CATALYSIS LETTERS
·
2021
·Vol. 151
·期 11
·3170-3188
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IF 3.186
Zhang Qian,Zhou Yu-lian,Wang Bao-zong,Hong Jun-ming
The performance of electrocatalytic-oxidation process depends on the anode characteristics, so the preparation of active anode materials is an attractive method to enhance the efficiency of this process. However, the high catalytic properties of graphene and its derivatives have been well confirmed, an efficient method of controlling catalytic activity and stability remains to be established. In this research, the relationship between the precursor and catalytic performance was clarified by regulating the oxygen-containing groups in the precursor. Results indicated that the surface O groups on the precursor were sensitive to controlling the catalytic activity and stability of tri-doped reduced graphene oxide (RGO). With more O groups in the precursor (catalysts from graphene oxide), the doped heteroatom species is vulnerable involved into reaction, leading to the flaking of active sites, and ultimately decreasing the activity and stability performance. By contrast, the fewer O groups in the precursor (catalysts from RGO) created stable and active defects for oxidation activity. The interactions of O groups in the C precursor with those in the heteroatom precursor were further confirmed by DFT calculations. The findings of this research presented a new strategy for controlling the stability and performance of the resulting catalysts. Graphic Abstract DEME-TFSI-coated GO and GN are first formed via covalent bonds through functional groups (O groups) on the graphene surface, non-covalent ionic bonds, and π–π stacking interactions. In this step, N, S, and F groups are weakly bonded with graphene. Stable pyridine and pyrrole structures could then be generated via dehydration and decarbonylation under a controlled temperature and pressure in the hydrothermal process. Finally, cyclization rearrangement is carried out to form graphite with a tri-doped structure.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Linan Zhou,Ziteng Song,Shaojie Zhang,Yeling Li,Jing Xu,Yuanqiang Guo
Selenium nanoparticles (SeNPs), a potential cancer therapeutic agent, have attracted widespread attention owing to their high bioavailability and remarkable anticancer activity. Nevertheless, the poor water solubility and dispersibility of SeNPs seriously limit their applications. In the present study, we synthesized stable and individual spherical selenium nanoparticles (CL90-Tw-SeNP2) with an average diameter of approximately 79 nm using a polysaccharide extracted from Citrus limon (CL90) and Tween-80 as the decorator and stabilizers. The proportion of selenium in CL90-Tw-SeNP2 was 10.6%. CL90-Tw-SeNP2 possessed high stability and good dispersion in water for more than three months. The subsequent biological assay revealed that CL90-Tw-SeNP2 showed remarkable antitumor effects against HepG2 cells, with an IC 50 value of 49.13 μg/mL, by inducing cell apoptosis. Furthermore, an in vivo zebrafish assay to explore possible applications indicated that CL90-Tw-SeNP2 could inhibit the proliferation and migration of tumors and the zebrafish angiogenesis. These results indicated that CL90-Tw-SeNP2 could be a potential agent for cancer treatment, especially against human liver hepatoma cancer.
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FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Yupeng Lin,Fengping An,Hong He,Fang Geng,Hongbo Song,Qun Huang
In this study, the structural and rheological properties of pectin extracted by high-speed shearing (HSS–P) at 50 °C ultrapure water and conventional heating methods (CE50-P and CE90-P) from passion fruit ( Passiflora edulis f. flavicarpa ) peel were evaluated and compared. The HSS-P has loose, honeycomb-like surface morphology, lower molecular weight and higher polydispersity index compared to CE50-P and CE90-P. Monosaccharide composition indicated that HSS-P had more side chains, which were caused by its highly branched molecular structure, short main chains and a high molar ratio of RG-I in the molecular configuration. FTIR spectra showed that high-speed shearing led to a decrease in the linearity of the main chain of the pectin molecule. NMR spectra indicated that the molecular structure of HSS-P was a linear chain of homogalacturonan (HG) inserted into rhamnogalacturonan I (RG-I) possibly with arabinans and galactans as the principal side chains. Furthermore, the effects of pectin concentration, sucrose , CaCl 2 and pH on the rheological properties of different pectins were investigated. All pectin exhibited pseudoplastic fluid behavior at different environmental conditions. The HSS-P samples showed the greatest increase in the apparent viscosity and viscoelasticity in the presence of sucrose (60%–100%) and CaCl 2 (0.1–0.2 g/100 mL), pH changes and increased pectin concentration. The HSS-P was easily combined with the co-solutes and its viscoelasticity showed stronger stability under temperature changes. In conclusion, the high-speed shearing results in a unique molecular structure that contributed to the excellent rheological properties of pectin. Thus providing theoretical guidance for further application of high-speed shearing in extracting pectin.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xiaobo Min,Mingfei Zhu,Yingjie He,Yunyan Wang,Haoyu Deng,Sheng Wang,Linfeng Jin,Haiying Wang,Liyuan Zhang,Liyuan Chai
Electro-adsorption is attracting increasing attention as an emerging technology for removing ionic species from water but suffer from low selectivity . In this work, a bismuth/reduced graphene oxide nanocomposite electrode was fabricated by a facile and green method. Based on this material, an electrode with improved selectivity by electrochemistry deionization system was successfully fabricated. The bismuth nanoparticles were uniformly covered with reduced graphene oxide plates and the ratio of Bi on the whole materials is 79.56%. Bismuth/reduced graphene oxide showed ions selectivity in the order of Cl − > F − ≫ SO 4 2 − . The average Cl − removal capacity can reach as high as 62.59 mg g −1 . Moreover, bismuth/reduced graphene oxide electrodes have good regeneration performance. Typically, in the 10 adsorption-desorption multicycles, the salt absorption/desorption capacity of the hybrid capacitive deionization system is stable and reversible. This research opened a hopeful window to design and synthesize effective materials to selectively remove the ionic species to purify the water.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12103-12113
·
IF 3.553
Jin Tianxiang,Chen Jianfa,Wang Chunyan,Qian Yong,Lu Limin
A three-dimensional (3D) fluorine-doped graphene aerogel (FGA) with rich semi-ionic C–F bonds was synthesized via a facile hydrothermal method and applied as the electrode material in supercapacitor. A porous 3D network structure with a high specific surface area of the FGA has been confirmed by the combination of scanning electron microscopy, transmission electron microscopy and N 2 adsorption method. X-ray photoelectron spectroscopy spectra indicated that the FGA was doped predominantly with semi-ionic C–F bonds, which ensured the high electronic conductivity and sufficient electrochemistry active sites of FGA. As a result, the FGA electrode showed a high specific capacity of 279.8 F g −1 at a current density of 0.5 A g −1 , which is much better than that of undoped graphene aerogel (UGA, 141.6 F g −1 ). Even though the current density increased to 10 A g −1 , 90.6% of its specific capacitance was retained. The FGA also maintained about 94.3% of the initial capacitance after 5000 cycles at a current density of 0.5 A g −1 . Furthermore, the assembled FGA//FGA symmetric supercapacitor presented a high energy density of 26.2 W h kg −1 at a power density of 899 W kg −1 . Accordingly, this work offers a facile and efficient approach to produce fluorine-doped graphene materials for high-performance supercapacitor applications.
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Soft Matter
·
2019
·Vol. 15
·期 47
·9727-9732
·
IF 3.399
Guanzhou Luo,Li Wang,Xinying Li,Kai Yang,Yongle Luo,Shouping Xu,Pihui Pi,Xiufang Wen
A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM). The as-prepared F-POSS-OM surface displayed a cohering hierarchical nano-F-POSS polymer granule/micro-Cu(OH)2 wire structure, which provided a re-entrant geometry needed for liquid-repellency and low liquid sliding angles (<15°). Moreover, the easy-prepared structure endows the F-POSS-OM with remarkable durability for mechanical and chemical damages, including wear abrasion, tape-peeling, 100 cm-height hammer impact, severe hand twisting, strong acid/base/salt solutions, and high temperatures. Importantly, F-POSS-OM still retained excellent self-cleaning performance even after being subjected to these damages.
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Sustainable Energy & Fuels
·
2022
·Vol. 7
·期 2
·398-408
·
IF 6.813
Zhi Zou,Shuo Meng,Xiaolei Bian,Longcheng Liu
The generation of electricity from salinity difference energy between seawater and freshwater through a Capacitive Mixing (CapMix) system with solid electrodes was limited by intermittent energy production. In this study, a single-cell CapMix system using flow-electrode (F-CapMix) with a cross-chamber configuration was examined to produce electricity continuously from simulated seawater and freshwater. The effects of the flow-electrode electrolyte concentration, activated carbon loading, amounts of carbon black, and connected external resistance on the system performance were investigated. The results suggest that the system performance can be enhanced by increasing the activated carbon loading and carbon black amounts. Furthermore, to achieve the maximum power density of the system, the external resistance should be matched to the internal resistance. The maximum power density of the presented single-cell F-CapMix system was 74.3 mW m−2, which was comparable to those of previous CapMix and F-CapMix systems. In addition, this study also reveals that using only carbon black as the flow electrode is capable of producing electricity continuously for long-term operation. In summary, these results indicate the potential of F-CapMix and provide developing directions for further optimization.
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CARBON
·
2023
·
IF 10.9
Guodong Shi,Jian Song,Xiaoxiao Tian,Tongtong Liu,Zhanjun Wu
Graphene oxide (GO) is an ideal reinforcement for improving mechanical properties of epoxy (EP) and reducing its coefficient of thermal expansion (CTE). However, the poor interfacial interaction between GO and polymer matrix seriously hinders the reinforcing effect of GO. To improve their interface, we first functionalized GO with flexible polyetheramine (PEA) and f-SiO 2 rigid nanoparticles, obtaining PEA-GO and SiO 2 -PEA-GO hybrids, respectively. Then the PEA-GO and SiO 2 -PEA-GO were incorporated into EP to obtain nanocomposites with flexible interphases and rigid-flexible interphases, respectively. The interfaces were tuned by two PEA molecules (D230 and D2000) with different chain lengths. The effects of the different interface structures on the mechanical properties and CTE of the GO/EP nanocomposites with a 0.25 wt% filler loading were investigated. It was found that the effects of SiO 2 -PEA-GO on strengthening and toughening EP matrix and on reducing its CTE were much better than those of PEA-GO, because the rigid-flexible interfaces provided higher bonding strength and better energy dissipation mechanisms than the flexible interfaces. Moreover, the D230-GO/EP nanocomposite containing shorter PEA (D230) molecules exhibited higher strength but lower toughness and CTE than the D2000-GO/EP nanocomposite. However, the SiO 2 -D2000-GO/EP nanocomposite showed greater strength, toughness and CTE than the SiO 2 -D230-GO/EP nanocomposite. This indicated that the longer PEA molecules in rigid-flexible interphases produced higher improvement in strength and toughness but smaller decreases in CTE. This work provides a promising strategy of constructing an adjustable flexible-rigid interfacial structure and opens an avenue for developing GO/EP nanocomposites with high mechanical properties and low CTE.
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TALANTA
·
2023
·
IF 6.1
Qiong He,Ying Chen,Yuyang Liu,Qiang Wang,Chiyang He,Shaorong Liu
Large–size spherical sorbents with particle size of 10–50 μm are widely applied in separation fields, however it is still a great challenge to synthesize such large–size spherical covalent organic framework (COF). In this work, a type of large–size porous 3D COF was size–controablly synthesized via a two–step strategy, in which a large–size porous 3D spherical polymer was prepared first through a Pickering emulsion polymerization using nano silica as the stabilizer, and subsequently it was converted into porous spherical 3D COF by a solvothermal method . The as–prepared porous spherical COF (COF–320 as a model) showed size–controllable uniform spherical morphology within 15–45 μm, large specific surface area, fine crystalline structure, and good chemical stability. When used as the sorbent for dispersive solid–phase extraction (d–SPE) of bisphenol F (BPF), the porous spherical COF–320 (15 μm) displayed high adsorption capacity ( Q max = 335.6 mg/g), high enrichment factor (80 folds), and good reusability (at least five cycles). By coupling the d–SPE method to HPLC, a new analytical approach was developed and successfully applied to the determination of trace BPF in two water samples, an orange juice and a standard sample with recoveries of 96.0–102.2 % (RSD = 1.1–1.5 %), 95.7–97.4 % (RSD = 1.4–4.4 %) and 98.7 % (RSD = 2.3 %), respectively. The limit of detection (S/N = 3) and limit of quantification (S/N = 10) were 0.1 and 0.3 ng/mL, respectively. The new synthesis strategy opens a viable way to prepare large–size porous spherical COFs, and the developed analytical method can be potentially applied to sensitively detect the trace BPF in water samples and beverages.
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JOURNAL OF ETHNOPHARMACOLOGY
·
2023
·
IF 5.4
Lili Song,Jiayi Wang,Jiaxuan Nie,Yue Zhang,Rui Han,Huimin Liu,Ningning Ma,Zhen Yang,Yubo Li
Ethnopharmacological relevance Tripterygium wilfordii Hook. f (TwHF) has been used as a traditional Chinese medicine for the treatment of rheumatoid arthritis and nephritis for hundreds of years. Aim of the study Although the efficacy of TwHF in the treatment of RA is definite, its serious side effects and toxicity have also received close attention from domestic and international researchers, so the clinical application of TwHF has been controversial. Most of the current TwHF toxicity studies have been conducted with animals in normal body states, but ignore the effects in pathological states. In this study, we aimed to find out the material basis and metabolic mechanism of the “toxicity/effectiveness” of TwHF on rat kidneys in different body states by using two-way orthogonal partial least squares (O2PLS) method. Materials and methods In the present study, TwHF was extracted by reflux extraction method using ethanol as the extraction solvent. Firstly, the effects of TwHF on rat kidneys in different body states were first evaluated by detecting creatinine and urea nitrogen levels and morphological changes in kidney pathology identified the components of TwHF in rats in different body states using UPLC-Q-TOF/MS technique. Serum and urine metabolomics were used to search for biomarkers and metabolic pathways by which TwHF exerts renal injury and protection, and finally, O2PLS correlation analysis was used to correlate the components with renal protective and injury biomarkers. Results TwHF was found to have a protective effect on the kidney of RA rats and an injurious effect on the kidney of normal rats at a dose of 11.25 g/kg/d. The UPLC-Q-TOF/MS technique was used to identify 34 components in TwHF extracts; 23 components and 57 metabolites were identified in the administered rats. O2PLS screened three substances as both toxic and pharmacodynamic components of TwHF, namely 3,5-dimethoxyphenyl-2-propenl-ol, kaurane-16,19,20-triol, and demethylzeylasteral + O, and found that these three components may exert nephrotoxic effects via the nicotinic acid and nicotinamide metabolic pathways and nephroprotective effects via the tryptophan metabolic pathway. Conclusion In this study, O2PLS analysis was used for the first time to combine biomarkers and components in vivo and found the material basis and metabolic mechanism of nephrotoxicity and efficacy of TwHF, which provided key clues for further study on the biological mechanism of toxicity and efficacy of TwHF.
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COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yuxiang Li,Kaili Zhang
Metastable intermolecular composites (MICs) comprising solid fuels and oxidizers at nano-scale exhibit high energy densities and fast reaction speeds. As most metal and metalloid fuels are passivated by the natural oxide layer on the surface which acts as a reaction barrier, fluorine-containing oxidizers are of particular interest to promote the reactivity through interfacial fluoridation. In this work, cobalt hydroxy fluoride (Co(OH)F) was introduced as a functional fluorine-containing oxidizer, and core-shell structured Co(OH)F@Al nanoarray was fabricated onto a glass substrate . The thermal behavior and reaction mechanism of pure Co(OH)F and Co(OH)F@Al composites were thoroughly investigated, and Co(OH)F@Al was compared with CoO@Al and Co 3 O 4 @Al with identical morphology. In the Co(OH)F@Al composite, a pre-ignition reaction was observed which was attributed to the etching of Al 2 O 3 shell by HF and the fluoridation of Al core by HF and CoF 2 . With the assistance of pre-ignition reaction, Co(OH)F@Al can complete main exothermal reaction before Al melting in a solid-state mechanism, and its peak temperature is around 200 ℃ lower than those of MICs employing CoO and Co 3 O 4 as oxidizers.
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PHYTOCHEMISTRY
·
2019
·
IF 2.905
Tong-Hua Yang,De-Xiu Yan,Xiao-Yan Huang,Bo Hou,Yun-Bao Ma,Hua Peng,Xue-Mei Zhang,Ji-Jun Chen,Chang-An Geng
Terminthia paniculata (Sanyeqi) is widely used for treating inflammation and rheumatic arthritis in the folk areas of Yunnan province, China. Its total extract was first revealed with xanthine oxidase (XO) inhibitory activity in vitro and anti-hyperuricemic effect in vivo . Bioassay-guided separation on Fr. A5 yielded six chalcone-flavonone heterodimers , termipaniculatones A-F. Their structures were elucidated based on extensive spectroscopic analyses involving HRESIMS, 1D and 2D NMR , UV, IR and [ α ] D , and the absolute configuration of termipaniculatone F was verified by ECD calculation. Termipaniculatones A and E showed obvious XO inhibitory activity with IC 50 values of 55.6 and 89.5 μ M, respectively, which took effects via a mix-type mode. A molecular modeling study revealed that termipaniculatone A was well located into the active site of XO by interacting with Glu802, Arg880, Thr1010 and Val1011 residues. Termipaniculatone A showed anti-hyperuricemic effects by decreasing serum uric acid levels and inhibiting XO activity in both serum and liver on potassium oxonate (PO)-induced hyperuricemia mice, and anti-inflammatory activity through alleviating paw swelling on monosodium urate (MSU)-induced mice, at the concentration of 20 mg/kg. This is the first time to reveal the anti-hyperuricemic and anti-acute gouty arthritis potency of T. paniculata and the characteristic biflavonoids as active constituents, which provides valuable information for searching new XO inhibitors from natural sources.
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危险品化学品经营许可证（带存储）