ADVANCED POWDER TECHNOLOGY
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2014
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IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
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IF 2.045
Lingzong Meng,Dan Li,Tianlong Deng,Yafei Guo,Cunyun Ma,Youcai Zhu
The solubilities and refractive indices of the NaBr–CaBr2–H2O system at 288.15 K were determined using the isothermal equilibrium solution method. The phase diagram and refractive index diagram were drawn for this system at 288.15 K. The system belongs to the hydrate II type. The phase diagram is comprised of two invariant solubility points, three univariant solubility curves, and three areas of crystallization: NaBr·2H2O, NaBr and CaBr2·6H2O. Using the temperature-dependent formulas from the literature, the Pitzer parameters and the solubility product constants (ln Ksp) of NaBr·2H2O and NaBr were determined. Applying the Pitzer and Harvie–Weare (HW) model, the solubility product constant of CaBr2·6H2O was fit with the solubilities in this research work, and then, the mean activity coefficients of sodium bromide and calcium bromide and the solubilities for the ternary system at 288.15 K were demonstrated. Comparisons between the calculated and measured solubilities show that the predicted data have good accordance with the experimental results.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Jiayi Chen,Lingxiao Chen,Yingjie Xu
Densities and viscosities of the pure ionic liquid 1,1,3,3-tetramethylguanidine imidazole ([TMG]IM) and its binary mixtures with methanol, ethanol, 1-propanol, and 1-butanol were measured at temperatures from T = (293.15 to 313.15) K. The thermal expansion coefficient, molecular volume, standard entropy, and lattice energy of [TMG]IM were obtained from the experimental density value. The temperature dependence of the viscosity of [TMG]IM was fitted to the fluidity equation. Excess molar volumes V E and viscosity deviations Δ η of the binary mixtures were calculated and fitted to the Redlich–Kister equation with satisfactory results. The result shows that the V E values of the binary mixtures are negative over the whole composition range, while Δ η values have an S-shape deviation. Temperature has little effect on the V E of the systems, but it has significant effect on the Δ η . Furthermore, the absolute values of V E for {[TMG]IM (1) + alcohol (2)} systems at the same temperature decrease with increasing carbon alkyl chain of the primary alcohol. Other derived properties, such as the apparent molar volumes, partial molar volumes, excess partial molar volumes, Gibbs free energy of activation for viscous flow, and excess Gibbs free energy of activation for viscous flow of the above-mentioned systems were also calculated.
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FLUID PHASE EQUILIBRIA
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2015
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IF 2.2
Yang Feng,Entao Yang,Leping Dang,Hongyuan Wei
Liquid–liquid phase equilibrium data for ternary systems containing formamide (or ethylene glycol (EG), monoethanolamine (MEA) + indole + 2-methylnaphthalene (2-MN) at 308.15 K under atmospheric pressure were measured in this work. The results show that all the three ternary systems are Treyball type 1 systems. The experimental data were correlated well using both the non-random two liquid (NRTL) model and universal quasi-chemical activity coefficient (UNIQUAC) model. In addition, both the distribution coefficient and selectivity coefficient of formamide, EG and MEA were calculated to investigate the feasibility of extracting indole from 2-MN and formamide presented a better selectivity.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Peipei Zhu,Yanxin Chen,Meijing Zhang,Ying Bao,Chuang Xie,Baohong Hou,Junbo Gong,Wei Chen
In this work, the solubility of 1,3-dimethylurea form I (DMUI) in seven solvents including water, 2-butanol, 2-propanol, acetone, acetonitrile, ethyl acetate and butyl acetate were measured by a synthetic method at a temperature range from (288.15 to 328.15) K at atmospheric pressure. For the temperature range investigated, the solubility of DMUI in the selected solvents increased with increasing temperature. Results of these measurements were well-correlated with the modified Apelblat equation, λh equation, van’t Hoff equation and Wilson model. Besides, the thermodynamic data ( i.e. , Gibbs energy, enthalpy, and entropy of mixing) were calculated by using the Wilson model. The chemical potential, solvation free energy and interaction enthalpy of DMU in solution were calculated by COSMO-RS model. This model was also applied to predict DMU solubility which showed good agreement with the experimental values.
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Asia-Pacific Journal of Chemical Engineering
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2016
·Vol. 11
·期 2
·305-313
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IF 0.728
Xing Li,Lei Bei,Zhi Sun,Kun Liu,Xu Zhang,Xiaozhao Han
The study aimed at investigating the addition effects of P, K, and micronutrient fertilizers on the permeability of N-nutrient fertilizer urea through a representative polymer membrane, which is of great importance in polymer-coated compound fertilizer. Specifically, the permeability of urea through polystyrene membrane was determined experimentally at the nominal temperature of 298 K using the Ussing chamber method for fertilizer solutions of urea–water, urea–NaH 2 PO 4 –water, urea–Ca(H 2 PO 4 ) 2 –water, urea–KCl–water, and urea–NaCl–water. The experimental data showed that the addition effects of NaH 2 PO 4 , KCl, and NaCl on urea permeability were pronounced and could be promotion or suppression depending on the amounts added. The variation of urea permeability with additive concentration could be explained by the ‘solution–diffusion’ model, suggesting that the specific intermolecular and interionic interactions in the permeation solution were an important factor determining the permeability. Using the saturated urea–water solution as basis, the addition of saturated KCl increased the urea permeability by 2.5 times, while the addition of saturated Ca(H 2 PO 4 ) 2 and NaH 2 PO 4 decreased the permeability by 41% and 76%, respectively. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.
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FLUID PHASE EQUILIBRIA
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2016
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IF 1.846
Yemin Yu,Tao Li,Yonghong Hu,Wenge Yang,Yuhao zhang,Renlun Deng,Min Jiang
Research on relevant solid–liquid equilibrium of drug Norfloxacin (NFLX) in different solvents is necessary for an elementary study of industrial implantation. In this work, the solid–liquid equilibrium of NFLX in ethanol, 1-butanol, isopropanol, acetone, acetonitrile , ethyl acetate , N-hexane, N,N-dimethylformamide single pure solvent and in (N,N-dimethylformamide + ethyl acetate) binary solvent mixtures were probed under atmosphere pressure at desired temperatures from 278.15 K to 328.15 K. The Gibbs energy , enthalpy, and entropy of solution were obtained from these solubility data. The modified Apelblat model, the Buchowski–Ksiazaczak λh model, Redich-Kister (CNIBS/R-K) model, Jouyban-Acree model, ideal model and the Van't Hoff analysis were applied to depict and forecast the diversification tendency of solubility. The satisfactory simulation results were obtained. Moreover, the thermodynamic functions for NFLX dissolution from calculation, using the van't Hoff and Gibbs equations, imply that in each studied solvent and in binary solvent mixtures, the process of NFLX dissolution is endothermic. Based on the above analysis, N,N-dimethylformamide is checked as the best solvent and ethyl acetate can be used as an effective anti-solvent in the crystallization process of NFLX.
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ANALYTICAL CHEMISTRY
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2017
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IF 6.32
Lu Li,Yuanyuan Fan,Qingling Li,Renjie Sheng,Haibin Si,Juan Fang,Lili Tong,Bo Tang
Various intracellular metal ions have closely related functional roles in the nervous system. An excess or deficiency of essential metal ions can contribute to neurodegenerative diseases. Thus, the detection of various metal ions in neurons is important for diagnosing and monitoring these diseases. In particular, single-cell analysis of multiple metal ions allows us to not only understand the cellular heterogeneity and differentiation but also determine the actual relationships among multiple metal ions in each individual cell. Aiming at the low efficient single-cell manipulation and interference of complex biological matrices within cells in the existing method for single-cell metal ion detection, in this manuscript, we present a convenient, sensitive, and reliable method to simultaneously identify and quantify multiple metal ions at the single-cell level using a microfluidic system. Using the combination of on-chip electrophoresis separation and multicolor fluorescence detection, we achieved the simultaneous analysis of Na+, K+, Ca2+, and Mg2+ in single PC-12 cells and studied changes in these four metal ions in Aβ25–35-treated PC-12 cells, which is a model of Alzheimer’s disease (AD). The data showed that metal ions imbalances in neuron-like cells may be associated with AD induced by Aβ25–35. This method paves the way for multiple metal ion detection in single neuron-like cells, and the results provide insights regarding synergistic function of multiple metal ions in regulation of neurological diseases at the single-cell level.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
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IF 2.323
Shenfeng Yuan,Jiafeng Liu,Hong Yin,Zhirong Chen
Liquid–liquid equilibrium (LLE) data for the quaternary systems of ethanol + butanol + octane + water and ethanol + butanol + nonane + water were obtained at 298.15 K under atmospheric pressure in this article. The nonrandom two-liquid (NRTL) equation was used to correlate the LLE data, and the two quaternary systems were used to regress the interaction parameters of the model. The obtained interaction parameters of NRTL model were used to predict the LLE of the quinary system ethanol + butanol + octane + nonane + water and was compared with the experimental values. The results showed that the calculated values coincided with the experimental data well, an indication that the NRTL model and the interaction parameters obtained from quaternary systems could be used to predict the LLE data of quinary system. The LLE data of the quinary system were also characterized by the distribution coefficient and the selectivity, and the results showed that the ethanol aqueous solution which contained about 40 wt % ethanol was suitable for separating butanol from the butanol–octane–nonane mixture.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Lina Wang,Hanpei Yang,Qiangshun Wu,Rui Ma
Photocatalysis-self-Fenton system, integrating photocatalysis with Fenton technology, emerge as promising approaches for environmental remediation. In this study, we introduced K, Na doped g-C 3 N 4 /FeOCl (DCN/FeOCl) catalyst, where amino groups on the DCN surface interacted with unsaturated Fe on FeOCl, forming Fe–N bonds and a Z-scheme heterojunction . The resulting DCN/FeOCl demonstrated efficient H 2 O 2 production and rapid tetracycline (TC) degradation under visible light. The Z-scheme heterojunction and nitrogen vacancy enhanced electron-hole pair separation and O 2 adsorption. Additionally, we proposed a mechanism for dual-channel photocatalytic H 2 O 2 production. This work presents a novel strategy for in-situ H 2 O 2 production and activation, facilitating water decontamination .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhangwei Sun,Yuhao Qi,Kaile Wang,Jiaming Li,Xiaoyu Qiu,Yunhe Zhao,Li Guo
In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C 3 N 4 (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C 3 N 4 , surpassing most reported g-C 3 N 4 -based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C 3 N 4 , which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.
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Biomass Conversion and Biorefinery
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2024
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IF 3.5
Yao Pin,Yan Tinggui,Dai Xin,Xiao Ya,Xiang Weixue,Wu Yunqi
Deposition and corrosion in boilers caused by the release of alkali compounds in agricultural residua pose significant challenges to the widespread utilization of biomass energy. Phosphate tailings (PT), which is rich in Ca, Mg, and P, have the potential to mitigate the potassium (K) release of biomass straw. However, the impact of PT on K immigration has not been investigated. To elucidate the influence of PT on K immigration, thermal analysis, K concentration determination, and mineral evolution during heating of ash were conducted. These results were compared with those obtained from biomass mixed with kaolin, an effective additive known to alleviate K release in biomass. The findings revealed that PT resulted in lower K release at temperatures below 600 ℃ compared to kaolin. Because the reaction between PT and K-compounds to form K-phosphate occurs more readily than the formation of K-silicate at lower temperatures. However, the effectiveness of PT diminished as the temperature increased. One reason is the decomposition of K-phosphate, resulting in the volatilization of K at higher temperatures. Another reason is the competition among Ca, Mg, and K for the opportunity to react with Si and Al, leading to the formation of more stable Ca and Mg aluminosilicate and facilitating the release of K. It is noteworthy that the addition of kaolin to rice straw causes a violent release of K in 1000–1200 ℃. This can be attributed to the surplus of Si in the system, promoting the release after the eutectic melting between K-silicate and SiO 2 .
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