JOURNAL OF RARE EARTHS
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2012
·
IF 0.901
Xiaoming PENG,Yufeng HU,Chuanwei JIN,Zhixin WANG,Chao MIAO,Zheyu LI
Viscosities were measured for the ternary systems Y(NO 3 ) 3 +La(NO 3 ) 3 +H 2 O, La(NO 3 ) 3 +Ce(NO 3 ) 3 +H 2 O, and La(NO 3 ) 3 +Nd(NO 3 ) 3 + H 2 O and their binary subsystems Y(NO 3 ) 3 +H 2 O, La(NO 3 ) 3 +H 2 O, Ce(NO 3 ) 3 +H 2 O, and Nd(NO 3 ) 3 +H 2 O at 293.15, 298.15 and 308.15 K. The results were used to test the applicability of simple equations for the viscosity of the mixed solutions. The predictions agreed well with measured values, implying that the viscosities of the examined electrolyte solutions could be related to those of their constituent binary solutions using these simple equations.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Li Xu,Qiye Ju,Haiyan Jiang,Na Geng,Jianze Xiao,Ziqian Xue,Tingyu Zhu,Yangyang Guo
Heavy water (D 2 O) electrolysis is the primary technology for D 2 production, playing an irreplaceable role in fields such as nuclear fusion research and isotope tracing. However, the inherent similarity in chemical properties between H 2 O and D 2 O (with only a 1.4 °C difference in boiling points) poses significant challenges to their separation. Furthermore, the extremely low natural abundance of D 2 O (0.015 %) increases the difficulty and cost of separation, while traditional electrolysis and distillation techniques are highly energy intensive. Therefore, there is an urgent need to develop novel adsorbents for efficient and environmentally sustainable H 2 O/D 2 O separation. Herein, we used polydentate ligand 2, 5-dihydroxyterephthalic acid (DOBDC) and its derivatives 4,4́-(anthracene-9,10-diyl) bis (2-hydroxybenzoic acid (ABHB) as raw materials to prepare two novel high coordination Sr-MOFs namely IPE-1 and IPE-2, respectively. These MOFs were applied for efficient separation of H 2 O and D 2 O at room temperature. X-ray diffraction results reveal that one Sr atom in IPE-1 is coordinated with 9 oxygen atoms. This high coordination number results in the formation of ultra-small rectangular pores of approximately 2.5 Å. Adsorption isotherms of N 2 , CO 2 , H 2 O, and D 2 O indicate that the ultramicroporous structure of IPE-1 precludes efficient diffusion of CO 2 and H 2 O molecules into the MOF channels. In contrast, the activated IPE-2 exhibits good CO 2 , H 2 O, and D 2 O uptake capacities of 3 mmol/g, 8.38 mmol/g, and 6.51 mmol/g at 298 K, respectively. The Q st values and K sap values of H 2 O and D 2 O indicate that the adsorption rates of H 2 O were much higher than D 2 O under 0.2 < P/P 0 < 0.7, with a calculated ratio of approximately 1.26. This study not only provides appealing MOFs materials for efficient H 2 O/D 2 O separation at room temperature but also provides a new avenue for preparing adsorbents with high stability and high separation performance.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) phase equilibrium of the ternary system (NaCl + RbCl + H 2 O) at T = (288.15, 298.15 and 308.15) K was studied by the method of isothermal solution saturation. Moreover, the density and refractive index of the solution was also determined. The solid phase was studied by the Schreinemaker’s wet residue method and verified by X-ray diffraction. The results show that each of the phase diagrams contains one invariant point, two univariant curves, and three crystallization regions. The crystallization region of NaCl increased obviously with the temperature increasing, while the crystallization regions of RbCl and the mixed crystallization region of (NaCl + RbCl) decreased a little. Furthermore, there are break points at the invariant points for density and refractive index curves.
研究领域:
化学
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材料科学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
Complete phase diagrams and physico-chemical properties for the ternary system (CsCl + NaCl + H2O) were determined at T = (298.15, 308.15, and 318.15) K, respectively. The X-ray diffraction method and Schreinemaker’s wet residue method were used to verify the solid phase. The phase diagrams show this ternary system is a complex type. Three crystallization regions were found corresponding to the single salt NaCl, a compound CsCl·2NaCl·2H2O, and a solid solution series [Cs1–x(Na·H2O)x]Cl (x in [Cs1–x(Na·H2O)x]Cl changed from 0 to 0.43 (298.15 K), 0.39 (308.15 K), and 0.36 (318.15 K) at each temperature. With rising temperature, the crystallization area of NaCl increased, but CsCl·2NaCl·2H2O and [Cs1–x(Na·H2O)x]Cl decreased simultaneously. However, density and refractive index increased with increasing CsCl concentration.
研究领域:
化学
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物理化学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
Solubility isotherms of the ternary NaCl + RbCl + H2O system were elaborately determined at T = (273.15 and 298.15) K by an isothermal equilibrium method, and the results showed that there are only two solubility branches for the solid phase NaCl(cr) and RbCl(cr) at both temperatures. The liquid composition of invariant points at T = (263.15, 323.15, 338.15, and 348.15) K were also determined. The experimental data at T = 298.15 K were reproduced using a Pitzer–Simonson–Clegg activity model by adding a temperature independent ternary mixing parameter. Then, the solid–liquid equilibria in the ternary NaCl + RbCl + H2O system were predicted from the available binary parameters obtained in our previous study and the mixing parameter regressed at 298.15 K in this study. The model was further validated by comparing the predictions with the present data at other temperatures that were not used in parametrization. Finally, the phase diagram of the ternary NaCl + RbCl + H2O system in the temperature range from the lowest eutectic point to 373.15 K was constructed to lay the foundation for equilibria property predictions for more complex Rb-containing systems.
研究领域:
物理化学
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热力学
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材料科学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2024
·
IF 2
Honglin Xu,Yongsheng Deng,Xinyu Wang,Ruilin Wang
The stable phase equilibrium of the ternary system NaVO3–KVO3–H2O at 298.15 K was investigated using the isothermal solution equilibrium method and the Schreinemaker wet residue method. The equilibrium liquid phase solubility data and physical property data [density (ρ), refractive index (nD), pH] were determined, and X-ray diffraction was utilized to verify the material composition of the equilibrium solid phase. Phase diagrams and physical property–composition diagrams were constructed based on the equilibrium solubility data and physical property data. The results show that the ternary system has a complex salt generation process with two invariant points, three univariate curves, and three crystalline phase regions corresponding to NaVO3·2H2O, KVO3, and Na2mKn(VO3)2m+n, respectively. The solid phase precipitated from a saturated NaVO3 solution at 298.15 K is NaVO3·2H2O, as confirmed by a comparison of experimental results and the literature. The chemical composition of the complex salt generated from the NaVO3–KVO3–H2O ternary system follows the general formula of the Na2mKn(VO3)2m+n complex salt proposed by Druzynski’s group, thereby validating the reliability of the present experiment. This study provides new experimental data for the preparation and separation of metavanadate.
研究领域:
化学热力学
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材料科学
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
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IF 2.235
Jiahe Yan,Yucui Hou,Shuhang Ren,Muge Niu,Weize Wu
Because of its controllable and recoverable properties, the H2O–SO2 system was studied as a reaction medium to hydrolyze corn cob to produce chemicals by a two-step treatment. The results indicated that, after the first-step treatment of corn cob, 27.0% xylose, 3.3% glucose, and 3.2% arabinose could be obtained at 140 °C for 1.5 h with 0.024 g/cm3 SO2; after the second-step treatment, 8.6% glucose could be obtained at 190 °C for 0.5 h with 0.048 g/cm3 SO2. The total yield of products by the two-step treatment of corn cob was 48.4%, which was greater than that obtained by the one-step treatment, 32.4% at 190 °C for 0.5 h with 0.048 g/cm3 SO2. Furthermore, the degradation products obtained from the two-step treatment were less than those obtained from the one-step treatment. More importantly, after the reaction, SO2 could be swept by stream stripping and reused.
研究领域:
生物化学
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可再生资源利用
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高影响因子
JOURNAL OF SOLUTION CHEMISTRY
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2018
·Vol. 48
·期 3
·367-378
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IF 1.401
Li Hongxia,Guo Lijiang,Li Jianqiang
The water activities of the MgCl 2 –RbCl–H 2 O ternary system and its sub-binary systems have been measured with the isopiestic method at 323.15 K. The measured water activities for the MgCl 2 –H 2 O and RbCl–H 2 O sub-binary systems agree well with the results reported in literature. The measured equal water activity lines of the MgCl 2 –RbCl–H 2 O ternary system are not straight lines, which means the mixing behavior of the solutions do not obey Zdanovskii’s rule. The solubility of the MgCl 2 –RbCl–H 2 O ternary system has been determined with the Flow-Cloud-Point method at 323.15 K, and the measured results are roughly consistent with values reported in the literature. The Pitzer model was selected to correlate the water activity and solubility data measured in this work. The predicted water activities and solubility isotherm for the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K, with binary solution parameters only, both deviated from the experiment values. The ternary solution Pitzer model parameters were obtained by fitting the measured water activities in the ternary system. The water activities and solubility isotherms of the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K were calculated including both binary and ternary solution parameters. The calculated water activities are consistent with the experimental values. The calculated solubility isotherms are roughly consistent with experiment values, except they deviate somewhat in the RbCl crystallization region.
研究领域:
化学
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物理化学
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·11010-11016
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IF 6.4
Fan Chen,Xiao-Jun Wang,Wenhao Bai,Xuehu Zhang,Wen Hao,Changhua Zhang,Tongtong Xuan
Zero-dimensional (0D) lead-free halide perovskites are emerging as promising light-emitters, which can be applied as light conversion materials for illumination and display. Herein, we prepared a series of Sb3+:Rb2InCl5·H2O perovskites by a simple and efficient coprecipitation method. The Rb2InCl5·H2O perovskite gives no emission due to the parity-forbidden transition. When Sb3+ is doped into Rb2InCl5·H2O, radiative transition occurs. Under 365 nm excitation, the Sb3+:Rb2InCl5·H2O perovskites show an intense orange-red emission peak at 615 nm, ascribed to the 3P1 to 1S0 transition of Sb3+. The brightest luminescence of Sb3+:Rb2InCl5·H2O was achieved by doping 40%Sb3+, with a high photoluminescence quantum yield (PLQY) of 62.1% and an external quantum efficiency (EQE) of 30.2%. Furthermore, the prepared Sb3+:Rb2InCl5·H2O perovskite exhibits a distinguished thermal stability. At 150 °C, its PL intensity remains 68% of that measured at room temperature, with a high thermal activation energy of 0.184 eV. By combining Sb3+:Rb2InCl5·H2O with a blue-emitting Eu2+:BaMgAl10O17 (Eu2+:BAM) phosphor, bright warm-white light with a color rendering index of 88 and a correlated color temperature of 3242 K was achieved. To sum up, the prepared Sb3+:Rb2InCl5·H2O orange-red perovskites have the advantages of suitable excitation and emission peak positions, high emission intensity, high PLQY and EQE, excellent stability, and environmental friendliness, making them very attractive in the field of lighting and displays.
研究领域:
材料科学
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光学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
·
IF 2.6
Chang-Wei Peng,Rui-Zhi Cui,Shi-Hua Sang,Hong-Bao Ren
According to the composition characteristics of mineral elements in underground brine in the Sichuan basin of China, the complete phase equilibria and phase diagram of the quinary system LiBr–NaBr–KBr–MgBr2–H2O were studied at 298.15 K. Using the experimentally determined solubilities and equilibrium solids, the spatial stereo phase diagram of the quinary system, the dry base projection phase diagrams of the saturated surfaces of the four salts MgBr2·6H2O, KBr, LiBr·2H2O, and NaBr·2H2O, and the corresponding water content diagrams were plotted, respectively. The experimental results show that at 298.15 K, in addition to the four original components, the anhydrous salt NaBr and the double salt KBr·MgBr2·6H2O are formed. The phase diagram of the quinary system at 298.15 K contains 10 univariate curves, three invariant points, and six equilibrium solid-phase crystallization regions (KBr crystallization region, NaBr crystallization region, NaBr·2H2O crystallization region, MgBr2·6H2O crystallization region, LiBr·2H2O crystallization region, KBr·MgBr2·6H2O crystallization region). When MgBr2·6H2O or KBr is saturated, LiBr has a strong salting-out effect on KBr, NaBr, or MgBr2 and NaBr, while when LiBr·2H2O is saturated, MgBr2 has a salting-out effect on KBr and NaBr. All four saturated projection surfaces have MgBr2·6H2O, and NaBr is generated. These phase equilibrium data can provide a theoretical basis to guide underground brine mining and extract useful components.
研究领域:
化学
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材料科学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Zhan-Ping Qiao,Xin Chen,Qi-Chao Yang
Using an isothermal equilibrium method, the phase equilibrium of the ternary systems CsCl–CdCl 2 –H 2 O and CsBr–CdBr 2 –H 2 O were studied at T = 298.1 K. In the phase diagram of the system CsCl–CdCl 2 –H 2 O, the solid phases of CsCdCl 3 and Cs 2 CdCl 4 , besides CsCl and CdCl 2 ·2.5H 2 O, were discovered. The phase diagram of the system CsBr–CdBr 2 –H 2 O contains five crystallization fields for the solid phases CdBr 2 ·4H 2 O, CsCdBr 3 , Cs 5 Cd 2 Br 9 , Cs 3 CdBr 5 and CsBr. The new solid phases of CsCdCl 3 and CsCdBr 3 are congruently soluble, and Cs 2 CdCl 4 , Cs 5 Cd 2 Br 9 and Cs 3 CdBr 5 are incongruently soluble in the aqueous system. The experimental solubility data and phase diagram s for the ternary systems show more practical application for the obtained cadmium-based halide perovskite. The five new solid phase have been analyzed by X-ray diffraction and thermogravimetry/derivative thermogravimetry. By measuring the standard molar enthalpies of solution of the compounds, the standard molar enthalpies of formation of CsCdCl 3 , Cs 2 CdCl 4 , CsCdBr 3 , Cs 5 Cd 2 Br 9 , Cs 3 CdBr 5 were determined to be –(873.3 ± 0.7) kJ·mol −1 , –(1325.6 ± 0.9) kJ·mol −1 , –(742.8 ± 0.7) kJ·mol −1 , –(2710.0 ± 1.3) kJ·mol −1 and –(1558.1 ± 1.0) kJ·mol −1 , respectively.
研究领域:
物理化学
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材料科学
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热力学
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Na Zhang,Anxin Liu,Ling Chen,Xiangyu Xue,Hongfa Yu,Mingfang Ba
This study systematically investigated the hydration process and phase evolution of MgO-MgSO₄-H₂O (M-M-H) systems with and without chemical additive at different hydration stages using X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), hydration heat measurement, and microstructural characterization. The results demonstrate that the formation of magnesium oxysulfate cement (MOSc) product phases is intrinsically governed by Mg²⁺ concentration in the liquid phase, which is co-regulated by both raw material molar ratios and phase regions. At low Mg²⁺ concentrations, the primary hydration products in chemical additive-free MOSc are 3Mg(OH)₂·MgSO₄·8H₂O (3–1–8 phase) and Mg(OH)₂. When Mg²⁺ concentration reaches a critical threshold, 5Mg(OH)₂·MgSO₄·7H₂O (5–1–7 phase) additionally forms in the system. Chemical additive significantly alter the hydration process by enhancing Mg²⁺ concentration and promoting MgO particle participation, ultimately shifting the dominant product phases to 5–1–7 and Mg(OH)₂. These findings provide deeper mechanistic understanding of hydration reactions in M-M-H systems and offer important guidelines for research and applications of chemically modified MOSc.
研究领域:
材料科学
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化学工程
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高影响因子
危险品化学品经营许可证（带存储）