JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Kaifei Zhao,Peng Yang,Shichao Du,Kangli Li,Xiaona Li,Zhenfang Li,Yumin Liu,Lanlan Lin,Baohong Hou,Junbo Gong
A laser monitoring dynamic method was used to determine the solubility of 4-aminobutyric acid in five mono-solvents of methanol, formamide, 1,2-propanediol, 1,3-propanediol and water, and (methanol + water) binary solvent mixtures over the temperature ranging from 283.15 K to 323.15 K at atmospheric pressure. It turns out to be that in different mono-solvents, the solubility of 4-aminobutyric acid is temperature dependent and increases with the increasing temperature. While in (methanol + water) binary solvent mixtures, the solubility is positively correlated with temperature and negatively correlated with the mole fraction of methanol. The modified Apelblat equation, λh equation and NRTL_Binary model were employed to correlate the solubility data in five mono-solvents. While in (methanol + water) binary solvent mixtures, the NRTL_Ternary model, CNIBS/R-K model and Jouyban-Acree models were applied. It is found that the correlated results are in good agreement with the experimental results. Furthermore, with the activity coefficients considered, solution mixing thermodynamics were calculated and the dissolution process of 4-aminobutyric acid is also discussed.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 27
·22827-22838
·
IF 3.289
Li Guan,Yanfeng Hao,Lei Chen,Meng-Lin Wei,Qin Jiang,Wen-Yuan Liu,Yan-Bo Zhang,Jie Zhang,Feng Feng,Wei Qu
A series of 4-O-substituted chrysotoxine (CTX) derivatives were designed, synthesized and evaluated as multifunctional agents for the treatment of Alzheimer's disease (AD). In vitro assays indicated that four ring substituted compounds (2a, 2b, 3i and 3j) exhibited significant neuroprotective effects against Aβ25–35-induced toxicity in PC12 cells. The four compounds also inhibited self- and Cu2+-induced Aβ1–42 aggregation and acted as biometal chelators. In particular, compound 2a was a potential lead compound for AD treatment (cell viability up to 100.78% at 50 µM in Aβ25–35-treated PC12 cells, 51.88% and 58.03% inhibition at 25 µM for self- and Cu2+-induced Aβ1–42 aggregation, respectively). A metal chelating experiment showed that compound 2a had a moderate interaction with Cu2+ and Al3+. Moreover, western blot analysis showed that compound 2a attenuated Aβ-induced tau protein hyperphosphorylation at Ser199/202 and Ser396 sites. Furthermore, compound 2a could efficiently cross the blood-brain barrier (BBB) by a parallel artificial membrane permeability assay (PAMPA). In summary, these results suggested that compound 2a was a promising multifunctional compound for AD therapy.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 4
·212-220
·
IF 4.367
Mei Lei,Wei Wu,Shuanglei Yang,Xingang Zhang,Zhuo Xing,Feng Ren,Xiangheng Xiao,Changzhong Jiang
The reduction of 4-nitrophenol (Nip) into 4-aminophenol (Amp) by NaBH 4 , which is catalyzed by both binary and ternary yolk–shell noble-metal/SnO 2 heterostructures, is reported. The binary heterostructures contain individual Au or Ag nanoparticles (NPs) and the ternary heterostructures contain both Au and Ag NPs. The Au@SnO 2 yolk–shell NPs are synthesized via a silica seeds-mediated hydrothermal method. Subsequently, the Au@SnO 2 @Ag and Au@SnO 2 @Au yolk–shell–shell (YSS) NPs are synthesized, whereby SnO 2 is located between the Au and Ag NPs. The morphology, composition, and optical properties of the as-prepared samples are analyzed. For the binary heterostructures, the rate of the reduction reaction increases with decreasing particle size. The catalytic results demonstrate the synergistic effect of Au and Ag in the ternary metal–semiconductor heterostructures, which is beneficial to the catalytic reduction of Nip into Amp. Both the binary and ternary heterostructures exhibit significantly better catalytic performances than the corresponding bare Au and Ag NPs. It is envisaged that the current synthesized strategy will promote further interest in the field of bimetal NP-based catalysis.
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TETRAHEDRON
·
2016
·
IF 2.645
Xiong-Wei Liu,Zhen Yao,Jun Yang,Zhi-Yong Chen,Xiong-Li Liu,Zhi Zhao,Yi Lu,Ying Zhou,Yu Cao
A facile and efficient methodology was developed for the synthesis of isoxazole-fused spiropyrrolidine oxindoles 3–5 via a 1,3-dipolar cycloaddition reaction of 3-methyl-4-nitro-5-alkenyl-isoxazoles with azomethine ylides (thermally generated in situ from isatin derivatives and proline or thioproline or sarcosine). Products bearing adjacent quaternary-tertiary centers were smoothly obtained in high yields (up to 90% yield) with good diastereoselectivity (up to 20:1). Furthermore, their biological activity has been preliminarily demonstrated by in vitro evaluation against human prostate cancer cells PC-3, human lung cancer cells A549 and human leukemia cells K562 by the MTT-based assays using the commercially available standard drug Cisplatin as a positive control. These results suggested that most of isoxazole-fused spiropyrrolidine oxindoles 3–5 showed considerable cytotoxicities to these three cell lines K562, A549 and PC-3, and that isoxazole-fused spiropyrrolidine oxindoles may be potential leads for further biological screening.
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SOLAR ENERGY
·
2017
·
IF 4.018
Yingli Pei,Jing Guo,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Qingwen Tian,Yuena Meng,Sixin Wu
The doping of indium into absorber layer has been proven to be beneficial for hybrid buffer structured Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells, but it is difficult to precisely control the doping content only relying on In diffusion from In 2 S 3 emitter. Herein, we use the solution method to prepare In-substituted CZTSSe layer by directly doping In 2 Se 3 into metal chalcogenides precursor solution. The doping content can be precisely controlled and the influences of indium doping on cell performance are systematically discussed. Mott-Schottky and resistivity measurements indicate that the carrier concentration and charge transport process are monotonically enhanced with increasing In/(In + Sn) content (0 at.%, 3 at.%, 6 at.% and 12 at.%). The improvements of series resistance also lead to a monotonic increase of fill factor ( FF ) from 52.1% to 64.8%. Due to the larger recombination at high doping content, the 6 at.% In content device finally contributes the highest power conversion efficiency of 8.47%. It is expected that a precisely controlled indium doping could further improve cell performance for efficient hybrid buffer structured devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Nagaraj Basavegowda,Kanchan Mishra,Yong Rok Lee
Novel FeAgPt alloy nanoparticles were biosynthesized via ultra-sonication using the root extract of Platycodon grandiflorum . The nanoparticles exhibited enhanced catalytic activities in the reduction of 4-nitroaniline (4-NA) to p -phenylenediamine with a significantly reduced reaction time and increased rate constant because of their high number of active surface sites. In addition, the same catalyst exhibited enhanced catalytic activity in the decolorization of an environment polluting dye, rhodamine B (RhB). The time taken for the complete conversion of 4-NA to p -phenylenediamine was 25 min with an apparent rate constant of 10.06 × 10 −2 min −1 . Similarly, the catalytic decolorization of RhB took 15 min for complete decolorization of the dye molecules with a rate constant 25.60 × 10 −2 min −1 . The performance difference of mono, bi and trimetallic nanoparticles for both the reduction of 4-NA and decolorization of RhB was also examined. These trimetallic alloy nanostructures with excellent catalytic efficiency can also be used for other applications.
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JOURNAL OF SOLID STATE CHEMISTRY
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2017
·
IF 2.299
Tong-Ying Chang,Chun-Li Hu,Dong Yan,Jiang-Gao Mao
Two new phosphates, non-centrosymmetric (NCS) (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 and centrosymmetric (CS) Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 have been prepared by hydrothermal reactions . The single-crystal X-ray structural analyses have shown that they crystallized in space group P −42 1 c and P2 1 /c , respectively·(H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 features a three-dimensional (3D) network structure composed of ZnO 4 and PO 4 tetrahedra that are interconnected via corner-sharing, forming 1D channels of 6-MRs and 8-MRs which are filled by Ca 2+ and H 3 O + cations, respectively. Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 features a layered [Cd 3 (PO 4 ) 2 (HPO 4 ) 2 ] 4- composed of 1D chain of edge-sharing CdO 6 octahedra that are further bridged by PO 4 tetrahedra with Ba 2+ cations filling the interlayer spaces. Luminescent studies suggest that (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 emits blue light. Optical diffuse reflectance spectra show the experimental band gaps for (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 and Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 are 5.67 eV and 5.68 eV, respectively. The UV cut-off edge of title compounds are around at 218 nm·(H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 exhibits a very weak SHG response.
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SYNTHETIC METALS
·
2016
·
IF 2.299
Libo Sun,Xun Sun,Yuhua Zheng,Qingquan Lin,Huijuan Su,Caixia Qi
Herein, polystyrene/polyaniline/Au (PS/PANI/Au) composites were prepared by a novel method using self-made Au(en) 2 Cl 3 as the Au source and were used as the catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Before the preparation of PS/PANI/Au, PS microparticles were sulfonated by the copolymerization between styrene and sodium 4-styrenesulfonate (SSS). Then self-made Au(en) 2 Cl 3 was added and Au(en) 2 3+ species were adsorbed on the surface of sulfonated PS particles due to the electrostatic attraction. The Au(en) 2 3+ was then reduced to Au nanoparticles in situ by aniline monomer. After the polymerization of the residual aniline monomer by ammonium persulfate (APS), the PS/PANI/Au composite catalysts were obtained. The morphology and structure of the as-prepared PS/PANI/Au composites were characterized by TEM, FT-IR, XPS and EDX. Their catalytic performance for the reduction of 4-NP by NaBH 4 was evaluated by means of UV–vis spectroscopy. The as-prepared PS/PANI/Au composites are very active for the reduction of 4-NP by virtue of the interaction between Au nanoparticles and PANI shell. The catalytic reaction obeys the pseudo-first-order reaction equations and the reaction rate constants are also calculated in this paper.
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ANALYST
·
2015
·Vol. 140
·期 17
·5944-5952
·
IF 4.107
Shaoyan Zhou,Zheng Li,Xueju Lv,Bin Hu,Qiong Jia
Here, we synthesized a novel organic–inorganic hybrid material combining carboxylatocalix[4]arenes and magnetic zeolites by covalent bonding. The complex was characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transformed infrared spectroscopy, X-ray diffraction spectrometry, thermogravimetric analysis/differential thermal gravity analysis, and by using an X-ray photoelectron spectrometer and a vibrating sample magnetometer. The resulting magnetic composite was employed as a solid phase adsorbent to separate and preconcentrate synthetic phenolic antioxidants. Various interactions between the targets and the adsorbent contributed to the adsorption efficiency including hydrophobic interaction, hydrogen-bond interaction, and π–π complexation. The superparamagnetic participation in the process of synthesizing zeolites made the separation process of adsorbent from solutions convenient by an external magnetic field. Taking advantage of this property, this adsorbent could be recycled more than 30 times. The concentrations of the preconcentrated SPAs were determined directly by high-performance liquid chromatography. Various experimental parameters were optimized, according to which the method was evaluated. Finally, the prepared magnetic zeolite@carboxylatocalix[4]arene was successfully applied to identify synthetic phenolic antioxidants from juice and infant milk powder samples with high enrichment factors in the range of 41.9–92.5. The magnetic materials allowed rapid and simple preconcentration, implying their potential in the field of adsorption.
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PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2015
·
IF 1.587
Hong-Yu Luo,Min Zhang,Nai-Chao Si,Min-Jia Meng,Li Yan,Wen-Jing Zhu,Chun-Xiang Li
In this study, novel molecularly imprinted open porous membranes (MIOPMs) were prepared using the Pickering HIPEs template method and molecular imprinting technology for selective adsorption and separation of methyl 4-hydroxybenzoate (M4HB). The template M4HB, functional monomers, crosslinker and plastifier 2-ethylhexyl acrylate (2-EHA) were contained in the oil phase. Hydrophobic silica nanoparticles (HNP-SiO 2 ) were employed as a stabilizer to establish stable W/O Pickering HIPEs with nonionic surfactant sorbitantrioleate (Span 85). The results of SEM and FTIR indicated that the optimal MIOPMs were prepared successfully and possessed open and interconnecting pores. Then, the MIOPMs were used as sorbents for M4HB. The correlation coefficient ( R 2 ) values for the Langmuir–Freundlich isotherm model and pseudo-second-order kinetic model fitting to the adsorption equilibrium and kinetic data respectively were all higher than 0.95. The maximum adsorption capacity and the time of rapid adsorption for MIOPM 4 were 4.146 mg g −1 and 100 min, respectively. In addition, the permeability separation factor of MIOPMs for M4HB compared to a structurally related analog methyl 2-hydroxybenzoate (M2HB) could reach 3.122.
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MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Mingyi Tang,Sai Zhang,Xianxian Li,Xiaobo Pang,Haixia Qiu
A facile and efficient approach to synthesize Fe 3 O 4 @Cu nanocomposites using l -Lysine as a linker was developed. The morphology, composition and crystallinity of the Fe 3 O 4 @Cu nanocomposites were characterized by Fourier Transform infrared spectroscopy , transmission electron microscopy , energy-dispersive X-ray spectroscopy, and powder X-ray diffraction. In addition, the magnetic properties were determined with vibrating sample magnetometer . The surface of the Fe 3 O 4 contained many small Cu nanoparticles with sizes of about 3 nm. It was found that the Fe 3 O 4 @Cu nanocomposites could catalyze the degradation of organic dyes. The catalytic activities of the Fe 3 O 4 @Cu nanocomposites for the reduction of nitrophenol were also studied. The Fe 3 O 4 @Cu nanocomposites are more efficient catalysts compared with Cu nanoparticles and can easily be recovered from the reaction mixture with magnet. The cost effective and recyclable Fe 3 O 4 @Cu nanocomposites provide an exciting new material for environmental protection applications.
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APPLIED ENERGY
·
2014
·
IF 5.261
Zhen Wang,Yiping Wang,Marta Vivar,Manuel Fuentes,Li Zhu,Lianwei Qin
The SOLWAT system is a combined system for solar water purification and renewable electricity generation. Its photovoltaic and photocatalytic performance, along with the photovoltaic (PV) electricity production was studied under the degradation of three different pollutants: Methylene Blue, Acid Red 26 and 4-Chlorophenol in present paper. The spectrum loss of the system was analyzed theoretically. Spectral transmittance experiments with different medium were conducted and compared with the results of outdoor experiments. The photovoltaic performance of the SOLWAT system was studied comparatively by measuring the P m and I sc under actual climatic conditions with a reference PV system. To investigate the photocatalytic performance of the SOLWAT system, the degradation of sample pollutants were detected by analyzing the UV absorption and the TOC. In the presence of the additional wastewater layer, PV cells in the SOLWAT system could work under lower temperature. Depending on the spectral absorption of pollutants, if it is within the spectral response of the PV cell, the electricity output is affected by the pollutant degradation (Methylene Blue, Acid Red 26). When the spectral absorption of pollutant is out of the spectral response of the cell, the PV output is not affected by the contaminant degradation (4-Chlorophenol). The output power of SOLWAT system, though decreased due to the light absorption, was sufficient to drive the whole system. The degradation of sample pollutants was detected by analyzing the UV absorption and the TOC to investigate the photocatalytic performance of the SOLWAT system. For the wastewater with different initial concentrations, the decolorization rate ran up above 99% and the mineralization rate was above 80%.
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