Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4614-4623
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IF 7.779
Feixiang Wang,Yun Yang,Congcong Jin,Shilie Pan
A new borate, Li6.58Na7.43Sr4(B9O18)(B12O24)Cl (LNSBOC), was successfully obtained via a spontaneous crystallization method in an open system. LNSBOC crystallizes in a hexagonal crystal system with the centrosymmetric space group of P63/m, with a = 9.3046(2) Å, c = 24.3239(7) Å and Z = 2. According to the statistics, the structure of LNSBOC is extraordinary not only because of the discovery of the novel fan-like fundamental building block B9O18, but also for the unprecedented coexistence of the largest two highly polymerized (number of B atoms more than six) isolated B–O clusters in the structure. A discussion about the cause of the rareness of borates containing two polymerized isolated B–O clusters was carried out by investigating previous research and extant compounds. Even more significantly, a strategy to design compounds/crystal structures containing two polymerized isolated B–O clusters is put forward in this work from the viewpoint of structures and elements. In addition, thermal analysis and infrared and UV–Vis–NIR diffuse reflectance spectroscopy were performed for the title compound.
研究领域:
材料科学
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无机化学
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晶体学
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功能材料
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结构化学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2013
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IF 1.304
Qi SONG,Jiaying CAI,Junjie ZHANG,Weiqiang YU,Feng WANG,Jie XU
Phenethyl phenyl ether (PPE) was selected as a typical lignin model compound and hydrogenated and cleaved over two readily accessible nickel-based catalysts, which could be easily separated from the product mixture. The results revealed that the reduction of the nickel catalyst with gaseous hydrogen produced a species capable of achieving higher activity towards C-O-C bond cleavage compared to the Ru/C and Pd/C catalysts. The selectivity of the C-O-C bond cleavage over the Ni/C catalyst was 85%, and higher than the corresponding values in the Ru/C (40%) and Pd/C (69%) systems. Using the carbothermal reduction method for the production of the Ni/C-C catalyst, the conversion and selectivity levels reached 99%, with 40% of the benzene rings in PPE being reserved. In comparison, no benzene ring containing products wer observed over the noble metal catalysts. This difference was attributed to the interaction between the carbon support and the nickel nanoparticles. 摘要 研究了Ni基催化剂上木质素模型化合物苯基苯乙醚中C–O–C键加氢裂解性能. 结果表明, 14;Ni/C催化剂显示出优异的加氢裂解能力, 14;苯基苯乙醚的转化率达到99%以上. Ni/C催化剂的还原方法对裂解选择性有重要影响; 氢气还原制备的Ni/C-H催化剂上, 14;C–O–C键裂解选择性为85%. Ru/C和Pd/C催化剂上裂解选择性分别为40%和69%. 采用碳热还原方法制备的Ni/C-C催化剂, 14;可以实现高选择性加氢和裂解, 14;C–O–C键裂解选择性达到99%以上, 14;其中芳烃化合物收率为44%. 这可能与镍组分和载体碳之间的相互作用有关.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
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IF 5.5
Ai-Hui Cao,Xin-Tai Su,Min Zhang,Qi-Long Zhu
Photocatalytic water decomposition is a cost-effective way to convert sustainable solar energy into chemical energy. While semiconductor photocatalysis has generated considerable interest in photocatalytic hydrogen evolution, it is hampered by fast electron–hole complexation and suboptimal efficiency. Herein, an NH2-MIL-101(Cr)/doped-C3N4 heterojunction possessing a static internal electric field (IEF) is successfully prepared, characterized, and assessed for photocatalytic hydrogen production. The optimized photocatalytic H2 evolution rate of the resultant NH2-MIL-101(Cr)/O–C3N4 is 460 μmol g–1 h–1 under visible light, with an AQY of 2.5% at 450 nm. Spectral evidence indicates that the static IEF facilitates rapid electron transfer from NH2-MIL-101(Cr) to O–C3N4, achieving efficient photogenerated charge separation and a consequent significant enhancement in catalytic activity. This work not only presents a case of construction of an IEF through assembling NH2-MIL-101(Cr) with O–C3N4 but also deepens the insight of the rudimentary mechanisms of the static IEF in heterojunctions for photocatalytic hydrogen evolution.
研究领域:
材料科学
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化学
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能源技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 37
·15032-15038
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IF 5.7
Haoran Wang,Jiahao Jiao,Abudukadi Tudi,Shilie Pan,Min Zhang
Two borates, K3Al2B11O21 (KABO) and K3Al2MoB9O21 (KAMBO), with edge-sharing [BO4] (ES-[BO4]) tetrahedra and different B–O configurations in one structure, were rationally designed and prepared at atmospheric pressure by introducing covalent tetrahedra. KABO is the first borate identified to have ES-[BO4] tetrahedra and two different dimensional B–O groups, namely, isolated [B6O12] groups with ES-[BO4] and one-dimensional infinite chains. In addition, KAMBO is a rare borate that features ES-[BO4] tetrahedra and two distinct isolated B–O groups ([B6O12] and [B3O6]). The discovery of these two compounds not only enriches the structures of borates, but also suggests a novel method for creating borates with ES-[BO4] tetrahedral structures and flexible B–O configurations at atmospheric pressure.
研究领域:
材料科学
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晶体化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Yong-Long Li,Yu-Min Leng,Yu-Jie Zhang,Tian-Hua Li,Zhe-Yu Shen,Ai-Guo Wu
A simple and reliable colorimetric detection system based on anti-aggregation of gold nanoparticles (AuNPs) is proposed for rapid detection of Hg 2+ with high selectivity and sensitivity. O -phenylenediamine (OPD) can cause the aggregation of AuNPs due to formation of the strong covalent NH Au bond, and then induce color change of the AuNPs solution from red to blue. However, in the presence of Hg 2+ , OPD prefers to combine with Hg 2+ rather than AuNPs resulting in inhibition of the color change. Based on the anti-aggregation mechanism, Hg 2+ can be detected by observing the color change of AuNPs solution containing OPD. After optimization, the selectivity of this Hg 2+ detection system by the naked eyes and UV–vis spectra is excellent comparing with other ions. The limit of the detection (LOD) is 0.1 μM by the naked eyes and 5.0 nM by UV–vis spectroscopy, which is lower than the mercury toxic level (10 nM) defined by US Environmental Protection Agency. It's a good linear relationship between A 520 / A 680 and Hg 2+ concentration from 0.01 μM to 2.0 μM, which is used for the quantitative assay of Hg 2+ . The applicability of our detection system is also verified by analysis of Hg 2+ in tap water and lake water.
研究领域:
分析化学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Hao Wu,Tianyi Jiang,Wenlong Wu,Shanguo Zhang,Ming Li,Jingzhuo Zhou,Mengya Zhu,Juzheng Chen,Ziyong Li,Yang Lu,Hongyuan Jiang
Water-in-oil-in-water (W/O/W) double emulsion droplets are a typical colloidal system applied in various practical fields. However, certain high-specification applications necessitate exact geometric homogeneity in terms of both shell diameter and thickness. Despite achieving uniformity in shell diameter, on-chip microfluidic emulsification always leads to an eccentric phenomenon due to innate density differences of the droplet solution. At the same time, the current regulation methods have multiple limitations, including their applicability, regulatory scope, and objective restrictions. Herein, we propose an off-chip osmosis-induced hydrodynamic method to accurately regulate the eccentricity of W/O/W double emulsion droplets. The rational selection of hypertonic osmosis can energize the droplets and induce inward transmembrane water flux. This flow helps to reposition the droplet core to align concentrically with the shell, regardless of the initial dimension and eccentricity of the droplets. As the osmotic induction reduces due to the dilution of the inner solute molar concentration , the optimal droplet configuration can be achieved when osmosis-induced hydrodynamic regulation sufficiently counteracts the adverse effects of droplet solution density difference. The microcapsules can thus be produced by instant UV polymerization of the regulated double emulsion droplets, and the silica microspheres with fine geometric homogeneity can be prepared through further heat treatment, which is expected to meet the stringent morphological requirements in practical applications.
研究领域:
胶体与界面化学
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微流控技术
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生物材料
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药物递送系统
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高分子科学
✓ 已验证
DOI
高影响因子
MOLECULAR NUTRITION & FOOD RESEARCH
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2013
·Vol. 57
·期 5
·877-885
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IF 4.31
Zhong-Jian Chen,Yan-Qing Dai,Si-Si Kong,Fei-Feng Song,Li-Ping Li,Jian-Feng Ye,Ru-Wei Wang,Su Zeng,Hui Zhou,Hui-Di Jiang
Scope The study aimed to investigate the regioselectivity of methylation of luteolin (3′,4′,5,7-tetrahydroxyflavone) in human in vitro and in vivo. Methods and results Recombinant human catechol- O -methyltransferase (COMT) and human liver S9 were utilized to study the kinetics of meta (3′)- and para (4′)- methylation of luteolin, and urine samples from volunteers after giving a luteolin-containing formulation were collected to determine the ratio of para-/meta-production. The results showed luteolin favored a para-methylation, with a ratio of of para-/meta-production in CL int (1.43 in recombinant human COMT and 1.47 in human liver S9), which was contrary to the known substrates of COMT. However, the result of urine sample assay showed a preference of meta-methylation with a ratio of of para-/meta-production (0.460 ± 0.126). To elucidate the mechanism for different preference of methylation of luteolin in vitro and in vivo, metabolism stability of the meta- and para-methylated luteolin was evaluated in human liver microsomes and recombinant human CYP450s, which revealed that para-methylated luteolin was more easily demethylated by human CYP1A2 and CYP3A4/5 than meta-methylated luteolin. Conclusion Luteolin was a rare substrate of human COMT favoring a para-methylation, but further demethylation by human CYP1A2 and CYP3A4/5 caused a preference of accumulation in meta-methylated luteolin in vivo.
研究领域:
药理学
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生物化学
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分子生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Jianyun Yang,Yaoxing Xiang,Jisheng Xu,Chengxiang Shi,Lun Pan,Xiangwen Zhang,Ji-Jun Zou
Oxidative desulfurization (ODS) is a promising technology for removing sulfur compounds from fuel oil under mild conditions. This study prepared Ti/MCM-41 catalyst using a simple adsorption-hydrolysis-argon calcination method and applied it to ODS. Carbon introduced by tetrabutyl titanate (TBOT) and generated by calcination in inert atmosphere restrains the growth of TiO 2 , thereby promoting the formation of a high-activity Si-O-Ti structure. By using the optimal Ti/MCM-41 catalyst, desulfurization rate of model oil (dibenzothiophene dissolved in decalin, 500 ppm of sulfur) as high as 99.8 % was achieved at 40 °C with methanol as extractant and H 2 O 2 as oxidant (O/S = 4). After six recycles, the S removal rate was still 97.9 %. Reaction conditions like reaction temperature and extractant were carefully analyzed to explore the active structure and reaction mechanism, deducing that Si-O-Ti species promote the reaction probably by forming highly active bis-hydroperoxo Ti species with five-membered ring structure. Moreover, the promotion of methanol effect was found and reasonably explained. This work provides important guidance to the design of new catalysts, selection of extractant and optimization of oxidant for more efficient phase-transfer extractive and catalytic oxidation desulfurization (ECODS) process.
研究领域:
催化化学
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环境工程
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化学工程
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Han Xu,Qin Yang,Mingjiao Tian,Yaruo Zhao,Dong Guo,Zeyu Jiang,Yanfei Jian,Yadi Wang,Fan Dang,Chunli Ai,Jialei Wan,Reem Albilali,Chi He
Revealing the mechanism behind active oxygen species in chlorinated volatile organic compounds (CVOC) destruction is crucial but challenging. Herein, we designed a chromium-substituted titanium bimetal catalyst with strengthened element interaction, exhibiting remarkable ability to activate oxygen and destroy intermediates. Encapsulated chromium species triple the electron transfer speed (Cr → TiO 2 ), converting 90 % of vinyl chloride at 244 °C. The constructed Cr 6 + −O−Ti 3+ structure distorts TiO 2 lattice, generating defects that promote oxygen species activation. In-situ technologies and DFT calculations demonstrate that vinyl chloride adsorbed at Cr 6+ =O sites is oxidized by lattice oxygen, forming C O species, while surface oxygen activates in a cyclic process, promoting the *CH 2 CH to *CH 2 CHO and CH 2 CO. The constructed Cr-O-Ti structure breaks the rate-limiting step of *CH 2 CHO to CH 2 CO process, accelerating the formation of *CH 3 CO and further promoting the deep oxidation process (*CHO + *CO). This work presents new findings towards CVOC highly efficient purification, showcasing significant application potential.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Hao Wu,Peng-rui Du,Xiao-ran Miao,Rui-quan Hou,Sheng-nan Li,Muhammad Zeeshan,Jin-cheng Liu,Su-qing Huang,Dong-mei Cheng,Han-hong Xu,Zhi-xiang Zhang
Water stress, a significant abiotic stressor, significantly hampers crop growth and yield, posing threat to food security. Despite the promising potential of nanoparticles (NPs) in enhancing plant stress tolerance, the precise mechanisms underlying the alleviation of water stress using O -Carboxymethyl chitosan nanoparticles ( O -CMC-NPs) in maize remain elusive. In this study, we synthesized O -CMC-NPs and delved into their capacity to mitigate water stress (waterlogging and drought) in maize seedlings. Structural characterization revealed spherical O -CMC-NPs with a size of approximately 200 nm. These NPs accumulated near the seed embryo and root tip, resulting in a substantial increase in fresh and dry weights. The application of O -CMC-NPs to water-stressed maize seedlings remarkedly elevated the chlorophyll content and activity of various antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and polyphenol oxidase (PPO). The malondialdehyde (MDA) content was significantly reduced compared to the untreated control. Additionally, the expression of stress-responsive genes, such as ZmSOD , ZmCAT, ZmPOD , ZmTIFY , ZmACO , ZmPYL2 , ZmNF-YC12, and ZmEREB180 , were significantly upregulated in the O -CMC-NPs treated seedlings. These findings unveil the novel role of O -CMC-NPs in enhancing plant stress tolerance, suggesting their potential application in safeguarding maize seedlings under water stress conditions and facilitating the recovery from oxidative damage.
研究领域:
农业科学
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植物生理学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yinhui Feng,Zhaoguo Liu,Rixin Liu,Shuqi Kang,Shuyuan Zhang,Xin Guo,Shiyong Chu,Shaohua Guo
Layered transition-metal oxides are recognized for their substantial potential as cathode materials for sodium-ion batteries (SIBs), particularly in the context of large-scale energy storage systems. O′3-NaMnO2 (NMO) has received considerable attention due to its cost-effectiveness, high capacity, and adequate initial sodium content. However, its practical application is hindered by issues, such as Jahn–Teller distortion and the migration of Mn during cycling, which result in severe irreversible phase transitions and structural collapse. In this study, the entropy strategy was employed to synthesize O′3-NaMn0.8Mg0.06Ti0.06Fe0.04Al0.04O2 (NMO-MTFA), which not only stabilized the crystal structure but also enhanced both the bulk and surface/interface kinetics. NMO-MTFA delivers a high initial discharge capacity of 190 mA h g–1 and demonstrates a superior cycling performance and rate capability. The stabilization of the crystal structure is further reinforced by the strengthened Mn–O interaction, achieved through the trace doping of multiple elements. This research underscores the efficacy of the entropy strategy in optimizing the performance of layered oxide cathodes, thereby presenting a novel approach for the design of high-performance SIBs.
研究领域:
材料科学
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电化学
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能量存储
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Hong Jiang,Hang Zhu,Zhenchen Tang,Jiuxuan Zhang,Zhengyan Qu,Weihong Xing,Rizhi Chen
The green production process of o-methylcyclohexanol is particularly important due to its widespread industrial applications. Addressing the issue of low mass transfer efficiency of hydrogen in traditional liquid-phase hydrogenation processes, multichannel ceramic membranes as hydrogen dispersion tools are introduced, successfully achieving uniform and efficient dispersion of hydrogen in the o-cresol cyclohexane solution, thereby promoting the efficient hydrogenation of o-cresol to o-methylcyclohexanol within a fixed-bed reactor. The results show that compared to conventional single-tube feeding methods, the introduction of ceramic membranes significantly enhances the o-cresol conversion and o-methylcyclohexanol selectivity. By optimizing the pore size (200 nm), channel number (19 channels) of the ceramic membranes, and operating conditions, o-cresol conversion and the o-methylcyclohexanol selectivity of no less than 99.5% are achieved under optimal operating conditions. Furthermore, a macro-kinetic model for the membrane-dispersion-enhanced liquid-phase hydrogenation of o-cresol is established, which incorporates an empirical equation for hydrogen solubility. Validation results show that the model-calculated reaction rates of o-cresol are highly consistent with experimental data, with errors controlled within 5%, providing theoretical support for the precise regulation of experimental operating conditions. The work offers a new strategy for the green production of o-methylcyclohexanol.
研究领域:
化学工程
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环境科学
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催化反应工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）