CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jing Ouyang,Chenghui Zheng,Wei Gu,Yi Zhang,Huaming Yang,Steven L. Suib
To understand the effect of porous parameters and chemical components on CO 2 capturing performance of solid state amine absorbents and their kinetic parameters, a clay mineral-based CO 2 absorbent was prepared by impregnating five different liquid amines onto SiO 2 nanowire clusters from fibrous sepiolite (Sep). Characterization was conducted by XRD, SEM, FTIR, and N 2 adsorption–desorption isotherm, CO 2 adsorption performances were measured by TGA. After acid treatment, the raw Sep mineral changed into amorphous silica nanowires, and the largest S BET of the obtained SiO 2 nanowires reached 320 m 2 /g, which was 8 times larger than the pristine mineral. Amongst the adapted amines, tetraethylenepentamine (TEPA) showed superiority in the CO 2 adsorption capacity. The optimized adsorption capacity reached 3.7 mmol/g at 75 °C from a CO 2 + N 2 mixture on a ∼50 wt% TEPA loaded SiO 2 sample, and the capacity remained 3.6 mmol/g after ten circles of adsorption/desorption tests. The pore size and pore structure of the matrix, rather than the surface area, will obviously affect the adsorption ability of the product. Kinetic parameters for the CO 2 adsorption process fitted well with a fractional-order model, confirming that the CO 2 adsorption process by the solid absorbent should be a combination of both physical and chemical reactions. Results in this article provide detailed parameters for preparing and understanding these clay mineral based solid state CO 2 absorbents.
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Natural Product Communications
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2017
·
IF 0.773
Jiang Liu,Xiansheng Wang,Sheng Geng,Benguo Liu,Guizhao Liang
The α-glucosidase inhibitory activity and behavior of taxifolin was first investigated by spectrofluorimetry and molecular docking. It was found that taxifolin inhibits α-glucosidase in a competitive manner with the IC50 value of 0.16 mg/mL. The intrinsic fluorescence quenching of α-glucosidase in the presence of taxifolin was observed by the static quenching mechanism. According to the thermodynamic study, the complex of taxifolin and α-glucosidase was maintained by van der Waals and hydrogen bonding. The binding mode provided by molecular docking simulation indicated the existence of hydrogen bonding between taxifolin and the amino acid residues of α-glucosidase (Glu429, Asp 568 and Glu771), which coincided with the result of fluorescence analysis.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2012
·Vol. 108
·期 4
·961-965
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IF 1.63
Shao Hao,Zhang Xuebin,Chen Fanyan,Liu Shasha,Ji Yi,Zhu Yajun,Feng Yi
In this paper, smooth α -Fe 2 O 3 nanotubes have been successfully synthesized by electrospinning of ferric nitrate–polyvinyl alcohol solution followed by calcination in air. The morphologies and structures of the samples were characterized by transmission electron microscopy, scanning electron microscopy and X-ray diffraction. The catalytic properties were studied by differential thermal analysis and thermogravimetric analysis. The results indicated that the as-prepared α -Fe 2 O 3 nanotubes showed a continuous morphology and an extremely high degree of crystallization. The average inner and outer diameters of the obtained α -Fe 2 O 3 nanotubes were about 60 nm and 100 nm, respectively. The obtained α -Fe 2 O 3 nanotubes were able to lower the temperature of the high-temperature thermal decomposition of ammonium perchlorate, while they had little effect on the crystallographic phase transformation and the low-temperature thermal decomposition.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Sheng-Ping Guo,Ze Ma,Jia-Chuang Li,Huai-Guo Xue
α -LiFeO 2 and its nanocomposite with porous carbon ( α- LiFeO 2 / PC) is prepared by a simple one-step solid-state method. They are characterized by powder X-ray diffraction, scanning electron microscope, transmission electron microscope, thermogravimetry , differential scanning calorimetry , X-ray photoelectron spectroscopy, Raman spectrum, and BET surface area analysis techniques. When composited with PC, α- LiFeO 2 particles with smaller sizes locate on the surface or insert in the pores of PC. α- LiFeO 2 /PC can deliver the first discharge capacity of 1830 mAh/g, and 792 mAh/g can be maintained after 120 cycles at 0.1 C. Its capacity can reach to 570 mAh/g after 120 cycles even at 1C. The facile preparation method and nice electrochemical data, together with cheap and eco-friendly iron sources, make α- LiFeO 2 /PC a promising anode material for lithium-ion batteries.
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GLYCOCONJUGATE JOURNAL
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2016
·Vol. 33
·期 2
·159-168
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IF 1.828
Liu Fang F.,Kulinich Anna,Du Ya M.,Liu Li,Voglmeir Josef
Two putative α-mannosidase genes isolated from the rather unexplored soil bacterium Solitalea canadensis were cloned and biochemically characterised. Both recombinant enzymes were highly selective in releasing α-linked mannose but no other sugars. The α-mannosidases were designated Sca2/3Man2693 and Sca6Man4191, and showed the following biochemical properties: the temperature optimum for both enzymes was 37 °C, and their pH optima lay at 5.0 and 5.5, respectively. The activity of Sca2/3Man2693 was found to be dependent on Ca 2+ ions, whereas Cu 2+ and Zn 2+ ions almost completely inhibited both α-mannosidases. Specificity screens with various substrates revealed that Sca2/3Man2693 could release both α1-2- and α1-3-linked mannose, whereas Sca6Man4191 only released α1-6-linked mannose. The combined enzymatic action of both recombinant α-mannosidases allowed the sequential degradation of high-mannose-type N-glycans. The facile expression and purification procedures in combination with strict substrate specificities make α-mannosidases from S. canadensis promising candidates for bioanalytical applications.
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PubMed
高影响因子
GLYCOCONJUGATE JOURNAL
·
2016
·Vol. 33
·期 2
·147-157
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IF 1.828
Zhang Wuxia,Li Peng,Song Dan,Niu Hong,Shi Songshan,Wang Shunchun,Duan Jinyou
Radix Paeoniae Alba is widely used in Chinese traditional medicine to treat various diseases such as gastrointestinal disorders, cancer, and other diseases. In this study, two polysaccharides RPAPW1 and RPAPW2 were isolated from Radix Paeoniae Alba by DEAE-52 cellulose chromatography and G-25 sephadex. According to physicochemical methods, NMR and methylation analysis, RPAPW1 and RPAPW2 were established to be α-glucans consisting of predominant 4-linked α- Glc residues branched at O-6 and contained trace amount of protein and uronic acid. Immunological tests indicated that RPAPW1, RPAPW2 and could promote splenocyte proliferation and RAW264.7 phagocytic activity. In vitro , RPAPW1 and RPAPW2 elicited a week reducing power, DPPH scavenging activity and could not protect the PC12 cells from H 2 O 2 damage. These data implied polysaccharides RPAPW1 and RPAPW2 had the potential to be a natural immunopotentiating and antioxidant supplement for preparing functional foods and nutraceuticals.
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PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Juan Zhang,Ying Liu,Xiaonan Wang,Yangyang Chen,Genxi Li
An electrochemical method is established in this work for the assay of α-glucosidase activity and the inhibitor screening through one-step displacement reaction, which can be directly used in cell medium. The displacement reaction can be achieved via strong binding of 4-aminophenyl-α- d -glucopyranoside (pAPG)/magnetic nanoparticles (MNPs) to pyrene boric acid (PBA) immobilized on the surface of graphite electrode (GE), compared to that of dopamine (DA)/sliver nanoparticles (AgNPs). Since α-glucosidase can specifically catalyze MNPs/pAPG into MNPs/pAP which has no binding capacity with PBA, the activity of both isolated and membrane bound enzyme can be well evaluated by using this proposed method. Meanwhile, signal amplification can be accomplished via the immobilization of DA at the outer layer of AgNPs , and the accuracy can be strengthened through magnetic separation. Moreover, this method can also be utilized for inhibitor screening not only in the medium containing the enzyme but also in cell medium. With good precision and accuracy, it may be extended to other proteases and their inhibitors as well.
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2015
·Vol. 33
·期 8
·1140-1149
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IF 1.835
Wu Lian-ying,Yu Lei,Fu Xiao-hui,Li Zhi-bo
A series of monomethoxy poly(ethylene glycol) (mPEG) grafted copolyglutamates (PmPEGs) were synthesized through ring-opening polymerization (ROP) followed by click chemistry. Supramolecular hydrogels based on polymer inclusion complexes (ICs) between PmPEG and α -cyclodextrin ( α -CD) were prepared in aqueous solution. The rheological measurements indicated their gelation properties were affected by several factors including the mPEG length, graft density and the sample concentration. These hydrogels displayed thermo-sensitive gel-sol transition under appropriate conditions due to the reversible mPEG and α -CD inclusion complexation. These hydrogels also showed pH-sensitive behavior due to the deprotonate of carboxylic acid side groups. The ICs formation of a channel-type crystalline structure induced gelation mechanism was verified by various techniques. In vitro cytotoxicity assays demonstrated that the supramolecular hydrogels are nontoxic and cytocompatible.
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RSC Advances
·
2015
·Vol. 5
·期 117
·96685-96694
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IF 3.84
Feng Ding,Sizhao Zhang,Xuegang Luo,Xiaoyan Lin
The treatment of organic dyes is often conducted using the photocatalytic technique, however, the necessity for ultraviolet irradiation and efficient degradation still limit its wide practical application. Here, we report on a facile and effective co-precipitation hydrothermal method for fabricating Ag3PO4/α-Bi2O3 (AB) hierarchical heterostructures with an improved visible-light response. Rod-like α-Bi2O3 was firstly prepared under hydrothermal conditions, and then silver nitrate and disodium hydrogen phosphate were successively added to form AB. The measurement results signify that heterojunctions of polyhedral Ag3PO4 adhered to rod-like α-Bi2O3 were apparently found. AB possesses a markedly enhanced photocatalytic performance and outstanding ability in decomposing methylene blue (MB), methyl orange (MO) and rhodamine B (RhB) under visible light, compared to pure α-Bi2O3 or Ag3PO4. The amount of silver ions released reveals that the formation of α-Bi2O3 could enhance the stability of the AB composites. The fluorescence tests indicate that AB is helpful in producing the ˙OH radicals responsible for enhanced photocatalytic activity. The degradation rate could be maintained even after three degradation cycles, suggesting an admirable chemical and physical stability of AB. In addition, a possible mechanism for the enhanced photocatalytic properties of AB was also discussed.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 11
·8780-8786
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IF 3.086
Jinhua Zhou,Juan Song,Huihua Li,Xiaomiao Feng,Zhendong Huang,Shufen Chen,Yanwen Ma,Lianhui Wang,Xiaohong Yan
Novel nanoflake-like and nanobelt-like α-MoO3/graphene nanocomposites were synthesized by a facile hydrothermal method through tailoring the content of Mo source. The formation mechanisms of α-MoO3/graphene nanocomposites with different morphologies has been investigated. As a model, the α-MoO3/graphene nanocomposites were studied for electrochemical energy storage supercapacitor devices. The results showed that α-MoO3 nanoflakes/graphene displayed better supercapacitive performances than that of α-MoO3 nanobelts/graphene, arising from the structural superiority and optimum compositions. The best composite exhibited a high specific capacitance (up to 360 F g−1) at a current density of 0.2 A g−1, good rate capability, and a nearly 100% long-term cycle stability. This study provided a facile and optimal experimental design to prepare α-MoO3/graphene composite materials which act as promising electrode materials for high-performance supercapacitors.
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CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Lin Gan,Zhi-Yong Mao,Yi-Fei Wang,Fang-Fang Xu,Ying-Chun Zhu,Qing Huang,Xue-Jian Liu
Cerium-doped Ca–α-SiAlON phosphors with Ca n −1.5 x Si 12− m − n Al m + n O n N 16− n :Ce x ( m =2 n , 0.8≤ m ≤2.4, and 0.02≤ x ≤0.40) nominal compositions have been synthesized by gas pressure sintering (GPS). The photoluminescence (PL) properties were studied in relation to phase composition, particle morphology , and microstructure. Continuous addition of Ce rare-earth (RE) could enhance the emission intensity of phosphors, which was partially attributed to the formation of increased amount of planar defects where dense doping of Ce ions is achieved. Such enhancement could hold up to x =0.32, above which the emission intensity fell slightly due to the formation of more secondary phases and a surface glassy phase rather than concentration quenching. Finally, possible ways to improve the luminescence properties of Ce-doped α-SiAlON phosphors were discussed through tailoring the composition and microstructure.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2015
·
IF 2.551
Guibin Lu,Caixing Zhang,Liping Chen,Wanghua Chen,Ting Yang,Yishan Zhou
To study the thermal hazard of β-nitroso-α-naphthol, both dynamic and isothermal tests were performed with a differential scanning calorimeter (DSC). The dynamic tests indicated that the initial decomposition temperature of β-nitroso-α-naphthol ranged from 153 °C to 173 °C. The interrupt-rescanning method verified the autocatalytic characteristic of β-nitroso-α-naphthol decomposition. DSC curves obtained at five constant temperatures confirmed that the decomposition of β-nitroso-α-naphthol was an autocatalytic reaction. Activation energy E was 149 ± 8 kJ mol −1 calculated by Kissinger method. E values calculated by induction period method and isothermal method were in line with that obtained by Friedman method. On the basis of the kinetic analysis, the safety parameter SADT of β-nitroso-α-naphthol in 50 kg standard packaging was 81 °C based on Semenov model and 67 °C based on Frank-Kamenetskii model.
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