2O4@mSiO2 has good magnetic property and can easily be separated from aqueous solution. The results indicate that the magnetic nanomaterial PoVan/CoFe2O4@mSiO2 could be a promising adsorbent to remediate mercury pollution from wastewater.
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