JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2018
·Vol. 33
·期 3
·559-565
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IF 0.524
Guo Huiling,Sun Honghao,Su Zhengding,Hu Shuchao,Wang Xiaotao
A facile approach has been developed to synthesize Fe 3 O 4 @PAM (polyacrylamide) nanoparticles (NPs) with carboxyl groups on the surfaces by copolymerization with acrylamide and acrylic acid in Fe 3 O 4 NPs aqueous suspension. Nitrilotriacetic acid (NTA) was conjugated to the magnetic NPs via well-known carboniimide chemistry using EDC and NHS. The Ni 2+ ions loaded on the surface of NPs provide abundant docking sites for immobilization of His-tagged green fluorescent proteins (His-tagged GFP). The high magnetic property of Fe 3 O 4 @PAM@NTA-Ni 2+ allows an easy separation of the NPs from solution under an external magnetic field, with high His-tagged protein binding capacity (42 μg protein/mg of NPs). The NPs can be recycled for at least four times without significant loss of binding capacity to proteins. These materials show great potential to separate His-tagged protein with low-cost purification at industrial scale.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 6
·1-16
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IF 2.127
Zhang Sufeng,Zhao Dongyan,Hou Chen,Liang Chen,Li Hao
A facile and efficient one-pot method for the synthesis of well-dispersed hollow CuFe 2 O 4 nanoparticles (H-CuFe 2 O 4 NPs) in the presence of cellulose nanocrystals (CNC) as the support was described. Based on the one-pot solvothermal condition control, magnetic H-CuFe 2 O 4 NPs were in-situ grown on the CNC surface uniformly. TEM images indicated good dispersity of H-CuFe 2 O 4 NPs with uniform size of 300 nm. The catalytic activity of H-CuFe 2 O 4 /CNC was tested in the catalytic reduction of 4-nitrophenol (4-NP) in aqueous solution. Compared with most CNC-based ferrite catalysts, H-CuFe 2 O 4 /CNC catalyst exhibited an excellent catalytic activity toward the reduction of 4-NP. The catalytic performance of H-CuFe 2 O 4 /CNC catalyst was remarkably enhanced with the rate constant of 3.24 s −1 g −1 , which was higher than H-CuFe 2 O 4 NPs (0.50 s −1 g −1 ). The high catalytic activity was attributed to the introduction of CNC and the special hollow mesostructure of H-CuFe 2 O 4 NPs. In addition, the H-CuFe 2 O 4 /CNC catalyst promised good conversion efficiency without significant decrease even after 10 cycles, confirming relatively high stability. Because of its environmental sustainability and magnetic separability, H-CuFe 2 O 4 /CNC catalyst was shown to indicate that the ferrite nanoparticles supported on CNC were acted as a promising catalyst and exhibited potential applications in numerous ferrite based catalytic reactions.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2018
·Vol. 33
·期 3
·758-766
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IF 0.524
Zhu Tianli,Wang Youfa
An in-situ consolidation method was developed and optimized to successfully fabricate alumina ceramics using pre-gelling starch. Our results showed that the obtained ceramics have more homogeneous microstructure, higher density, higher flexural strength, and favorable biocompatibility compared to the regular one. During the process, cornstarch granules swelled and deformed but no fracture was observed. After the cornstarch granules bursted, alumina particles were suspended uniformly in the three-dimensional network structure to generate a much smoother surface. Below 0.5 wt% higher cornstarch content increased the flexural strength of prepared ceramics, while above 0.5 wt% the mechanical properties were compromised. Therefore the cornstarch content of 0.5% was the optimal concentration to achieve the highest mechanical strength of the prepared ceramics, with a measured flexural strength of 341 MPa, and a relative density of 96.01%.
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高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2018
·Vol. 101
·期 3
·338-343
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IF 1.48
Duan Kaili,Cui Meng,Wu Yanni,Huang Xueyong,Xue Ahui,Deng Xunan,Luo Liping
In the present study, Chlorella vulgaris were cultured in the presence of the common plasticizer dibutyl phthalate (DBP) with different concentrations for 10 days. The cell density, DBP concentrations, neutral lipid concentrations, and lipid morphology in C. vulgaris were studied using optical microscopy, gas chromatography (GC), fluorescence spectrophotometry, and laser scanning confocal microscopy (LSCM). We observed that the neutral lipid contents and cell density of C. vulgaris were negatively influenced by DBP of high concentrations (50 and 100 mg/L), but significantly stimulated by DBP of low concentrations (5, 10, and 20 mg/L). Lipid bodies were destroyed into pieces by DBP of high concentrations (50 and 100 mg/L), but were slightly suppressed by DBP at low concentrations (5, 10, and 20 mg/L). Chlorella vulgaris treated with DBP (50 mg/L) for 2 days showed the highest removal efficiency (31.69%). The results suggested that C. vulgaris could be used in practice to remove DBP and has the potential of being oleaginous microalgae in DBP contaminated water.
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PubMed
高影响因子
Allergy Asthma and Clinical Immunology
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2018
·Vol. 14
·期 1
·1-9
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IF 2.051
Li Jian,Wang Bin,Luo Yingying,Bian Yajie,Wang Ruipei
Background Allergic rhinitis (AR), characterized by sneezing, nasal itching and rhinorrhea, affects a large number of population. This study aimed to explore the effects of artemisinin alone or combined with neurectomy of pterygoid canal in ovalbumin-induced AR mouse model and illustrate the underlying mechanisms. Methods Allergic symptoms were evaluated to verify inhibitory effect of artemisinin alone or combined with neurectomy of pterygoid canal on AR. Serum levels of histamine, immunoglobulin E (IgE) and inflammatory factors TNF, INF-γ, IL-1β IL-10, IL-4 and IL-5 were measured by ELISA. The mRNA levels of TNF, INF-γ, IL-1β and IL-10 in local lymph nodes were measured by RT-qPCR. The total and phosphorylated levels of ERK and JNK were assessed by Western blot. CD4 + CD25 + Foxp3 + T (Treg) cells were analyzed by flow cytometry. Results Artemisinin significantly relieved the behavior symptoms of AR mice. The administration of artemisinin strikingly suppressed the expression of histamine, IgE and inflammatory factors. An increased Treg cell proportion and inhibited ERK phosphorylation were observed in artemisinin-treated groups as compared to those in the AR group. Moreover, artemisinin plus neurectomy of pterygoid almost abolished the behavioral score increase in AR mice. Conclusions These results indicated that artemisinin exhibited anti-allergic effect by inhibiting ERK activation and increasing Treg cell proportion, which subsequently decreased the expressions of allergic mediators. In addition, artemisinin combined with neurectomy of pterygoid showed better efficacy than artemisinin alone.
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PubMed
高影响因子
Science China-Chemistry
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2018
·Vol. 61
·期 10
·1301-1306
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IF 4.448
Wang Sheng,Wang Fang,Li Chengpeng,Li Teng,Cao Derong,Ma Xiang
A novel multifunctional molecule BTE-CNPH was designed and synthesized by connecting 2-(3′,5′-bis(trifluoromethyl)-biphenyl-4-yl)-2-cyanovinyl group to both side of the bisthienylethene (BTE), which exhibited excellent aggregation-induced emission (AIE) and bistable photochromism. High-contrast (>60) reversible fluorescence switching was achieved in the 1D nanowires, solid of BTE-CNPH and also in a polymethyl methacrylate (PMMA) film loaded with 1% BTE-CNPH under the alternative irradiation by 365 nm and visible light. Interestingly, the nanowire-like assembly morphology of BTE-CNPH in aqueous tetrahydrofuran (THF) solution of specific concentration was observed to translate into amorphous pieces gradually upon prolonged irradiation by the 365 nm, accompanying with photo-tunable AIE emission.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 23
·22998-23008
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IF 2.8
Zhao Junfeng,Wang Qun,Fu Yongsheng,Peng Bo,Zhou Gaofeng
In this study, the effect of Fe 3+ , Fe 2+ , and Mn 2+ dose, solution pH, reaction temperature, background water matrix (i.e., inorganic anions, cations, and natural organic matters (NOM)), and the kinetics and mechanism for the reaction system of Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ were investigated systematically. Traces of Fe 3+ , Fe 2+ , and Mn 2+ promoted the DCF removal by Fe(VI) significantly. The pseudo-first-order rate constant ( k obs ) of DCF increased with decreasing pH (9–6) and increasing temperature (10–30 °C) due to the gradually reduced stability and enhanced reactivity of Fe(VI). Cu 2+ and Zn 2+ ions evidently improved the DCF removal, while CO 3 2− restrained it. Besides, SO 4 2− , Cl − , NO 3 − , Mg 2+ , and Ca 2+ almost had no influence on the degradation of DCF by Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ within the tested concentration. The addition of 5 or 20 mg L −1 NOM decreased the removal efficiency of DCF. Moreover, Fe 2 O 3 and Fe(OH) 3 , the by-products of Fe(VI), slightly inhibited the DCF removal, while α-FeOOH, another by-product of Fe(VI), showed no influence at pH 7. In addition, MnO 2 and MnO 4 − , the by-products of Mn 2+ , enhanced the DCF degradation due to catalysis and superposition of oxidation capacity, respectively. This study indicates that Fe 3+ and Fe 2+ promoted the DCF removal mainly via the self-catalysis for Fe(VI), and meanwhile, the catalysis of Mn 2+ and the effect of its by-products (i.e., MnO 2 and MnO 4 − ) contributed synchronously for DCF degradation.
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PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
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2018
·Vol. 25
·期 2
·143-151
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IF 0
Du Jianzeng,Li Yonghong,Miao Zhenyu
Novel Ni/ZnO – HZSM-5 adsorbents were synthesized by incipient wetness impregnation. The Ni/ZnO – HZSM-5 adsorbent can achieve deep desulfurization and olefin aromatization at the same time. Thiophene sulfur was removed from 495 to less than 10 ppm via reactive adsorption desulfurization (RADS). Olefins were also converted into aromatics. HZSM-5 did not only support adsorbents but also cooperated with active Ni sites to catalyze olefins into aromatic hydrocarbons. Aromatization of 1-pentene, 2-pentene, 2-methyl-2-butene, and 1-hexene on adsorbents was investigated. The adsorbents were characterized by the Brunauer–Emmett–Teller, X-ray diffraction, temperature-programmed reduction, and temperature-programmed desorption of ammonia and thermogravimetric analysis. The experimental results showed that strong acids on the adsorbent disappeared after HZSM-5 loaded active metal sites, and almost no coke was generated on adsorbents in RADS.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 1
·52-65
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IF 0
Li Wang,Zhang Qingjun,Zeng Aiwu
In this study, liquid-phase aerobic oxidation of toluene catalyzed by Mn–Mo oxide was conducted in a 1.0 L batch reactor. The macroscopic kinetics of toluene consumption and benzaldehyde generation at 413–443 K were obtained from a combination of experimental observation and hypothetical models. The results clearly showed that both the oxidation rate of toluene and generation rate of the aromatic product were proportional to the concentration of the substrate, the partial pressure of oxygen and the surface area of the catalyst. The energy barrier of toluene oxidation to benzyl alcohol was the highest (≈ 81 kJ mol −1 ), while that of benzyl alcohol oxidation to benzaldehyde was the lowest (≈ 57 kJ mol −1 ). Moreover, the activation energy of further oxidation of benzaldehyde in an acetic acid solvent was only slightly lower (≈ 1.9 kJ mol −1 ) than that of toluene oxidation. Significantly, the transformation of benzyl alcohol indeed contributed to the generation of benzaldehyde and this step conformed to a first-order parallel-consecutive model. Increased reaction temperature and residence time favored the transformation of benzyl alcohol to benzaldehyde. In addition, doping with molybdenum at Mn/Mo = 3/1 enhanced the catalytic performance of the heterogeneous catalyst and was attributed to the presence of a synergetic effect between different metal cations. Regarding the microscopic kinetics, the LH-OS-ND mechanism (Langmuir–Hinshelwood adsorption of reagents on the same type of active sites and non-dissociative adsorption of oxygen) was verified as responsible for the heterogeneous oxidation of toluene. Oxygen and benzaldehyde were weakly adsorbed (Δ H ads,Oxy ≈ − 15 kJ mol −1 , Δ H ads,Bald ≈ − 30 kJ mol −1 ), but showed strong mobility (Δ S ads,Oxy ≈ − 22 J mol −1 K −1 ), Δ S ads,Bald ≈ − 39 J mol −1 K −1 ). The fundamental intrinsic rates were deduced based on the LH-OS-ND mechanism and showed great consistency with the macroscopic results.
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CELLULOSE
·
2018
·Vol. 25
·期 6
·3471-3486
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IF 3.809
Li Qiaoping,Xu Bin,Zhuang Linghua,Xu Xiaoqing,Wang Guowei,Zhang Xinghua,Chen Jing,Tang Yang
Tetracarboxylic acid ester was synthesized with diethyl malonate and methyl acrylate, and an amino terminated hyperbranched polymer (HBP-NH 2 ) was prepared by reaction of a tetracarboxylic acid ester with diethylenetriamine (DETA). Hyperbranched polymer grafted chitosan (HBP-g-chitosan), a novel adsorbent material for Cr(VI) removal, was prepared from HBP-NH 2 and chitosan with epichlorohydrin as crosslinking agent. The adsorbent was characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectrophotometry, and X-ray diffraction. The influence of the initial concentration of Cr(VI), the dosage of adsorbent, pH value and the coexisting anions on the adsorption performance were studied. An isotherm of the adsorption process was generated and studied by Langmuir and Freundlich models. The results showed that the Freundlich model proved to be more suitable than the Langmuir model. The adsorption kinetics were determined by pseudo-first order and pseudo-second order kinetics. In doing so, it was found that the pseudo-second order kinetic model was more reliable than the pseudo-first order kinetic model.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2018
·Vol. 48
·期 10
·1121-1129
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IF 2.262
Zhu Chun-Rong,Long Jun-Fei,Tang Qian,Gong Cheng-Bin,Fu Xiang-Kai
Abstract This paper aims to develop a multi-colored electrochromic device based on mixed mono- and bi-substituted 4,4′-bipyridine derivatives containing an ester group. A series of these derivatives were synthesized, and their electrochemical and electrochromic properties were studied through cyclic voltammetry and ultraviolet–visible spectroscopy. The mono- and bi-substituted 4,4′-bipyridine derivatives containing an ester group displayed different onset bias and colored state. Mono-substituted 4,4′-bipyridine derivatives showed a magenta colored state at an onset bias of − 1.3 V; bi-substituted 4,4′-bipyridine derivatives showed violet colored states at an onset bias of − 0.8 V. A multi-colored electrochromic device was achieved by mixing mono- and bi-substituted 4,4′-bipyridine derivatives as the electrochromic layer. Graphical Abstract
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 5
·2885-2899
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IF 3.809
Song Wenlong,Yang Lu,Sun Zhuangzhi,Li Fei,Du Shanqi
For the growing demand of actuation performance, a highly powerful IL-cellulose based biocompatible ionic actuator was developed by the plasticization treatment method. In view of the effects of plasticizing treatment, the electromechanical properties and electrochemical properties of biocompatible ionic actuator were mainly studied in this paper. The characteristic peaks scanned by FT-IR and the phase analysis tested by XRD showed that no regenerated substances in the IL-cellulosed membrane were generated under different plasticizing parameters. With the increase of the plasticizing bath concentration and plasticizing time, the porosity of the IL-cellulose layer obviously decreased with a good flexibility, which improved the inner ions movement channels. CV results revealed that the specific capacitance under plasticization parameter of 30%—120 min was a significantly higher than that other IL-cellulose membranes. The results of EIS and GCD demonstrated that the ions diffusion rate increased under different plasticizer concentrations, and the charge and discharge speed was faster than the initial state. However, the ion diffusion rate remained unchanged under different plasticizing time, and the power density was declining along with a deteriorated permeability of IL-cellulose membrane. Additionally, through plasticization treatment, actuators under plasticization parameter of 30%—120 min exhibited largest single cycle peak displacement and peak to peak displacement, which were 219 and 393% over un-plasticized actuators.
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高影响因子
危险品化学品经营许可证（带存储）