APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yingyue Hu,Xinyao Hu,Lu Xue,Baolong Cui,Yi Du
The modulation of crystal surface is one of the important means of photocatalyst modification. BiOBr photocatalyst with exposed (1 1 0) facets was synthesized at room temperature and pressure using CaCO 3 as a directing agent in this experiment. The addition of CaCO 3 not only promoted the exposed facets of BiOBr from (1 0 2) to (1 1 0), but also improved its ability of photocatalytic degradation of pollutants, meanwhile, changed the specific surface area of BiOBr, provided more active sites, and enhanced the adsorption capacity of BiOBr. At the same time, the effects of different alkaline earth metals on the performance of BiOBr photocatalytic materials were compared, it was determined that the degradation rate of RhB of BiOBr photocatalyst reached 97% within 60 min when adding 500 wt% CaCO 3 , and the main active group in the degradation experiment was h + . In conclusion, BiOBr with different main exposed facets was prepared in this paper, and a new idea was provided for alkaline earth metals in the field of photocatalysis.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhang Xiaoping,Chingin Konstantin,Zhong Dacai,Liang Juchao,Ouyang Yongzhong,Chen Huanwen
1-Pyrroline has a highly characteristic odor, which is employed by living organisms for chemical signaling and other purposes, but the mechanism whereby this odor is formed remains poorly understood. Here we used a combination of ambient mass spectrometry (AMS) and nuclear magnetic resonance (NMR) spectroscopy to experimentally address the mechanistic aspects of 1-pyrroline volatility and other controversies regarding the chemistry of this compound. Our results indicate that in solution the volatility of the monomer species is significantly higher than that of the trimer species, and 1-pyrroline is evaporated mainly in its monomer state. Neat 1-pyrroline is essentially the pure trimer and displays ca. 100-fold lower evaporation rate than the monomer state in solution. In the gas-phase the trimer species is irreversibly decomposed into monomer species. Under equilibrium conditions the vapor of 1-pyrroline entirely consists of monomer species. The evaporation rate of 1-pyrroline in water has a step-wise dependence on the solution pH, the abrupt increase in volatility (>1,000-fold) occurring around the pKa value of 1-pyrroline (6.8). The pronounced step-wise dependence of 1-pyrroline volatility around neutral pH may also be an important evolutionary factor allowing living systems to regulate the odor strength from very weak to very strong with minimal efforts.
研究领域:
分析化学
·
物理化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 9
·2813-2823
·
IF 2.936
Yang Jian,Li Xuemei,Zhang Jia,Tian Junying,Yao Xiaolan,Liu Hailong,Xia Chungu,Huang Zhiwei
Valuable 5-amino-1-pentanol (5-AP) was efficiently synthesized from biomass-derived dihydropyran over hydroxylapatite nanorod supported Ni catalysts (Ni-HAP), by coupling the in situ generation of 5-hydroxypentanal (5-HP, via the ring-opening tautomerization of 2-hydroxytetrahydropyran (2-HTHP)) and its subsequent reductive amination. The Ni-HAP catalyst with 10 wt% Ni loading exhibited the highest 5-AP yield than the other Ni-HAP catalysts with different Ni loadings and several commercial hydrogenation catalysts, including Ru/C, Pt/C and Pd/C, as well as Raney Ni. High Ni particles dispersion, high reducibility and acidic intensity were found to account for the superior catalytic performance of 10Ni-HAP. The effect of reaction parameters on the catalytic performance was investigated, and an excellent 5-AP yield of 92% was achieved under mild reaction conditions of 80 °C and 2 MPa H 2 . The stability of the Ni-HAP catalyst was studied using a continuous flow reactor, and the sintering of Ni nanoparticles was considered as the major reason for the decline in hydrogenation activity. Graphical Abstract The Ni-HAP catalyst exhibited high catalytic performance to synthesis 5-AP due to the high Ni particles dispersion, reducibility and acidic intensity.
研究领域:
催化化学
·
可再生化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Shuangqi Song,Hong Li,Jingde Li,Yanqin Yang
Mixed-matrix membranes (MMMs), developed through the combination of solid fillers with polymer matrices, represent an effective approach addressing the persistent challenge of balancing permeability and selectivity in polymer membrane. Diethylenetriamine-functionalized porous material of PP-DETA, which is synthesized from porous organic polymer of PP via one-step diethylenetriamine grafting, is an ideal material for MMMs production. However, designing and optimizing PP-DETA for high-performance CO 2 separation membranes remains a challenge. Herein, we develop an improved PP-DETA material, designated as PP-DETA-cPIM-1, by covalently attaching a carboxylated polymer of intrinsic microporosity (cPIM-1) network layer onto the PP-DETA surface. Membranes prepared from this PP-DETA-cPIM-1 filler and PIM-1 matrix demonstrate enhanced interfacial adhesion and stronger mechanical properties in comparison to the counterparts with the same loading of PP-DETA. The incorporation of PP-DETA-cPIM-1 into MMMs establishes an enhanced filler/polymer interface that facilitates the selective transport of CO 2 through the filler, while simultaneously improving membrane stability and suppressing physical aging. Specifically, with 5 wt% loading of PP-DETA-cPIM-1 filler, the MMM is able to enhance the CO 2 /N 2 selectivity and CO 2 permeability by 52.3 % and 25.3 %, respectively, exceeding the upper bound established in 2008. Furthermore, PP-DETA-cPIM-1/PIM-1 MMMs display superior anti-aging ability for 180 days of aging.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Xiaojie Wang,Xiaopo Wang,Dongbo Wang
Densities and kinematic viscosities of binary mixtures for ethyl caprate with 1-propanol, 1-butanol, and 1-pentanol were measured at temperatures from 283.15 K to 318.15 K and at ambient pressure (0.1 MPa) over the entire composition range. Excess molar volumes and viscosity deviations of the mixtures were derived from the experimental data and correlated using the Redlich–Kister equation. In addition, viscosities were correlated using the McAllister three-body model, whereas densities were fitted to a third-order polynomial as a function of temperature and mole fraction.
研究领域:
物理化学
·
热力学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Hao Wang,Nianzu Zhang,Xiaopo Wang
In this work, the density and viscosity data for binary mixtures of dimethyl carbonate with 1-heptanol, 1-octanol, 1-nonanol, and 1-decanol were presented from 303.15 K to 333.15 K at atmospheric pressure over different concentration ranges. The density and viscosity measurement was carried out based on the vibrating-tube densimeter and Ubbelohde capillary viscometer, respectively. Derived properties, such as excess molar volumes and viscosity deviations, were calculated from the experimental values, and were correlated based on the Redlich-Kister equation. In addition, excess molar volumes and viscosity deviations of the studied mixtures were analyzed and compared with other DMC/1-alcohols mixtures reported in the literatures.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-9
·
IF 5.479
Xue Jin-Hua,Liu Ling,Wang Yong-Sheng,Li Jia-Qian,Li Mei,Qu Yue-Ning,Li Le
This work describes a method for the determination of 1-hydroxypyrene (OH-Py) via aggregation-induced quenching of the emission of protamine-coated gold nanoclusters using 9-hydroxyphenanthrene (OH-Phe) as a sensitizer to boost the emission efficiency of nanoprobe. Under optimum conditions, the drop in fluorescence intensity at excitation/emission wavelengths of 300/596 nm is proportional to the concentrations of OH-Py in the range from 1.0 to 65 nM. The relative standard deviations are 4.2, 2.4 and 1.9% (for n = 11) at concentration levels of 8.0, 32 and 48 nM of OH-Py, respectively. The detection limit is 0.3 nM which is much lower than that of some previously reported methods. The recoveries from urine samples spiked with OH-Py ranged between 94.4 and 98.8%.
1-Hydroxypyrene (OH-Py) can trigger the aggregation of protamine-gold nanoclusters (PRT-AuNCs), resulting in the emission quenching of PRT-AuNCs. 9-Hydroxyphenanthrene (OH-Phe) can boost the emission efficiency of nanoprobe. Thereby, a highly sensitive assay of OH-Py was established.
研究领域:
分析化学
·
环境医学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIGESTIVE DISEASES AND SCIENCES
·
2022
·Vol. 67
·期 10
·4780-4796
·
IF 3.487
Duan Houyu,Ding Xiang,Luo Hesheng
Background and Aims KISS-1 is an established tumor suppressor that inhibits metastases in various malignancies. However, little is known regarding its role in esophageal squamous cell carcinoma (ESCC). The aim of the present study was to identify the possible mechanisms of KISS-1 in ESCC metastasis. Methods The expression levels of KISS-1 mRNA and protein in ESCC samples and cell lines were analyzed by qRT-PCR, IHC, and western blotting. Bisulfite sequencing PCR (BSP) and methylation-specific PCR (MSP) were used to analyze the methylation pattern of KISS-1 promoter in ESCC cells with or without 5-Aza-dC treatment. The role of KISS-1 in the progression and metastasis of ESCC was analyzed through in vitro functional assays. Results KISS-1 mRNA and protein were markedly downregulated in ESCC tissues and cell lines compared to the respective controls. Hypermethylation of KISS-1 promoter correlated to its lower expression levels in ESCC, and KISS-1 demethylation inhibited tumor progression. Ectopic KISS-1 overexpression inhibited tumor cell metastasis in vitro. In addition, KISS-1 overexpression downregulated the matrix metalloproteinase 2 and 9 (MMP2 and 9) and inhibited epithelial–mesenchymal transition (EMT). Finally, KISS-1 downregulated phosphorylated extracellular regulated protein kinase 1/2 (ERK1/2) and phosphorylated p38 mitogen-activated protein kinase (MAPK) without affecting their total expression levels in the ESCC cells. MAPK/ERK and p38 MAPK agonists reversed the suppressive effects of KISS-1. Conclusions The hypermethylation of KISS-1 promoter partly contributed to its downregulation in ESCC. KISS-1 inhibits the metastasis of ESCC cells by targeting the MMP2/9/ERK/p38 MAPK axis.
研究领域:
肿瘤学
·
分子生物学
·
癌症遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2011
·
IF 0.901
Dongshun DENG,Rufa WANG,Lianzhong ZHANG,Yun GE,Jianbing JI
Vapor-liquid equilibrium (VLE) data were measured for ternary system water + ethanol + 1-butyl-3-methylimidazolium acetate ([bmim][OAc]), in a relatively wide range of ionic liquid (IL) mass fractions up to 0.8. Six sets of complete T - x - y data were obtained, in which the mole fraction of ethanol on IL-free basis was fixed separately at 0.1, 0.2, 0.4, 0.6, 0.8, and approximate 0.98. The non-random-two-liquid (NRTL) and electrolyte non-random-two-liquid (eNRTL) equations were used for correlation, showing similar deviations. The ternary VLE was also modeled with the correlation from two data sets, with the mole fractions of ethanol on IL-free basis being 0.1 and approximate 0.98. The VLE data were also reproduced satisfactorily. With the eNRTL model, the root-mean-square deviation for temperature is 0.79 K and that for vapor-phase mole fraction is 0.0094. The calculations are in good agreement with experimental data. The effect of the IL on the VLE behavior of the volatile components is also illustrated.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 11
·2413-2421
·
IF 3.637
Wang Xia,Zhang Yawen,Zhao Liying,Wang Dazhong,Yang Huaixia,Kong Jinming
An ultrasensitive fluorescence biosensor for detecting cytokeratin fragment antigen 21-1 (CYFRA 21-1) DNA of non-small cell lung carcinoma (NSCLC) is designed using polysaccharide and activator regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) signal amplification strategy. Thiolated peptide nucleic acid (PNA) is fixed on magnetic nanoparticles (MNPs) by a cross-linking agent and hybridized with CYFRA 21-1 DNA. Hyaluronic acid (HA) is linked to PNA/tDNA heteroduplexes in the form of carboxy-Zr 4+ -phosphate. Subsequently, multiple 2-bromo-2-methylpropionic acid (BMP) molecules are linked with HA to initiate ARGET ATRP reaction. Finally, a large number of fluorescein o-acrylate (FA) monomers are polymerized on the macro-initiators, and the fluorescence signal is significantly amplified. Under optimal conditions, this biosensor shows a significant linear correlation between the fluorescence intensity and logarithm of CYFRA 21-1 DNA concentration (0.1 fM to 0.1 nM), and the limit of detection is as low as 78 aM. Furthermore, the sensor has a good ability to detect CYFRA 21-1 DNA in serum samples and to recognize mismatched bases. It suggests that the strategy has broad application in early diagnosis by virtue of its high sensitivity and selectivity.
A novel and highly sensitive fluorescence biosensor for quantitatively detecting CYFRA 21-1 DNA via dual signal amplification of hyaluronic acid and ARGET ATRP reaction was developed. This proposed method has a low detection limit, wide detection range, high selectivity, and strong anti-interference.
研究领域:
生物技术
·
癌症研究
·
纳米技术
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 10
·e202203687
·
IF 2.1
Min Zhang,Shenyong Ren,Qiaoxia Guo,Baojian Shen
Graphical Sheet-like zeolite TS-1 was synthesized under hydrothermal conditions by adding seed and urea. Liquid seed and pre-crystallization could adjust thickness of sheet-like sample in b-axis direction. Epoxidation of 1-hexene with H 2 O 2 catalyzed by sheet-like TS-1 gave high selectivity of 1,2-epoxyhexane. In zeolite TS-1, the straight channel parallelled to the b-axis direction has larger pore size and thus is main diffusion channel for molecules. Shorter b-axis brings about shorter diffusion channel, which can leads to higher adsorption and diffusion rate. Therefore, with regard to the morphology modification of MFI zeolites, many studies touch on short b-axis zeolites have been reported. Unfortunately, most of the preparation processes require harsh synthesis conditions and complex organic templates, and they are not conducive to large-scale applications. In this work, cheap organic additive urea and seed crystals were added to synthesize sheet-like TS-1, which boasts short b-axis. At the same time a pre-crystallization was performed at the aging solution stage. In the b-axis direction, the zeolite TS-1 prepared in this way had a minimum thickness of about 50 nm. This is because urea can inhibit the growth of crystals in the b-axis direction, and the guiding effect of the seed liquid also plays the function of adjusting the b-axis thickness. In the epoxidation of 1-hexene with H 2 O 2 when catalyzed by sheet-like TS-1, the selectivity of the target product 1,2-epoxyhexane was significantly improved.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Wenyang Fan,Yuanyuan Han,Houchun Yan,Dongmei Xu,Huiwen Huang,Yinglong Wang
To recover isopropanol from its aqueous solution, alkanols (1-pentanol, 1-hexanol and 1-heptanol) were selected as the solvents to separate water and isopropanol. Liquid-liquid equilibrium data for water + isopropanol + 1-pentanol/1-hexanol/1-heptanol ternary systems were measured at 298.15 K under 101.3 kPa. The mass conservation of the experimental data was checked, and the reliability of the tie-lie data were evaluated by the Bachman, Hand and Othmer-Tobias equations. The extraction performance of the three solvents was assessed through the separation factor and partition coefficient, and compared with those for other reported solvents {esters, ketones, ethers, alkanes (or alkenes), ionic liquids and deep eutectic solvents}, indicating that 1-heptanol has better extraction performance for isopropanol compared with other two solvents. The NRTL and UNIQUAC models were used to correlate the data to obtain regression parameters. The mixed surface analysis based on Gibbs energy topology verified that the binary interaction parameters are consistent with the measured data. Furthermore, the LLE binodal curve for the researched ternary systems were predicted through the UNIFAC and COSMO-UNIFAC models.
研究领域:
化学工程
·
物理化学
·
热力学
✓ 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）