BIOMETALS
·
2017
·Vol. 30
·期 3
·441-447
·
IF 2.183
Wang Qingming,Sun Huifang,Sha Weilin,Chen Juan,Gu Liuyue,Wang Dong,Tang Xinhui
A novel S2O3 2− luminescent sensor (Cu2+-p-CPIP) was developed and the presence of S2O3 2− caused an obvious fluorescence enhancement at 420 nm upon excitation at 330 nm, which could be distinguished with the naked eye under a UV lamp. Remarkably, the compound exhibited excellent selective and sensitive response to S2O3 2− over other common anions with a micromolar limit of detection (0.442 μM) in DMSO/H2O (v/v, 1:1) buffer. The absorbance intensity and the color of Cu2+-p -CPIP solution changed gradually with the increase of S2O3 2− concentration. The proposed method was applied to the determination of S2O3 2− in milk samples and the recoveries were 97.5–105%. The preparation of Cu2+-p -CPIP exhibited the quick, simple and facile advantages. The results showed that Cu2+-p -CPIP can be a good candidate for simple, rapid and sensitive colorimetric detection of S2O3 2− in aqueous solution.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 14
·8455-8464
·
IF 2.599
Qin Jingjing,Chen Lang,Zhao Chenghui,Lin Qixiang,Chen Shaowei
A novel porous aerogel of cellulose nanofiber (CNF)/cationic water-soluble poly[9,9-bis[3′-( N,N -dimethy)- N -ethylammonium)propyl)-2,7-fluorene- alt -1,4-phenylene]dibromide (CPFD) is prepared by freeze drying. CNF can effectively prevent aggregation of the conjugated polymer CPFD backbones. The CNF/CPFD hybrid aerogel is use for the detection of nitroaromatic (NAC) vapors. Due to the porous structure, the CNF/CPFD hybrid aerogel possesses a large number of accessible cavities, which could be sufficiently large to allow the diffusion of NAC vapors into the aerogel. As a result, the CNF/CPFD aerogel sensor shows high sensitivity toward NAC vapors. For 120-s exposure, the fluorescence quenching efficiency of the CNF/CPFD aerogel sensor toward 2,4-dinitrotoluene vapor is up to 85.9%, which is much larger than that of the spin-cast CPFD film. Furthermore, the sensing performance of the CNF/CPFD hybrid aerogel is not heavily dependent on the thickness, and the sensing process of the CNF/CPFD aerogel sensor is reversible.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5807-5821
·
IF 2.599
Xiao Jianliang,Lv Weiyang,Xie Zhou,Song Yihu,Zheng Qiang
It is a challenge to develop broad-spectrum, high-efficiency, easy-recyclable adsorbents for the removal of water contaminants. Herein, l -cysteine-reduced graphene oxide/poly(vinyl alcohol) (CRG/PVA) ultralight aerogels with good mechanical strength and reusability are prepared via a direct sol–aerogel transition strategy by freeze drying. At optimized composition, the aerogel shows high adsorption efficiency toward both cationic and anionic dyes, overcoming the defect of many traditional adsorbents that usually can only remove one type of organic dyes. The adsorption is proved to involve in π – π interaction between CRG and dyes, endowing the aerogel with universality in adsorbing a wide range of conjugated dyes. Moreover, a remarkable synergetic effect is observed for removal of two oppositely charged dyes from aqueous system, yielding exceptionally high total adsorption capacities surpassing all known adsorbents examined for removing binary dyes. Thus, the CRG/PVA aerogel demonstrates great potential for usage as reusable, high-efficiency, and broad-spectrum adsorbent in water treatment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 22
·23081-23091
·
IF 2.76
Mao Qianhui,Ji Feng,Wang Wei,Wang Qiquan,Hu Zhenhu,Yuan Shoujun
The reactivity and fate of parabens during chlorination were investigated in this work. Chlorination kinetics of methylparaben (MeP), ethylparaben (EtP), propylparaben (PrP), and butylparaben (BuP) were studied in the pH range of 4.0 to 11.0 at 25 ± 1 °C. Apparent rate constants ( k
app ) of 9.65 × 10 −3 M -0.614 ·s −1 , 1.77 × 10 −2 M -1.019 ·s −1 , 2.98 × 10 −2 M -0.851 ·s −1 , and 1.76 × 10 −2 M -0.860 ·s −1 for MeP, EtP, PrP, and BuP, respectively, were obtained at pH 7.0. The rate constants depended on the solution pH, temperature, and NH 4
+ concentration. The maximum k
app was obtained at pH 8.0, and the minimum value was obtained at pH 11.0. The reaction rate constants increased with increasing temperature. When NH 4
+ was added to the solution, the reaction of parabens was inhibited due to the rapid formation of chloramines. Two main transformation products, 3-chloro-parabens and 3,5-dichloro-parabens, were identified by GC-MS and LCMS-IT-TOF, and a reaction pathway was proposed. Dichlorinated parabens accumulated in solution, which is a threat to human health and the aqueous environment.
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高影响因子
Journal of Coatings Technology and Research
·
2016
·Vol. 13
·期 6
·1115-1121
·
IF 1.342
Liang Tao,Li Hongqiang,Lai Xuejun,Su Xiaojing,Zhang Lin,Zeng Xingrong
The super-hydrophilic polymer coating film can easily be be peeled off from a substrate with the existence of water, which is a fatal drawback in practical applications. Herein, a facile approach is proposed to prepare UV-curable super-hydrophilic polyacrylate coating film that is chemically grafted on the surface of γ -methacryloxypropyltrimethoxysilane-modified glass substrate. Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that the polyacrylate coating films were successfully grafted onto the glass substrate and exhibited rough micro-groove structure. The obtained polyacrylate coating film possessed super-hydrophilicity with the water contact angle close to nearly zero as well as good transmittance and antifogging property.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2016
·Vol. 46
·期 12
·1177-1186
·
IF 2.223
Guo Jie,Hou Yongjiang,Li Bo,Wang Yaquan
Abstract The Ni–B-modified carbon paste electrodes were synthesized by the electroless deposition, followed by thermal treatment. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were performed to gather information about the morphology, crystallinity, and binding energy. The fabricated Ni–B/C electrodes are applied to methanol electrooxidation in alkaline media. The results show that Ni–B/C catalyst with a comparable amount of microcrystalline Ni and Ni 3 B, 59 and 41 wt%, displayed a significantly enhanced electrocatalytic activity, which is approximately three times the activity of the unheated Ni–B/C catalyst. The synergetic mechanism of methanol oxidation was proposed that involves one Ni 3 B site favor the adsorption and activation of the methanol molecule and one Ni site for oxidative mediation of methanol. In addition, the kinetic parameters of the reaction were calculated using linear sweep voltammetry. Graphical abstract The illustration of the speculated methanol oxidation mechanism.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·958-962
·
IF 1.798
Wang Han,Li Haiying,Li Shouchun,Liu Li,Wang Lianyuan,Guo Xuexin
Biomorphic In 2 O 3 –ZnO hollow microtubules were synthesized by using cotton as template and followed by calcination. This environmental-friendly method using biomaterials as templates can be used to synthesize metal oxide semiconductor materials with specific morphologies. The structural and microscopy characterization were carried out with X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy. The SEM images display the porous structure of the as-obtained hollow microtubules, which is beneficial to increase gas sensing properties of materials. Gas sensors based on In 2 O 3 -doped ZnO hollow microtubules were investigated and the test results demonstrate the excellent acetone sensing properties of such porous materials. The response of In 2 O 3 –ZnO hollow microtubule sensors to 100 ppm acetone at the optimum temperature of 300 °C is 62.5, meanwhile the response and recovery times are 3 and 7 s, respectively. Moreover, even at 0.1 ppm of acetone detectable response can be observed, and the value is 2.82. At the same time the sensors have selectivity to acetone.
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FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 8
·1123-1130
·
IF 1.022
Guo Mulin,Zhang Chao,Xu Jianjian,Luo Zhengwei,Wei Wuji
An efficient, simple and facile process, i.e., suspension grafting polymerization combined with melt-blown technique, was employed to synthesize Polypropylene-g-(acrylic acid-co-acrylamide) nonwoven fabrics [PP-g-(AA-co-AM) nonwovens]. In this study, the grafting mechanism and the effect of synthesis parameters on grafting percentage (GP) were investigated. The as-synthesized products were characterized by melt flow rate (MFR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), water contact angle (WCA) and thermalgravimetric analysis (TGA). Besides, the uptake properties of metal ions (i.e., Ba 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Al3+, Ca 2+ ) on the PP-g-(AA-co-AM) nonwovens in dynamic condition were studied. Results of FTIR showed that AA and AM were successfully grafted onto the PP surface. The decrease in WCAs of the grafted nonwovens with the increasing GP indicated that (AA-co-AM) side chains existed as the hydrophilic component. TGA results revealed that no significant change in thermal stability was found in grafted PP samples. The synthesis experiments showed that the highest GP was obtained at grafting time 3 h, water 3 ml/g, xylene 15 wt%, benzoyl peroxide 0.5 wt%, AA, AM 30 wt% and AA: AM 1:1, with a GP of 16.7 %, and a grafting efficiency of 67 %. However, MFR measurement and SEM image demonstrated that PP-g-(AA-co-AM) nonwovens with the highest GP showed almost no mechanical strength existed between filaments resulting in the occurrence of deformation and contraction of nonwovens, and breaking up into small pieces. Comprehensively, the optimal GP was 8.7 %, and the corresponding PP-g-(AA-co-AM) nonwovens exhibited higher metal ions uptake capacity than pristine PP nonwovens in the dynamic adsorption process.
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Botanical Studies
·
2016
·Vol. 57
·期 1
·1-11
·
IF 1.159
Shi Qiang-Qiang,Dang Jun,Wen Huai-Xiu,Yuan Xiang,Tao Yan-Duo,Wang Qi-Lan
Background
Dracocephalum heterophyllum was a traditional Tibetan medicine possesses various pharmacological effects involved in anti-inflammatory, antibacterial activities. However, its anti-hepatitis, antioxidant activity and bioactive compounds have not been reported, the objective of this research work was to investigate the pharmacological activity and bioactive compounds of D. heterophyllum extracts. Results In the present study, the anti-hepatics and antioxidant activities of four D. heterophyllum extracts (i.e. petroleum ether extracts, ethyl acetate extracts, n -BuOH extracts, and water extracts) were conducted. The main chemical constituent of petroleum ether and ethyl acetate extracts were also isolated using chromatographic techniques and identified by NMR spectroscopic methods. The anti-hepatitis assay showed that the petroleum ether and ethyl acetate extracts of D. heterophyllum significantly prolonged the mean survival times and reduced the mortality of mouse hepatitis model induced by concanavalin A (ConA). The levels of alanine transaminase, aspartate transaminase in blood serum could be decreased obviously by ethyl acetate extracts compared with ConA group (P < 0.01). The histological analysis demonstrated that the ethyl acetate extracts could inhibit apoptosis and necrosis caused by ConA. In addition, the antioxidant activities of the four extracts of D. heterophyllum were measured by DPPH assay, ABTS assay, anti-lipidperoxidation assay, ferric reducing antioxidant power assay, ferrous metal ions chelating assay and determination of total phenolic contents. The results showed that the ethyl acetate extract had the highest antioxidant activities, followed by petroleum ether extract. Finally, nine mainly compounds were isolated from the Petroleum ether and ethyl acetate extracts, including four triterpenes: oleanolic acid ( 1 ), ursolic acid ( 2 ), pomolic acid ( 3 ), 2α- hydroxyl ursolic acid ( 4 ), three flavonoids: apigenin-7- O -rutinoside ( 5 ), luteolin ( 8 ), diosmetin ( 9 ) and two phenolic acids: rosmarinic acid ( 6 ), methyl rosmarinate ( 7 ). Conclusion The Ethyl acetate extract of D. heterophyllum had the highest anti-hepatitis and antioxidants activities, followed by petroleum ether extract. The bioactive substances may be triterpenes, flavonoids and phenolic acids, the ethyl acetate extracts of D. heterophyllum may be possible candidates in developing anti-hepatitis medicine.
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高影响因子
Chemistry Central Journal
·
2017
·Vol. 11
·期 1
·1-10
·
IF 2.442
Yin Zhenhua,Zhang Wei,Zhang Juanjuan,Kang Wenyi
In this study, Ligustrum lucidum flowers as raw material, the extraction, isolation and coagulatory activity of polysaccharides were carried out for the first time. The crude polysaccharide was obtained by hot water extraction and ethanol precipitation, and preliminarily purified by Sevage method and D101 macroporous resin. Then the polysaccharide was further purified by DEAE-52 cellulose and Sephadex G-100 column chromatography, respectively. The structural characteristics were detected by LC, GC, FT-IR and NMR. Furthermore, the coagulatory activity of the polysaccharides were investigated by APTT, TT, PT and FIB assays in vitro. The results demonstrated that four polysaccharides were isolated from flowers of L. lucidum, named as LLP-1a, LLP-1b, LLP-2 and LLP-3, and the yields were 0.039, 0.0054, 0.0055 and 0.017%, respectively based on the weight of the dried flowers. The four polysaccharides components were free of nucleic acids and proteins, and their average molecular weights were 25,912, 64,919, 3,940,246 and 2,975,091 g/mol, respectively. The monosaccharide compositions of LLp-1a were l-rhamnose, l-arabinose, d-xylose, d-glucose and d-galactose (molar ratio of 3.16: 2.46: 1.00: 7.27: 4.22). Only d-galactose was detected from LLp-1b. LLp-2 was composed of l-arabinose, d-glucose and d-galactose (molar ratio of 1.28:1.32:1.00). LLp-3 was composed of l-rhamnose, l-arabinose, d-xylose, d-glucose and d-galactose (molar ratio of 5.85: 2.21: 2.23: 1.00: 2.25). Coagulation assays indicated that LLp-1a and LLp-3 had good anticoagulant effect in vitro, while LLp-1b showed procoagulant activity.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 44
·期 1
·1-11
·
IF 1.369
Yan Xuefeng,Gan Kaifeng,Tian Baozhu,Zhang Jinlong,Wang Lingzhi,Lu Deli
A yolk–shell-structured sphere composed of a superparamagnetic Fe 3 O 4 core and a carbon shell (Fe 3 O 4 @HCS) was etched from Fe 3 O 4 @SiO 2 @carbon by NaOH, which was synthesized through the layer-by-layer coating of Fe 3 O 4 . This yolk–shell composite has a shell thickness of ca. 27 nm and a high specific surface area of 213.2 m 2 g −1 . Its performance for the magnetic removal of tetracycline hydrochloride from water was systematically examined. A high equilibrium adsorption capacity of ca. 49.0 mg g −1 was determined. Moreover, the adsorbent can be regenerated within 10 min through a photo-Fenton reaction. A stable adsorption capacity of 44.3 mg g −1 with a fluctuation <10% is preserved after 5 consecutive adsorption–degradation cycles, demonstrating its promising application potential in the decontamination of sewage water polluted by antibiotics.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 8
·1512-1522
·
IF 1.113
Li Qiaoping,Xu Bin,Wang Yan,Zhuang Linghua,Wang Qiang,Li Chao,Xu Xiaoqing,Wang Guowei
3-methyl-1-ethoxycarbonylimidazolium chloride ([EtMIM]Cl), was synthesized for white hide powder dissolution. White hide powder was successfully dissolved in [EtMIM]Cl, and regenerated from methanol. The dissolution data and thermodynamic parameter of white hide powder in [EtMIM]Cl and [BMIM]Cl were studied. Hydrogen bond basicity (β) and general polarizability (π*) of ILs were determined. The white hide powders were characterized by FT-IR, XRD, and TGA. The results showed that the maximum solubility of white hide powder in [EtMIM]Cl was higher than that in [BMIM]Cl at same dissolution temperature. At same temperature and same solid content, the dissolution time of white hide powder in [EtMIM]Cl was shorter than that in [BMIM]Cl. Density functional theory (DFT) simulation showed that two kinds of hydrogen bonds (C-H/O and C-H/Cl) and eight strong hydrogen bonds are found in [EtMIM]Cl/GPH, while seven hydrogen bonds are found in [BMIM]Cl/GPH. The carboxylic acid ester cationic group in [EtMIM] + has more electronegative ester groups and stronger electronic cloud density oxygen atoms than alkyl group in [BMIM] + , [EtMIM]Cl is easier to destroy the intermolecular or intramolecular hydrogen bonds in white hide powder, so as to accelerate the dissolution of white hide powder in [EtMIM]Cl. The molecular simulation results indicated that both Cl − anions and [EtMIM] + cation played important roles in the white hide powder dissolution.
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危险品化学品经营许可证（带存储）