JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2691-2696
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IF 1.5
Wang Yi,Yang Jiajia,Sui Jixue,Wang Lan,Tang Jia,Yang Yu,Lu Yunyun,Dai Shuang,Cao Qi
Efficient separation of europium (Eu) from aqueous solution is pivotal for the sustainable development of nuclear industry and rare earth industry. In this work, bis(2-ethylhexyl) phosphate (P204) was employed to separate Eu(III) by solvent extraction method using kerosene as diluent. The extraction equilibrium could reach within 30-min contact time. The extraction ratio enhanced as the increased O:A phase ratio, extractant concentration, and temperature. However, the HCl introduction caused its clear descent. Combined with the slope method and FT-IR analysis, extraction mechanism could be unveiled, which is the coordination between P=O double bond and Eu(III) ions in a proportion of 3:1.
研究领域:
化学工程
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核工业
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稀土工业
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Qiang SONG,Wen-jie ZHANG,Xiong TONG,Xian XIE,Zhuo-yue LAN,Yun-peng DU,Yang CAO,Pei-qiang FAN
The kinetics of the bis(2-ethylhexyl) phosphate (HDEHP) extraction of lanthanum and cerium were investigated in a lactic acid complex system. The effects of stirring speed, specific interface area, temperature and concentration of different solution components on the extraction rate were studied using a constant interface cell device. When the stirring speed was 130–180 r/min, the extraction reaction rate was mainly controlled by the chemical reaction, and increased with increasing the specific interface and temperature. The extraction kinetics shows that the extraction reaction conforms to a pseudo-first-order reaction, and the mass transfer process occurs at the interface between the organic and liquid phases rather than in the bulk phase. The Gibbs free energy of the extraction reaction Δ G <0, indicating that the reaction can proceed spontaneously, while the calculation of the apparent activation energy shows that HDEHP is more likely to combine with cerium during extraction.
研究领域:
化学工程
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稀士化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Kai Li,Ji Chen,Dan Zou,Yuefeng Deng,Deqian Li
A novel extractant, 2-ethylhexyl Bis(2-ethylhexyl)phosphinate (EHBEHP, abbreviated as B), was synthesized for the extraction of Cerium(IV) (Ce(IV)) and fluorine (F(I)) from nitric acid (HNO 3 ) media. The effects of HNO 3 concentration, extractant concentration, F(I) concentration and the temperature on the Ce(IV) and F(I) extraction were studied and discussed. The experimental results show that EHBEHP has a strong ability to extract Ce(IV), while the presence of F(I) decreases the extraction ability of Ce(IV). The extraction process had nothing to do within the studied temperature range. The extraction of HNO 3 , Ce(IV) and Ce(IV)-F(I) were studied respectively, and the extracted complexes were found to be 2HNO 3 ·EHBEHP, Ce(NO 3 ) 4 ·2EHBEHP and Ce(HF)(NO 3 ) 4 ·EHBEHP, individually. The extraction mechanisms were determined according to slope analysis method. Saturation loading capacity of Ce(IV) and F(I) extracted by 0.867 mol/L EHBEHP in HNO 3 system was about 50.98 g/L and 5.67 g/L, respectively. The stripping experiment shows that 95.3% of stripping efficiency of Ce(IV) can be obtained with 2.4% H 2 O 2 . The FT-IR of extracted complexes were measured and characterized. EHBEHP shows higher extraction ability and saturation loading capacity compared with DEHEHP.
研究领域:
化学工程
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Wenbao Liu,Wengang Liu,Shujuan Dai,Ting Yang,Zhen Li,Ping Fang
Magnesite ore powder is the primary raw material used to prepare refractory magnesia. With the depletion of high-grade magnesite, methods to reduce the impurities and improve the quality of magnesite ore powder are urgently required. In this study, an ethanolamine-based surfactant, bis (2-hydroxyethyl) dodecylamine (BHDA), was first introduced into the flotation of magnesite ore as a novel collector, and the possibility of improving the purity of the ore was investigated by experiment and theory. Flotation tests, X-ray photoelectron spectroscopy, Fourier-transform-IR spectroscopy, and zeta potential measurements were carried out to study the behaviors and mechanisms by which the collector enhances the purity of magnesite ore powder. The flotation results revealed the noticeable difference in the floatability of quartz, magnesite, and dolomite when combined with the collector over a wide range of pulp pH values (4.18–9.17). The analytical results obtained from FTIR spectra, XPS, and zeta potential measurements indicate that BHDA was readily adsorbed on the surface of quartz, mainly by electrostatic and hydrogen bonding interactions, whereas it was adsorbed on the surfaces of magnesite and dolomite by weak electrostatic interactions. By introducing a hydroxyethyl group to the tertiary amine collector, more hydrogen bonds can form with the surface of quartz, strengthening the adsorption stability. Thus, compared to the traditional collector, dodecylamine, BHDA showed better desilication and purification performance for magnesite ore powder. Meanwhile, our results show that the simpler reagent system and process flow makes BHDA promising for the industrial purification of magnesite ore powder.
研究领域:
矿物加工工程
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材料科学与工程
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化学工程与技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 61
·55936-55945
·
IF 3.289
Ru Yan,Xiang Gao,Dandan Lv,Houyi Ma
Bis(2-ethylhexyl) phosphate (BEP) self-assembled thin films were prepared on iron substrates in water and ethanol solutions respectively and the formation mechanisms were investigated by means of attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). For the iron samples treated with BEP aqueous and alcoholic solutions, the appearance of characteristic functional groups in the ATR-FTIR spectra indicated the existence of BEP molecules on the iron surface. XPS results further demonstrated that, BEP molecules bound to the iron surface in different ways in the case of water and ethanol as solvents, leading to the formation of two types of self-assembled monolayers (SAMs). In the ethanol solution, the BEP SAMs formed on the iron surface by both electrostatic interaction and chemical covalent binding, denoted as BEPE SAMs; in the aqueous solution, the BEP SAMs formed on the iron surface only through P–O–Fe (substrate) bond between iron substrate and BEP molecules, denoted as BEPW SAMs. The BEPE SAMs showed an island-like surface morphology, while BEPW SAMs had a nodule-like appearance. When used as ultrathin coatings for corrosion protection, the great differences in microstructure, morphology and compactness between the two BEP SAMs had a strong influence on their anti-corrosive properties, which in turn led to an interesting phenomenon that BEPW SAMs showed much better corrosion protection ability than BEPE SAMs under otherwise identical conditions.
研究领域:
材料科学
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表面化学
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腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Ziqi Zeng,Guizhou Liu,Zhipeng Jiang,Linfeng Peng,Jia Xie
Poly (ethylene oxide) based solid polymer electrolytes are suitable candidates for constructing all-solid-state lithium metal batteries . However, the low ionic conductivities , poor mechanical strength and incompetence to suppress the penetration of Li dendrites hinder their practical application. Herein, we introduce Zinc bis(2-ethylhexanoate) (Zn (BEH) 2 ) as a homogeneous and bifunctional additive into PEO network by a simple solution casting method to achieve improvements of ionic conductivity and uniformity of lithium deposition. It is shown that the Lewis acid–base interactions between Zn (BEH) 2 and PEO chains suppress the polymer crystallization and weaken the O–Li + interaction, resulting in a good ionic conductivity of 1.1 × 10 −5 S cm −1 at 30 °C, 2.7 × 10 −4 S cm −1 at 60 °C and an improved lithium ion transfer number of 0.5 at 60 °C. Furthermore, a LiZn alloy layer is formed in-situ on lithium metal anode via the reaction between Zn (BEH) 2 and Li, which effectively prevents dendrite growth. Based on PEO–Zn (BEH) 2 polymer electrolyte, a Li/Li symmetric cell exhibits a steady cycling over 500 h with a low polarization potential of 150 mV. This strategy will illuminate new design strategy to advance polymer electrolytes towards high performance solid-state lithium batteries .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2016
·Vol. 32
·期 3
·665-670
·
IF 0.844
HU Ai-Bin,PAN Zhi-Quan,CHENG Qing-Rong,ZHOU Hong
Supramolecular complex (1) was obtained from a mixture of squaric acid and 2,6-bis(2-benzimidazolyl)pyridine in deuterated dimethylsulfoxide (d-DMSO) and characterized by single-crystal X-ray diffraction. The crystal structure data showed that 1 was a one-dimensional chain
polymer assembled through π-π stacking and hydrogen bonding interactions. Infrared vibrational spectra of 1 were measured at different temperatures and sample concentrations in carbon tetrachloride. Moreover, the hydrogen bonding in the crystals was further evaluated
by density functional theory (DFT) and atoms in molecules (AIM) theory. The calculated hydrogen bonding energies were about 135.65 and 49.40 J·mol-1, respectively.
研究领域:
化学
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理论化学
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材料科学
✓ 已验证
DOI
高影响因子
Silicon
·
2024
·
IF 2.8
Mo Zhangchao,Zhu Xiaoxiao,Jiang Xuesong,Ding Juxuan,Wang Ling,Ban Boyuan,Sun Jifei,Chen Jian
Improving the purity of glass fiber powder represents a crucial challenge that needs to be addressed in the development of the glass fiber industry. To investigate the flotation behavior of glass fiber powder and the adsorption mechanism of the collector on its surface, the effect of flotation time, collector type, and concentration in flotation experiments was studied. Zeta potential, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) were used for systematic analysis. The results show that flotation effectively removes the visible impurities mixed in the glass fiber powder. The collection capacity of poly (propylene glycol) bis (2-aminopropyl ether) (PEA) generally surpasses that of conventional monoamine collectors. With the novel collector PEA, especially at a concentration of 6 × 10 −5 mol/L of PEA-D2000, the flotation recovery rate of glass fiber powder can reach approximately 95%. Furthermore, a flotation mechanism for the glass fiber powder using amine-based collectors is proposed. It is adsorbed onto the surface of glass fiber powder through − NH 3 + /−NH 2 groups, primarily by hydrogen bonding, and supplemented by electrostatic adsorption.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Xiuquan Yao,Yuming Lai,Feifei Huang,Yujie Qiang,Ying Jin
In this paper, 5,5′-Dithiobis-(2-nitrobenzoic acid) (DTNB) was used as an organic self-assembled monolayer on copper surface for the first time. The inhibition performance in 3.5 wt% NaCl solution was studied via electrochemical techniques, surface analysis methods and theoretical calculations. The influence of concentration on inhibition performance of DTNB was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization. It is found that the inhibition efficiency of the self-assembled monolayer first increases and then decreases with the addition of DTNB, and the maximum inhibition efficiency is 92.4% at the DTNB concentration of 1 × 10 -3 mol·L -1 . The inhibition effect of DTNB was also evaluated by morphology observation of copper using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Raman spectroscopy, X-ray photoelectron spectroscopy and quantum chemical calculations were utilized to determine that DTNB is well bound to copper surface through chemical bonds.
研究领域:
材料科学
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电化学
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Xiuying Yang,Dongping Su,Lianjun Song,Xueyu Wang,Qian Xiao,Qiuxia Feng,Songdong Ding
The synthesis, Eu 3+ complexation, and selective solvent extraction of trivalent americium (Am 3+ ) over trivalent europium (Eu 3+ ) in nitric acid solution by N-donor ligand of 3,5-bis(2-pyridyl)pyrazole (BisPypzH) were described. By using tert -butyl benzene as diluent, BisPypzH ligand in combination with 2-bromohexanoic acid demonstrated the extraction selectivity for Am 3+ over trivalent lanthanides (Ln 3+ ) with the separation factor ( SF Am/Ln ) value ranging from 14.3 to 59.4. Slope analysis showed the formation of 1:1 and 1:2 metal/ligand extracted species corresponding to the BisPypzH concentration below and above 0.025 mol/L, respectively, which was also confirmed by electrospray ionization mass spectrometry (ESI-MS) and dynamic light scattering (DLS) analyses. The extraction conformed to a cation-exchange model. Additionally, the 1:1 and 1:2 metal/ligand complexes were also observed in methanol solution and in solid state, severally, by means of UV–vis spectroscopy, luminescence spectroscopy and ESI-MS. Furthermore, the analyses of Fourier transform infrared spectra (FTIR), Raman spectra, and time-resolved laser-induced fluorescence spectra (TRLFS) indicated the presence of three bidentate NO 3 − and the absence of H 2 O molecules in the inner coordination sphere of the central Eu cation in the complex. Meanwhile, the stability constant for BisPypzH-Eu complex was also given.
研究领域:
化学
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核化学
·
分析化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Bo-Hui Huang,San-San Shen,Na Wei,Xiao-Feng Guo,Hong Wang
An efficient and stable fluorescent sensor is described for the detection and imaging of thiols. It is making use of silicon quantum dots (SiQDs) which can be rapidly prepared. They were characterized by transmission electron microscopy , X-ray power diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry . The SiQDs have an absorption maximum at 300 nm and displayed blue-green fluorescence with excitation/emission maxima at 410/480 nm. A mixture of SiQDs and 5,5′-dithiobis-(2-nitrobenzoic acid) (DTNB) exhibits strong fluorescence emission which however is quenched within 30 s of incubation with thiols. This is assumed to be due to an inner filter effect caused by the reaction of DTNB and thiols. The following thiols were tested: cysteine, homocysteine , and glutathione . The sensor has a linear response in the 3–100 μM thiol concentration range, and the LODs are between 0.80 and 0.96 μM. The sensor displays low cytotoxicity and was applied to fluorescence imaging of MCF-7 cells and Hela cells where it demonstrated excellent biocompatibility.
研究领域:
生物化学
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分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yang Li,Yang Zhang,Xue Zhong Wang
The solubility of dimethyl 2,2′-azobis(2-methylpropionate) (AIBME) was determined in 15 pure solvents, including cyclohexane, dichloromethane, diethyl ether, acetone, tetrahydrofuran, ethyl acetate, tetrachloromethane, acetonitrile, methylbenzene, methanol, ethanol, n-propyl alcohol, isopropanol, n-butyl alcohol, and iso-butyl alcohol, and in a binary solvent system (methanol + water) at the temperature range from 253.15 to 293.15 K at atmospheric pressure. Between 278.15 and 293.15 K, the solubility of AIBME is more sensitive to temperature in alcohol solvents than in other solvents. However, the solubility of AIBME in nonalcoholic solvents decreased more rapidly than in alcohol solvents below 278.15 K. The AIBME solubility in the binary solvent system (methanol + water) is positive to temperature and the initial mole fraction of methanol. The measured solubility data of AIBME in pure solvents were correlated by the modified Apelblat equation, the λh equation, the nonrandom two-liquid (NRTL) model, and the Wilson model. The measured solubility data of AIBME in binary solvent systems were correlated by the modified Apelblat equation, the nonrandom two-liquid (NRTL) model, and the Wilson model. Among the four models, the NRTL model is the best model to fit the solubility of AIBME, especially in alcohol solvents. In addition, the mixing properties of AIBME in 15 pure solvents, including standard mixing Gibbs energy, mixing enthalpy, and mixing entropy, were calculated and discussed. The results provide useful information for practical optimization of AIBME crystallization processes.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）