SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Donghai Wu,Chao Zhou,Guanghua Lu,Ying Zhou,Ye Shen
In this work, the effects of electro-peroxone (E-peroxone, i.e. combination of ozonation and electrolysis using a carbon based cathode) assistance on microfiltration (MF) was systematically investigated from the performance and mechanism viewpoints. Results show that E-peroxone oxidation exhibited better ability than individual processes in membrane fouling mitigation when using bovine serum albumin (BSA), humic acid (HA) and silicon dioxide (SiO 2 ) particles as model foulants. The relative fluxes at 250 s E-peroxone assisted MF treatment were determined to be ~0.30–0.71, which are > 15% higher than those in single ozonation or electrolysis assisted MF process. The efficiency of E-peroxone process in membrane fouling reduction was positively correlated with the applied voltage (0–4 V) and inlet ozone concentration (0–48.6 mg/L). The experimental data combined with three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) analysis indicate that simultaneous fouling mitigation and emerging pollutant benzophenone-3 (BP3) removal could be obtained during actual river water treatment. Furthermore, the comparison tests reveal that generation of hydroxyl radicals (HO ) via enhanced O 3 /H 2 O 2 decomposition had a significant role on the organic contaminant degradation and membrane fouling mitigation in E-peroxone assisted MF process, and the introduced electrostatic repulsion force could also contribute to the fouling reduction. These observations suggest that E-peroxone maybe a feasible assistive method for membrane filtration water treatment.
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Yi Zhang,Chunli Lou,Yao Xu,Jing Li,Shanshan Qian,Feng Li,Jingwu Kang
Jumonji domain-containing proteins (JMJDs) play an important role in the epigenetic regulation of gene expression. Aberrant regulation of histone modification has been observed in the progression of a variety of diseases, such as neurological disorders and cancer. Therefore, discovery of selective modulators of JMJDs is very attractive in new drug discovery. Herein, a simple capillary electrophoresis (CE) method was developed for screening of inhibitors against JMJD3. A known JMJD3 inhibitor GSK-J1, 5-carboxyfluorescein labeled substrate peptide with an amino acid sequence of KAPRKQLATKAARK(me3)SAPATGG (truncated from histone H3), as well as a small chemical library composed of 37 purified natural compounds and 30 natural extracts were used for method development and validation. The separation of substrate from its demethylated product was achieved by addition of polycation hexadimethrine bromide (HDB) in the running buffer. The enzyme activity was thus assayed accurately through separating the demethylated product from the substrate and then measuring the peak area of the product. The enzyme inhibition can be read out by comparing the peak area of the demethylated product obtained in the present of inhibitors and that of the negative control in the absence of any inhibitor. The merit of the method is proved by discovering two new JMJD3 inhibitors: salvianic acid A and puerarin 6′’-O-xyloside.
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POLYMER
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2018
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IF 3.483
Yanyun Li,Tao Jing,Gaofeng Xu,Jingzhi Tian,Mengyao Dong,Qian Shao,Bin Wang,Zhikang Wang,Yongjie Zheng,Changlong Yang,Zhanhu Guo
Three-dimensional magnetic graphene oxide-magnetite polyvinyl alcohol (3D-GO/PVA/Fe 3 O 4 ) nanocomposites were successfully prepared. The morphology was characterized and analyzed through scanning electron microscope (SEM) and transmission electron microscope (TEM). The chemical structure and the crystal structure were explored by X-ray powder diffraction (XPS), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction spectra (XRD). The magnetic property was obtained by vibrating sample magnetometer (VSM). The specific surface area and the average pore size were determined by Brunauer-Emmett-Teller (BET) and Barrett–Joyner–Halenda (BJH). The specific surface and the average pore size of 3D-GO/PVA/Fe 3 O 4 nanocomposites were 388.87 m 2 g -1 and 9.6 nm, and the higher specific surface indicated that the three-dimensional structure avoided the aggregation for GO sheets. The large saturation magnetization (M s ) of the nanocomposites of 30.5 emu/g enabled the easy cycling of the nanocomposites. The 3D-GO/PVA/Fe 3 O 4 nanocomposites exhibited better performance for porcine pancreatic lipase (PPL) enzyme immobilization. The maximum immobilization efficiency was 91%, and the enzyme immobilized 3D-GO/PVA/Fe 3 O 4 nanocomposites reached up to 90% of their activities. After 10 cycles of reuse, the activity of immobilized enzyme remained about 70.8% of the initial activity. The stability test revealed that the activity of immobilized enzyme remained up to 71.1% at 4 °C for 56 days.
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Ganggang Chong,Junhua Di,Cuiluan Ma,Dajing Wang,Chu Wang,Lingling Wang,Pengqi Zhang,Jun Zhu,Yucai He
In this study, biomass-hydrolysate was used for enhancing the bioreduction of ethyl 4-chloro-3-oxobutanoate (COBE). Firstly, dilute alkalic salt pretreatment was attempted to pretreat bamboo shoot shell (BSS). It was found that enzymatic in situ hydrolysis of 20–50 g/L BSS pretreated with dilute alkalic salts (0.4% Na 2 CO 3 , 0.032% Na 2 S) at 7.5% sulfidity by autoclaving at 110 °C for 40 min gave sugar yields at 59.9%–73.5%. Moreover, linear relationships were corrected on solid recovery-total delignification-sugar yield. In BSS-hydrolysates, xylose and glucose could promote the reductase activity of recombinant E. coli CCZU-A13. Compared with glucose, hydrolysate could increase the reductase activity by 1.35-folds. Furthermore, the cyclohexane-hydrolysate (10:90, v/v) biphasic media containing ethylene diamine tetraacetic acid (EDTA, 40 mM) and l -glutamine (150 mM) was built for the effective biosynthesis of ethyl ( R )-4-chloro-3-hydroxybutanoate [( R )-CHBE] (94.6% yield) from 500 mM COBE. In conclusion, this strategy has high potential for the effective biosynthesis of ( R )-CHBE (>99% e.e. ).
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Taiwan Liao,Ting Li,Xiangde Su,Xiang Yu,Huiyu Song,Yi Zhu,Yuanming Zhang
A series of La(OH) 3 -modified magnetic pineapple biochar (La x -MC) with different contents of La(OH) 3 were prepared and used as phosphate adsorbents for the first time. With the increase of La(OH) 3 content, the adsorption capacity for phosphate increased while the magnetic property decreased. La10-MC exhibited excellent magnetic property for easy recovery and high adsorption capacity up to 101.16 mg P/g, which was 27 times that of pineapple biochar and much higher than most phosphate adsorbents. Adsorption isotherm and adsorption kinetics were better fitted by Langmuir model and pseudo second-order model, respectively. The removal efficiency >96.04% in coexisting ions indicated its high selectivity to phosphate. Little decrease in removal efficiency after three adsorption-desorption cycles suggested its excellent stability and cyclic utilization. Leaching study demonstrated the negligible risk of La 3+ and Fe 3+ leakage during adsorption process. Mechanism study revealed that the adsorption mechanism involved precipitation, electrostatic interaction, ligand exchange and inner-sphere complexation.
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CATALYSIS SURVEYS FROM ASIA
·
2018
·Vol. 22
·期 4
·222-229
·
IF 3.081
Gao Meixiang,Jiang Haoxi,Zhang Minhua
Series of ZrO 2 supported on the different kinds of SiO 2 carriers were applied in the reaction of 1, 3-butadiene formation from ethanol and acetaldehyde. ZrO 2 /Nano-SiO 2 performed the best performance with the 1, 3-butadiene selectivity 91.43% and the total conversation 52.39%. Prepared catalysts were characterized by N 2 adsorption–desorption, TEM, XRD, temperature-programmed desorption of NH 3 and CO 2 , FTIR spectroscopy of adsorbed pyridine and CO 2 , Raman XPS. The results show that the weak Lewis acid and basic sites are appropriate for BD formation. Furthermore, more and balance acid-basic sites are rather important for the reaction of ethanol and acetaldehyde conversion to BD.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
H.Z. Li,W.Z. Li,Y.J. Yang,H.L. Tai,X.S. Du,R.Y. Gao,S.Y. Li
Pyroelectric properties of 1–3 ceramic/polyvinylidene fluoride (PVDF) composites by using barium titanate nanowires (BTnws) and dopamine modified BTnws (DM-BTnws) as inclusions were firstly reported. 0–3 composites based on dopamine modified BT nanoparticles (DM-BTnps)/PVDF were also prepared for comparison. It was found that low contents of DM-BTnws in PVDF are beneficial for achieving high fraction of β-phase content based on the analysis results of X-ray diffraction (XRD), Fourier transform infrared (FTIR) and electric displacement-electric field ( D-E ) measurements. The enhancement of β-phase content in the DM-BTnws/composited film was believed to originate from strong hydrogen bonds interactions between poly-dopamine and PVDF molecules, which induced phase transition in PVDF from α-phase into β-phase. However, although DM-BTnws improved β-phase content and, accordingly, pyroelectric coefficient of the composites, they deteriorated dielectric performances of PVDF, reducing pyroelectric performances of the composites in terms of voltage and detectivity figures of merit.
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JOURNAL OF CHROMATOGRAPHY A
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2018
·
IF 3.716
Jianlin Peng,Meiling Qi
This work describes the investigation of utilizing a chain-typed thiophene-based π-conjugated polymer, i . e ., poly(3-hexylthiophene) (P3HT), as the stationary phase for gas chromatography (GC). The P3HT column was statically prepared and investigated for its column efficiency, polarity, separation performance, repeatability and thermal stability. As a result, it showed moderate polarity and column efficiencies of 3260, 3310 and 3790 plates/m for 1-octanol, naphthalene and n -dodecane, respectively. As evidenced, it exhibited high-resolution performance for aliphatic and aromatic isomers, including those critical pairs such as phenanthrene/anthracene and p -/ m -benzenediol isomers. Moreover, it displayed stronger retention for alkanes, alcohols and phenols in comparison to the polysiloxane stationary phase with close polarity. Also, the P3HT column had good repeatability and reproducibility with the RSD values less than 0.05% for run-to-run, 0.17–0.54% for day-to-day and 2.7–5.2% for column-to-column, and good thermal stability up to 260 °C. This work demonstrates the promising future of the thiophene-based polymer and its derivatives in separation science.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2018
·
IF 1.454
Dongfang Liu,Youlin Ma,Jiang Tan,Lu Wang,Quanwu Tang,Hongsheng Lu
We reported that the phase conversion of the micelles in aqueous solution prepared by sodium oleate (NaOA) and 3-(diethylamino)-propylamine (DEAPA) in the presence of carbon dioxide. This micellar structure is very sensitive to CO2 and the pH value of the solution is continuously reduced with the continuous introduction of carbon dioxide. When pH > 10.2, the mixed solution of NaOA and DEAPA is mainly in the form of spherical micelles; when the 10.2 > pH > 9.6, the mixed solution mainly in the worm-like micelles (WLM), where the solution has a significant viscosity change; when the 9.6 > pH > 9.1, the NaOA and DEAPA mixed solution becomes the aqueous two-phase system (ATPS), which is composed of two layers, the upper layer is the vesicle structure and the lower layer is the WLM structure; when the pH between 9.1 > pH > 9.0, NaOA and DEAPA mixed solution form vesicles, thus realizing the regulation of CO2 on the micellar structure transition of NaOA and DEAPA mixed solution. Such these microstructures transition could be confirmed by Rheology measurement, DLS and Cryo-TEM.
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Soft Matter
·
2018
·Vol. 14
·期 21
·4231-4237
·
IF 3.709
Dahua Li,Yuzhi Xing,Lan Ding,Chengfeng Wu,Guangliang Hou,Bo Song
3-Hydroxyflavone derivatives have great potential as fluorescent probes for bio-labeling in aqueous medium. They were extensively studied in various organic solvents for the “excited state intramolecular proton transfer” process, but seldom addressed in aqueous solution due to the poor water solubility. Herein, an amphiphilic molecule bearing 3-hydroxyflavone and oligo(ethylene oxide) (denoted as 3HF-EO) was designed and synthesized. Different from the fluorescence in organic solvents, 3HF-EO in aqueous solution showed a remarkable single fluorescence emission, which is ascribed to the fluorescence of its anionic species. We found that the fluorescence intensity could be efficiently tuned via host–guest complexation. α-CD has little effect on the emission, while β-CD and γ-CD lead to enhanced and reduced emissions of 3HF-EO, respectively. The 1H NMR and 2D NOESY NMR spectra indicate that α-CD barely had any interaction with 3HF-EO, while β-CD and γ-CD formed complexes with one and two 3HF-EO molecules, respectively. These results provide a sound explanation for the modulated fluorescence intensity.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2012
·Vol. 18
·期 5
·315-319
·
IF 0
Feng Yakai,Chen Chengbin,Zhang Li,Tian Hong,Yuan Wenjie
A series of novel copolymers were successfully synthesized by ring-opening polymerization (ROP) of 3(S)-methyl-morpholine-2,5-dione (MMD) and 5-methyl-5-benzyloxycarbonyl-1,3-dioxan-2-one (MBC) using stannous octoate as catalyst. The copolymers were characterized by means of 1H-NMR and FT-IR spectroscopy. Gel permeation chromatography (GPC) test shows that the average-number relative molecular mass and average-weight relative molecular mass slightly increase with the increase of MBC content in feed. The results of differential scanning calorimetry (DSC) demonstrate that the glass transition temperature of copolymers increases with the increase of MBC content in copolymers. The copolymers of MMD and MBC are amorphous copolymers, as indicated by DSC results, while the homopolymer of MMD is semicrystalline.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Jinxia Zhou,Tingyu Huang,Yuling Zhao,Zhi Xia,Zhanwei Xu,Songyan Jia,Jianji Wang,Z. Conrad Zhang
Ionic liquids have been widely studied as effective reaction media for the conversion of glucose or cellulose to 5-hydroxymethhylfurfural (5-HMF). However, the recovery of 5-HMF from ionic liquids, typically carried out by extraction, has been encountered with very low extraction efficiency, which limited the reusability of the solvents. Through this work, based on the model biphasic system that consists of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the ionic liquid phase and methyl isobutyl ketone (MIBK) as the extractant phase, the dominant force that suppresses the extraction efficiency of 5-HMF was identified as being the strong hydrogen bonding between 5-HMF and [BMIM]Cl. Solvent mediation with functional promoters have been established as a new strategy to shift this force, resulting in improved extraction efficiency of 5-HMF from the ionic liquid. For example, with ethanol as a promoter, the distribution coefficient of 5-HMF was about 10 times higher than that without a promoter.
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危险品化学品经营许可证（带存储）