JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Sa-Ying Li,Pan Liang
Two alkaline-earth metal borates BaZn 2 B 2 O 6 with NLO property and Ba 2 Cd(B 3 O 6 ) 2 with birefringent property have been synthesized and characterized by XRD, FT-IR, and chemical analysis. The molar enthalpies of solution of BaZn 2 B 2 O 6 (s) and Ba 2 Cd(B 3 O 6 ) 2 (s) in 2.00 mL of 1 mol·dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CdCl 2 ·2.5H 2 O(s) and ZnO(s) in the mixture solvent of 2.00 mL of {1 mol·dm –3 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O} (aq) were also measured, respectively. With the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in 2.00 mL of 1 mol· dm –3 HCl (aq), Ba(OH) 2 ·8H 2 O) in the mixture solvent of (2.00 mL of 1 mol·dm −3 HCl + H 3 BO 3 ) (aq), together with the standard molar enthalpies of formation for CdCl 2 ·2.5H 2 O(s)/ZnO(s), Ba(OH) 2 ·8H 2 O(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (2703.0 ± 2.2) kJ·mol −1 for BaZn 2 B 2 O 6 (s) and – (5625.26 ± 5.1) kJ·mol −1 for Ba 2 Cd(B 3 O 6 ) 2 at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 4
·377
·
IF 3.52
Wei Yu,Wenfeng Han,Yongnan Liu,Jiaqin Lu,Hong Yang,Bing Liu,Haodong Tang,Aimin Chen,Ying Li
BaClxFyas well as BaF2and BaClF catalysts were prepared by solid-state reaction at room temperature with Ba(OH)2as the precursor and NH4F/NH4Cl as the F and Cl sources. The catalysts were applied for the dehydrochlorination of 1-chloro-1,1-difluoroethane to vinylidene fluoride at 350 °C. The industrial manufacture of vinylidene fluoride (VDF) is carried out at 600–700 °C, whereas the BaClxFycatalysts provided a promising pathway to produce VDF at much lower temperatures. Unfortunately, the selectivity of VDF over BaF2decreased from 94% to 84% along with the deactivation of the BaF2catalyst monotonically. In the presence of small amounts of Cl in BaF2, stabilized selectivity was achieved. Over BaCl0.05F0.95, BaCl0.1F0.9and BaCl0.25F0.75, no decrease in VDF selectivity was observed. Clearly, the presence of small amounts Cl during solid-state preparation inhibited the growth of BaF2crystalline significantly. Far smaller particles were achieved. The particle size, or more precisely, the crystal size of the barium catalyst played a major role in the catalytic performance. In addition to the crystal growth, the presence of small amounts of Cl during catalyst preparation changed the chemical state of Ba, and therefore the adsorption and activation of the C–Cl bond for HCFC-142b were altered.Keywords:barium chlorofluoride;catalytic pyrolysis;barium fluoride;dehydrochlorination;1-chloro-1,1-difluoroethane;vinylidene fluoride
研究领域:
化学工程
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材料科学
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催化
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DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2016
·Vol. 89
·期 7
·1145-1157
·
IF 0.307
Yu Ting,Yang Xu,Yuan Jianlan,Guo Li,Wu Xiaoling,Wang Hao
In drilling and production process, the barite powder serving as weighting agent is added to ensure operation safety when overflow occurs, that results in reservoir pollution and pore blockage. The main component of barite is BaSO 4 , so ammonium carboxy chelating agents can be injected into formation to form stable chelates with Ba 2+ , BaSO 4 will be eliminated from wellbore with flowback fluid easily. In this experiment, the weight method and the atomic absorption spectrometry method were utilized to study descaling ability and an action mechanism of descaling agents. Firstly, DTPA was selected from three descaling agents: NTA, EDTA, DTPA; then OT1 was screened out to synergize with DTPA and studied its descaling mechanism; eventually, the descaling system STD was determined, and its composition was 6% DTPA + 5% OT1 + 1% antiswelling agent + 100 ppm corrosion inhibitor. And the STD’s performance evaluation experiment results suggested that it had an excellent resistance to temperature and demonstrated a good descaling ability at 170°C. Furthermore, the descaling ability of STD was almost not affected by calcium and magnesium ions and its corrsion rate is lower than standard value. Moreover, STD could descale efficiently at lower dosage. So STD can be widely applied to descale in oilfield.
研究领域:
石油工程
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 2
·673-684
·
IF 2.5
Zhao Dongliang,Zhou Peng,Li Xiangzhou,Song Ke
Mesoporous carbon has become a research hot spot due to its excellent properties and broad application prospects. In this study, mesoporous carbon was synthesized simply by carbonizing a composite of chitosan (CS) and nano-barium carbonate, taking advantage of the excellent flocculability of CS. The structure and morphology of chitosan-based mesoporous carbon (CSMC) were characterized using BET, SEM, FT-IR, XRD, XPS and Raman techniques. The results revealed that CSMC possessed a graphitic and diamond-like structure consisting of C (92.8%), O (6.9%) and N (0.3%). The mass ratio of BaCO 3 /CS played an important role in pore formation, with CSMC5 exhibiting a specific surface area and mesoporous surface area up to 2211 and 1119 m 2 /g, respectively. The adsorption performance of CSMC was tested with chlorogenic acid (CA) as the adsorption object. The saturated adsorption capacity of CSMC for CA was up to 742.52 mg/g and the adsorption rate was rapid. The adsorption behavior of CA by CSMC conformed to Langmuir isothermal adsorption model and pseudo-second-order kinetic model. Thermodynamic parameters indicated that the adsorption of CA by CSMC was exothermic and reversible. This study provides a promising approach for the synthesis of chitosan-based mesoporous carbon materials and potential applications in sustainable technologies.
研究领域:
材料科学
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环境科学
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化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2012
·
IF 4.601
Wenlong Yin,Kai Feng,Wendong Wang,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The twelve quaternary rare-earth selenides Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) have been synthesized for the first time. The compounds Ba2GaLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) are isostructural and crystallize in a new structure type in the centrosymmetric space group P1̅ of the triclinic system while the isostructural compounds Ba2InLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) belong to the Ba2BiInS5 structure type and crystallize in the noncentrosymmetric space group Cmc21 of the orthorhombic system. The structures contain infinite one-dimensional anionic chains 1∞[GaLnSe5]4– and 1∞[InLnSe5]4–, and both chains are built from LnSe6 octahedra and MSe4 (M = Ga, In) tetrahedra in the corresponding selenides. As deduced from the diffuse reflectance spectra, the band gaps of most Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) compounds are around 2.2 eV. The magnetic susceptibility measurements on Ba2GaGdSe5 and Ba2InLnSe5 (Ln = Nd, Gd, Dy, Er) indicate that they are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmSe5 deviates from the Curie–Weiss law as a result of the crystal field splitting. Furthermore, Ba2InYSe5 exhibits a strong second harmonic generation response close to that of AgGaSe2, when probed with the 2090 nm laser as fundamental wavelength.
研究领域:
材料科学
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固体化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2013
·
IF 1.21
Shu-Chao Wu,Chao-Yang Sun,Wen-Ni Wang,Ying-Ting He,Sheng-Hong Hu,Cun-Jiang Zheng
In this paper, separation of Sr from associated elements (Na, K, Ca, Mg, and Ba) was carried out using an extraction chromatographic column packed with Sr selective specific resin consisting of an octanol solution of 4,4′(5′)-bis( t -butylcyclohexo)-18-crown-6 sorbed on an inert polymeric support. Using 8.0 mol/L HNO 3 as the eluent, Ba and associated elements were eluted immediately from the column, whereas Sr was strongly retained. The adsorbed Sr could then be stripped from the column as the eluent was changed to 0.05 mol/L HNO 3 . Complete Sr/Ba separation was demonstrated to be feasible in that Ba could be washed from the column leaving pure Sr by adequate rinsing with 8.0 mol/L HNO 3 . Furthermore, matrix effect could be effectively eliminated and the selectivity of the method was improved. The method was applied for the determination of Sr in the high purity barium carbonate (BaCO 3 ) product and seawater. The recoveries of Sr in 2 samples were determined to be 93.2% and 109%, respectively.
研究领域:
化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xingyuan Wan,Kaixi Jiang,Ting'an Zhang,Kun Wang,Han Yang,Shengnan Lin
Upgrading copper slag into value-added products provides an untapped opportunity to address arsenic pollution in the environment and promote waste recycling, but the problem of excessive arsenic in products remains a huge engineering challenge. Herein, we employ DFT calculations to explore the dissociation mechanism of AsMA and propose a universal descriptor for screening As removal agents for the first time. The dissociation of AsMA is related to the disturbance of the Mo-As bond by Ba and follows the “Perturbation – Re-stabilization – Dissociation” mechanism. The B Ψ value of Ba is near the minimum value of −0.1058 in the universal descriptors, which renders it potential candidates for As removal agents. As expected, Ba can increase As removal efficiency by approximately 45 % when employing the Si-Ca-Ba alloy compared to other Ca-based alloys. This work offers contributions to the As removal technology for copper slag value-added products while also highlighting the DFT calculations used in guiding engineering practices.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wen Cui,Lvcun Chen,Jieyuan Li,Ying Zhou,Yanjuan Sun,Guangming Jiang,S.C. Lee,Fan Dong
Semiconductor-based photocatalysis has attracted considerable interdisciplinary attention for its diverse applications in environmental remediation and solar energy conversion. However, pure earth-abundant insulators have been seldom considered as photocatalysts because of the unfeasible electronic excitation. In this work, we make the earth-abundant insulator BaSO 4 as conceptually new photocatalyst via Ba-vacancy engineering for the first time. The BaSO 4 with Ba-vacancy is synthesized by a facile precipitation method and applied for photocatalytic NO removal in air. XAFS spectroscopy and DFT calculations demonstrate the formation of Ba-vacancy. Also, defect level induced by Ba-vacancy between the wide band gap is demonstrated, which endows insulator BaSO 4 with semiconductor-like photocatalytic performance. Besides, according to the TPD analysis and theoretical simulation, Ba species is functioned as the NOx storage center for the primary accumulation of NO molecule on substrate, and simultaneously Ba-vacancy is equipped with the capability to redistribute charge carriers and thus accelerate the activation of NO molecule by the donation of electrons to electron-deficient areas, facilitating the conversion of NO into a higher valance state for further favorable photocatalytic oxidation. In situ DRIFTS spectra are applied to dynamically monitor intermediates and products on photocatalyst surface, revealing the reaction process and the enhancement role of Ba-vacancy. This work opens a new research doorway on earth-abundant insulators for the development of a new family of photocatalyst.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Planetary Science Journal
·
2025
·Vol. 6
·期 3
·55
·
IF 4.3
Erbin Shi,Xiaojia Zeng,Jian Chen,Enming Ju,Zongcheng Ling
Calcium sulfates are widely distributed in Gale crater and Endeavour crater on Mars. However, the mole ratios of Ca2+ and SO3 in some Sr–Ba-rich sulfate veins are less than 1. This indicates that there may be additional solid solution phases on Mars, including Ca–Sr, Ba–Sr, and Ca–Ba sulfates, which, on Earth, are typically found in marine environments. In this study, we synthesized a series of Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solutions in the laboratory. These synthesized solid solutions were then characterized using various techniques, including X-ray powder diffraction (XRD), Raman, mid-infrared, and visible and near-infrared. Our results show that the XRD and Raman spectra of Ca–Sr and Ba–Sr sulfates varied with their cation contents. In particular, the linear relationships (R2 ≥ 0.98) between the mole ratios of cation ions and peak positions of {{\rm{SO}}}_{4}^{2{-}} tetrahedron (v1) in Raman spectra were obtained. The mole content of Ca2+, Sr2+, and Ba2+ can be precisely constrained in Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solution phases through linear relationships, respectively. These results are the experimental basis for analyzing in situ detection data (e.g., SHERLOC, SuperCam, and Oxia planum) and can be used to precisely constrain the mineral phases of calcium sulfate veins on Mars.
研究领域:
地质学
·
行星科学
·
光谱学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2022
·Vol. 38
·期 2
·449-456
·
IF 4.351
Wengang Liu,Yuchen An,Qinyuan Qu,Pengfei Li,Lixin Zhang,Chaofeng Li,Shuang Wei,Hongying Zhou,Jiubin Chen
Barium (Ba) is a major element in many geological samples (e.g. barite/witherite-rich samples) and introduces serious oxide and hydroxide interferences during the analysis of rare earth elements (REEs) by ICP-MS. Hence, eliminating Ba interference is an indispensable step for accurate ICP-MS analysis of REEs. Though ion-exchange chromatography is widely used for REE purification, the tediousness, time consumption and high cost limit the application of this purification method. In this study, we developed a rapid and reliable separation method to eliminate Ba from geological samples for the precise measurement of REEs by ICP-MS. The new method was established based on the difference in solubility between Ba and REEs in concentrated nitric acid as barium nitrate (Ba(NO3)2) is almost insoluble, in contrast to REEs. The whole separation procedure could be completed in less than two hours and only consumed 1.5 mL 15 M nitric acid. The protocol resulted in acceptable procedural blanks (below 0.02 ng mL−1), quantitative recovery (96–103%) of REEs, and limited Ba content (0.37 ± 0.14 μg mL−1, (2SD, n = 50)) in the purified solution (50 mL), in which the interference effect could be eventually eliminated by mathematical correction during the ICP-MS analysis. The method was successfully applied to four natural barite-rich samples with BaSO4 content ranging from 18.87 wt% to 42.41 wt%. Overall, this accurate and rapid method shows great potential for the precise determination of the REE content in Ba-rich samples by ICP-MS.
研究领域:
分析化学
·
地球化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiaojian Zhang,Zhiqin Zhang,Yamin Feng,Honglei Yuan,Gaoliang Wang
Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors were synthesized by sintering at 910 °C for 24 h under air in a muffle furnace. The phase, luminescence properties and potential applications in LED devices were investigated. X-ray diffraction results indicate the successful doping of Bi 3+ ions in Ba 3 Lu 2 B 6 O 15 host. The diffuse reflectance and excitation spectra demonstrate the excitability on UV light. Upon the excitation at 365 nm, the Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors show narrowband blue emission with the peak at 417 nm. The highest emission intensity with the quantum yield of 85.7% and ΔE a value of 0.215 eV is generated by the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor. The light characteristics of the UV-pumped LED devices containing the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor demonstrate the potential application of Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors in the lighting field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 22
·5655
·
IF 3.1
Tianyu Hao,Jing Shen,Qiaochu Peng,Jie Liu,Wenbin Hu,Cheng Zhong
This study successfully synthesized high-tetragonality barium titanate (BaTiO3) particles with a small particle size by implementing ball milling in the solid-state synthesis of BaTiO3and utilizing nanoscale raw materials. This study also addressed the issues of impurities and uneven particle size distribution that could exist in the synthesized BaTiO3particles. The crystal structure, morphology, and particle size of the synthesized BaTiO3particles have been meticulously analyzed and discussed through the use of techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and the laser particle size analyzer. BaTiO3has been successfully synthesized, exhibiting a uniform particle size with an average diameter of 170 nm and a high tetragonality value of 1.01022. This new solid-state synthesis method provided insights to avoid the impact of “size effects” during the process of electronic device miniaturization.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）