JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Yajun Li,Xiaofang Li,Kui Wu
In this work, the solubility of N,N-dibenzylhydroxylamine (DBHA) in 17 pure solvents, including methanol, ethanol, n-propanol, n-butanol, acetone, ethyl acetate, dichloromethane, acetonitrile, isopropanol, n-octanol, cyclohexanone, 1,2-dichlorobenzene, toluene, isobutanol, n-pentanol, 1,2,4-trichlorobenzene, and tetrahydrofuran, was determined by a static gravimetric method with the temperature ranging from 273.15 to 323.35 K under atmospheric pressure. The solubility of DBHA was positively related to temperature in all selected solvents. Besides, the experimental solubility data were correlated with four thermodynamic models, i.e., the modified Apelblat equation, λh equation, nonrandom two-liquid (NRTL) equation, and the Wilson equation. The results indicated that all of the models could give satisfactory results and the NRTL equation provided the best fitting result. Furthermore, the dissolution thermodynamic parameters in the used solvents, including the Gibbs energy (ΔdisG), molar enthalpy (ΔdisH), and molar entropy (ΔdisS), were calculated according to the Wilson model, and it turned out that the dissolution process of DBHA was endothermic.
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高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 5
·2762-2770
·
IF 6.852
Zehui Zhang,Bing Liu,Kangle Lv,Jie Sun,Kejan Deng
In this study, we have successfully prepared a heterogeneous catalyst (K-10 clay-Mo) by the immobilization of bis(acetylacetonato) dioxo-molybdenum(VI) [MoO2(acac)2] on montmorillonite K-10 clay. The structure of the resultant catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electronic microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. The catalytic activity of K-10 clay-Mo was tested in the aerobic oxidation of 5-hydroxymethylfurfural (HMF). Although a molecule of HMF contains one hydroxyl group and one aldehyde group, to our surprise, the catalyst showed high catalytic activity for the oxidation of the aldehyde group of HMF into 5-hydroxymethyl-2-furancarboxylic acid (HMFCA). A variety of important reaction parameters such as the reaction temperature, catalyst amount, and solvent were explored. HMFCA could be obtained in a high yield of 86.9% with a HMF conversion of 100% after a short reaction time of 3 h in toluene. More importantly, the catalyst K-10 clay-Mo could be reused several times without a significant loss of its catalytic activity.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
·
IF 2.037
Xiong Zheng,Ying Zhang,Maogang He
The speed of sound in hexane and heptane (mass purity > 0.990, GC) was measured using the Brillouin light scattering method at T = (300.15 to 506.15) K for hexane, (302.15 to 536.15) K for heptane), and p = (1.0 to 8.5) MPa, including saturated liquid, saturated vapor, and compressed liquid. The expanded relative uncertainty (k = 2) of the speed of sound was estimated to be less than 1.0% over the whole investigated range of states. Polynomial representations for the speed of sound in hexane and heptane were fitted to the experimental results. A comparison of the speed of sound data with the correlation shows that, for hexane, the AAD is 0.67% for the saturated liquid, 0.36% for the saturated vapor and 0.57% for the compressed liquid respectively, and for heptane, the AAD is 0.46% for the saturated liquid, 0.38% for the saturated vapor and 0.41% for the compressed liquid, respectively.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Dongren Cai,Jinbei Yang,Hairong Da,Ling Li,Hongxing Wang,Ting Qiu
Densities, ρ and viscosities, η of N , N -dimethyl-N-(3-sulfopropyl)cyclohexylammo-nium tosylate ([CyN 1,1 PrSO 3 H][Tos]) with water and methanol were measured, at temperatures from 303.15 K to 328.15 K with 5 K interval and 0.1013 MPa, as a function of [CyN 1,1 PrSO 3 H][Tos] molality (or mass fraction). The isobaric thermal expansion coefficient , molecular volume, standard molar entropy, and lattice energy of the pure IL were obtained based on the density data of pure IL . The apparent molar volume , V φ , infinite dilution apparent molar expansibility, E φ ∞ and energy barrier, E were calculated from the experimental data. The Redlich-Mayer equation was used to evaluate infinite dilution apparent molar volume , V φ ∞ . In addition, viscosities can be described satisfactorily by Vogel-Fulcher-Tammann (VFT) equation. The V φ ∞ values of the IL in water are higher than those in methanol, which suggests that the ion-solvent interactions for [CyN 1,1 PrSO 3 H][Tos] + water binary system are stronger than those for [CyN 1,1 PrSO 3 H][Tos] + methanol. And the energy barrier values decrease with the drop of IL mass fraction in both systems, indicating that the viscosity changes of binary mixtures are more sensitive to the temperature at high composition of the IL.
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高影响因子
APPLIED GEOCHEMISTRY
·
2017
·
IF 2.581
Wei Zhang,Li Zhou,Hongfeng Tang,Heping Li,Wenlei Song,Gang Xie
The solubility of fluorite in hydrothermal conditions is important in ore forming and geothermal processes and groundwater utilization. However, a quantitative description of the geochemical behavior of fluorite under hydrothermal conditions has not been previously reported. In this work, the solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 M was determined by experiments and modeling. The solubility products obtained in this work at 30 and 50 °C under ambient pressure and those from literature were used to regress the density model parameters for fluorite solubility product calculation at high temperature. The Pitzer interaction model was adopted to calculate the activity coefficient . The fluorite solubility determined in KCl solution at 250 °C under vapor saturated pressure and that from the literature were combined with the low-temperature thermodynamic properties of heat capacity and osmotic coefficient to obtain the binary parameters of NaF and KF at temperatures up to 260 °C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 °C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 °C and 0.1 M NaCl was well predicted. Both temperature and ionic strength had significant effects on fluorite solubility, and fluorite exhibited a similar dissolution pattern in both NaCl and KCl solution. When the concentration was lower than 2 M, the solubility of fluorite first increased with temperature, reached a maximum at approximately 100 °C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Hongzhou Lian,Qingming Huang,Yeqing Chen,Kai Li,Sisi Liang,Mengmeng Shang,Manman Liu,Jun Lin
Narrow band red-emitting A2GeF6:Mn4+ (A = Na, K, Rb, Cs) phosphors were prepared through a two-step precipitation–cation exchange route using a K2MnF6 precursor as the Mn4+ source. The phase purity, morphology, and constituent were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectric spectroscopy (XPS), and electron paramagnetic resonance (EPR) examination. Optical properties were investigated by photoluminescence spectra (PL and PLE) and high-resolution PL. A temperature-dependent PL examination was performed to investigate the electron–phonon coupling emission mechanism of Mn4+ in these alkali fluorogermanates. The PL data show that both ordered distribution and appropriate distance between Mn4+ ions are propitious for enhancement of the emission intensity. A resonance emission enhancement (REE) mechanism has been proposed to explain the intensity increment among these products. These phosphors present bright red emission under blue light (467 nm) illumination, among which Cs2GeF6:0.03Mn4+ exhibits the most excellent optical properties with a quantum yield (QY) of 93%. A WLED (white light-emitting diode) fabricated with blend of commercial YAG:Ce3+ and this phosphor emits intense warm white light with low color temperature (CCT = 3385 K) and high color rendering index (Ra = 90.5), implying its potential application as red phosphor in WLEDs.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Xiaojun He,Ze Tan,Qinbo Wang,Yinchuan Pei
Mononitro-substituted products derived from the nitration of m-toluic acid are 3-methyl-4-nitrobenzoic acid, 3-methyl-2-nitrobenzoic acid, and 5-methyl-2-nitrobenzoic acid, which are all crucial intermediates of pesticides and medicines. The solubilities of 3-methyl-4-nitrobenzoic acid, 3-methyl-2-nitrobenzoic acid, and 5-methyl-2-nitrobenzoic acid in water, methanol, ethanol, n-propanol, formic acid, acetic acid, and propanoic acid were measured at different temperatures (297.65–351.75 K) and under atmospheric pressure. As expected, the same solute has different solubilities in different solvents, and the dissolved amounts of these three solutes are also diverse in the same solvent. Subsequently the experimental solubility data of three mononitro-substituted products of m-toluic acid nitration in several solvents were correlated with the modified Apelblat equation and the NRTL activity coefficient model, and the calculated values are in excellent agreement with known experimental data in the temperature range studied.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wen Lu,Aimin Wang,Yanyu Zhang,Songyu Ren,Zhongguo Zhang
In this work, an innovative strategy combining vacuum ultraviolet (VUV) and K doping graphite carbon nitride (K-g-C 3 N 4 ) was proposed for antibiotic removal in aqueous. The properties of K-g-C 3 N 4 were systematically characterized by XRD, FT-IR, BET, SEM, UV-vis DRS, and XPS, showing that K-g-C 3 N 4 possessed a larger specific surface and richer functional groups than g-C 3 N 4 . The catalytic efficiency of K-g-C 3 N 4 was investigated for the trimethoprim (TMP) removal under VUV irradiation. Compared with UVC photolysis, VUV photolysis, UVC/g-C 3 N 4 , VUV/g-C 3 N 4 , and UVC/K-g-C 3 N 4 processes, VUV/K-g-C 3 N 4 enhanced the pseudo-first-order reaction rate constant of TMP removal by 2.0–19.7 times and the mineralization rate by 9.0%-38.2%. Electron paramagnetic resonance results and quenching experiments validated that O 2 •- , • OH, 1 O 2 , h + , and e - were engaged in the VUV/K-g-C 3 N 4 process. The fluorescent spectra of O 2 •- -substituted and • OH-substituted products revealed that the K-g-C 3 N 4 greatly enhanced the quantity of O 2 •- and • OH during VUV irradiation. The VUV/K-g-C 3 N 4 system produced marginally more H 2 O 2 and • OH than the UVC/K-g-C 3 N 4 system, confirming that K-g-C 3 N 4 predominantly utilized the UVC and other ultraviolet–visible light emitted by the VUV lamp, with VUV having a minor effect. Furthermore, K-g-C 3 N 4 had exceptional stability and reusability, efficiently degrading various contaminants under VUV irradiation. This work offered a comprehensive insight into VUV/K-g-C 3 N 4 process as a novel approach for antibiotic removal from water.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Yi Hua,Jinqiu Ma,Shuaiqi Sun,Qingfen Meng,Dan Li,Yong Ma,Lingzong Meng,Guangli Zhou
The water activities and osmotic coefficients in the ternary system NaB(OH)4–Na2B4O5(OH)4–H2O at 323.15 K were investigated with the isopiestic method. The solubilities and physicochemical properties in the NaBO2–Na2B4O7–H2O system at 323.15 K were studied with the isothermal dissolution equilibrium method. The phase diagram in the system consists of two single salt regions for NaBO2·4H2O and Na2B4O7·10H2O, one invariant point saturated with the above salts, and two univariant solubility curves. On the basis of the Pitzer model, the Pitzer binary parameters of Na2B4O5(OH)4 and mixing parameters were fitted with the osmotic coefficients and solubilities. The dissolution equilibrium constant of Na2B4O7·10H2O was calculated with the experimental solubility data and parameters. The calculated solubilities and water activities with the parameters and dissolution equilibrium constants of NaBO2·4H2O and Na2B4O7·10H2O agree with the experimental data.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qin Liu,Peipei Dang,Guodong Zhang,Hongzhou Lian,Ziyong Cheng,Guogang Li,Jun Lin
Mn2+-doped luminescent materials play a significant role in a variety of fields, including modern lighting, displays, and imaging. Mn2+ exhibits a broad and adjustable emission, hinging on the local environment of the crystal field and the interaction of the 3d5 electrons. However, it is still a challenge to realize the precise control of the emission of Mn2+ ions due to site-prior occupation in a specific lattice. Here, the formation of Mn–Mn dimers is proposed to be an effective strategy to design a novel red emission. Multimode emitters in Mn2+-activated AZn4(PO4)3 (A = K, Rb, and Cs) with unique [Zn4PO12] chains and [ZnOn] groups are observed to achieve regular green and unusual red emissions. KZn4(PO4)3:Mn2+ shows broad dual emissions at 542 and 608 nm, attributed to [MnO4] and [Mn2O7] dimers, respectively. While K is replaced with Rb and Cs, the Zn ions form [ZnO4] tetrahedra and [ZnO5] octahedra. RbZn4(PO4)3:Mn2+ exhibits a broad red emission at 618 nm, ascribing to [Mn2O7] and [Mn2O8] dimers. CsZn4(PO4)3:Mn2+ also displays a broad orange-red emission at 608–620 nm with increasing doping levels, deriving from energy transfer from [MnO5] to [Mn2O7] and [Mn2O8] dimers. This work provides a framework for creating novel red emissions from Mn2+-doped luminescent materials.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Hui Zhang,Zengkun Liu,Xiping Huang,Qi Zhang
The solubility data of sodium l-ascorbate in water, methanol, ethanol, acetone, chloroform, ethyl acetate, isopropyl alcohol, isobutyl alcohol, n-hexane, water–methanol mixture and water–ethanol mixture have been determined in the temperatures range of 278.15–323.15 K by a static analytic method at atmospheric pressure. The experimental data were correlated with the modified Apelblat equation, CNIBS/R-K model, and Jouyban–Acree model. On the basis of the solubility data, a novel model-free design approach (semisupersaturation control, SSSC) for combined cooling and antisolvent crystallization (CCAC) processes has been proposed and evaluated for sodium l-ascorbate in a methanol–water mixture. This approach can be easily implemented without complicated online monitors. Sodium l-ascorbate crystals with large and uniform morphology were obtained using the CCAC process, which was designed by the SSSC approach.
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高影响因子
BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Haotian Xie,Zhaojiang Yin,Guobin Wei,Binghui Li,Hanfeng Cui,Hao Fan,Jing Zhang
This study developed a dual-mode “on-off-on” sensor based on a bipyridine ruthenium metal–organic framework (Ru-MOF) and dual enzyme cleavage technology for the sensitive detection of the K-ras gene. The sensor combines electrogenerated chemiluminescence (ECL) and fluorescence (FL) detection modes, achieving high sensitivity and specificity in detecting the K-ras gene through catalytic hairpin assembly (CHA) and dual enzyme cleavage reactions. Experimental results showed that the detection limits for the K-ras gene were 0.044 fM (ECL) and 0.16 fM (FL), demonstrating excellent selectivity and stability during detection. Through testing actual samples, the sensor has shown potential for application in complex biological environments. This method offers an efficient and reliable new tool for cancer diagnosis and treatment.
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高影响因子
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