CATALYSIS LETTERS
·
2024
·Vol. 155
·期 1
·1-17
·
IF 2.3
Wei Ruiping,Wang Ziqi,Yao Mingzhu,Xia Rongying,Liu Huijun,Yang Lei,Ma Guanghui,Gao Lijing,Xiao Guomin
The metal-organic frameworks (MOFs) with oxidative and acidic active sites demonstrate promising potential for tandem reactions involving olefin oxidation carboxylation. In this study, M-BTCs were synthesized via a solvothermal method, employing 1,3,5-benzenetricarboxylic acid (H 3 BTC) as a ligand in combination with various metals (Mn, Co, Cu, Ni). The good thermal stability and morphology of M-BTC was verified by various characterization techniques, and its catalytic performance was evaluated for oxidative carboxylation. The catalytic activity of Mn-BTC, with Mn 3+ / Mn 2+ as the primary oxidation site, was found to be superior in both olefin epoxidation and CO 2 cycloaddition. The effects of reaction conditions on both epoxidation of styrene and the cycloaddition reaction were investigated, respectively. Under optimal reaction conditions (epoxidation: 10 wt% Mn-BTC of styrene, 80 ℃ for 12 h; cycloaddition: 100 ℃ for 12 h with a CO 2 flow rate of 15 ml/min and tetrabutylammonium bromide (TBAB) amount of 15 mol%), a 53% yield of styrene carbonate (SC) was obtained in the assisted tandem reactions. Furthermore, cycling experiments as well as XRD and FT-IR spectra of the catalysts after use demonstrated that Mn-BTC maintained its crystal structure and retained a yield of 49% SC after three cycles. Finally, a possible mechanism for assisted tandem catalytic reaction over Mn-BTC was proposed. Graphic
研究领域:
化学
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材料科学
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 52
·30249-30258
·
IF 3.049
Feng Yang,Yu Liu,Tong Liu,Shuan Liu,Haichao Zhao
In this work, a water-soluble host–guest complex containing carboxymethylated beta-cyclodextrin (CM-β-CD) and an aniline trimer (AT) was synthesized. The application of AT–CM-β-CD as an inhibitor for alleviating the corrosion of Q235 carbon steel in 1 M HCl solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that the inhibition efficiency was significantly increased in the presence of AT–CM-β-CD, and the inhibition efficiency was up to 99.2% when the concentration of AT–CM-β-CD was 250 mg L−1. Field emission scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM) confirmed that the corrosion inhibitor had excellent corrosion inhibition effects due to the formation of an adsorption film on the surface of Q235 carbon steel. According to the data extracted from the Langmuir adsorption model, AT–CM-β-CD absorption involves both physisorption and chemisorption.
研究领域:
材料科学
·
电化学
·
腐蚀与防护
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Zhengang Bu,Jianhua Li,Siqi Fang,Yuanlin Zhan,Wenzhuo He,Yibin Huang
The uniform and stable deposition of metal-organic frameworks (MOFs) onto membranes without compromising their performance presents a significant challenge. This study reports the fabrication of a photocatalytic self-cleaning membrane using hydrothermal and photochemical substitution methods. These methods enabled the uniform and stable deposition of β-FeOOH nanorods, m-MIL-100(Fe), and Ag nanoparticles (NPs) not only on the members surface but also throughout the interior of polyvinylidene fluoride (PVDF) membrane pores. The synergistic effect of these materials and their uniform and stable distribution within the PVDF membrane resulted in superior photocatalytic efficacy. The membrane's excellent photocatalytic performance facilitated the degradation of most pollutants, ensuring prolonged usage. Unlike other photocatalytic membranes requiring additional cocatalysts, our membrane degraded over 90% of various dyes without H 2 O 2 , demonstrating a greener usage mode and higher photocatalytic efficiency. The valence band (VB) and conduction band (CB) of β-FeOOH nanorods and m-MIL-100(Fe) were calculated, confirming the existence of a type-II heterojunction for the first time. Free radical trapping experiments identified hydroxyl radicals (·OH) as the primary reactive species in the degradation process. This research provides a novel approach to uniformly and stably load MOFs on membranes, enhancing their properties and offering insights into fabricating multifunctional photocatalytic membranes.
研究领域:
材料科学
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环境工程
·
化学工程
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Mingjun Xu,Zhao Jin,Meiling Xiao,Changpeng Liu,Wei Xing
The single-atom dispersed active sites and the thicker catalytic layer of metal-nitrogen-carbon (M-N-C) electrocatalysts based membrane electrode assembly (MEA) exhibit notable distinctions from Pt-based MEA, necessitating targeted optimization. This study systematically investigates the influence of compression on both structure and performance of the M-N-C electrocatalysts based MEA. Four compression ratios, ranging from 11.5% to 39.3%, were examined across diverse operational conditions. The variations in impedance across different electrochemical regions are observed, resulting from the superposition of distinct impedance components. It is found that the insufficient compression leads to higher porosity and the formation of cracks between catalytic layer and membrane, adversely impacting internal resistance and proton transport. Increasing compression first acts the catalytic layer, and then gradually acts on the interface, membrane and gas diffusion layer, thereby reducing internal resistance, charge transfer resistances, albeit at the expense of heightened mass transfer resistance. Among these factors, the influence of internal resistance affects significance to total performance. Furthermore, compression influenced mass transfer differently in various layers. For the catalyst layer, the effect was uniform and sustained, while for the gas diffusion layer, it initially remained constant and then experienced a sudden deterioration over a certain extent. Optimal MEA performance is achieved when the compression ratio attains 40 %, which 2.1 times higher than the low compression MEA. This finding emphasizes the necessity for higher compression on M-N-C electrocatalysts based MEA compared to Pt-based MEA.
研究领域:
能源科学
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材料科学
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Junxiu Wang,Zhenzong Zhang,Xi Wang,Yi Shen,Yongfu Guo,Po Keung Wong,Renbi Bai
A novel p-n heterostructure photocatalyst m-Bi 2 O 4 /BiOCl was successfully synthetized through a facile ion-etching method. Via adjusting the added volume of HCl solution, a series of different ratios of composite photocatalysts were obtained. The as-prepared samples of physical, chemical and optical characteristics were examined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, selected-area electron diffraction, Fourier transform infrared absorption, Raman microscope, N 2 adsorption-desorption, X-ray photoelectron spectroscopy and UV-vis spectrum technologies. The photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible light. The reaction rate constant of m-Bi 2 O 4 /BiOCl for methyl orange was 52.28 times higher than that of BiOCl. The characterization presented a good stability of materials. Furthermore, the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo-generated carries. The scavenger experiments evidenced that hole (h + ) and superoxide radical (•O 2 — ) were the primary active radicals. A possible photocatalytic mechanism was proposed. This work provided an alternative photocatalyst applied to water environmental remediation.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 7
·1-27
·
IF 2.8
Jing Xiaodong,Zhao Qianqian,Wang Qun,Xiong Xiaoqiang,Yang Xi,Huang Hai,Yuan Chenglong,Yan Junjie,Tan Guoguo,Zhao Tongyun,Gong Huayang
How do rare earth (RE) ions affect the microwave absorption performance of M-type hexagonal ferrites? We synthesized Sr 0.9 RE 0.1 Fe 12 O 19 and SrFe 12− x RE x O 19 ( x = 0.05, 0.1, 0.4, 0.8, 1.6, RE = La ~ Gd) series to investigate the similarities and differences in the mechanism of RE ion substitution on the absorption properties of materials. The occupancy tendency and substitution limit of RE ions in the M phase lattice, as well as the formation of impurity phases at grain boundaries, are key factors affecting the microwave absorption performance of materials. The synthesized materials include both pure M phase and coexistence of M phase and heterophases, and the heterophases are mainly FeRE y Sr 1− y O 3− z , CeO 2 and RE 3 Fe 5 O 12 . The strontium ferrite substituted with La and Ce has better absorption effect in pure M phase. The RL min of SrFe 11.9 La 0.1 O 19 can reach − 60.61 dB and the EAB max is 6.24 GHz with a thickness of 1.96 mm. Strontium ferrite substituted with Pr and Nd can achieve good absorption effects over a large range of substitution amounts, which is not only related to their high substitution limit in the M phase, but also to the perovskite type impurities generated by excessive substitution. The RL min of the SrFe 10.4 Nd 1.6 O 19 can reach − 75.34 dB, and the EAB max is 5.16 GHz with a thickness of 1.9 mm. The distribution of strontium ions in the two phases also becomes a key factor affecting the absorption performance. The substitution limit of Eu and Gd in the M phase is small, and excessive addition can form high resistance impurities, resulting in poor absorption efficiency of the system.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 35
·21607-21621
·
IF 3.361
Mingjun Cui,Xia Li
Novel nitrogen and sulfur co-doped carbon dots (N,S-CDs) were synthesized via a hydrothermal procedure using citric acid (CA) and thiourea (TU) as precursors, and the corresponding corrosion protection performance was first investigated for Q235 carbon steel in 1 M HCl solution. Experimental results indicated that N,S-CDs as mixed-type corrosion inhibitors could effectively prevent Q235 carbon steel from corrosion in 1 M HCl solution, and the corrosion inhibition efficiency was improved with the increase in N,S-CD concentration. The maximum value was achieved at 400 ppm of N,S-CDs at 25 °C, which was approximately 96.6%, 94.6% and 90.55%, according to the potentiodynamic polarization curves, EIS results and weight loss measurement, respectively. Additionally, with the temperature ranging from 25 to 55 °C, the inhibition efficiency obtained from the weight loss measurement was enhanced from 90.55% to 94.04%. Such superior inhibition effect was assigned to the physisorption and chemisorption of N,S-CDs on the Q235 carbon steel surface, which was also be confirmed by XPS analysis. The adsorption of N,S-CDs onto a steel substrate conformed to the Langmuir adsorption isotherm.
研究领域:
材料科学
·
腐蚀与防护
·
表面化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lizhe Ma,Zhihong Zhang,Jieli Duan,Jin Li,Qingyuan Lin,Yinlong Jiang,Kefu Zhu,Zhiyong Fang,Bang Ji,Zhou Yang
Catalyst performance is traditionally evaluated under high light intensity, where variations in e - -h + pair recombination rates at different light intensities may limit the applicability of the selected catalyst to diverse light sources. Response surface methodology (RSM) was employed to compare catalyst performance under two optimization processes, using tetracycline degradation rate and photon flux as response variables. The m-TiO 2 @CdS catalyst was characterized by XRD, SEM, TEM, XPS, and UV-Vis-DRS, and its preparation process was optimized using RSM, with precursor ratio, hydrothermal time, and temperature as variables. The proposed optimization model for tetracycline degradation rate and photon flux exhibited a strong correlation between predicted and experimental results. The tetracycline degradation rates for the two optimized preparation processes were nearly identical, at 61.87 % and 61.18 %, respectively. A comparison of tetracycline degradation kinetics under different light conditions (light saturation and non-saturation) for the two optimized m-TiO 2 @CdS samples demonstrated that the photon flux-based optimization model offered greater adaptability across a wider range of light intensities. Additionally, the repeatability of m-TiO 2 @CdS prepared under the optimal conditions was assessed, and a plausible mechanism for its photocatalytic degradation of tetracycline was proposed.
研究领域:
环境科学
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材料科学
·
光催化技术
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Baogui Ye,Zhongwei Zhao,Hongmei Liu
Construction of multi-interface contact step-scheme photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation Estrone and Congo red (CR). In this work, g-C 3 N 4 was selected as the main component, CeO 2 nanosheets with unique Ce 4+ →Ce 3+ conversion property and M-rGO were loaded on the surface of g-C 3 N 4 to construct magnetic photocatalyst, whose structure imparted reusability by magnetic retrieval and at the same time M-rGO acted as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performances were investigated with Estrone and CR, and the results showed that the composite photocatalyst g-C 3 N 4 /CeO 2 /M-rGO could degrade 71% of Estrone and 92% of CR. Free radical scavenger test showed that superoxide and hydroxyl radical species played a major role in the degradation. Furthermore, it was demonstrated that the magnetic photocatalyst g-C 3 N 4 /CeO 2 /M-rGO possessed strong antibacterial properties against Proteus mirabilis. A three-factor-three-level Box-Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), the mass of photocatalyst (mg) and pollution concentration (ppm) by responding surface methodology. It was expected that the g-C 3 N 4 /CeO 2 /M-rGO can be used as a magnetic photocatalyst to achieve its valorization, which has very broad development prospects in the field of environmental remediation or catalysis.
研究领域:
环境科学
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材料科学
·
生物学
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高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 18
·2212079
·
IF 29.4
Yuanyuan Jin,Jian Sun,Ling Zhang,Junqiang Yang,Yangwu Wu,Bingying You,Xiao Liu,Kai Leng,Song Liu
High-κ materials that exhibit large permittivity and band gaps are needed as gate dielectrics to enhance capacitance and prevent leakage current in downsized technology nodes. Among these, monoclinic ZrO 2 (m-ZrO 2 ) shows good potential because of its inertness and high-κ with respect to SiO 2 , but a method to produce ultrathin single crystal is lacking. Here, the controllable preparation of ultrathin m-ZrO 2 single crystals via the in situ thermal oxidation of ZrS 2 is achieved. As-grown m-ZrO 2 presents an equivalent oxide thickness of ≈0.29 nm, a high dielectric constant of ≈19, and a breakdown voltage ( E BD ) of ≈7.22 MV cm −1 . MoS 2 field effect transistor (FET) by using m-ZrO 2 as a dielectric layer shows comparable mobility to that using SiO 2 dielectric. The ultraclean interface of m-ZrO 2 /MoS 2 and high crystalline quality of m-ZrO 2 lead to negligible hysteresis in transfer curves. Single crystal m-ZrO 2 dielectric shows potential application in digital complementary metal oxidesemiconductor (CMOS) logic FET.
研究领域:
材料科学
·
纳米电子学
·
二维材料
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半导体器件
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介质材料
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DOI
高影响因子
CATALYSIS LETTERS
·
2014
·Vol. 144
·期 6
·1001-1008
·
IF 2.291
Lin Chao,Tao Kai,Hua Dayin,Ma Zhen,Zhou Shenghu
Abstract Bimetallic Au 3 M (M = Ni, Co, Fe) nanoparticles (NPs) were synthesized by reducing a mixture of Au 3+ and metal cations (Ni 2+ , Co 2+ , Fe 3+ ) by butyllithium in the presence of oleylamine. Au 3 M NPs were then deposited onto a commercial SiO 2 support. The Au 3 M/SiO 2 samples were not particularly active in the catalytic reduction of p -nitrophenol unless they were converted into Au–MO
x
/SiO 2 after appropriate thermal treatment in air. The Au–MO
x
/SiO 2 catalysts showed good thermal stability and significantly higher p -nitrophenol conversions than Au/SiO 2 . Relevant characterization was conducted employing X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Graphical Abstract
研究领域:
催化化学
·
材料科学
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高影响因子
ENERGY
·
2022
·
IF 8.857
Wei Lu,Ao Gao,Weili Sun,Yuntao Liang,Zhenglong He,Jinliang Li,Yong Sun,Shuanglin Song,Shaocong Meng,Yingjiazi Cao
A kind of simple and efficient m-Cresol water-based inhibitor was proposed. The inhibitory effects of its solutions on the spontaneous combustion of different-rank coals were discussed. Furthermore, the micromorphology and wetting characteristics of different-rank coals were analyzed through a scanning electron microscope and a contact angle meter, respectively. Besides, the weight loss rates, oxidation characteristics, pore structure characteristics and free radical changes of different coal samples were investigated by a thermogravimetric analyzer, temperature-programmed experiments, a surface area analyzer and an electron spin resonance spectrometer, respectively. The results indicate that the prepared inhibitor solution at the 0.3 wt% sodium dodecyl sulfate (SDS) not only boasts good emulsification and wetting performance, but also plays a role in permeability enhancement. The m-Cresol/SDS solution can wet the coal surface and permeate the inner pore surface, forming a uniform inhibitor layer on both the coal surface and the inner pore surface to isolate oxygen, retain water and inhibit free radical generation. Moreover, it can not only effectively reduce the weight loss rate, CO production, specific surface areas and free radical concentration in the oxidation process of Coal XLH , Coal BLT and Coal YQ , but also improve the inhibition rate (to 79.1%, 67.4% and 54.3% at 170 °C respectively).
研究领域:
矿业工程
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）