JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 14
·6017-6029
·
IF 3.553
Liang Shujie,Han Cuilian,Meng Qinghan,Tian Guiying
In this study, a nitrogen and sulfur co-doped sodium titanium phosphate/hole graphene (N,S-NTP/rHGO) was synthesized by one-step hydrothermal method using thiourea as N/S source. The microstructure characterization confirms that N and S heteroatoms have been integrated into the graphene skeleton. The electrochemistry and electrosorption properties of the N,S-NTP/rHGO electrodes were investigated for hybrid capacitor deionization (HCDI). The results indicate that the specific capacitance of N,S-NTP/rHGO electrodes can reach 530.46 F g −1 at a scan rate of 0.2 mV s −1 , which is 33.8% higher than that of the sample without doping. Moreover, the HCDI cell based on the N,S-NTP/rHGO-2 shows a high desalination capacity of 36.87 mg g −1 and a rapid ion removal rate of 0.66 mg g −1 s −1 , which is more than twice as high as the sample without doping (0.3 mg g −1 s −1 ) at an initial NaCl concentration of 800 mg L −1 and applied voltage of 1.4 V. Further, the N,S-NTP/rHGO electrode exhibits excellent regeneration ability. Therefore, this study suggests that as-prepared N,S-NTP/rHGO composite exhibits a great potential application for high-performance HCDI systems.
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 5
·1289-1297
·
IF 5.958
Zhaoyang Wang,Jinmei Liu,Zijuan Du,Haizheng Tao,Yuanzheng Yue
Na3V2(PO4)3 (NVP) features a three-dimensional open structure, which allows fast migration of Na+ ions, and thus, NVP is a superior cathode material for sodium ion batteries. However, the application of the NVP cathode is limited by its low electronic conductivity. To overcome this limitation, we developed an NVP nanocomposite cathode by doping carbon with bromine (Br) and nitrogen (N) during the sol–gel assisted hydrothermal reaction. The Br- and N-doping leads to the formation of amorphous carbon (a-C) on the surface of NVP particles. The nanocomposite possesses multilevel structures containing both pores with different sizes and aggregated grains (200–300 nm). Since the doped N provides electrons to the carbon matrix, the electronic conductivity of the nanocomposite is enhanced. Br-Doping leads to the drop of activation energy for V4+/V5+ redox reaction. The nanocomposite cathode exhibits a high reversible capacity of 41 mA h g−1 at 10C. Both the superior rate and cycling performances could be attributed to the synergistic effect of the multilevel structure and amorphous carbon.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yuebo Li,Haina Qi,Yunrui Xie,Liu Yang,Wensheng Yu,Qianli Ma,Xiangting Dong,Dan Li,Guixia Liu,Jinxian Wang
CaF 2 :Eu 2+/3+ one-dimensional nanostructures including nanofibers , hollow nanofibers and nanobelts are respectively constructed via a newly-proposed technique of high-efficient combination of electrospinning with bi-crucible fluorinating technique. The diameters of CaF 2 :Eu 2+/3+ nanofibers and hollow nanofibers are respectively 328 ± 2 nm and 290 ± 5 nm, and the width and thickness of nanobelts are 1.07 ± 0.013 μm and 150 nm, respectively. Under the excitation of 276-nm or 320-nm ultraviolet light, CaF 2 :Eu 2+/3+ nanostructures exhibit characteristic emission peaks at 385 nm (purple) and 615 nm (red) assigned to 4f 6 5 d 1 (t 2g )→ 8 S 7/2 energy levels transition of Eu 2+ ions and 5 D 0 → 7 F 2 energy levels transitions of Eu 3+ ions, respectively. XPS data further confirm the coexistence and proportion of Eu 2+ and Eu 3+ in the samples. CaF 2 :9%Eu 2+/3+ nanofibers possess the highest luminescent intensity. White-emitting and color-tunable photoluminescence performance of CaF 2 :Eu 2+/3+ nanostructures are realized by regulating the proportion of Eu 2+ to Eu 3+ ions, and luminescence mechanism is also proposed. Further, it is satisfactorily found that the proportion of Eu 2+ to Eu 3+ ions can be modulated by adjusting the Eu-doped concentration and calcination temperature. The detailed formation mechanisms of CaF 2 :Eu 2+/3+ one-dimensional nanostructures are advanced, and the neoteric fabrication technique is successfully established. This design conception and construction strategy can provide some guidance for fabricating other one-dimensional nanostructures.
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Biology-Basel
·
2020
·Vol. 9
·期 8
·205
·
IF 3.796
Xi Yang,Hanju Sun,Lijun Tu,Yuan Jin,Zuoyong Zhang,Muwen Wang,Shuyun Liu,Ying Wang,Shudong He
The interest in anthocyanins used in food, cosmetic, and pharmaceutical industries has increased the research in order to improve their stability while maintaining bioactivity. In this work, cyanidin-3-glucoside lauryl ester (Cy3glc-C12) was enzymatically synthesized, using Novozym 435 as a catalyst, as well as to obtain a kinetic model for the bioprocess. Its liposolubility, UV–VIS absorbance property, thermostability, and potential proliferative effect on intestinal probiotics were also studied. The maximum conversion yield (68.7 ± 2.1%) was obtained with a molar ratio (substrate:donor) of 1:56, 435 16.5 g/L Novozym, temperature of 56 °C, and a time of 28 h via the acylation occurred at 6′′-OH position of the glucoside. The kinetics of the reaction is consistent with a ping-pong bi-bi mechanism and the parameters of the respective kinetic equations are reported. Compared with native Cy3glc, the liposolubility, pH resistivity and thermostability of Cy3glc-C12 were significantly improved. The growth kinetics ofBifidobacteriaandLactobacilluswas established based on the Logistic equation, and Cy3glc-C12 could promote their proliferation especially during the logarithmic growth, in which lower pH and more bacteria population were found compared with those of media without anthocyanins. This research provided a reference for the industrial production of Cy3glc-C12 and extended its application to natural products in lipophilic systems.Keywords:Cyanidin-3-glucoside;kinetic model;enzymatic synthesis;physicochemical property;proliferative effect;intestinal probiotics
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiangxiang Li,Peng Gao,Jiangtao Li,Li Guan,Xuanlin Li,Fenghe Wang,Dawei Wang,Zhiqiang Li,Xu Li
Trivalent Er 3+ -doped La 2 (MoO 4 ) 3 upconversion phosphors with intense green emmision were synthesized at 800 °C by the solid-state reaction route, promoting the development of novel optical thermometry. The color emitted from the samples was minorly affected by the excitation power and doping concentration. Yb 3+ is a better sensitizer for the La 2 (MoO 4 ) 3 : Er 3+ phosphor and it can enhance the emission intensity when a certain amount is co-doping in the system. The up-conversion luminescent mechanism was investigated using the pump power-dependent UC emission spectra. Alkali metal doping increased the up-conversion emission intensities drastically, and Li + ions can enhance the luminous intensity by more than 20 times. The fluorescence intensity ratio of the transition emission 2 H 11/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 was used to study upconversion optical temperature sensing. The sensitivity changes from doping with diverse alkali metal ions and their effects on the optimal temperature range are discussed in detail. Alkali metal ions doping extended the temperature range, indicating that this phosphor is a potential candidate for temperature-sensing probes.
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TOXICOLOGICAL SCIENCES
·
2020
·Vol. 175
·期 2
·279-291
·
IF 3.703
Li Caiyu,Wang Xue,Bi Yajuan,Yu Heshui,Wei Jing,Zhang Yi,Han Lifeng,Zhang Youcai
Organic anion transporters 1 and 3 (OAT1 and OAT3) play a critical role in renal drug-drug interactions and are involved in the nephrotoxicity of many anionic xenobiotics. To date, relatively little is known about the interaction of natural compounds with OAT1 and OAT3. Of the 270 natural compounds screened in the present study, 21 compounds inhibited OAT1 and 45 compounds inhibited OAT3. Further concentration-dependent studies identified 7 OAT1 inhibitors and 10 OAT3 inhibitors with IC50 values of <10 μM, and most of them were flavonoids, the most commonly ingested polyphenolic compounds in the diet and herbal products. Computational modeling of OAT1 and OAT3 revealed the important residues for the recognition of inhibitors. The two strong OAT inhibitors, namely wedelolactone and wogonin, were evaluated for their in vivo interactions with the OAT substrate aristolochic acid I (AAI), a natural compound causing aristolochic acid-induced nephropathy (AAN) in many species. The cytotoxicity of AAI increased in two OAT-overexpressing cell lines, with more cytotoxicity in OAT1-overexpressing cells, suggesting a more important role of OAT1 than OAT3 in AAN. Both wedelolactone and wogonin markedly increased serum AAI concentrations in AAI-treated rats and ameliorated kidney injuries in AAI-treated mice. To conclude, the present findings are of significant value in understanding natural compound-drug interactions and provide a natural source for developing treatments for AAN.
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JOURNAL OF FOOD BIOCHEMISTRY
·
2020
·Vol. 44
·期 10
·e13420
·
IF 1.662
Cheng Hu,Ying Chen,Yiyuan Cao,Yiqun Jia,Jiaqi Zhang
We investigated the protective effect of Hyperoside (HPS) on liver injury induced by acetaminophen (APAP) in C57 mice. HPS was administered orally for 7 days and APAP was administered orally on the 7th day. Serum and liver samples were then collected for biochemical analyses, histopathology assessments, and metabolomics studies. Metabolites were assessed using a UHPLC-MS system. Principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) were used to process the data. Pathway analyses were performed using Metaboanalyst 4.0. Western blot and qRT-PCR were used to determine the protein and mRNA levels, respectively. HPS interacted with active sites in CYP2E1 and caused protein degradation. In conclusion, our results suggested that HPS prevented the oxidative stress-induced liver injury caused by APAP. Practical applications Hyperoside was shown to have potential protective and therapeutic effects against liver diseases. Male C57 mice were used to perform pharmacodynamic, pharmacology, and metabolomics evaluations. At a dose of 60 mg/kg, HPS prevented oxidative stress-induced liver injury caused by APAP by regulating the glutathione-related metabolites and enzymes through the inhibition of CYP2E1.
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PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Zhe-Ming Wu,Chang-Ling Hao,Tao Tong,Ren-Chao Zheng,Yu-Guo Zheng
( S )-3-Cyano-5-methylhexanoic acid (( S )-CMHA) is the key chiral intermediate of pregabalin . In this paper, an aqueous two-phase system (ATPS) was developed to extract ( S )-CMHA from nitrilase-catalyzed bioconversion broth. Inorganic salts and hydrophilic solvents were screened to form ATPS, among which an acetone/ammonium sulfate ATPS was investigated in detail, including phase diagram, effect of phase composition and stability of ( S )-CMHA. The maximum product recovery of 99.15% was obtained by an optimized ATPS system composed of 15% (w/w) ammonium sulfate and 35% (w/w) acetone with the removal of 99% cells and 86.27% proteins. The total ( S )-CMHA yield reached 92.11% after back-extraction. The recycling use of ammonium sulfate was investigated, and 93.10% of salt in the salt-rich phase was recovered with the addition of methanol. The results demonstrated the efficiency of the two-step extraction process for separation of ( S )-CMHA.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1451-1463
·
IF 3.917
Zhou Lipeng,Gao Dongting,Yang Jingru,Yang Xiaomei,Su Yunlai,Lu Tianliang
Abstract Conversion of cellulose to chemicals is an economic and environmental route for biomass utilization. In this work, efficient conversion of cellulose to alkyl levulinates and levulinic acid was realized by oxidation pretreatment combined with alcoholysis over Al 2 (SO 4 ) 3 catalyst. Proper pre-oxidation conditions including oxidation temperature and time are important. By pre-oxidation, part of hydroxymethyl groups on cellulose was converted to carboxyl groups which provide the Brønsted acid sites near the glycosidic bonds to improve the depolymerization of cellulose to monosaccharide. Al 2 (SO 4 ) 3 ·18H 2 O can play both Brønsted and Lewis acid roles in methanol and catalyze the conversion of monosaccharide to alkyl levulinates and levulinic acid. After pre-oxidation at optimized conditions, cellulose can be converted into methyl levulinate and levulinic acid over Al 2 (SO 4 ) 3 in methanol efficiently, and total yield of methyl levulinate and levulinic acid can reach 66.8% at 180 °C for 3 h. Furthermore, the simple and cheap Al 2 (SO 4 ) 3 catalyst is recyclable which is important for the practical application. Graphic abstract
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CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jing Hu,Kokoette Effiong,Muyuan Liu,Xi Xiao
Allelochemicals derived from plants have shown great potential in mitigating harmful algal blooms (HABs), although different algal species can respond differently to these chemicals. Therefore, we first investigated the allelopathic effects of two newly identified plant-derived allelochemicals, 1,2-benzenediol (1,2-BD) and 3-indoleacrylic acid (3-IDC), on six algal species. Then we further evaluated the allelopathic responses of two bloom-forming species, Microcystis aeruginosa FACHB-905 and Heterosigma akashiwo to 1,2-BD. Results showed that 1,2-BD had a broader antialgal spectrum than 3-IDC. Allelopathic response analysis indicated that 1,2-BD consistently and stably inhibit the growth of M. aeruginosa FACHB-905, with inhibitory mechanism being disruption of photosynthetic activity, overwhelming of the antioxidant system and activation of programmed cell death (PCD). H. akashiwo displayed resistance to 1,2-BD during exposure, and the growth inhibition was mainly attributed to PCD. Therefore, the species-specific allelopathic responses provide new insights for controlling HABs using 1,2-BD and 3-IDC.
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高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yingying Zhu,Yang Xu,Siqi Chen,Yifan Zhou,Jinyuan Zhu,Geng Chen
Titanium dioxide (TiO2) nanoparticles act as very good nanofillers to prepare the polymeric nanocomposite membranes to tackle the problem of heavy metal pollution in the water body. A key challenge to be solved is to improve their compatibility with organic matrices and dispersion in the material. Herein, (3-aminopropyl)trimethoxysilane-modified TiO2 (APTMS-TiO2) was prepared using coupling agent modification, and APTMS-TiO2 thin-film nanocomposite (TFN) membrane was successfully applied in the forward osmosis (FO) process. Moreover, the effects of different pretreated TiO2, TiO2 dosages, draw solution types, and concentrations on FO membranes were systematically studied. Results showed that APTMS-TiO2 TFN with a TiO2 dosage of 0.05 wt % has the maximal water permeate flux (Jw) (18.14 LMH, 225.09% higher than the control TFC of 5.58 LMH) and the minimum specific reverse solute flux of 0.40 g/L with 1 M NaCl as the draw. Unary (Cu2+ and Ni2+) and binary (Cu2+ + CR and Cu2+ + RhB) high-salt wastewater were applied as the feed to investigate the reusability and dye rejection of the APTMS-TiO2 TFN. The rejection rate of Cu2+ and Ni2+ by APTMS-TiO2 TFN was above 98.00 and 97.00%, respectively, while the rejection rate of Cu2+ + CR and Cu2+ + RhB was 96.87 and 95.83%, respectively, indicating excellent reusability and rejection. The present research finding concludes that the incorporation of APTMS-TiO2 nanosheets in the TFN layer enhances the flux and rejection of targeted mineral salts. Additionally, the APTMS-TiO2 TFN revealed outstanding rejection performance of unary and binary wastewaters, signifying that contact with heavy metals and colored solutes will not affect the performance.
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