JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Chunli Zhang,Yi He,Fei Li,Haihui Di,Lei Zhang,Yingqing Zhan
A novel hybrid materials Fe 3 O 4 nanoparticles supported by hexagonal boron nitride (h-BN) is successfully prepared via mussel-inspired chemistry of dopamine by hydrothermal synthesis method. The surface modification and microstructure of h-BN-Fe 3 O 4 are characterized by FT-IR, XRD , XPS, SEM and TEM . The nano-Fe 3 O 4 obtain well dispersion supported by h-BN layer platform, and the h-BN-Fe 3 O 4 hybrid materials exhibit a remarkable superiority in enhancing the anticorrosion performance of epoxy coatings. The lamellar structural h-BN and nano-Fe 3 O 4 provide a significant synergistic effect in anticorrosion performance for epoxy composite coatings . In addition, the anticorrosion mechanisms of h-BN-Fe 3 O 4 are tentatively discussed.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Changzhou Chen,Peng Liu,Haihong Xia,Jianchun Jiang,Xiaohui Yang,Minghao Zhou
Lignin is an abundant source of aromatics with low effective hydrogen-to-carbon ratio (H/Ceff), and the depolymerization of lignin provides significant potential for producing liquid products with an improved H/Ceff value. In this work, the catalytic conversion of lignin monomers, dimer, trimers, and realistic lignin over spherical MOF-derived NiMo@C catalysts was well established, to get liquid fuels with a higher H/Ceff. The optimal ratio of the Ni4Mo1@C catalyst exhibited good hydrodeoxygenation activity and stability for the hydrotreatment of lignin model compounds and lignin. The addition of Mo facilitated the decrease of the particle size of a spherical structure, strengthened the electron-transfer capability between metals Mo and Ni, and enhanced the acid strength. All of these factors contributed to higher hydrodeoxygenation activity in the hydrotreatment process. Up to 100% conversion and 90% yields of ethylcyclohexane and cyclohexanol with H/Ceff values of 2.0 and 1.667, respectively, were obtained. The Ni4Mo1@C catalyst achieved a decrease of the oxygen element and an increase of H/Ceff and HHV values. The physicochemical characterizations were performed by various means including X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), H2-temperature-programmed reduction (H2-TPR), NH3-temperature-programmed desorption (NH3-TPD), pyridine-infrared spectroscopy (Py-IR), inductively coupled plasma emission spectrometer (ICP), and Raman and X-ray photoelectron spectroscopy (XPS) analyses, which definitely elucidated the formation of a synergistic effect between metals Mo and Ni. Additionally, a control experiment also illustrated the synergistic effect that facilitated the occurrence of the hydrotreatment process under lower temperatures after the addition of metal Mo. Based on the optimal reaction condition (240 °C, 4 h, 2.0 MPa H2), both lignin and its monomers/dimers/trimers could be effectively hydrotreated to afford liquid products with improved H/Ceff value compared to raw lignin.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2017
·
IF 3.471
Yunwu Zheng,Fei Wang,Xiaoqin Yang,Yuanbo Huang,Can Liu,Zhifeng Zheng,Jiyou Gu
The main objective of this work was to study aromatics production via the catalytic pyrolysis upgrading of biomass using metal-loaded modified H-ZSM-5. M-ZSM-5 catalysts were prepared through the impregnation method with Zn, Ga, Ni, Co, Mg and Cu. The prepared M-ZSM-5 catalysts were evaluated by x-ray diffraction, thermal desorption spectroscopy and scanning electron microscopy. The properties, composition and product distribution of bio-oil were also analysed. Results showed that the M-ZSM-5 catalysts yielded a higher amount of non-condensable gas at the expense of the liquid yields. The Ga-ZSM-5 catalysts produced the highest yields of bio-oil (25.76 wt%), but the lowest amount of coke (22.08 wt%) compared with the unmodified ZSM-5 catalyst (33.38 wt%). The content of the single-ring aromatics prepared by using the Zn-ZSM-5 catalysts was the highest at 90.28 wt%, whereas that of the polycyclic aromatic hydrocarbon prepared by the Ni-ZSM-5 catalysts was the highest at 31.36 wt%. Moreover, the selectivity of the single-ring aromatic hydrocarbons, such as C7 and C8, were significantly affected by the use of the M-ZSM-5 catalysts. The Zn-ZSM-5 catalysts were the most selective for toluene and xylenes with contents of 36.52 wt% and 35.32 wt%, respectively, whereas the Co-based catalysts were the most selective for indene. The Ni-based catalysts can obviously improve the selectivities of benzene production and C10+ polycyclic aromatic hydrocarbons. Zn-ZSM-5 was the most effective catalyst that can be used in the production of aromatic hydrocarbons.
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ADVANCED SYNTHESIS & CATALYSIS
·
2017
·Vol. 359
·期 13
·2215-2221
·
IF 5.646
Wenhui Zhu,Yingcai Ding,Zhaogang Bian,Ping Xie,Baojun Xu,Qiujie Tang,Wei Wu,Aihua Zhou
Sulfenylation is an important transformation to generate C−S bonds in organic synthesis. Here, two three-component synthetic protocols have been developed by using imidazo[1,2- a ]pyridine, inorganic, odorless S 8 and alcohols or arylboronic acids as reactants to make alkylthio-/arylthio-substituted imidazo[1,2- a ]pyridine derivatives via C( sp 2 )–H functionalization. The reactions proceeded with high efficiency and broad functional group tolerance, affording the products regioselectively and in good yields.
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BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-15
·
IF 0
Guo J.,Ma Yu L.,Yu Jia Y.,Gao Yu J.,Ma Ning X.,Wu Xiao Y.
Herein, 2-(2-methoxyphenoxy)-1-phenylethanol (β- O -4), 2-methoxyphenyl anisole (α- O -4) and 4-phenoxyphenol (4- O -5) were selected as typical lignin model compounds. Given the effectiveness of traditional acid–base catalysts for lignin depolymerisation, a novel Ni/CaO–H-ZSM-5(60) catalyst was prepared to investigate the difficulty level of C–O bond of three model compounds cleavage in ethanol. It was observed that Ni/CaO–H-ZSM-5(60) had prominent performance on the C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ). Among them, the C–O bond of α- O -4 and β- O -4 could be completely cleaved within 60 min. Although the C–O bond of 4- O -5 had high bond energy, 41.2% of conversion was occurred in 60 min. The introduction of CaO could regulate the acidity of H-ZSM-5 to enhance the ability to break C–O bonds. Moreover, the possible pathways of C–O ether bonds in three lignin model compounds cleavage were proposed in order to selectively obtain target products from the raw lignin degradation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Shanshan Ding,Danjun Mao,Shaogui Yang,Fei Wang,Lingjun Meng,Mengshu Han,Huan He,Cheng Sun,Bin Xu
The novel boron nitride coupled Bi-rich Bi 4 O 5 Br 2 layered microspheres (h-BN/Bi 4 O 5 Br 2 -LMs) were successfully synthesized via a facile ionic liquid-in-water (IL/W) microemulsion-mediated route. The physical, chemical and optical properties of these heterojunction photocatalysts were thoroughly characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometry (EDS), transmission electron microscopy (TEM) and UV–vis diffuse reflection spectroscopy (DRS). Their photocatalytic activities were primarily evaluated by degradation of 4- tert -butylphenol (PTBP), which found 1.0 wt% h-BN/Bi 4 O 5 Br 2 -LMs to be the best one. The photocurrent experiments showed that the photocurrent density of 1.0 wt% h-BN/Bi 4 O 5 Br 2 -LMs was four times higher than that of pure Bi 4 O 5 Br 2 -LMs due to enhanced charge transfer ability of the former. It revealed that the addition of h-BN was in favor of suppressing the photoinduced electron-hole pair recombination of Bi 4 O 5 Br 2 -LMs, so as to improve the photocatalytic activity of the composite. O 2 − and h + were proved to be the main reactive species in the photocatalytic process by scavenger experiments and electron paramagnetic resonance (EPR) spectra. In addition, the photocatalytic mechanism of h-BN/Bi 4 O 5 Br 2 -LMs was further elaborated in this work. The probable degradation products were identified by GC–MS. The proposed conjugated addition and oxidation reactions were described to be the main pathways by combining the frontier electron density calculation and GC–MS results.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 2
·1225-1238
·
IF 1.7
Wang Wanchun,Chi Yangxu,Sun Jiahong,Zhou Feng,Zhan Su
In this work, Ag/CuBi 2 O 4 composite photocatalyst films with excellent photocatalytic sterilization properties were prepared by photodeposition. The photocatalytic activity of silver-modified CuBi 2 O 4 (Ag/CuBi 2 O 4 ) under the photocatalytic-Fenton coupling system was verified by its inactivation rate of Escherichia coli in seawater. The results showed that the photocatalytic sterilizing performance of CuBi 2 O 4 loaded with Ag in the presence of trace amounts of H 2 O 2 was significantly improved. 15Ag/CuBi 2 O 4 possessed the optimal photocatalytic activity, and its sterilizing rate in 30 min could reach 96.6%. Its sterilization rate in 30 min could reach 96.6%, which is about 70% higher than that of pure CuBi 2 O 4 . Meanwhile, the mechanism of the enhanced sterilization performance of Ag/CuBi 2 O 4 in the photocatalytic-Fenton coupled system was investigated. Firstly, according to the electrochemical results, the loading of Ag can significantly improve the charge separation efficiency of CuBi 2 O 4 . And promotes the conversion of H 2 O 2 to hydroxyl radicals(·OH); Secondly, the valence band potential of 15Ag/CuBi 2 O 4 is more positive than that of CuBi 2 O 4 , which suggests that Ag loading can enhance the oxidation of CuBi 2 O 4 cavities. Comprehensive radical trapping experiments demonstrate that ·OH and holes (h + ) are the main active species for inactivating Escherichia coli (E. coli). In this work, effective conversion of H 2 O 2 to ·OH in a wide spectral range was achieved by loading Ag nanoparticles on the surface of CuBi 2 O 4 , which provides a new idea for the development of photocatalytic-Fenton coupling technology and ballast water treatment. Graphical abstract
研究领域:
环境科学
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材料科学
·
光催化
·
微生物学
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ASTROPHYSICAL JOURNAL
·
2007
·Vol. 662
·期 2
·1059
·
IF 6.119
Bruce J. Hrivnak,T. R. Geballe,Sun Kwok
Medium-resolution spectra have been obtained of seven carbon-rich proto-planetary nebulae (PPNs) and one young planetary nebula from 3.2 to 3.8 μm, an interval containing the prominent hydrocarbon C–H stretches at 3.3 and 3.4 μm due to aromatic and aliphatic structures, respectively. The 3.3 μm feature is newly identified in IRAS 23304+6147, 22223+4327, and 06530-0213 and is confirmed in Z02229+6208. Three of the PPNs emit in the 3.4 μm feature, two of these being new identifications, IRAS 20000+3239 and 01005+7910, with two others showing possible detections. The 3.3 and 3.4 μm emission features in IRAS 22272+5435 are seen in the nebula offset from the star but not at the position of the central star, consistent with the 2003 results of Goto et al. A similar distribution is seen for the 3.3 μm feature in IRAS 22223+4327. All of the PPNs except IRAS 22272+5435 show Class A 3 μm emission features. These observations, when combined with those of the approximately equal number of other carbon-rich PPNs previously observed, demonstrate that there are large differences in the 3 μm emission bands, even for PPNs with central stars of similar spectral type, and thus that the behavior of the bands does not depend solely on spectral type. We also investigated other possible correlations to help explain these differences. These differences do not depend on the C/O value, since the Class B sources fall within the C/O range found for Class A. All of these 3.3 μm sources also show C2 absorption and 21 μm emission features, except IRAS 01005+7910, which is the hottest source at B0.
研究领域:
天文学
·
星云研究
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高影响因子
Alexandria Engineering Journal
·
2024
·
IF 6.2
Hong Zhang,Ming Chen,Tiantian Liang,Zanpeng Zhang,Changhui Yang
The use of nanocarbon materials to enhance the toughness of fragile cementitious materials has attracted increasing attention for investigation. This study examines the effects of incorporating graphene oxide (GO) into NaOH-activated slag (AAS) pastes and mortars, focusing on workability, phase composition, mechanical properties, and the local mechanical properties of the interfacial transition zone (ITZ) between sand and paste. The experimental results indicate that the addition of GO decreases the flowability of NaOH-AAS pastes, with noticeable aggregation at concentrations above 0.03 wt%. Furthermore, GO enhances the hydration degree of ground granulated blast furnace slag (GGBS), leading to an increased amount of C-A-S-H gel without introducing new phases. In terms of macro performance, incorporating 0.03 wt% GO significantly improves the compressive and flexural strengths of NaOH-AAS mortars by 10.6 % and 17.9 %, respectively. Additionally, the presence of GO reduces the ITZ thickness from 30 to 15 micrometres in NaOH-AAS mortars, which likely contributes to the enhanced mechanical performance.
研究领域:
材料科学
·
水泥基材料
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纳米复合材料
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建筑材料化学
·
界面工程
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2013
·Vol. 31
·期 3
·371-376
·
IF 0.917
Wei Zhu,Haoyang Wang,Haihui Peng,Guosheng Liu,Yinlong Guo
Pd-catalyzed oxidative coupling reaction was of great importance in the aromatic C H activation and the formation of new C O and C C bonds. Sanford has pioneered practical, directed C H activation reactions employing Pd(OAc) 2 as catalyst since 2004. However, until now, the speculated reactive Pd(IV) transient intermediates in these reactions have not been isolated or directly detected from reaction solution. Electrospray ionization tandem mass spectrometry (ESI-MS/MS) was used to intercept and characterize the reactive Pd(IV) transient intermediates in the solutions of Pd(OAc) 2 -catalyzed oxidative coupling reactions. In this study, the Pd(IV) transient intermediates were detected from the solution of Pd(OAc) 2 -catalyzed oxidative coupling reactions by ESI-MS and the MS/MS of the intercepted Pd(IV) transient intermediate in reaction system was the same with the synthesized authentic Pd(IV) complex. Our ESI-MS(/MS) studies confirmed the presence of Pd(IV) reaction transient intermediates. Most interestingly, the MS/MS of Pd(IV) transient intermediates showed the reductive elimination reactivity to Pd(II) complexes with new C O bond formation into product in gas phase, which was consistent with the proposed reactivity of the Pd(IV) transient intermediates in solution.
研究领域:
有机化学
·
金属有机化学
·
分析化学
·
催化化学
·
质谱学
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Ping Xin,Hongjiang Li,Ziwei Huang,Kexin Su,Ying-Ying Gu
To address the challenges of low selectivity and poor stability in hydrogen peroxide (H 2 O 2 ) electrosynthesis within neutral media, this study developed an O/N co -doped carbon nanotube-polytetrafluoroethylene composite cathode (designated as GF/ONCNTs-6/PTFE). Through precise control of the synergistic effects between pyrrolic-N doping (40.7 %) and carboxyl/ether functional groups, the adsorption of *OOH intermediates was significantly enhanced; simultaneously, PTFE micro-cracks were employed to establish triple-phase interfaces for facilitated oxygen diffusion. The cathode achieved a high H₂O₂ yield of 139.45 mg/L under neutral conditions (pH 7), with a current efficiency of 67.06 %, and exhibited only 8.2 % activity loss after 10 cycles. In an integrated electro-Fenton system, it accomplished 98.8 % degradation of methyl orange within 2 h under optimal conditions. This work demonstrates that defect engineering and O/N functionalization in composite cathodes significantly boost 2e − ORR efficiency, offering a promising laboratory-scale platform for electrochemical wastewater purification
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高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Kudakwashe Meki,Shiyu Meng,Zihao Liu,Zhuowen Wang,Baojian Jing,Huiqun Zhang,Peng Liu,Shan Qiu
DMS gradient improves micropore access and O₂ transport, reducing flooding. • CB-DV06 yields 750 mg L −1 H₂O₂ at >60% Electro-Fenton efficiency. • DMS-modified GDEs remove 85% RBB and reduce TOC 60% in 120 min. • Surface area reaches 222.9 m 2 /g; electroactive sites increase sixfold. • Dual-phase oxygen diffusion boosts ORR kinetics and degradation rate. Hydrogen peroxide (H₂O₂) electrosynthesis via the two-electron oxygen reduction reaction (2e − ORR) is critically dependent on the formation of stable and well-regulated triple-phase interfaces (TPIs), where gas, liquid, and catalyst converge. However, micropore flooding and uneven wettability in carbon-black gas diffusion electrodes (GDEs) often hinder oxygen transport and deactivate active sites. In this work, we address these challenges by introducing a dimethyl silicone oil (DMS) volume-gradient strategy to engineer confined TPIs within the carbon catalyst layer. Carbon-black GDEs were prepared using DMS volume-controlled of 0.4, 0.6, and 1.2 mL, with CB-DV06 identified as the optimum configuration. This design balances hydrophobicity and pore accessibility, promoting sustained oxygen diffusion and suppressing water blockage without impeding electron or ion transport. The optimized GDE (CB-DV06) achieved ~750 mg L −1 H₂O₂ after 180 min with current efficiencies exceeding 60% and enhanced electrochemically active surface area. To demonstrate the practical applicability of the in situ generated H₂O₂, Reactive Black B (RBB) degradation was employed as a model pollutant-removal reaction. The integrated system achieved approximately 85% RBB decolourisation, demonstrating the applicability of this interface-engineering strategy for pollutant-removal applications. Overall, this study highlights a low-impact approach for optimizing oxygen reduction environments in porous electrodes, advancing sustainable oxidant generation and environmental remediation. Download: Download high-res image (127KB) Download: Download full-size image
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