INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Hongyu Niu,Yuan Cheng,Chuang Li,Shaojie Li,Jingjie Luo,Changhai Liang
Rational design of promising Cu catalyst requires better understanding of the Cu–support perimeter for reactions such as hydrogenation rearrangement of furfural─a pivotal and alternative transformation to produce cyclopentanol. Herein, a series of Cu catalysts with constructed Cu-M-Ox interfaces (M = Zn or Al) have been synthesized. In freshly reduced Cu/ZnO-Alx samples, aluminum species was enriched surrounding Cu. The Cu-Al-Ox contacting interface was formed, and the CuAl2O4 spinal structure was detected as a combining consequence only if Zn and Al species coexisted. The specific metal–support synergistic interaction and Cu-Al-Ox contacting interface simultaneously aroused the enhanced redox property and large number of surface acid sites, facilitating the adsorption/activation of hydrogen and reactants. During the reaction, Al2O3 retreating from the Cu-Al-Ox interface caused the replacement of Cu-Al-Ox by new Cu-Zn-Ox interface, which was directly correlated with the irreversibly changed chemical structure and decreased cyclopentanol yield, although the furfural conversion was well sustained. In this work, we confirmed that supported copper catalysts were competent for the activation and conversion of furfural, with the turnover frequency reaching 28.1 h–1 by the Cu/ZnO-Al3 sample at temperatures as low as 90 °C. The further transformation of cyclopentanone to cyclopentanol was largely depending on the maintenance of a steady Cu-Al-Ox contacting interface.
研究领域:
催化
·
化学工程
·
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xinyue Wang,Huan Cheng,Yuanzhi Min,Xian Li,Lijun You,Jumei Li
In this study, a crystalline mesoporous ZrO 2 interlayer allowing for enrichment capability and photocatalytic activity was introduced to develop a novel magnetic Fe 3 O 4 /m-ZrO 2 /Ag nanocomposite combined with excellent SERS activity and photocatalytic property. The coverage of Ag nanoparticles on Fe 3 O 4 /m-ZrO 2 /Ag was well controlled to tune their SERS sensitivity by varying the feed amount of AgNO 3 . Several characterization methods were utilized to investigate their composition, morphology and crystal structure. The SERS experiments demonstrated Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites possessed markedly SERS sensitivity, exceptional signal reproducibility and excellent storing stability. They could sense R6G and Cr (VI) at the concentrations of 10 −9 and 5 × 10 −8 M, respectively. Beyond that, the Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites effectively accomplished recyclable detecting R6G and Cr (VI) in 5 cycles through facile photocatalytic removal of pollutants under UV irradiation. Altogether, the novel Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites prepared in this study have high SERS sensitivity and good photocatalytic performance, which is of great significance for environmental detection and ecological restoration.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 38
·期 2
·777-783
·
IF 2.966
Aijuan Xie,Liang Ji,Shiping Luo,Zhiliang Wang,Yiyang Xu,Yong Kong
A nanocomposite of poly(m-phenylenediamine)/palygorskite (PmPD–PG) is facilely synthesized via in situ oxidative polymerization of m-phenylenediamine (mPD) on palygorskite (PG) and its reactive adsorbability to Cr(VI) is examined. PG in the nanocomposite plays important roles in the improvement of adsorptivity of Cr(VI). The pH value of the solution is increased after adsorption, which is quite different from Pb(II) adsorption with aromatic diamine polymers. This unusual removal behavior of Cr(VI) with PmPD–PG is due to the redox reaction between Cr(VI) and amino/imino groups on the PmPD chains.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Yining Ma,Huaijuan Zhou,Jingting Zhu,Shidong Ji,Shanhu Bao,Rong Li,Ping Jin
Flake-like VO 2 (M) has been successfully synthesized by annealing plate-like (NH 4 ) 0.6 V 2 O 5 in vacuum and its thermochromicity was investigated. Preparation conditions such as temperature and vacuum degree have been varied to obtain the pure phase. The formation mechanism from ammonium vanadium bronze to VO 2 (M) has been explored. The flake-like VO 2 (M) shows an excellent thermochromicity; the infrared modulation at 2500 nm was up to 56.6% with a 30% visible transmittance which will be beneficial for smart windows, smart curtains or other applications.
研究领域:
材料科学
·
热致变色材料
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纳米材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Peng Zhang,Fangfang Li,Xuefang Yao,Pengze Zhang,Yukai Wu,Mengmeng Xi,Fanhui Meng,Lihua Kang,Mingyuan Zhu
The GaZrO x solid solution has been recently employed in OX-ZEO bifunctional catalysts for efficient conversion of syngas to light olefins, but it remains challenging to identify the specific contributions of Zr and Ga and to understand the detailed reaction mechanisms due to the structural complexity. To address this complexity and elucidate the active sites over the Zr-Ga oxide system, this study presents a catalyst designed by physical mixing ZrO 2 with different crystalline phases ( m -ZrO 2 & t -ZrO 2 ) and α -Ga 2 O 3 . The physical mixture of m -ZrO 2 and α -Ga 2 O 3 achieves a high CO conversion of 39.1 %, with light olefins selectivity of 87.3% among hydrocarbons after combined with SAPO-34, surpassing the performance of physical mixture of t -ZrO 2 and/or α -Ga 2 O 3 with SAPO-34. Combining the various characterizations and DFT calculations, we have confirmed that m -ZrO 2 site, enriched with oxygen vacancies and surface hydroxyl groups, is essential for CO adsorption and HCOO* intermediate formation, while the α -Ga 2 O 3 site plays a key role in the dissociation of H 2 . Furthermore, the electron transfer from m -ZrO 2 to α -Ga 2 O 3 in their mixture is more efficient than in a physically mixed t -ZrO 2 and α -Ga 2 O 3 . This accelerates the H 2 dissociation and boosts the spillover of hydrogen from α -Ga 2 O 3 to m -ZrO 2 , leading to the formation of more CH 3 O* intermediates and higher light olefins yield when combined with SAPO-34.
研究领域:
催化化学
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材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
Transactions of the Indian Ceramic Society
·
2020
·
IF 0.952
Shifa Wang,Huajing Gao,Hong Yu,Peiying Li,Yanwu Li,Chaoli Chen,Yong Wang,Liang Yang,Zijuan Yin
MgAl2O4:M (M = Ti, Mn, Co, Ni) phosphors were successfully prepared by a modified polyacrylamide gel method. Calcination temperature and metal particle has significant effects on the phase transition, optical and color properties of Mg Al2O4: M phosphors. Ti, M n, Co and Ni metal particles introduced into the MgAl2O4 system can produce a variety of colours from white, grayish black, blue to turquoise blue. Mn, Co and Ni metal particles added into MgAl2O4 system can extend their light absorption to visible light range, while the Ti metal particles clad into the system did not improve significantly. Co metal particles appended into the MgAl2O4 system can cause fluorescence quenching of emission peak at 395 nm and enhancement of emission peak at 405 nm, while the Ti and Mn metal particles infused into the system can bring the enhancement of visible emission peak at 425 nm. The fluorescence quenching of the peak at 395 nm can be ascribed to the wavelength of Co metal particles matching the surface plasmon absorbance band of MgAl2O4:M phosphor. A reduction in emission intensity at 425 nm can be assigned to electron transfer from the conduction band (CB) of MgAl2O4 to the CB of metal particles causing non-radiative decay.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Ying-Di Luo,Qi-Lei Zhang,Shan-Jing Yao,Dong-Qiang Lin
This study investigated adsorption selectivity of immunoglobulin M (IgM), immunoglobulin A (IgA) and immunoglobulin (IgG) on four mixed-mode resins with the functional ligands of 4-mercatoethyl-pyridine (MEP), 2-mercapto-1-methylimidazole (MMI), 5-aminobenzimidazole (ABI) and tryptophan-5-aminobenzimidazole (W-ABI), respectively. IgM purification processes with mixed-mode resins were also proposed. All resins showed typical pH-dependent adsorption, and high adsorption capacity was found at pH 5.0–8.0 with low adsorption capacity under acidic conditions. Meanwhile, high selectivity of IgM/IgA and IgM/IgG was obtained with ABI-4FF and MMI-4FF resins at pH 4.0–5.0, which was used to develop a method for IgM, IgA and IgG separation by controlling loading and elution pH. Capture of monoclonal IgM from cell culture supernatant with ABI-4FF resins was studied and high purity (∼99%) and good recovery (80.8%) were obtained. Moreover, IgM direct separation from human serum with combined two-step chromatography (ABI-4FF and MMI-4FF) was investigated, and IgM purity of 65.2% and a purification factor of 28.3 were obtained after optimization. The antibody activity of IgM was maintained after purification. The results demonstrated that mixed-mode chromatography with specially-designed ligands is a promising way to improve adsorption selectivity and process efficiency of IgM purification from complex feedstock.
研究领域:
生物化学
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生物技术
·
蛋白质纯化
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenbin Li,Jianfeng Huang,Liyun Cao,Xifei Li,Shaoyi Chen,Liangliang Feng
Constructing polycrystalline structure is an effective strategy to improve the electrochemical performance of electrode materials. To enhance the electroactivity of anisotropic VO 2 (M), polycrystalline VO 2 (M) with well-dispersed crystalline zones is successfully synthesized by a facile one-step hydrothermal method , and then their electrochemical performances as an anode of lithium-ion batteries are systematically explored. Results show that the synergistic effect of crystalline zones and amorphous matrices in polycrystalline structure can dramatically activate the anisotropic VO 2 (M) electrode, which contributes to increasing the electroactive zones and facilitating the charge transfer kinetics. Compared with single-crystal VO 2 (M), polycrystalline VO 2 (M) shows the significantly enhanced electrochemical performance, delivering a high reversible capacity of 476 mAhg −1 at 100 mAg −1 after 150 cycles, which is far superior to the theoretical capacity and the reported mixture of VO 2 (M) and VO 2 (B). This work opens up new insights for the activation of anisotropic electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHROMATOGRAPHIA
·
2017
·Vol. 80
·期 3
·463-471
·
IF 1.402
Xu Mei,Chen Kun,Luo Chen,Song Guoxin,Hu Yaoming,Cheng Hefa
Abstract In this paper, a simple but efficient method for the extraction and analysis of bifenthrin in water samples was proposed. The Fe 3 O 4 -based nanocomposites (Fe 3 O 4 @m-SiO 2 /PSA@Zr-MOF) were successfully synthesized and developed as adsorbents for magnetic solid-phase extraction. With the solvothermal reaction and sol–gel method, the resultant adsorbents exhibited excellent characteristics of large surface areas, homogeneous pore size, strong magnetic responsivity and high hydrophilicity. The parameters affecting the extraction performance including adsorbent amounts, adsorption time, species of eluents and desorption time were investigated. Under the optimal conditions, validation experiments such as recovery, reproducibility and limits of detection (LOD) were carried out and showed satisfactory results. The LOD of the targeted analytes was found to be 0.5 μg L −1 . The average recovery was 103.2% with the intra-day and inter-day relative standard deviations of 2.0 and 3.5%, respectively. Ultimately, the novel magnetic adsorbents were successfully applied to detect the bifenthrin compound in real water samples. Graphical Abstract
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2017
·Vol. 90
·期 1
·149-155
·
IF 1.095
Dong Peng,Li Zeyu,Ji Dong,Wang Xiaorui,Yun Hongfei,Du Zhisong,Bian Jie,Li Guixian
Modified Y type catalyst (M-Y) shows great potential for the preparation of toluene attribute to catalyst topology and synergistic effect of Lewis acid and Brönsted acid in the alkylation reaction. However, it still remains a big challenge to build a reaction mechanism. Thereby, based on the study of HZSM-5, H-beta and M-Y catalysts structure and physical properties, a plausible reaction mechanism was proposed. The samples were characterized by X-ray diffraction, N 2 adsorption/desorption, Fourier transform infrared absorption spectra and Pyridine adsorption infrared. The activity of catalysts was tested in benzene alkylation with methanol and was found to be in the following increasing order: Na-Y (no effect) < H-Y << HZSM-5 < H-beta < M-Y.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Junqian Wang,Yi Wang,Yuqi Wang,Xinyi Li,Caichao Wu,Tianyu Zhang,Bin Tian,Lili Qian,Yang Guo,Le Wu,Lan Zheng,Yanan Li,Xin Ding
Currently, traditional hydrodeoxygenation (HDO) catalysts have various shortcomings such as low activity levels and vulnerability to deactivation. Therefore, a series of MXene-supported Ni-M (M = Pd, Pt, Ru) bimetallic catalysts were designed and prepared. The above catalysts were also comprehensively characterized using XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, SEM and TEM methods. Moreover, due to the largest particular specific surface area, moderate amount of acid sites and the strongest three-electron transfer channels between support and active metals of Ni-Pd/MXene catalyst, it exhibited the superior catalytic performance to achieve 100 % guaiacol conversion and 35.15 % highest overall yields of HDO products (Y HDO ) under the optimal reaction conditions (at 340 °C for 8 h, utilizing in-situ hydrogen source: formic acid). Furthermore, a detailed discussion on the main reaction pathways and mechanism of guaiacol HDO catalyzed by Ni-Pd/MXene was provided, an unique bimetallic synergistic “relay catalytic” theory has been proposed. Kinetic studies revealed that phenol, one of the main HDO products, is primarily generated via guaiacol demethoxylation, while catechol dehydroxylation to phenol acts as the rate-determining step. This work introduces a new strategy for the development of HDO catalysts.
研究领域:
化学工程
·
催化科学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2024
·
IF 3.4
Zhiwei Huang,Yaxin Yuan,Xinyi Li,Yiyang Li,Min Wang,Zhuqing Wang
E-waste contains a variety of non-renewable precious metal resources, and the amount is significantly higher than the abundance of precious metals in the corresponding ores. Therefore, it is of great significance to recover and reuse precious metals in e-waste. In this study, we successively used a simple one-step oxidation method and physical cross-linking to prepare a poly-m-phenylenediamine composite membrane material (CMC–PmPD composite membrane) containing a large number of recycling groups. The prepared CMC–PmPD composite membrane has high adsorption capacity and adsorption efficiency for Au(III), and the maximum adsorption capacity for Au(III) reaches 421.1 mg g−1. The adsorption follows a second-order kinetic process and a Langmuir isotherm model, indicating that the adsorption mechanism is a monolayer chemisorption. The regeneration of the composite membrane material can be realized after a simple thiourea solution immersion, and 89.5% adsorption efficiency is maintained after five regeneration cycles. In addition, when the CMC–PmPD composite membrane was applied to the treatment of mixed heavy metal ion solutions with different concentrations and compositions, the CMC–PmPD composite membrane was always able to selectively adsorb more than 95% of Au(III) from the simulated solution or e-waste leachate, which was highly selective and applicable. The CMC–PmPD composite membrane has a broad application prospect in metallurgy and fine chemical industry.
研究领域:
材料科学
·
环境科学
·
冶金工程
✓ 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）