CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2019
·Vol. 32
·期 3
·306-312
·
IF 0.791
Yu Ye-peng,Li Zhao-hui,Lin Xuan,Chen Jun,Zhang Hang,Li Yan-bo,Wang Huang-huang,Sun Rui-rui,Meng Qing-hui,Shan Xiao-bin,Liu Fu-yi,Sheng Liu-si
The photoionization and dissociation of 2-methyl-2-propen-1-ol (MPO) have been investigated by using molecular beam experimental apparatus with tunable vacuum ultraviolet synchrotron radiation in the photon energy region of 8.0–15.5 eV. The photoionization efficiency (PIE) curves for molecule ion and fragment ions: C 4 H 8 O + , C 4 H 7 O + , C 3 H 5 O + , C 4 H 7 + , C 4 H 6 + , C 4 H 5 + , C 2 H 4 O + , C 2 H 3 O + , C 3 H 6 + , C 3 H 5 + , C 3 H 3 + , CH 3 O + , CHO + have been measured, and the ionization energy (IE) and the appearance energies (AEs) of the fragment ions have been obtained. The stable species and the first order saddle points have been calculated on the CCSD(T)/cc-pvTZ//B3LYP/6-31+G(d,p) level. With com-bination of theoretical and experimental results, the dissociative photoionization pathways of 2-methyl-2-propen-1-ol are proposed. Hydrogen migrations within the molecule are the dominant processes in most of the fragmentation pathways of MPO.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 23
·8279-8287
·
IF 4.052
Bo Lin,Zhiping Lin,Shougang Chen,Meiyan Yu,Wen Li,Qiang Gao,Mengyao Dong,Qian Shao,Shide Wu,Tao Ding,Zhanhu Guo
An efficient hydrogen evolution reaction (HER) depends essentially on high-performing electrocatalysts. The aggregation of catalysts normally deteriorates their activity and stability. In this study, a two-step route was used to synthesize surface intercalated well-dispersed spherical MoS2xSe2(1−x) nanocatalysts. The resulting catalysts present a highly active and stable performance towards the HER with an overpotential of −143 mV at 10 mA cm−2, and a Tafel slope of 53.8 mV dec−1. The mechanism for the enhanced HER was analyzed and was attributed to three factors: (i) large numbers of defects and edge active sites arising from the coexistence of S and Se elements; (ii) enhanced electric conductivity arising from the phase transition from the semiconducting 2H-phase to metallic 1T-phase during the intercalation process; and (iii) enlarged contact areas between active sites and electrolyte caused by the increased surface roughness due to the surface intercalation. This work not only deepens our understanding of the improved HER performance of surface intercalated catalysts, but also provides novel strategies for preparing durable electrocatalysts through surface engineering.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2018
·
IF 3.118
Lang Yi,Yan-jun Lyn,Chong Peng,Rui-li Zhu,Sha-sha Bai,Liang Liu,Pei-xun Wang,Hua Zhou,Yan Dong
Fibroblast like synoviocyte (FLS) is a crucial in the pathogenesis of rheumatoid arthritis (RA), and involved in inflammation and joint destruction. Sinomenine (SIN), an alkaloid derived from the plant Sinomenium acutum , has anti-inflammatory and analgesic effect and been used for RA treatment in China. Alpha 7 nicotinic acetylcholine receptors (α7nAChR), as the key receptor in cholinergic anti-inflammatory pathway (CAP) to inhibit inflammation, has been detected in RA patients synovium , but its role is still unclear. Here we investigated the association between the aggressive proliferation of FLS and α7nAChR expression and the effect of sinomenine. FLS was isolated from synovial tissues of adjuvant-induced-arthritis (AIA) rat. Tumor necrosis factor(TNF)-α was used to induce the aggressive proliferation of FLS. MTT assay was applied to evaluate the proliferation of FLS. The messenger RNA (mRNA) and protein levels of α7nAChR and early growth response gene-1 (Egr-1) were measured. The results showed that TNF-α induced FLS proliferation in vitro (P < .01) and increased the phosphorylation of ERK1/2 and the expression of Egr-1 and α7nAChR (P < .05 or P < .01). U0126 , the inhibitor of ERK1/2 inhibited α7nAChR expression and FLS proliferation significantly (P < .05 or P < .01). Specific short interference RNA(siRNA) of α7nAChR decreased α7nAChR expression and inhibited FLS proliferation as well. SIN inhibited the proliferation of FLS and decreased the phosphorylation of ERK1/2, and the expression of Egr-1 and α7nAChR induced by TNF-α (P < .05). In conclusion, the expression of α7nAChR involved in the aggressive proliferation of FLS induced by TNF-α and was regulated by ERK/Egr-1 signal pathway . SIN inhibited FLS proliferation and α7nAChR expression through inhibiting ERK/Egr-1 signal pathway, this may contribute to the anti-inflammatory and anti-arthritic effect of SIN.
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CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Juhyok So,Cholho Pang,Hongxing Dong,Paeksan Jang,Juhyok U,Kumchol Ri,Cholyong Yun
Surface molecularly imprinting polymer (SMIP) was utilized in the removal of a residual pesticide (carbaryl (CBL)) in water and simulated fruit juice. Being the crosslinking agent, ethylene glycol dimethacrylate (EGDMA) was copolymerized with the monomer , methacrylic acid (MAA) and CBL as the template molecules on the surface of the silica gel particles to produce the SMIP adsorbents. The SMIP adsorbents showed good selectivity and good adsorption capacity for CBL in the competitive adsorptions with two structurally related carbamate pesticides . The effect of the pretreatment solvents on the adsorption capacity of the SMIP adsorbent was investigated with the results of the numerical simulations. The adsorption isotherms and the adsorption kinetics were well described by the Freundlich equilibrium model and the pseudo-second-order kinetic model, respectively. Scatchard plot analysis revealed that there were two classes of binding sites populated in the SMIP adsorbents. In addition, the good selective adsorption of CBL by the SMIP adsorbent in a simulated fruit juice containing vitamin C and fructose indicated the great potential of the SMIP adsorbents to remove residual pesticide in food industry and processing industry for agricultural products.
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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2018
·Vol. 71
·期 5
·1113-1126
·
IF 0.91
Chen Jin-ping,Zhang Xue-song
Four hydrosoluble macroazacyclic compounds, phosphorus phthalocyanine and substituent phosphorus triaza tetrabenzo corrole substituted with amino or sulfonate groups respectively, were investigated as corrosion inhibitors for mild steel in 1 mol/L HCl. The results obtained from weight loss test showed that the inhibitive efficiency of phosphorus phthalocyanine was higher than the phosphorus triaza tetrabenzo corrole; while the amino substituent phosphorus phthalocyanine showed the strongest inhibitive ability among them. The potentiodynamic tests illustrated that these inhibitors protected steel according to the mixed type mechanism on electrochemistry; while the impedance spectra revealed the increasing of charge transfer resistance and the decreasing of double layer capacitor caused by the adsorption of inhibitors. The surface analysis (XPS and SEM) proved the protection of steel surface by the adsorbed inhibitors. The molecular dynamic simulation indicated the advantages of phosphorus phthalocyanine as inhibitors associating with highly binding stability and stable adsorption configuration. The unique degradation properties of these inhibitors under visible light made them useful with environmental advantage in application.
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2024
·
IF 2.6
Xiuping Lin,Chang-sheng Shao,Shereen M. Elsherbiny,Qing Huang
Astaxanthin (AST) is a xanthophyll carotenoid with strong oxidation resistance, which can effectively scavenge various free radicals and protect organisms from oxidative damage. AST is also known to have prominent anti-aging effects, but the underlying mechanism of AST in anti-radiation aging is largely unknown. In this work, we applied ultraviolet (UV) irradiation to accelerate the aging of Caenorhabditis elegans ( C. elegans ) and treated the nematodes with AST to explore whether and how AST could attenuate the radiation-induced aging effect. Our results showed that AST improved the survival rate of C. elegans , reduced the aging biomarkers, and alleviated the mitochondrial dysfunction caused by the irradiation. Based on the transcriptome sequencing analysis, we identified that the key genes regulated by AST were involved in JNK-MAPK and DAF-16 longevity signaling pathways. Furthermore, we employed jnk-1 and daf-16 mutants and verified the role of the JNK-1/DAF-16 signaling pathway in the anti-aging effect. As such, this study has not only demonstrated that AST can resist the aging process caused by UV-irradiation but also revealed the anti-aging mechanism of AST through JNK-1/DAF-16 activation in C. elegans.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jie Zhou,Qingdi Sun,Yuhan Qin,Hao Liu,Peng Hu,Chao Xiong,Hongbing Ji
Propane dehydrogenation (PDH) has been an outstanding technique with a bright prospect, which can meet the growing global demand for propylene. However, undesired side reactions result in the deactivation of the Pt-based catalysts, which contribute to the insufficient lifetime of the catalysts. Herein, we describe a novel catalyst by encapsulating bimetallic CoCu-modified Pt species in S-1 zeolite for efficient dehydrogenation of propane, which synergizes the confinement of zeolites and the geometric and electronic effects on Pt species for enhancing the catalyst stability. The introduction of bimetallic additives efficiently promotes the dispersion of platinum and the electron transfer between Pt species and the additives, which greatly prolongs the lifetime of the catalysts. Particularly, no obvious deactivation is observed on 0.2Pt0.3Co0.5CuK@S-1 after 93 h on stream with a weight hourly space velocity (WHSV) of 5.4 h −1 , revealing an ultralow deactivation constant of 0.0011 h −1 (t = 909 h). The formation rate of propylene still maintains at a high value of 407 mol g Pt -1 h −1 (WHSV = 21.6 h −1 ) at 580 ℃ even after on pure propane stream for 42 h. The catalyst with the bimetallic CoCu-modified Pt species in S-1 zeolite reveals ultra-high activity and stability for PDH, which is ascribed to the highly dispersed Pt species and the stabilization effect of bimetallic additives on Pt species.
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CATALYSIS TODAY
·
2024
·
IF 5.2
Ruiqi Wu,Ning Liu,Chengna Dai,Gangqiang Yu,Ruinian Xu,Biaohua Chen
The propane oxidation dehydrogenation assisted by CO 2 (CO 2 -ODHP) is currently a hot research topic, not only to meet growing demand of propylene but also to favor the CO 2 neutralization. In present work, a series of CrO x @S1-n-1.0 with different Cr contents (n= 2.2, 3.6 and 4.5 wt%) is synthesized based on a small gas molecule directing synthesis strategy, wherein the gaseous CO of 1.0 MPa was in situ introduced in the synthesis system to regulate the interaction and dispersion of CrO x over silicalite-1 (S1) support. The characterization results of XRD , XPS , H 2 -TPR, and Raman indicate that the CO can affect the oxidation state and dispersion of Cr species. As observed, the Cr species were highly dispersed over CrO x @S1–3.6 %-1.0 (in the form of Cr 6+ valance state), which however would aggregate to generate Cr 2 O 3 nanoparticles over the CrO x @S1–3.6 %-0 a prepared by impregnation method in absence of CO. The activity measurement indicates that the CrO x @S1–3.6 %-1.0 possesses the highest activity by displaying an average propane conversion of 50.4 % and CO 2 conversion of 23.6 % at 600 °C, which surpasses most of the literature reports. The CO 2 -ODHP reaction mechanism was further investigated by in situ DRIFTS , which indicates that dissociated H of propane can react with CO 2 to form formate (-COOH), in turn further reacts with H to produce byproducts CO and H 2 O, and the formate species can also react with the CrO 3 active site to form bicarbonate species (HCO - 3 ). Generally, present work has proposed a small gas molecule directing strategy to adjust the dispersions and chemical states of the loaded guest meals over catalytic support. The study of present work would contribute to other highly efficient catalyst design .
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CURRENT BIOLOGY
·
2024
·
IF 8.1
Yun Chen,Xia Hua,Siyu Li,Jiamei Zhao,Huan Yu,Dongyao Wang,Jiqiang Yang,Lijun Liu
Rice paddy has been the main source of anthropogenic methane (CH 4 ) emissions, with significant variations among rice varieties. 2-Acetyl-1-pyrroline (2-AP) is the key component of the pleasant aroma in fragrant rice. Here, we show that fragrant rice is metabolically active in nitrogen assimilation and exhibits high levels of 2-AP and that CH 4 fluxes at the booting stage and cumulative emissions are 25.5% and 14.8% lower, respectively, in fragrant rice paddies compared with nonfragrant rice paddies. Three precursors involved in 2-AP synthesis—proline, glutamic acid, and ornithine—are identified as crucial nitrogen compounds that significantly promote CH 4 oxidation in the rhizosphere. Augmenting 2-AP synthesis, either through foliar spraying or by utilizing CRISPR-Cas9 technology to generate knockout lines of BETAINE ALDEHYDE DEHYDROGENASE 2 gene, effectively enhances CH 4 oxidation and reduces CH 4 fluxes. Our findings reveal that the 2-AP metabolic pathway coordinates the carbon/nitrogen cycle to improve nitrogen assimilation along with high 2-AP levels and mitigate CH 4 emissions in paddy ecosystems.
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FUEL PROCESSING TECHNOLOGY
·
2015
·
IF 3.352
Mei-Xia Zhao,Xian-Yong Wei,Meng Qu,Zhan-Ku Li,Jing Liu,Jiao Kong,Dong-Dong Zhang,Hong-Lei Yan,Zhi-Min Zong
A highly active solid acid was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto mesostructured zirconium oxide (MSZO). Di(1-naphthyl)methane (DNM) was used as a coal-related model compound to evaluate the catalytic activity of TFMSA/MSZO for cleaving strong C–C bridged bonds in coals. As a result, TFMSA/MSZO was found to be effective for hydrocracking DNM to naphthalene and 1-methylnaphthalene in cyclohexane without adding gaseous hydrogen and MSZO is a much better support than activated carbon, γ-Al 2 O 3 , and ZSM-5 zeolite . Based on the kinetic investigation, the apparent activation energy of DNM hydrocracking over TFMSA/MSZO is only 32.0 kJ·mol −1 , which is much lower than the dissociation energy (355.6 kJ·mol −1 ) of the bridged bond in DNM. The proton transfer directly from TFMSA/MSZO and/or via cyclohexane dehydrogenation over TFMSA/MSZO to the ipso -position of DNM could be the crucial step for DNM hydrocracking.
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FUEL
·
2015
·
IF 3.52
Fuping Tian,Zhikai Fu,Huan Zhang,Jianjun Zhang,Yongying Chen,Cuiying Jia
Adsorption desulfurization is one of the most promising ways to reduce the sulfur content of gasoline at deeper level. In this work, thiophene (TP) adsorption capacity in cyclohexane onto [Cu 3 (BTC) 2 (H 2 O) 3 ] (HKUST-1) was measured by batch method, and the effect of cyclohexene and toluene on sulfur capacity was investigated. Adsorption isotherms of TP, cyclohexene, and toluene in cyclohexane onto HKUST-1 were conducted at 298.15–313.15 K to explicate the different extent of influence by cyclohexene or toluene addition. The results showed that, compared with cyclohexene, the addition of toluene in model gasoline led to a moderate decline in sulfur capacity of HKUST-1. The isotherm data of TP adsorption were well-correlated using Langmuir equation, while those of cyclohexene or toluene adsorption fitted Freundlich model, indicating different adsorption mechanisms between TP and competitors. The adsorption capacities followed the order of toluene < cyclohexene ≪TP at the same equilibrium concentrations, implying the order of the adsorption affinities, which is in good agreement with the different extent of influence by cyclohexene and toluene. The excellent regeneration performance of HKUST-1 in TP adsorption benefits from the physical adsorption mechanism, which was hinted by the enthalpy of TP adsorption (−37.31 ± 2.04 kJ mol −1 ) and no detection of new sulfur species.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 13
·D707
·
IF 3.014
Jie Zhang,Maozhong An,Anmin Liu,Shanshan Ji,Ye Lian,Xuefeng Ren
Octahedral indium particles are electrodeposited on the molybdenum films from 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([Bmim][TfO]) ionic liquid. Chronoamperometry and SEM images demonstrate that the nucleation of indium on the glassy carbon electrode involves an instantaneous process. Molecular dynamic simulation reveals the interaction between [Bmim]+ and [TfO]− ion pairs and the indium surfaces, which can explain the formation of polyhedral shapes of the particles.
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危险品化学品经营许可证（带存储）