ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 11
·10685-10694
·
IF 2.741
Yu Ying,Wang Wei,Shi Jing,Zhu Siyi,Yan Yachen
The presence of antibiotics in the environment has attracted considerable attention due to their toxicity. In this study, agricultural waste corn bracts (CBs) modified by zirconium cations were utilized to remove levofloxacin (LEV) from wastewater. Zr-modified CBs exhibited a strong adsorption capacity (Q max = 73 mg/g), and their desorption rate could reach 89% by simply adjusting the pH to 11. FTIR and XPS analyses indicated that the mechanism of LEV adsorption included the complexation between the ketone/carboxyl groups of LEV and the Zr atoms and the π-π electron-donor-acceptor interaction. Zr-modified CBs are economic, effective and nontoxic adsorbents. This material not only removes antibiotics from wastewater but also enables recycling and reuse of agricultural waste.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Chemistry of Heterocyclic Compounds
·
2017
·Vol. 53
·期 1
·42-45
·
IF 0.865
Yu Xueying,Wang Kangnan,Cao Duxia,Wu Qianqian,Guan Ruifang,Xu Yongxiao,Sun Yatong,Liu Zhiqiang
A benzothiazolium salt containing carbazole group has been synthesized in a good yield via simple condensation reaction. Its photophysical properties and affinity for cyanide anion (tetrabutylammonium cyanide) have been investigated. The compound exhibited quick and well visible UV/Vis absorption and fluorescence responses to cyanide anion in MeCN, as the yellow color faded and the orange fluorescence disappeared. The in situ analysis by 1H NMR indicated that the cyanide anion was added to the C=N bond in the benzothiazolyl group.
研究领域:
分析化学
·
光化学
·
有机化学
✓ 已验证
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2022
·Vol. 61
·期 3
·221-229
·
IF 0.913
Liang Dong,Xiong Sang,Zhang Xiaojuan,Lin Qing
Tungsten oxide is widely used in the photolysis of water for hydrogen production, photocatalysis, photoelectric conversion, and electrochromism. Eu 3+ doped tungsten trioxide nanoparticles were prepared by hydrothermal method with the addition of sodium tungstate (NaWO 4 · 2H 2 O). Two different samples were obtained at the temperature set at 160 and 180°C. The third sample obtained from ammonium paratungstate ((NH 4 ) 10 H 2 (W 2 O 7 ) 6 ) was used at the temperature of 160°C. The samples’ morphology, structure, and optical performance were then observed and analyzed. The results show that a rod-like structure of WO 3 : Eu 3+ nanoparticle with a monoclinic crystal system can be successfully generated using sodium tungstate. A spherical structure of WO 3 : Eu 3+ nanoparticle with a triclinic crystal system was prepared using ammonium paratungstate. The finished sample with ammonium paratungstate at a reaction temperature of 160°C has the smallest grain average size of 45.98 nm and Eu 3+ ions successfully doped. Under the excitation of different wavelengths, the three samples demonstrate pronounced emission peaks at around 615 nm, corresponding to the 5D 0 → 7F 2 electronic transition of Eu 3+ . Using ammonium paratungstate as the tungsten source, the prepared WO 3 : Eu 3+ nanoparticle at 160°C has the highest luminous intensity. The luminescence intensity of the prepared WO 3 : Eu 3+ nanoparticle from ammonium paratungstate as a tungsten source is higher than the other two samples obtained from sodium tungstate as a tungsten source at two temperatures. However, the three samples with excitation wavelength λ = 254 nm were monitored at the wavelength of 615 nm. All three samples exhibited the most substantial excitation peaks at about 508 nm, which belonged to the electron transition in 4f of Eu 3+ .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2020
·Vol. 28
·期 5
·494-500
·
IF 2.047
Guo Xichao,Xiong Xuhai,Ren Rong,Chen Ping
In Part I of the paper, we have focused on the synthesis, characterization and solubility of three chain-extended bismaleimides containing aryl-ether-imide and phthalide cardo skeleton with different molecular weight (MPEIBMI-2.0, MPEIBMI-1.5 and MPEIBMI-1.25) and the thermal stability and thermal mechanical properties of their cured resins. In Part II of the paper, their high-temperature static viscoelasticity, shape memory (SM) performance and self-repairing behavior for micro-damages were investigated by dynamic mechanical analyzer and optical microscope. The creep test results exhibit the MPEIBMI-2.0 cured film has the strongest creep resistance at the same testing temperature due to the highest stiffness of its network structure, and the maximum allowable load of MPEIBMI-1.25 film at 200 °C reaches 15 MPa for 60 min creep experiment. The rate of stress relaxation for MPEIBMI-1.25 film is slower in spite of having relatively lower stress level. The MPEIBMI-1.25 film has the largest ultimate elongation at high temperature and this deformability confers it excellent shape memory (SM) ability. The shape fixity ratio reaches above 98% and the recovery rate is increased to above 96% from 94.5% after one SM cycle. The micro-damages on the surface of cured films could be repaired when heated to the temperature above their glass transition temperature, and the repairing temperature is increased with their crosslinking density to obtain perfect repairing efficiency.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2020
·Vol. 106
·期 1
·126-133
·
IF 1.657
Zhang Liyang,Xiao Jian,Ji Junfeng,Liu Yuanyuan
Adsorption of arsenate, a common soil contaminant, on natural occurring iron oxides controls arsenate adsorption on soils, especially on iron rich soils. However, soils contain multiple iron minerals and their contributions for arsenate adsorption on the bulk soil are unclear. In this study, Wenzel’s sequential extraction procedure (SEP) was used to characterize different fractions of iron oxides in the paddy soils from Guangxi, China. Soils treated with different extractants in the SEP (i.e. soils contained different iron fractions) were used to study arsenate adsorption on different iron fractions in the soil. Langmuir model was used to assess arsenate adsorption capacities of those iron fractions. The results showed that though amorphous iron made up only 16% of the total iron in the soil, it accounted for 82% of the soil adsorption capacity. Besides, arsenate adsorption capacity on the soils could be estimated by linear addition of arsenate adsorption capacity on the amorphous iron oxides fraction and that on the other iron oxides fraction. This study implied a possibility to use iron fractions characterized by Wenzel’s SEP to evaluate arsenate adsorption on the bulk soils.
研究领域:
土壤学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
MEDICINAL CHEMISTRY RESEARCH
·
2023
·Vol. 32
·期 5
·899-909
·
IF 2.6
Ye Zhen,Zhao Tong-Shi-Yao,Li Shan-Bin,Zhou Xian-Li,Luo Qin,Qin Jiang-Ke,Liang Cheng-Qin,Wang Ping,Ge Guang-Bo
Previous in vivo and in vitro studies revealed that esculetin (Fig. 1 ) has anti-hepatitis B virus (anti-HBV) activity as well as a protective effect on liver damage caused by duck hepatitis B virus. We designed and synthesized a series of esculetin derivatives, introduced side chains containing various amino groups into site 7 of the parent structure, and synthesized C-4 and C-8 substituted derivatives with the goal of investigating their anti-HBV activities. In vitro anti-HBV activity was performed against HepG2.2.15 cells by using Enzyme-Linked Immunosorbent Assay(ELISA) kit and cytotoxicity was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay with lamivudine as the positive control. The results demonstrated that several compounds showed moderate anti-HBV activity, while the introduction of morpholine groups could significantly inhibit the expression of hepatitis B e antigen (HBeAg) and the introduction of the 2-methylimidazole group could significantly inhibit the expression of Hepatitis B surface antigen (HBsAg). Among all tested compounds, compound 4a demonstrated the best anti-HBeAg activity (IC 50 = 15.8 ± 4.2 μM), while compound 6d demonstrated the best anti-HBsAg activity (IC 50 = 21.4 ± 2.8 μM). Compounds 6b and 6c showed moderate anti-HBV activity and HBsAg inhibition. Compounds 4b showed moderate anti-HBV activity and an inhibitory effect on HBeAg. In addition, compounds 4a , 4c , 4d , 6b , 6c and 6d showed improved metabolic stability. This study provides useful guidance for the discovery of anti-HBV drugs, which merits further investigation. Graphical Abstract
研究领域:
药理学
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 3
·761-771
·
IF 2.316
Zeng Dongrong,Huang Jilin,Lin Zhipeng,Yu Xiang,Zhan Yunfeng,Xie Fangyan,Zhang Weihong,Chen Jian,Meng Hui
A non-noble metal Fe/N/C catalyst is prepared by pyrolyzing the ball-milled mixture of graphitized carbon ribbon, iron precursor, and nitrogen precursor in ammonia. The Fe/N/C catalyst shows high ORR activity in alkaline solution, together with much improved stability compared with Pt/C catalyst. In the catalyst, FeN particles are covered by graphitic carbon layers. The activity is proposed to originate from the FeN and Fe/N/C sites. The stability is explained by the protecting effect of the carbon layers surrounding the FeN particles. The ORR mechanism on the Fe/N/C catalyst is proposed to be similar with Pt/C catalyst based on the Tafel plots. The Fe/N/C catalyst shows great potential in ORR in alkaline solution, while the performance in acid still needs improvement.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 3
·1-10
·
IF 0
He Shiwei,Xu Ruidong,Guo Yuqing,Zhao Zhuo,Yu Bohao,Xiao Saijun,Lv Huihong
In this study, β-PbO 2 –Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2 –Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
ARCHIVUM IMMUNOLOGIAE ET THERAPIAE EXPERIMENTALIS
·
2023
·Vol. 71
·期 1
·1-10
·
IF 3.2
Qiao Junying,Guo Shanshan,Huang Xianjie,Zhang Luodan,Li Fan,Fan Yazhen
This study aimed to observe the expression of angiopoietin-2 (Ang-2) in the lung tissue of juvenile SD rats with lipopolysaccharide (LPS)-induced acute lung injury (ALI) and to clarify the role of ulinastatin (UTI). Ninety 18–21-day-old juvenile SD male rats were randomly divided into five groups ( n = 18). ALI rat model was established by intraperitoneal injection of LPS (LPS 10 mg/kg), while the control group was given the same dose of normal saline. The UTI intervention group was given the injection of UTI (5000 U/mL) immediately after the injection of LPS, which was divided into UTI low-dose group (LPS + 5 ml/kg UTI), UTI medium-dose group (LPS + 10 ml/kg UTI), and UTI high-dose group (LPS + 20 ml/kg UTI).The respiratory status of each group of rats was observed, and six rats were randomly selected to be killed in each group at 6, 12, and 24 h, and the lung tissues were dissected and retained. The pathological changes of the lung tissues were observed by hematoxylin–eosin (HE) staining, the expression levels and locations of Ang-2 and vascular endothelial growth factor (VEGF) in lung tissue were observed by immunohistochemical staining, and the expressions of genes and proteins of Ang-2 and VEGF were detected by quantitative reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis. Three hours after intraperitoneal injection, rats in the model group developed shortness of breath and the developed respiratory distress progressed over time. The lung pathological changes in the model group were obvious compared with those in the control group, and gradually worsened with time, and the pathological changes of lung in the rats in the UTI intervention group were reduced compared with those in the model group. At different time points, the expressions of Ang-2 and VEGF in the lung tissue of rats in the model group were higher than those in the control group, and were lower in the UTI intervention group than those in the model group. The expressions of Ang-2 and VEGF protein were lower in the low-dose group of UTI group than those in the high-dose group of UTI group at different time points ( P < 0.05), and the expressions of Ang-2 and VEGF protein in the low-dose group of UTI were significantly lower than those in the medium-dose group at 12 h and 24 h ( P < 0.05). The expression of Ang-2 was increased in the lung tissue of juvenile SD rats with LPS-induced ALI, and was associated with the degree of lung injury. UTI might attenuate LPS-induced ALI by inhibiting the expression of Ang-2 in lung tissue, and the low dose was more obvious than the medium and high dose.
研究领域:
药理学
·
呼吸病学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 19
·期 5
·915-923
·
IF 1.853
Hao Junsheng,Wang Pan,Zhang Yongbin,Zhang Yue
A series of novel pyridinium cationic gemini amphiphiles, 3,3′-(carbonyldiimino)bis (1- n -alkylpyridinium) dibromides, having octyl, decyl, dodecyl, tetradecyl alkyl chains were synthesized. The surface properties and aggregation behavior in aqueous solution were evaluated by surface tension, dynamic light scattering (DLS), and transmission electron microscopy (TEM) measurement. The adsorption at the air/solution interface of all the compounds were quantitative described using the Frumkin model, and the effect of alkyl chain length on surface activity and aggregate behavior was analyzed. It was found that all the gemini amphiphiles possess surface activity and low critical micellization concentration (CMC) values. The values of log CMC depended linearly on the carbon number of the alkyl chains, but the surface tension at the CMC (γ cmc ) showed a minimum for the compound with dodecyl chains. Combinations of DLS and TEM observations showed the existence of vesicles with a broad size distribution in aqueous solution. Meanwhile, vesicles formed below the CMC could be a possible reason for the observed deviation of surface tension curves from the Frumkin model.
研究领域:
化学
·
材料科学
·
界面科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·2050-2060
·
IF 4.5
Ren Jiahui,He Yongping,Sun Haidong,Zhang Rongzi,Li Juan,Ma Wenbiao,Liu Zhong,Li Jun,Du Xiao,Hao Xiaogang
Reducing the dissolution of Mn from LiMn 2 O 4 (LMO) and enhancing the stability of film electrodes are critical and challenging for Li + ions selective extraction via electrochemically switched ion exchange technology. In this work, we prepared a nitrogen-doped carbon cladding LMO (C-N@LMO) by polymerization of polypyrrole and high-temperature annealing in the N 2 gas to achieve the above purpose. The modified C-N@LMO film electrode exhibited lower Mn dissolution and better cyclic stability than the LMO film electrode. The dissolution ratio of Mn from the C-N@LMO film electrode decreased by 42% compared to the LMO film electrode after 10 cycles. The cladding layer not only acted as a protective layer but also functioned as a conductive shell, accelerating the migration rate of Li + ions. The intercalation equilibrium time of the C-N@LMO film electrode reached within an hour during the extraction of Li + ions, which was 33% less compared to the pure LMO film electrode. Meanwhile, the C-N@LMO film electrode retained evident selectivity toward Li + ions, and the separation factor was 118.38 for Li + toward Mg 2+ in simulated brine. Therefore, the C-N@LMO film electrode would be a promising candidate for the recovery of Li + ions from salt lakes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 312
·期 3
·599-607
·
IF 1.282
Liu Guiqing,Wang Wei,Lin Jianguo,Li Ke,Lv Gaochao,Zhao Xueyu,Wang Shanshan,Luo Shineng,Qiu Ling
16α- 18 F-fluoroestradiol ( 18 F-FES) has been developed as a promising positron emission tomography (PET) imaging agent for targeting estrogen receptor positive (ER + ) breast cancer in the clinical trial. However, the radiosynthesis of 18 F-FES often requires two steps and tough experimental conditions. Therefore, a new estradiol derivative ( 18 F-AmBF 3 -ES) was prepared by an efficient one-step 18 F-radiolabeling method. The tracer was obtained in high yield (~65%) and excellent radiochemical purity (>98%) within 30 min. The uptake rate of 18 F-AmBF 3 -ES in ER + cells was about 3.5% at 30 min. The results suggested that the tracer may be a potential PET imaging agent for ER + breast cancer.
研究领域:
医学影像学
·
肿瘤学
·
核化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）