JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Kui Wu,Yajun Li
The solubility of 2-aminobenzamide in 15 pure organic solvents, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, n-hexanol, n-octanol, acetone, ethyl acetate, acetonitrile, tetrahydrofuran, and methyl acetate, was measured using a gravimetric method over the temperature range from 273.15 to 324.15 K under atmosphere pressure. Four thermodynamic models, that is, Apelblat equation, λh equation, nonrandom two-liquid equation, and Wilson equation, were applied to correlate the measured solubility data. The correlation results were evaluated by the relative average deviation. The results indicated that the mole fraction solubility increased with the rising of temperature in all 15 solvents, and the Wilson model gave the best fitting results. The experimental data and correlation models would be useful in the purification and synthesis process of 2-aminobenzamide.
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SEPARATION SCIENCE AND TECHNOLOGY
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2019
·
IF 1.354
Guichen Gong,Jie Liu,Yuexin Han,Yimin Zhu
A novel collector, 2-carboxyethylphenylphosphinic acid (CEPPA), was first used in the flotation of cassiterite. The flotation performances and the adsorption mechanism of CEPPA on cassiterite were investigated by flotation tests, adsorption experiments, zeta potential measurements, Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. The results indicated that CEPPA had strong collecting power for cassiterite and fluorite over a wide pH range but little on quartz. In the separation of the cassiterite–quartz mixture, a concentrate containing 90.9% SnO2 was obtained with a recovery of 95.7% at pH 7.0. The cassiterite in the cassiterite–fluorite mixture could be effectively separated using 300 mg/L sodium silicate in conjunction with 60 mg/L CEPPA, and a concentrate with a grade of 90.3% SnO2 and a recovery of 92.6% was achieved at neutral pH. Zeta potential analysis demonstrated that the adsorption process involved both physical and specific forces. The results of FTIR and XPS further suggested that the four O atoms of CEPPA reacted with the Sn atoms on cassiterite surface, forming a complex which was similar to the Sn–CEPPA precipitate, and hydrogen bonding adsorption could have taken place between the terminal hydroxyl groups and CEPPA anions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Chengbo Wei,Chuan Liu,Linna Gao,Yanfang Sun,Qingyun Liu,Xiao Zhang,Jinxue Guo
Integrating heterogeneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts into compatible composite catalysts with specific interfaces and structures holds great promise for the development of efficient bifunctional catalysts for overall water splitting. Herein, heterogeneous MoS 2 -Ni(OH) 2 catalyst supported by Ni foam (MoS 2 @Ni(OH) 2 /NF) is developed, in which the Ni(OH) 2 nanorod array is grafted with MoS 2 nanosheets . The hierarchical 1D/2D structures benefit not only the exposure of catalytic site but also the facilitated charge transfer. The heterointerfaces allow the synergism of electric structure modulation for improved catalytic activity and kinetics towards HER, OER, and overall water splitting. MoS 2 @Ni(OH) 2 /NF achieves a current density of 10 mA cm −2 at low overpotentials of 134 and 233 mV for HER and OER in 1 M KOH, respectively. Moreover, a cell voltage as low as 1.46 V is obtained to afford 10 mA cm −2 in a tow-electrode electrolyzer using MoS 2 @Ni(OH) 2 /NF as bifunctional catalysts, assuring it superior to most of the reported noble-metal-free bifunctional electrocatalysts. Such heterogeneous design of composite catalyst should shed light on the exploration of functional materials for energy applications.
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ACS Applied Materials & Interfaces
·
2018
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IF 8.097
Wen Yang,Fangbing Liu,Ran Li,Xiaoji Wang,Wentao Hao
Multiresponsive fluorescent supramolecular materials are quite interesting, for they combine the multiresponsiveness of supramolecules and the high sensitivity of fluorescent materials. Different from the multiresponsive supramolecular materials based on host–guest interactions, in this report, a supramolecular ionic network was fabricated by 1-(2-aminoethyl)piperazine and citric acids via ionic interactions. Despite the fact that there are no conventional chromophores, the obtained supramolecular ionic material can emit strong fluorescence. Most interestingly, the thin film of this supramolecular ionic material can change its fluorescent intensity in response to four external stimuli, including humidity, triethylamine, acetic acid, and temperature. Beneficial to the supramolecular ionic structure, this multiresponsive fluorescent sensor is self-healable. It is found that a new route has been opened to prepare the multiresponsive fluorescent sensors.
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PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2018
·期 38
·4255-4264
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IF 2.507
Shengju Zhou,Lin Wang,Zaiwu Yuan,Mengjun Chen,Geping Zhang,Hongguang Li
Graphical A unique amphiphile was prepared whereby two Dawson polyoxometalates were covalently connected to one fullerene C 60 sphere. The amphiphile shows tunable aggregation behaviour in single and binary solvent mixtures controlled by collective effects of π–π interaction, electrostatic interaction and solvophobic effect. Two-dimensional plates, solid spheres and vesicles have been observed, which represent a new class of multifunctional materials. An organic-inorganic hybrid ( 5 ) is synthesized where two Dawson polyoxometalate (POM) moieties are linked to one fullerene C 60 unit. In a POM-friendly solvent such as DMSO, DMF and CH 3 CN, 5 forms small vesicles below 100 nm at a concentration of 37.3 mg mL –1 . When the concentration decreases to 9.0 mg mL –1 , detection of aggregates becomes difficult. However, supramolecular structures with diverse morphologies can be induced upon the addition of H 2 O or toluene. In DMSO/H 2 O and DMF/H 2 O systems, plates form, which break to debris and small vesicles at high volume percentage of H 2 O. In CH 3 CN/H 2 O mixtures, solid spheres form, which fail to further evolve into other self-assembled structures. In DMSO-based binary mixtures, the type of poor solvent has a big influence on the aggregation behavior of 5 , and replacing H 2 O with toluene transfers the aggregates from plates to multilamellar and multicellular vesicles. In contrast, in CH 3 CN-based systems, the influence of the type of poor solvent is quite limited. Although the morphologies of the aggregates change a lot, their magnetic properties remain unchanged as confirmed by electron spin-resonance measurements.
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MACROMOLECULAR RESEARCH
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2018
·Vol. 26
·期 5
·403-409
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IF 1.767
Wang Xiaoping,Du Jianghua,Zhang Xin,Jia Deming
A mechano-chemical modification process for waste rubber powder (WRP) was investigated in this paper. 2-Mercatobenzothiozole (accelerator M) was introduced as a peptizer to improve plasticity of WRP, and 3-aminopropyltriethoxysilane (silane coupling agent KH550) was used as a surfactant to further modify the surface of plasticized rubber powder (PRP) to improve interfacial bonding with epoxidized natural rubber (ENR). Infrared spectrums showed that the WRP generated more oxygen-containing groups by mechanical forces in the presence of accelerator M and then grafted amino groups with KH550. The mechano-chemical process with accelerator M changed the structure of WRP obviously shown by sol fraction and microstructure of PRP, which increased the mechanical properties and crosslink density of full rubber powder vulcanizates. After further modified by KH550, the modified rubber powder (MRP) had a positive chemical interfacial bonding with ENR, changing the fracture surface and improving the mechanical properties of vulcanizates. The cure characteristics of the vulcanizates also illustrated that accelerator M and KH550 participated in the vulcanization process increasing the curing efficiency. The best mechanical properties of ENR/MRP vulcanizates were better than the neat ENR vulcanizates. It indicated that the mechano-chemical process with accelerator M and KH550 will be a potential method to reclaim WRP.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
·
IF 3.412
Lujia Li,Qingxue Fu,Mengxin Xia,Lei Xin,Hongyi Shen,Guowen Li,Guang Ji,Qianchao Meng,Yan Xie
Phytic acid (IP6) is a natural phosphorylated inositol, which is abundantly present in most cereal grains and seeds. This study investigated the effects of IP6 regulation on P-glycoprotein (P-gp) and its potential mechanisms using in situ and in vitro models. The effective permeability of the typical P-gp substrate rhodamine 123 (R123) in colon was significantly increased from (1.69 ± 0.22) × 10–5 cm/s in the control group to (3.39 ± 0.417) × 10–5 cm/s (p < 0.01) in the 3.5 mM IP6 group. Additionally, IP6 can concentration-dependently decrease the R123 efflux ratio in both Caco-2 and MDCK II-MDR1 cell monolayers and increase intracellular R123 accumulation in Caco-2 cells. Furthermore, IP6 noncompetitively inhibited P-gp by impacting R123 efflux kinetics. The noncompetitive inhibition of P-gp by IP6 was likely due to decreases in P-gp ATPase activity and P-gp molecular conformational changes induced by IP6. In summary, IP6 is a promising P-gp inhibitor candidate.
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RSC Advances
·
2018
·Vol. 8
·期 5
·2357-2364
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IF 2.936
Jianyun Yu,Xinxin Chen,Min Jiang,Anming Wang,Linlin Yang,Xiaolin Pei,Pengfei Zhang,Stephen Gang Wu
To develop an efficient and green immobilized biocatalyst for promiscuous catalysis which has a broad scope of applications, hybrid nanoflower (hNF) confined papain as a biocatalyst has been proposed and characterized in this study. hNFs were firstly prepared through mixing CuSO4 aqueous solution with papain in phosphate saline (PBS) at room temperature. The resulting hNFs were characterized by SEM and verified through a hydrolysis reaction with N-benzoyl-DL-arginine amide as substrate. Under optimal conditions, this nano-biocatalyst demonstrated a 15-fold hydrolytic activity compared with papain of free form, along with better thermal stability. A series of reaction factors (reaction temperature, time, and solvent) have been investigated for Knoevenagel condensation reactions with hNFs as catalyst. At optimal conditions, product yield of the hNFs catalyzed reaction was 1.3 fold higher than that of the free enzyme with benzaldehyde and acetylacetone as substrates. A few aldehydes and methylene compounds have also been used to test the generality and scope of this new enzymatic promiscuity. To sum up, the obtained hNFs demonstrate better catalytic properties than free papain and the inorganic metal-salt crystal can function as both support and promotor in biocatalysis.
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Arabian Journal of Chemistry
·
2018
·
IF 2.969
Shuai Zhang,Shoulian Wei,Hao Cheng,Wei Li
Nano-scaled Fe 3 O 4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe 3 O 4 was conducted with APTES. With Fe 3 O 4 -NH 2 and Zn 2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC) 2 @Fe 3 O 4 ) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC) 2 was almost an octahedron, and the Zn-(PDC) 2 @Fe 3 O 4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC) 2 @Fe 3 O 4 were studied with H 2 O 2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H 2 O 2 by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.411 mM, the maximum reaction rate: v max = 3.440 × 10 −8 M s −1 ; the Michaelis constant of TMB by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.189 mM, and the maximum reaction rate: v max = 2.419 × 10 −8 M s −1 , both of which were lower than those of H 2 O 2 and TMB by Fe 3 O 4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H 2 O 2 in oxidation-reduction reaction between SO 3 2− and H 2 O 2 under acid conditions, a new method for determining the content of SO 3 2− was established. The linear range of SO 3 2− was 8 × 10 −7 ∼8 × 10 −5 mol/L, the detection limit of SO 3 2− was 8 × 10 −8 mol/L, and the RSD of SO 3 2− was 2.7–9.2%.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Piaopiao Wei,Tian Gan,Kangbing Wu
Graphene nanosheets (GS) with approximately 10–15 layers was prepared via ultrasonic exfoliation of graphite powder in N -methyl-2-pyrrolidone (NMP), and confirmed using transmission electron microscopy (TEM) and atomic force microscopy (AFM). X–ray photoelectron spectra (XPS) and Raman spectra were employed to get further insights into the structural characteristics of exfoliated GS. On the surface of the GS modified glassy carbon electrode (GS/GCE), oxidation signals corresponding to carbendazim, a widely used pesticide, were greatly improved due to the higher accumulation ability, as determined by chronocoulometry. The oxidation mechanism of carbendazim was studied using a rotating disk electrode, and two electrons were transferred. Depending on the signal amplification of GS, a highly sensitive analytical platform for carbendazim was constructed. The linear range was from 1.0 to 300.0 μg L −1 (0.005–1.57 μM), and the detection limit was 0.15 μg L −1 (0.78 nM). Finally, this newly developed sensor was used to detect carbendazim in ground water, soil, and cucumber samples with satisfactory accuracy.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 20
·16814-16822
·
IF 3.201
Wei Huang,Shucheng Liu,Jinxin Liu,Wenli Zhang,Jianming Pan
A facile strategy to fabricate crown ether (2-methylol-12-crown-4, 2M12C4) immobilized porous polymers (PGMA-CE) was reported toward lithium(I) (Li+) recovery. Macroporous polymer foam (polymeric glycidyl methacrylate, PGMA) with abundant epoxy groups was firstly prepared as a support using a high internal phase emulsion (HIPE) template. And then 2M12C4 was covalently attached onto the surface of PGMA to endow the PGMA-CE with good stability and high selectivity. PGMA-CE was characterized by SEM, FT-IR, XPS, and 13C NMR spectroscopy, and its porous structure and the successful introduction of 2M12C4 were confirmed. In batch mode experiments under optimum conditions, PGMA-CE exhibited fast adsorption kinetics (the equilibrium time was 3.0 h), and the kinetics data were well described using a pseudo-second-order model. A Langmuir-type monolayer adsorption was investigated, and the calculated maximum equilibrium adsorption capacity was 3.15 mg g−1. In addition, PGMA-CE displayed excellent selectivity for Li+ in the presence of multiple interfering ions (Na+, K+, Mg+, and Ca2+), and the selective separation factors (α) were above 4.75. Regeneration analysis showed that the adsorption capacity of PGMA-CE toward Li+ after five cycles was 91.8% of the first cycle.
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CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Yanyan Guo,Chengna Dai,Zhigang Lei
We studied the hydrogenation of 2-ethylanthraquinone (eAQ) over Pd/SiO 2 /COR (COR = cordierite) monometallic and Pd-M/SiO 2 /COR (M = Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts, which were prepared by the co-impregnation method. Detailed investigations showed that the particle sizes and structures of the Pd-M (M = Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts were greatly affected by the second metal M and the mass ratio of Pd to the second metal M. By virtue of the small particle size and the strong interaction between Pd and Ni of Pd-Ni alloy, Pd-Ni bimetallic monolithic catalysts with the mass ratio of Pd/Ni = 2 achieved the highest H 2 O 2 yield (7.5 g/L) and selectivity (95.3%). Moreover, density functional theory calculations were performed for eAQ adsorption to gain a better mechanistic understanding of the molecule-surface interactions between eAQ and the Pd(1 1 1) or PdM(1 1 1) (M = Ni, Fe, Mn, and Cu) surfaces. It was found that the high activity of the bimetallic Pd-Ni catalyst was a result of strong chemisorption between Pd 3 Ni 1 (1 1 1) and the carbonyl group of eAQ.
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