JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2019
·Vol. 321
·期 2
·733-745
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IF 1.186
Hu Peizhuo,Nan Yu,Tai Wenya,Shan Qiang,Zhong Yi,Lei Zhiwei,Liu Tonghuan,Chen Suwen,Qian Lijuan
Modification of silica gel by butanedioic anhydride (SiO 2 –BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO 2 –BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N 2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO 2 –BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10 −5 , 5.06 × 10 −5 , and 3.44 × 10 −5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO 2 –BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
研究领域:
环境科学
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放射化学
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DOI
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 11
·期 4
·867-875
·
IF 2.786
Liu Weiwei,Li Qian,Zhang Yin,Liu Tengfei,Wang Li,Li Huayi,Hu Youliang
Reversible addition-fragmentation chain transfer radical polymerization of styrene and maleic anhydride was successfully performed in continuous-flow microreactor. Results of the structural characterization showed that the obtained styrene-maleic anhydride (SMA) copolymers possessed controlled molecular weight, low dispersity and alternating structures. Subsequently, effects of the polymerization conditions, including reaction pressure, temperature, feed flowrate and tube length, on the polymerization kinetics and molecular structure of the SMA copolymers were investigated in detail. It was found that the reaction rate was increased as the reaction temperature increased within certain limits, as well as the feed flowrate due to the increased mass and heat transfer efficiency. Besides, first-order kinetics of the polymerization was observed when the reaction times were adjusted by only changing the tube length. Good stability was exhibited when the reaction conducted continuously for 10 h. This approach can reduce the reaction time significantly from several hours to about half an hour.
研究领域:
化学工程
·
高分子科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2017
·
IF 0
Jiale Cui,Zhihua Zhou,Yun Yang,Wenjuan Liu,Yunfei Zhao,Cheng Peng,Tianlong Huang,Hu Zhou,Lihua Liu,Qiao Zhang
In order to improve hydrophilicity and settle the acidity in hydrolysis, a novel ethanediamine (EDA) and maleic anhydride (MAH) modified poly(D,L-lactide-co-glycolide) (PLGA) polymer (EMPLGA) was synthesized. Fourier Transform Infrared Spectrometer (FTIR), Gel Permeation Chromatography (GPC), Nuclear Magnetic Resonance (1HNMR), titration and the water contact angles were employed to characterize the synthesized polymer. The effects of various polymerization conditions on weight average molecular mass (Mw), polydispersity index (PDI) and anhydride content of MPLGA were investigated. The degradation behaviors of PLGA, MPLA and EMPLGA were also studied by observation of the changes of the pH value of incubation medium, molecular weight and weight loss ratio for a time interval of 25 days in-vitro, respectively. The results showed that MPLGA with high anhydride content was successfully obtained by directly ring-opening polymerization and ethanediamine was further grafted onto MPLGA, and there is almost unchanged in Mw between MPLGA and EMPLGA polymers. The introduction of anhydride and amino groups improved the hydrophilicity of PLGA. A uniform degradation of EMPLGA was observed in comparison with an acidity-induced auto-accelerating degradation featured by PLGA and MPLGA. The results revealed that the introduction of ethanediamine into PLGA has weakened or neutralized the acidity of PLGA degradation products.
研究领域:
材料科学
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生物医学工程
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DOI
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 53
·12233-12241
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IF 4.857
Chunlei Tan,Na Wang,Qichang Pan,Yan Li,Yu Li,Qiannan Ji,Xiaoping Fan,Fenghua Zheng,Hongqiang Wang,Qingyu Li
Graphical Butyric anhydride was used as carbonate-based electrolyte additive to construct a thin, uniform cathode–electrolyte interphase (CEI) film that can alleviate the decomposition of the electrolyte and prevent the dissolution of metal ions to maintain the structural stability of LiNi 0.5 Mn 1.5 O 4 (LNMO) during the cycling process, and improve the electrochemical performance of LNMO cathodes in carbonate-based electrolytes. Butyric anhydride (BA) is used as an effective functional additive to improve the electrochemical performance of a high-voltage LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode. In the presence of 0.5 wt % BA, the capacity retention of a LNMO/Li cell is significantly improved from 15.3 to 88.4 % after 200 cycles at 1 C. Furthermore, the rate performance of the LNMO/Li cell is also effectively enhanced, and the capacity goes up to 112 mAh g −1 even at 5 C, which is considerably higher than that of a LNMO/Li cell in electrolyte without BA additive (95.4 mAh g −1 at 5 C). Linear sweep voltammetry and cyclic voltammetry results reveal that the BA additive can be preferentially oxidized to construct a stable cathode electrolyte interphase (CEI) film on the LNMO cathode. Subsequently, the BA-derived CEI film can alleviate the decomposition of the electrolyte and the dissolution of Mn and Ni ions from the LNMO cathode as well as maintain the structural stability of LNMO during the cycling process; this leads to outstanding electrochemical performance. Thus, this work provides an effective and low-cost functional electrolyte for high-voltage LNMO-based LIBs.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2019
·Vol. 35
·期 8
·903-909
·
IF 1.618
Xinmin HU,Fang LIU,Wenti LI,Xiaochun WANG,Hongyu DENG
Ferrocenylmethanol (Fc-OH) is included in β-cyclodextrin (β-CD) to form the β-CD-Fc-OH complex by host-guest supramolecular interaction. β-CD dissociates from the β-CD-Fc-OH complex due to the conversion of Fc-OH to Fc+-OH under a stimulus of oxidant. In our study, Fc-OH is oxidized after a series of enzymatic reactions of creatinine, which blocks the other means for oxidation of Fc-OH. And the background noise is reduced for testing for serum creatinine (sCr). The chronoamperometry signal for creatinine (with a constant potential –0.3 V vs. Ag/AgCl) increases linearly in the 1 – 1000 μM range, with a limit of detection as low as 0.5 μM. The amperometric potential of –0.3 V greatly prevents the interference of various redox substances in serum. The biosensor was used to test 120 clinical specimens and the results showed a linear correlation with the biochemical analyzer (R2 = 0.9885). The biosensor could be applied to clinical trials and offers good prospects for clinical sCr detection.
研究领域:
医学检验
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生物化学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2012
·Vol. 90
·期 2
·265-272
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IF 1.773
Chengsheng Gui,Xiaoqing Liu,Di Wu,Tuo Zhou,Guyue Wang,Jin Zhu
The most commonly used curing agents for soy-based adhesives are polyamines, which have the problem of low solid content and/or high viscosity. To overcome this problem, a new type of polyamidoamine (PADA) resin was synthesized and applied to soy flour-based adhesives to improve their water resistance. The PADA solution obtained had a high solid content of 50 wt% and low viscosity of 270 cP. The optimum weight ratio of soy flour/PADA/maleic anhydride to prepare adhesive was 40/7/1.68. The wet strength of plywood prepared at the optimum weight ratio was 0.82 MPa, which meant the plywood could be used as type II plywood according to the Chinese National Standard GB/T 9846.7-2004. The results of water-insoluble solid content measurement and SEM observation demonstrated that cured soy flour–PADA–maleic anhydride adhesive had a 16 % greater water-insoluble solid content than soy flour–NaOH adhesive. The cross-linking network formed by the reactions of PADA and MA would increase the water-insoluble solid contents and improve water resistance of cured soy flour-based adhesives.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
AICHE JOURNAL
·
2017
·Vol. 63
·期 11
·4933-4943
·
IF 2.836
Bin Liu,Xiao Luo,Zhiwu Liang,Wilfred Olson,Helei Liu,Raphael Idem,Paitoon Tontiwachwuthikul
CO 2 absorption into aqueous solutions of two tertiary alkanolamines, namely, MDEA and DMEA with and without carbonic anhydrase (CA) was investigated with the use of the stopped-flow technique at temperatures in the range of 293–313 K, CA concentration varying from 0 to 100 g/m 3 in aqueous MDEA solution with the amine concentration ranging from 0.1 to 0.5 kmol/m 3 , and CA concentration varying from 0 to 40 g/m 3 in aqueous DMEA solution with the amine concentration ranging from 0.05 to 0.25 kmol/m 3 . The results show that the pseudofirst-order reaction rate (k 0, amine ; s −1 ) is significantly enhanced in the presence of CA as compared with that without CA. The enhanced values of the kinetic constant in the presence of CA has been calculated and a new kinetics model for reaction of CO 2 absorption into aqueous tertiary alkanolamine solutions catalyzed by CA has been established and used to make comparisons of experimental and calculated pseudo first-order reaction rate constant (k 0, with CA ) in CO 2 -MDEA-H 2 O and CO 2 -DMEA-H 2 O solutions. The AADs were 15.21 and 15.17%, respectively. The effect of pKa on the CA activities has also been studied by comparison of CA activities in different tertiary amine solutions, namely, TEA, MDEA, DMEA, and DEEA. The pKa trend for amines were: DEEA > DMEA > MDEA > TEA. In contrast, the catalyst enhancement in amines was in the order: TEA> MDEA> DMEA> DEEA. Therefore, it can be seen that the catalyst enhancement in the amines decreased with their increasing pKa values. © 2017 American Institute of Chemical Engineers AIChE J , 2017
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2017
·Vol. 91
·期 8
·1432-1438
·
IF 0.581
Wang Long,Zhang Fang,Gao Xiaoqiang,Luo Tingliang,Xu Li,Liu Guoji
The solubility of phthalic anhydride was measured at 283–313 K under atmospheric pressure in ethyl acetate, n -propyl acetate, methyl acetate, acetone, 1,4-dioxane, n -hexane, n -butyl acetate, cyclohexane, and dichloromethane. The solubility of phthalic anhydride in all solvents increased with the increasing temperature. The Van’t Hoff equation, modified Apelblat equation, λ h equation, and Wilson model were used to correlate the experimental solubility data. The standard dissolution enthalpy, the standard entropy, and the standard Gibbs energy were evaluated based on the Van’t Hoff analysis. The experimental data and model parameters would be useful for optimizing of the separation processes involving phthalic anhydride.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Yao Zhang,Lunan Guo,Dan Xu,Dandan Li,Na Yang,Feng Chen,Zhengyu Jin,Xueming Xu
This research aimed at investigating the effects of different weight-average molecular weights ( M w : T10, T70, T250, T750, T2000) of dextran (α-(1 → 6)-linked linear backbone, α-(1 → 3)-linked branching) on wheat sourdough bread qualities. Texture analyzer showed that dextran contributed to a significant inhibition of bread staling, particularly dextran T2000. Pasting profiles (Rapid visco-analysis) and steady rheological properties (steady shear measurements) of samples indicated that dextran T2000 suppressed the swelling and gelatinization of wheat starch granules and bound a great amount of water, thus retarding the aging process. Dextran T2000 markedly improved the elastic properties of sourdough-containing dough. Wheat sourdough breads containing dextran T10 exhibited unexpected less firm crumb structure. The improvement of bread qualities was a function of the M w of dextran. Dextran with high M w values has the potential for improving the quality of wheat sourdough breads, especially extending shelf life.
研究领域:
食品科学
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Zhenwei Yang,Jihong Sun,Xia Wu,Shiyang Bai,Hamida Panezai
The Fe 3+ -modified 1, 8-naphthalic anhydride (Fe-NA) was prepared, and thereafter successfully grafted on the mesoporous surface of bimodal mesopores material (BMMs) by post-synthesis method. The influence of various parameters, including amount of Fe 3+ ion, various solvents, different concentrations and loadings of FC-NA on the fluorescence behavior of resultant hybrid materials (FC-NA grafted BMMs) was investigated, and then its fluorescence properties were compared to the parent FC-NA. Meanwhile, their structural properties and photoluminescence performances were investigated using various characterizations XRD , TEM , SEM, SAXS , FT-IR, TGA, ICP-OES, elemental analysis , N 2 adsorption-desorption isotherms, and fluorescence measurement. The results showed that the mesoporous structural integrity was remained intact after introduction of FC-NA in the mesoporous channels of APTES-BMMs. Particularly, SAXS patterns revealed the mass fractal dimension of the hybrid FC-NA@BMMs were gradually increased with increasing loaded amount of FC-NA, and resulted in the uneven distribution and self-similarity fractal features. The fluorescence profiles exhibited the occurrence of red-shifts and then blue-shifts of characteristic peak with increasing grafted FC-NA amount. These shifts demonstrated a highly aggregation on the amine-modified mesoporous surface of APTES-BMMs when the obtained mass ratio of FC-NA/AP-BMMs was lower than 0.2, whereas a uniform monodispersion distribution was observed when the mass ratio got higher than 0.2. The obtained functionalized mesoporous materials with enhanced fluorescence intensity have a potential application in drug sustained/controlled delivery systems.
研究领域:
材料科学
·
光学
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DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Lan Yang,Wenzhong Yang,Bin Xu,Xiaoshuang Yin,Yun Chen,Ying Liu,Yan Ji,Ying Huan
A novel environmental friendly and hydrophilic terpolymer with the sulfonic group and ether group was synthesized by maleic anhydride (MA), 2-acrylamido-2-methylpropanesulphonic acid (AMPS) and 3-allyloxy-2-hydroxy-1-propanesulfonate (AHPSE) in free radical polymerization . The structure of MA/AMPS/AHPSE was characterized by the 13 C nuclear magnetic resonance, Fourier transform infrared spectroscopy spectra, Ultraviolet Visible spectrophotometer and gel permeation chromatography . The inhibition performance of CaCO 3 and zinc scales and the dispersion property of ferric oxide were investigated by static scale inhibition methods. The terpolymer had the best inhibition performance when the weight-average molecular weight ( M w ) was 2.41 × 10 4 , namely the ratio of MA/AMPS/AHPSE was 6/2/0.8. With the optimal M w , the inhibition performance of the terpolymer was superior to that of MA/AMPS, AA/AMPS and PAA. The transmittance ratio of ferric oxide solution was 44.9% at 14 mg/L and the inhibition efficiency of zinc scales reached 89.8% at 10 mg/L. The results revealed that the suitable M w and pluralistic functional groups of this typical terpolymer were the main keys for the excellent inhibition performance. The modified CaCO 3 scales in the presence of MA/AMPS/AHPSE were analyzed by X-ray powder diffraction and scanning electron microscope .
研究领域:
化学工程
·
环境科学
·
材料科学
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DOI
高影响因子
Biomedical Optics Express
·
2018
·Vol. 9
·期 10
·4988-4997
·
IF 3.482
Yudong Lu,Changji Wu,Ruiyun You,Yang Wu,Huiying Shen,Lanjin Zhu,Shangyuan Feng
Superhydrophobic silver films were fabricated by silver-mirror reaction and surface functionalization with thiol. The thiol-functionalization significantly improved the hydrophobic property of the Ag films (AFS), and their contact angle values slightly increased with the extension of a thiol alkyl chain, reaching about 160°. The surface-enhanced Raman scattering (SERS) detection capacity of these films were investigated, and AFS-Dodec showed the best substrate for R6G molecule detection with the concentration limit of 10−11 M. AFS functionalized with dodecanethiol (AFS-Dodec) was applied for the SERS detection of uric acid and creatinine, it exhibited good linear dependence relationship between the Raman intensity and analyte concentration in the concentration range of 5~1000 μM.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）