POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 11
·2838-2847
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IF 2.137
Shuchen Shi,Dongyi Li,Chunxiao Chai,Yufeng Wu,Ying Xu
A novel modified polyaspartic acid polymer, polyaspartic acid/4-(2-aminoethyl) morpholine graft copolymer (PASP/AEM), was prepared through a ring-opening reaction of polysuccinimide and 4-(2-aminoethyl) morpholine and characterized by 1 H NMR. The scale inhibition performance of this copolymer and its ability to disperse Fe 2 O 3 were investigated in static tests. Scanning electron microscopy and X-ray powder diffraction were used to analyze the effects of PASP/AEM on scale formation. The performance and mechanism of corrosion inhibition by the synthesized copolymer were studied via weight loss measurements and electrochemical measurements. The results showed that PASP/AEM possessed outstanding scale and corrosion inhibition efficiencies and had potential for use as a green scale and pickling inhibitor.
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INTERNATIONAL IMMUNOPHARMACOLOGY
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2019
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IF 3.361
Sen Yang,Ge Kuang,Rong Jiang,Shengwang Wu,Tao Zeng,Yuanyuan Wang,Fangzhi Xu,Lingyi Xiong,Xia Gong,Jingyuan Wan
Acetaminophen (APAP) is a widely used over-the-counter drug for antipyretic and analgesic , but an overdose will induce acute liver injury. APAP hepatotoxicity has been the most common cause of acute liver failure in western countries with high morbidity and mortality. Geniposide (GP), an iridoid glycoside extracted from the fruit of Gardenia jasminoides , has been reported to exert a profound anti-inflammatory activity on acute and chronic diseases. However, it is never demonstrated whether GP can protect hepatocytes from APAP hepatotoxicity. In this study, we investigated the protective effect and underlying mechanism of GP against AILI. The results showed that GP pretreatment reduced the levels of ALT and AST in a dose-dependent manner and alleviated hepatocyte necrosis and apoptosis in mice exposed at APAP. Moreover, it suppressed the expression of CYP 2E1 and attenuated the exhaustion of GSH and accumulation of MDA in the liver. Furthermore, GP remarkably inhibited inflammatory cells infiltration and mitigated the release of IL-1β and TNF-α, and inhibited Toll-like receptor 4 (TLR4) expression and nuclear factor kappa (NF-κB) activation. These data suggested that GP could effectively protect hepatocytes from APAP hepatotoxicity through the down-regulation of CYP 2E1 expression and the inhibition of TLR4/NF-κB signaling pathway .
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Minghua Wang,Yongkang Liu,Longyu Yang,Kuan Tian,Linghao He,Zhihong Zhang,Qiaojuan Jia,Yingpan Song,Shaoming Fang
A series of composites comprising FeO x and TiO 2 nanoparticles uniformly distributed throughout a mesoporous carbon matrix (hereafter denoted as FeO x /TiO 2 @mC nanocomposites) was synthesized by the direct pyrolysis of a bimetallic Fe/Ti-based metal–organic framework at high temperatures (500, 700, and 900 °C). It shows that the as-prepared FeO x /TiO 2 @mC nanocomposites exhibit large specific surface areas and hierarchically micro/mesoporous hybrid structures, further leading to high electron transfer rate. Combining the highly electrocatalytic activity of TiO 2 and FeO x and the good charge-transfer capability of mesoporous carbon, the caused synergism enables the construction of novel and platforms for sensitively detecting 4-nitrophenol (4-NP). After the optimization of sensitive layers and detection conditions, FeO x /TiO 2 @mC 700 (calcined at 700 °C) is found to exhibit high detection ability toward 4-NP owing to its excellent electrochemical performance and electrocatalytic activity. The FeO x /TiO 2 @mC 700 -based electrochemical sensor shows a low limit of detection of 0.183 μM (S/N = 3) within the linear range of 5–310 μM as determined using amperometry toward 4-NP. The proposed method also displays good anti-interference ability, stability, and applicability toward 4-NP determination in environmental water samples. All these results suggest that the components of the MOF-derived binary metal oxide/mesoporous carbon electrocatalyst can function as a novel electrocatalyst for more endeavors into the development of a promising sensing platform for hazardous compounds in the environment.
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APPLIED ENERGY
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2014
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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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MATERIALS CHEMISTRY AND PHYSICS
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2014
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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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ANALYST
·
2015
·Vol. 140
·期 17
·5944-5952
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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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ACS Applied Materials & Interfaces
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2014
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IF 5.9
Wangen Zhao,Gang Wang,Qingwen Tian,Yanchun Yang,Lijian Huang,Daocheng Pan
Cu2ZnSn(S,Se)4 semiconductor is a promising absorber layer material in thin film solar cells due to its own virtues. In this work, high quality Cu2ZnSn(S,Se)4 thin films have been successfully fabricated by an ethanol-based sol–gel approach. Different from those conventional sol–gel approaches, SnS2 was used as the tin source to replace the most commonly used SnCl2 in order to avoid the possible chlorine contamination. In addition, sodium was found to improve the short-circuit current and fill factor rather than the open-circuit voltage due to the decrease of the thickness of small-grained layer. The selenized Cu2ZnSn(S,Se)4 thin films showed large densely packed grains and smooth surface morphology, and a power conversion efficiency of 6.52% has been realized for Cu2ZnSn(S,Se)4 thin film solar cell without antireflective coating.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2013
·
IF 5.825
Xin Xiao,Chunlan Xing,Guangping He,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A facile solvothermal route is successfully developed to synthesize Bi 4 O 5 I 2 , a novel I-poor bismuth oxyiodide, with hierarchical nanoflake structure. The composition, structure, morphology, formation mechanism, photoabsorption, energy band, and photocatalytic properties of this material are systematically investigated. The results reveal that highly pure Bi 4 O 5 I 2 can be easily obtained by reacting Bi 3+ , I − , and OH − at pH values of 6 to 10 under solvothermal conditions, and the formation of such hierarchical structure can be explained by a dissolution–recrystallization mechanism. The as-synthesized Bi 4 O 5 I 2 nanoflakes show a favorable energy band structure (bandgap energy 2.17 eV, conduction band edge potential is more negative than the reduction potential of superoxide radicals), a high specific surface area (38.6 m 2 g −1 ), and a hierarchical micro/nano structures. Thus, they exhibit superior photocatalytic and mineralization efficiency for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) under visible light irradiation, with a reaction rate is 6.8 and 57 times faster than that of BiOI microspheres and N-doped TiO 2 , respectively. The photogenerated reactive species and degradation intermediates are identified, and possible photocatalytic mechanism is proposed. What's more, the as-synthesized Bi 4 O 5 I 2 nanoflakes remain stable during the photocatalytic reaction and can be used repeatedly, revealing their promising applications in the treatment of organic wastewaters.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
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2015
·
IF 2.96
Junhui Pan,Langhong Wang,Guowen Zhang,Deming Gong
The characteristics of binding of 2-tert-butyl-4-methylphenol (TBMP), a synthetic phenolic antioxidant with hydroxypropyl-β-cyclodextrin (Hp-βCD) and calf thymus DNA (ctDNA) were investigated by multi-spectroscopic techniques and molecular simulation. The results indicated that TBMP preferred to form a 1:1 inclusion complex with Hp-βCD, with an inclusion constant of determined to be 7.15 × 10 3 L mol −1 . The intercalative mode of TBMP to ctDNA was supported by ctDNA melting temperature and relative viscosity studies, salt quenching effect, competitive binding with methylene blue and molecular modeling. The changes in Fourier transformed infrared (FT-IR) and circular dichroism (CD) spectra suggested that TBMP mainly bound to the G–C rich region with inducing a significant perturbation in B-like DNA structure. It was also found that Hp-βCD decreased the binding ability of TBMP with ctDNA, but did not affect the interactive mode between TBMP and ctDNA, and the formed inclusion complex of TBMP–Hp-βCD decomposed in the presence of ctDNA. This study may provide insights into the mechanism of binding of TBMP with ctDNA and the role of Hp-βCD in the TBMP–ctDNA interaction.
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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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HIGH PERFORMANCE POLYMERS
·
2014
·
IF 1.09
Jiangtao Liu,Guofei Chen,Xingzhong Fang
A series of isomeric poly(thioether ether imide)s (PTEIs) containing both thioether and ether linkages were prepared by aromatic nucleophilic substitution reaction of isomeric bis(chlorophthalimide)s (BCPIs) with bis(4-mercaptophenyl) ether (BMPE). The inherent viscosities of synthesized polymers were found in the range of 0.41–0.86 dL g−1 in N-methyl-2-pyrrolidone at 30°C. The glass transition temperature (Tg) of the isomeric PTEIs were 210–242°C and increased by increasing the content of 3-substituted phthalimide unit in the polymer backbone. The 5% weight loss temperature values reached up to 525–539°C under nitrogen and 523–534°C in air atmospheres, respectively, which indicated this kind of polyimide possessed excellent thermal stability. Flexible films could be cast from the polymer solution. The PTEI films exhibited moderate mechanical properties with tensile strengths of 106–127 MPa, elongations at break of 8.6–11.5%, and tensile moduli of 2.2–2.8 GPa, respectively. Dynamic mechanical thermal analysis results illustrated that the storage moduli (E′) of PTEI (a–e) almost completely maintained at about 2.3 GPa before reaching the corresponding Tg. It is noted that the minimum melt viscosity of isomeric PTEIs (a′–e′) decreased by increasing the content of unsymmetrical 3,4′-substituted phthalimide unit in the polymer main chain.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2014
·
IF 2.129
Ruiyong Wang,Xiaogai Wang,Zhigang Li,Yuanzhe Xie,Lingling Yang,Jie Shi,Junbiao Chang
The binding of 4′-azido-2′-deoxyfluoroarabinocytidine (FNC) or analogs (cytidine and 5′-cytidylate monophosphate) to bovine serum albumin (BSA) was investigated by fluorescence, UV–vis absorption spectroscopy and molecular modeling. The three compounds quenched the intrinsic fluorescence of BSA and the results revealed the presence of static quenching mechanism. The positive Δ H and positive Δ S for the systems suggested that the hydrophobic forces stabilized the interaction between the compounds and protein. Results also showed that FNC was the weakest quencher.
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