Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Xue Luo,Jiahui Liu,Danhui Li,Lili Zhao,Hualiang An
Cyclopentanone self-condensation to 2-cyclopentylidenecyclopentanone is one of the key steps in synthesizing high-density fuels. In this study, MgAl-LDO(NO3−) catalysts, prepared via coprecipitation, demonstrated good catalytic performance. Meanwhile, Mg2Al-LDO(NO3−) catalysts with different Mg/Al ratios were explored. Characterization by XRD, NH3-TPD and CO2-TPD revealed that Mg2Al-LDO(NO3−) possessed appropriate acid–base active sites, correlating with its enhanced catalytic performance. Under optimized reaction conditions, cyclopentanone conversion reached 85.9% with 98.8% selectivity toward 2-cyclopentylidenecyclopentanone. Furthermore, the reusability of the catalyst was investigated. XRD, SEM, and N2 adsorption–desorption analyses indicated that structural changes in the Mg2Al-LDO(NO3−) catalyst led to its deactivation. GC-MS analysis of the reaction system identified the primary by-product as 2,5-dicyclopentylidenecyclopentanone. Based on these findings, a plausible reaction network is proposed.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 6
·4242-4251
·
IF 3.5
Shuya Wang,Wenzhi Sun,Tingting Zhao,Chunqing Fu,Xiaoyan Fu,Hongwu Zhang
In this paper, X-ray-activated super long persistent ultraviolet A luminescence from Ca 3 (PO 4 ) 2 : Ce 3+ has been observed. The crystal structure analysis has shown that the as-prepared samples are pure β-Ca 3 (PO 4 ) 2 phases with rhombohedral structure and R 3 c space group. The photoluminescent spectra of the samples all consist of a broad band in 340–400 nm UVA1 region, which is assigned to the 5d 1 –4f 1 electronic transition of Ce 3+ ions. More important, under the 3 min X-ray irradiation, Ca 3 (PO 4 ) 2 : Ce 3+ show super long persistent luminescence in the UVA1 region, which can persist for more than 16 h. And its afterglow intensity after 16 h decay is still 4.10 times stronger of the back ground intensity. Furthermore, only 10 s X-ray irradiation can induce excellent long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ , which can persist for more than 5 h and afterglow emission intensity is about 3.03 times of the background intensity. The trap analysis has confirmed that the different X-ray irradiation time do not create new traps and there is the same trap with 0.75 eV trap depth existing even under the extremely low X-ray dose (10 s X-ray irradiation). Furthermore, under 10 s X-ray irradiation, the thermoluminescence (TL) intensity of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ still reaches 0.32 times of the initial TL intensity even after 120 min, which thus leads to the super long persistent luminescence. Thus, the large amounts of trapped electrons induced by the high energy X-ray irradiation are the principal cause for super long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : Ce 3+ .
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高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Cheng Liu,Wencai Zhang,Hongqiang Li
In this study, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was introduced as a depressant for the flotation separation of apatite from calcite. The micro-flotation test results showed that good floatability of both apatite and calcite were obtained at around pH 8.5 when using sodium oleate (NaOl) as collector. Mixed minerals flotation test results showed that an efficient separation of apatite from calcite was achieved using PBTCA as depressant, which presented a selective depression for the calcite. Zeta potential measurements indicated that the addition of PBTCA prior to NaOl did not interfere the interaction between NaOl and apatite while it decreased NaOl adsorption on calcite surface.
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高影响因子
SYNTHESIS-STUTTGART
·
2025
·Vol. 57
·期 14
·2241-2251
·
IF 2.3
Yilun Song,Deyang Liu,Shunxi Dong,Xiaoming Feng
A highly enantioselective alkoxylation reaction of 3-bromo-3-substituted 2-oxindoles with alcohols was achieved by a chiral Ni(II)/N,N′-dioxide complex. This strategy provided an efficient route to various enantioenriched 3-alkyl 3-alkyloxy-2-oxindoles with good yield and enantiomeric ratio (40 examples, up to 99% yield, 95:5 er). Moreover, phenol and benzenethiol were also compatible with the reaction conditions. The gram-scale synthesis of an optically active product and its further transformation into CPC-1 analogue demonstrated the potential utility of the method. In addition, a catalytic cycle as well as a possible working mode was provided to understand the enantioselectivity of the reaction.
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高影响因子
Chemistry-An Asian Journal
·
2015
·Vol. 10
·期 11
·2452-2459
·
IF 4.587
Yuepeng Pang,Yongfeng Liu,Xin Zhang,Qian Li,Mingxia Gao,Hongge Pan
Herein, an initial attempt to understand the relationships between hydrogen storage properties, reaction pathways, and material compositions in LiBH 4 – x Mg(AlH 4 ) 2 composites is demonstrated. The hydrogen storage properties and the reaction pathways for hydrogen release from LiBH 4 – x Mg(AlH 4 ) 2 composites with x =1/6, 1/4, and 1/2 were systematically investigated. All of the composites exhibit a four-step dehydrogenation event upon heating, but the pathways for hydrogen desorption/absorption are varied with decreasing LiBH 4 /Mg(AlH 4 ) 2 molar ratios. Thermodynamic and kinetic investigations reveal that different x values lead to different enthalpy changes for the third and fourth dehydrogenation steps and varied apparent activation energies for the first, second, and third dehydrogenation steps. Thermodynamic and kinetic destabilization caused by the presence of Mg(AlH 4 ) 2 is likely to be responsible for the different hydrogen desorption/absorption performances of the LiBH 4 – x Mg(AlH 4 ) 2 composites.
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高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zonghua Pu,Qian Liu,Abdullah H. Qusti,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028 F g −1 at a current density of 10 A g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100 A g −1 , the array still shows a very high specific capacitance of 1059 F g −1 .
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高影响因子
JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
·
2016
·Vol. 46
·期 3
·128-136
·
IF 0.572
Peng Jun-Ling,Gao Ming-Juan,Wu Jian-Zhong,Ou Yong-Cong,Yu Ying
Two IIB group metal complexes based on 2-hydroxypyrimidine-4,6-dicarboxylic acid (H 3 L), formulated as {[Zn 3 L 2 (H 2 O) 4 ]·2H 2 O}
n
( 1 ) and {[Cd 3 L 2 (H 2 O) 6 ]·H 2 O}
n
( 2 ), have been synthesized solvothermally. Structural studies reveal that 1 and 2 are two- and one-dimensional polymeric networks, respectively, both of which are expanded to three-dimensional supramolecular structures by hydrogen bonds. The L 3− ligand takes the same μ 4 κ 5 ligation mode in both complexes. The Zn(II) coordination polyhedron in 1 is either octahedral or square pyramidal, but the Cd(II) atoms in 2 adopt two different octahedral polyhedra. Both 1 and 2 display remarkably strengthened fluorescence compared to the free H 3 L, and 1 emits much stronger than 2 , consistent with the structural features. Graphical Zn(II) and Cd(II) coordination polymers of 2-hydroxypyrimidine-4,6-dicarboxylic acid with 2D and 1D dimensions respectively exhibit different photoluminescence behavior.
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高影响因子
Science China-Materials
·
2019
·Vol. 62
·期 12
·1815-1820
·
IF 5.636
Wang Yanhong,Liu Hang,Fu Peng,Lu Hongcheng
A new one-dimensional (1D) antiferromagnetic transition metal hybrid fluoride CoF 2 (H 2 O) 2 (pyz) (pyz = pyrazine) together with two new isostructural MF 2 (H 2 O) 2 (pyz) (M = Ni 2+ , Zn 2+ ) have been successfully synthesized by the hydrothermal method. Their structures were determined by single crystal X-ray diffraction and they all crystallize in the same space group of C2/ m . The magnetic property of CoF 2 (H 2 O) 2 (pyz) 1 was measured and discussed. The Weiss constant of -20.6 K indicates dominant antiferromagnetic interaction and the effective magnetic moment of about 5.66 μ B suggests large unquenched orbital contribution and anisotropy in 1. The quantum fluctuations in the quasi-1D antiferromagnet of 1 prevent the appearance of long range magnetic order until 2.9 K, suggesting good 1D magnetism.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Runhua Gao,Handing Liu,Bowen Fu,Shuyang Li,Ziyao Long,Dalin Sun,Yun Song
Germanium-based materials possess high theoretical capacity of approximately 1000 mAh·g −1 , nevertheless, the practical electrochemical performance is severely hampered by poor cyclability due to volumetric expansion of Ge upon cycling. Herein, novel hydrangea-like CoGeO 2 (OH) 2 constructed by 2D nanoplates has been facilely synthesized with the assistance of ethylene glycol and further applied to anode materials for lithium ion storage. The hydrangea-like CoGeO 2 (OH) 2 anode exhibits an enhanced specific capacity of 1174 mAh·g −1 at a current density of 0.5 A g −1 after 100 cycles. Such outstanding electrochemical performance could be accredited to the rationally designed hydrangea-like structure, which can relieve the interval stress aroused by lithiation/de-lithiation, shorten the pathway of electron/ion transportation and take advantage of the pseudocapacitive nature of two dimensional nanosheets that could improve the reaction kinetics and endow the material with remarkable rate capability. Moreover, the inherent Co-bonded hydroxyl groups facilitate the pseudocapacitive effect, and Ge-based component contributes to the capacity. These advantages help CoGeO 2 (OH) 2 hydrangeas gain a competitive edge over other candidates of anode materials for lithium-ion batteries.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 11.3
Jinchen Jiang,Haixia Meng,Zhenhao Shu,Nannan Zhao,Xiaojun Lin,Jianglan Li,Minjun Qin,Siyu Wu,Lianglin Qiu
As an emerging alternative to perfluorooctanesulfonate (PFOS), 6:2 chlorinated polyfluoroalkyl ether sulfonate (6:2 Cl-PFAES) is associated with male reproductive disorders, yet its testicular targets and mechanisms remain unclear. This study combined in vivo exposure of male C57BL/6J mice (0, 4, 40, and 400 μg/L for 18 weeks) and in vitro assays in primary Leydig cells to demonstrate that 6:2 Cl-PFAES dose-dependently reduced sperm count and serum/testicular testosterone, accompanied by testicular interstitial vacuolation. Transcriptomics and metabolomics demonstrated the concurrent significant enrichment of autophagy pathways and disruption of lipid metabolism. Mechanistically, 6:2 Cl-PFAES suppressed expressions of Sirtuin 1 (SIRT1), ras-related GTP binding protein 7 (RAB7), and deacetylation of forkhead box class O1 (FOXO1), thereby impairing lipophagy flux and promoting lipid droplets accumulation. Molecular docking indicated comparable binding affinity of 6:2 Cl-PFAES and PFOS to SIRT1 (−10.4 kcal/mol), and further research demonstrated that 6:2 Cl-PFAES reduced the deacetylation activity of SIRT1. Crucially, Sirt1 overexpression in transgenic mice (Sirt1TG) or pharmacological activation of SIRT1 (SRT1720) and RAB7 (ML-098) rescued testosterone synthesis and restored lipophagy flux. This study identifies the SIRT1–FOXO1–RAB7 axis as a core target for 6:2 Cl-PFAES-induced suppression of testosterone biosynthesis via lipophagy dysregulation, providing critical molecular insights for assessing the reproductive risks of PFOS alternatives.
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PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Tengjiao Fan,Lin Shen,Yaxin Huang,Xin Wang,Lijiao Zhao,Rugang Zhong,Peng Wang,Guohui Sun
Lung cancer ranks as the second most diagnosed cancer and the leading cause of cancer-related deaths worldwide. Novel chemotherapeutic strategies are crucial to efficiently target tumor cells while minimizing toxicity to normal cells. In this study, we proposed a combination strategy using energy blocker lonidamine (LND) and cytotoxic drug nimustine (ACNU, 1-[(4-amino-2-methyl-5-pyrimidinyl)methyl]-3-(2-chloroethyl)-3-nitrosourea) to enhance the killing of a human lung cancer cell line and investigated the potential chemo-sensitizing mechanism of LND. LND was found to remarkably increase the cytotoxicity of ACNU to A549 and H1299 cells without significantly affecting normal lung BEAS2B cells. The combination of LND and ACNU also produced significant effects on cell apoptosis, colony formation, cell migration, and invasion assays compared to single drug treatment. Mechanistically, LND decreased intracellular ATP levels by inhibiting glycolysis and inducing mitochondrial dysfunction. Furthermore, the combination of LND and ACNU could intensify cellular oxidative stress, decrease cellular GSH contents, and increase reactive oxygen species (ROS) production. Notably, LND alone dramatically downregulated the expression of DNA repair protein MGMT (O6-methylguanine-DNA methyltransferase), enhancing DNA interstrand cross-link formation induced by ACNU. Overall, LND represents a potential chemo-sensitizer to enhance ACNU therapy through energy inhibition, disrupting redox homeostasis and downregulating MGMT expression in human lung cancer cell line under preclinical and clinical background.
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PubMed
高影响因子
HYDROMETALLURGY
·
2024
·
IF 4.8
Xinyu Cheng,Dong Shi,Yuze Zhang,Xiaowu Peng,Shaolei Xie,Lijuan Li,Yong Niu,Yuxuan Wang,Fugen Song
Cesium is an important strategic resource, and solvent extraction is the most frequently used technology for its extraction from various minerals and brines. However, this common method faces operational and cost problems owing to large alkali consumption. A synergistic extraction system consisting of 4- tert -butyl-2-(α-methylbenzyl) phenol (t-BAMBP) and di-(2-ethylhexyl) phosphoric acid (D2EHPA) was designed and used to extract Cs + from an alkali-free solution. The effects of variables such as: (i) pH, (ii) concentration of t-BAMBP and D2EHPA, (iii) temperature, (iv) Cs + concentration, and (v) coexisting cations, on the Cs + extraction performance of the synergistic system were investigated. The most suitable organic phase composition was 1.0 mol/L t-BAMBP and 0.1 mol/L D2EHPA in kerosene, and the synergistic coefficient was up to 57 at 25 °C and an organic/aqueous phase volume ratio of 1/1. The extraction sequence of cations using the t-BAMBP–D2EHPA synergistic system followed the descending order Cs + > Rb + > Ca 2+ > K + > Li + > Mg 2+ > Na + . The chemical formula of the extracted species was determined as [CsA(HA)(ROH) 2 ] using the slope method. The Cs + extraction process is an exothermic reaction with an enthalpy ( ΔH o ) of −55.3 kJ mol −1 , confirmed by the thermodynamic study. After three-stage countercurrent extraction, the extraction efficiency of Cs + was 92.6%, demonstrating excellent selectivity from coexisting cations. The t-BAMBP–D2EHPA synergistic system showed outstanding economic and environmental advantages and a good application prospect to develop a conceptual process flowsheet for extraction with this system and stripping with HCl to separate cesium salt from salt-lake brine.
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