POLYHEDRON
·
2017
·
IF 1.926
Fugen Yuan,Zhanghai Gu,Li Li,Lin Sha
The reaction of Ce(O t Bu) 2 (NO 3 ) 2 , prepared in situ from (NH 4 ) 2 Ce(NO 3 ) 6 and t BuONa in a 1:4 M ratio in THF, and N -phenyldiethanolamine (C 6 H 5 )N(CH 2 CH 2 OH) 2 in a 1:1 M ratio led to a brown solution, to which 1,10-phenanthroline (phen) was added. Yellow crystals of Ce(NO 3 ) 3 (phen) 2 and red crystals of Ce 13 O 8 [(OCH 2 CH 2 ) 2 N(C 6 H 5 )] 18 ( 1 ) were produced respectively at 40 °C. Complex 1 is a novel polynuclear cerium(IV)-diolate compound with an 18 N-phenylaminediethanolate shell and a 13-nuclear cerium(IV)-oxo core. It catalyzed the polymerization of ε -caprolactone (CL) to produce PCL in very narrow molecular weight distribution.
研究领域:
无机化学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Mingxia Huang,Yongmei Fu,Youcai Lu,Wuping Liao,Zhongjun Li
By introducing the amine group into phosphorus extractant, a novel aminophosphine compound bis(2-ethylhexyl) ((2-ethylhexylamino)methyl) phosphine oxide (DEHAPO, abbreviated as A) was synthesized for the extraction of cerium (IV) (Ce(IV)) from sulfate medium (H 2 SO 4 ). The influence factors including extractant concentration, H 2 SO 4 concentration and temperature on the Ce(IV) extraction were investigated and discussed. It is found that the extraction ability of Ce(IV), thorium (IV) (Th(IV)) and rare earths (REs(III)) (La, Gd, Yb) decreases in sulphate medium in the following order: Ce(IV) > Th(IV) > REs(III). The extraction process is an exothermic reaction and the thermodynamic parameters were calculated. The extracted complex of Ce(HSO 4 ) 2 SO 4 ·A in loaded organic solution was identified by the slope methods and further proved by FT-IR spectral analysis. Stripping studies indicate that Ce(IV) can be effectively stripped from the organic phase. The results of separation factors ( β ) and saturation loading capacity demonstrate that DEHAPO could be used to selectively extract Ce(IV) from sulphate medium with high separation efficiency and good extraction ability.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Songsong Li,Jinglu Han,Yanling Li,Wuping Liao
Enlarging the steric hindrance to the molecular structures of extractants is a common way to improve their selectivity. To improve the separation factor of thorium(IV) and cerium(IV), cyclic groups having large steric hindrance such as phenyl, cyclohexyl, and benzyl were introduced into the α -aminophosphonate extractant molecules. Bis(2-ethylhexyl) ((phenylamino)methyl) phosphonate (PAMP), bis(2-ethylhexyl) ((cyclohexylamino)methyl) phosphonate (CAMP), and bis(2-ethylhexyl) ((benzylamine)methyl) phosphate (BAMP) were synthesized and applied in the separation and recovery of thorium(IV) and cerium(IV) from sulfuric acid solution. The separation ability between cerium(IV) and thorium(IV) descends in the order of CAMP > BAMP ≈ Cextrant230 > DEHAMP >> PAMP, which is consistent with the decreasing order of steric hindrance. Nearly non-extraction of both cerium(IV) and thorium(IV) and the lowest separation ability for PAMP will be due to the conjugation of the lone pair of the amino N atom and benzene ring in PAMP. Furthermore, the extraction of REs(Ⅲ) by CAMP is lower than that of thorium(IV). Thermodynamic parameters ( ΔG 0 , ΔH 0 , ΔS 0 ) and extraction equilibrium constants were determined. An extraction process was developed to separate and retrieve thorium(IV) and cerium(IV) from a bastnaesite leaching solution. The final product purity of CeO 2 and ThO 2 is 99% and 98.4%, respectively, and the yields are 90.2% and 97.6%, respectively.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2023
·Vol. 8
·期 2
·201-209
·
IF 4.7
Yang Jing,Liu Hao,Huang Yan,Li Li,Liu Huajie,Ding Yaping
An “on–off–on” fluorescence sensor was designed for rapidly and consecutively detecting 4-nitrophenol and cerium(IV) without the use of any labeling materials. The yellow carbon dots were synthesized by a simple one-step hydrothermal approach, and various techniques were applied to investigate the morphology, structure, and optical properties of the carbon dots. Under the optimal experimental conditions, 4-nitrophenol rapidly quenched the fluorescence of carbon dots as a result of the inner filter effect (IFE). The fluorescence intensity of carbon dots was linear with the concentration of 4-nitrophenol (1–150 μmol/L) and the limit of detection was 0.32 μmol/L. The fluorescence was gradually recovered as the cerium(IV) concentration (0.5–100 μmol/L) increased in CDs/4-NP, and the limit of detection was 0.16 μmol/L. The sensor showed good selectivity and demonstrated high accuracy for the analysis of 4-nitrophenol and cerium(IV) in actual water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Sujie Han,Ruoyu Dai,Yaoping Hu,Lei Han
Cerium, an abundant lanthanide element, is widely used in human industry. The accumulation of Ce 4+ ion, however, will damage the environment and biological organism. Therefore, its facile detection is highly needed. Herein, we design a hybrid sensing platform consisting of carbon dots (C-dots) and bathophenanthroline-disulfonate-Fe 2+ complex (Bphen-Fe 2+ ) for trace-level determination of Ce 4+ . Based on inner filter effect (IFE), the red-colored Bphen-Fe 2+ complex severely quenches the fluorescence of C-dots. After addition of Ce 4+ , Fe 2+ is oxidized to Fe 3+ , and the colorless Bphen-Fe 3+ complex generates, which weakens the IFE efficiency and leads to the fluorescence recovery of C-dots. Meanwhile, due to the decreasing amount of Bphen-Fe 2+ upon Ce 4+ addition, the red color of the solution gradually fades, which enables visual detection of Ce 4+ by the naked eyes. Under the optimized conditions, the C-dots/Bphen-Fe 2+ system realizes the fluorometric and colorimetric sensing of Ce 4+ in the range of 0.5–100 and 1.9–80 μM, with the limits of detection as low as 0.5 and 1.9 μM, respectively. This method also shows high selectivity over other common ions, and has an excellent applicability for monitoring of Ce 4+ in real water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
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
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 3
·1751-1765
·
IF 2.87
Sun Yiwen,Zhai Guangqun
Since cerium(IV) ammonium nitrate (CAN) could oxidize amidyl N–H moieties into nitrogen-centered radicals under proper conditions to initiate radical polymerization, CAN-acrylamide (AAm) redox-initiated radical homo/co-polymerization in a conventional or controlled manner was exploited with AAm as an intrinsically reducing inimer. CAN oxidized AAm to initiate conventional radical homopolymerization at 50–60 °C, and viscosity-average molecular weight (MW) of polyacrylamide (PAAm) steadily increased with conversion because of the oxidation of amidyl N–H moieties of in-chain -AAm- units, but MW was in a range from 10 4 to 10 5 . CAN-AAm redox-initiated radical co-polymerization of N,N -dimethylacrylamide (DMAAm) proceeded readily under optimized conditions and formed PAAm-co-PDMAAm with MW in a range from 10 5 to 10 6 , and increasing simultaneously with conversion. CAN-AAm redox-initiated controlled radical homopolymerization was performed with FeCl 3 complexes as the deactivator, and the polymerization proceeded in a mechanism of reverse atom transfer radical polymerization (ATRP) and MW of PAAm increased in proportion to conversion. The PAAm chains contained a C–Cl terminal, which was confirmed by block co-polymerization with DMAAm via standard ATRP with PAAm as the macro-initiator.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 28
·3470-3474
·
IF 2.073
Chen Wang,Rui Chen,Ruyu Zhang,Naidong Zhang
A rapid, simple, and sensitive spectrophotometric method for sulfate radical determination in aqueous solutions was developed, employing the reaction between sulfate radicals and cerium(III) sulfate to quantitatively generate cerium(IV) sulfate. The relative concentrations of sulfate radicals were evaluated through Ce4+ quantitation by UV-spectrophotometry. Factors affecting this method, including the concentration of cerium sulfate concentration, reaction time, pH, and inorganic anions, were investigated. Finally, using this method, the rate of sulfate radical generation by photolysis of peroxydisulfate under different light sources was studied.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2018
·Vol. 41
·期 22
·4115-4121
·
IF 2.415
Jie Li,Wangsheng Zeng,Xiaojing Lai,Xu Wang,Xin Xu,Hongping Cai,Lijun Wei,Xiang lei Cheng
A novel approach for the simultaneous and selective analysis of chlortetracycline, doxycycline, 4-epichlortetracycline, oxytetracycline, metacycline, and tetracycline by high-performance liquid chromatography coupled with sensitive post-column chemiluminescence reaction was set up. Six tetracyclines were separated through a simple and effective isocratic procedure using a mixture of acetonitrile and 3.5 mM methanesulfonic acid. After that, intensive chemiluminescence signals were produced by the reaction between cerium(IV) and methoxylated cypridina luciferin analogues system in the presence of tetracyclines. Under the appropriate experimental conditions, the developed method was evaluated by testing of linearity, limits of detection, precision, and accuracy. The limit of detection was from 2 to 10 nM and relative standard deviation of intraday precision was below 9%. The developed high-performance liquid chromatography with chemiluminescence method has been performed for the with trace analysis of tetracycline antibiotic residues in milk samples with satisfactory results.
研究领域:
分析化学
·
药物分析
✓ 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）