JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 11
·10651-10659
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IF 2.195
Huang Xuechen,Liu Bang,Wang Shuanghu,Liu Yuxi,Wu Gang
Bi 2 O 3 - and MgO-doped BaTiO 3 –(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (BT–NBMT) ceramics were synthesized from a solid-state approach, and then the impacts of Bi 2 O 3 and MgO dosages on the structures and dielectric characteristics were studied. Obvious dual peaks were observed with Bi 2 O 3 dosage to 0.04 and MgO dosage to 0.02. The low-temperature dielectric stability and grain size of the Bi 2 O 3 dopant were improved, while those of the MgO dopant hardly changed with MgO dosage to 0.02, indicating the core/shell microstructure of BT–NBMT was formed following the dissolving-precipitating mechanism of BT systems doped with low-melting-point substances. The low-temperature dielectric stability of the Bi 2 O 3 - or MgO-doped BT–NBMT ceramics first improved and then deteriorated with the increase of doping concentrations. High-temperature stability and diffuse-state transition were found in the optimal ceramics. The second phases of Bi 2 O 3 and MgO, magnesium titanium compounds were observed in Bi 2 O 3 and MgO dopants, respectively. Bi 2 O 3 -doped and MgO-doped ceramics exhibited a fine-grained microstructure and significant grain growth, respectively, and the core/shell microstructure was responsible for the dielectric temperature stability for Bi 2 O 3 dopants and collapsed to a homogeneous one with remarkable grain growth and the second phases for MgO dopants.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yuanwu Hu,Hongjie Cui,Zhenmin Cheng,Zhiming Zhou
CO 2 capture and sequestration is one of the viable solutions to reduce the CO 2 emissions from fossil fuel combustion, and sorption-enhanced water gas shift (SEWGS) is a promising technology for pre-combustion CO 2 capture. In this study, a novel alkali metal salt (AMS)-promoted MgO-CaCO 3 sorbent was applied to the SEWGS process, and this sorbent exhibited fast sorption rate, high capacity and good stability in 30 CO 2 capture cycles. Catalyst and sorbent particles were arranged in a layer-by-layer alternating configuration in the reactor. The effects of operating conditions such as temperature, pressure and initial H 2 O/CO molar ratio were investigated, and the thermodynamic equilibrium analyses of the CO 2 sorption on AMS-promoted MgO-CaCO 3 and the SEWGS process in the layered configuration were carried out, based on which the optimization of the reactor configuration was performed. A high-purity H 2 (99.4% in dry basis) was experimentally achieved in the SEWGS process at 573 K, 12 atm and an initial H 2 O/CO molar ratio of 1.5 with a three catalyst/sorbent layered configuration, and the cyclic stability was demonstrated over 10 consecutive SEWGS cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Hao Zhu,Wencheng Ma,Hongjun Han,Yuxing Han,Weiwei Ma
Nano-MgO was prepared by homogeneous precipitation method and applied for the degradation of quinoline. The characterization of the catalyst was determined by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), Transmission Electron Microscope (TEM) and Energy Dispersive Spectrometer (EDS). The results showed that the presence of nano-MgO significantly improved the degradation and mineralization of quinoline. Nine intermediates were identified by liquid chromatograph–tandem mass spectrometer (LC–MS/MS), gas chromatograph and mass spectrometry (GC–MS) and ion chromatograph (IC) analysis. And a possible degradation pathway of quinoline in catalytic ozonation was proposed. The change of dissolved ozone concentration and the effect of tert butyl alcohol (TBA) and phosphate indicated that the prepared catalyst could enhance ozone decomposition into hydroxyl radicals, which was considered to be mainly responsible for the pollutants removal. In addition, catalytic ozonation pretreatment was applied for the treatment of biologically pretreated coal gasification wastewater. The results demonstrated that catalytic ozonation pre-treatment improved the biodegradability of wastewater containing quinoline in terms of BOD 5 /COD (B/C), toxicity and resazurin dehydrogenase activity (DHA), indicating the potential of catalytic ozonation integrated with biosystem for this type of wastewater. This study would assist in obtaining a better understanding of the application of catalytic ozonation pre-treatment in biologically pretreated coal gasification wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Huixia Li,Shaofan Fang,Junfang Ding,Shaoqing Chen,Liping Li,Guangshe Li
Active-sites play a pivotal role in catalyzing reactions at surfaces, yet engineering these active sites still remains a significant challenge. In this work, hydroxylated MgO nanosheets supported ultrasmall PtNi alloys approximately 2.6(1) nm ( x Pt- y Ni/MgO hydr ) has been investigated via active-site engineering. Experimental results and DFT calculations reveal that electron transfers from Ni to Pt and from hydroxyl groups to Pt 5d-orbitals generate active sites NiPt-(OH) x . In the preferential CO oxidation (CO-PROX) reaction, these active sites on x Pt- y Ni/MgO hydr switch the bicarbonates reaction pathway depending on temperature range. Consequently, the optimal catalyst, 5%Pt-0.5%Ni/MgO hydr , achieves 100% CO conversion at 100 °C, demonstrating a broad temperature operation window (100–200 °C) and excellent durability. The active site engineering approach presented in this study can promote the discovery of more excellent catalysts with the optimal reaction route for various applications.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 11
·14746-14754
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IF 5.6
Boyu Chen,Lijuan Niu,Jianlong Chai,Zhiyuan Bai,Jiayin Zhang,Di Liu,Xuefeng Lu,Yabin Zhu
β-SiC ceramics were prepared by spark plasma sintering at 2200 °C with Y 2 O 3 , MgO , and CeO 2 as sintering additives. Al 2 O 3 was doped based on the above oxides to form a two-component sintering additive to carry out a comparative analysis. The effects of these additives on the microstructure, bulk density, and Vickers hardness of β-SiC were systematically studied. The mechanical properties of the single-component samples were superior to those of the two-component samples. Notably, the single-component sample with Y 2 O 3 , addition exhibited the highest density (98.69 %) and hardness (27.1 GPa), which can be attributed to the appropriate growth of the grains in the single-component sample with Y 2 O 3 . Additionally, the principle of lattice reduction in SiC ceramics was explored using first-principle calculations, further highlighting the advantage of Y 2 O 3 as a single additive for the high-temperature sintering of SiC ceramics.
研究领域:
材料科学
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陶瓷学
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力学性能
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计算材料学
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Nature Catalysis
·
2021
·Vol. 4
·期 5
·418-424
·
IF 41.813
Wang Hai,Wang Liang,Lin Dong,Feng Xiang,Niu Yiming,Zhang Bingsen,Xiao Feng-Shou
Strong metal–support interactions (SMSIs) are crucial for the preparation of supported metal catalysts. A prevailing view is that the redox feature of the metal oxide support is the driving force behind SMSI construction. Herein we demonstrate CO 2 -induced SMSIs between irreducible oxide MgO and noble gold nanoparticles, presenting electronic and geometric features that are similar to those of classical SMSIs. The key to these interactions is activating the oxide surface by a reversible reaction, MgO + CO 2 ⇆ MgCO 3 , which leads to migration of the support onto the gold nanoparticles to form thin overlayers. The overlayer is permeable to the reactant molecules, stable under the oxidation conditions and even water tolerant, resulting in sinter-resistant gold nanoparticle catalysts. This investigation provides an approach for the rational design and optimization of supported metal catalysts based on irreducible oxides, and deepens our understanding of the mechanism of SMSI formation.
研究领域:
催化
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材料科学
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化学工程
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Materials Today Energy
·
2022
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IF 9.257
Feifei Li,Houru Zhen,Linfeng Li,Yuanyuan Li,Qingmeng Wang,Xiaomin Cheng
Relatively weak thermal conductivity and antileakage performance of phase change materials (PCMs) limit their applications. The present work focuses on the development of a novel composite PCM (MP-LA/MgO/EG) based on the dispersion of expanded graphite (EG) and magnesium oxide (MgO) nanoparticles in a binary mixture of methyl palmitate-lauric acid (MP-LA). MgO/EG, a new supporting material, is assembled using expanded graphite and specially shaped MgO prepared with the surfactant-assisted high-temperature thermal decomposition method. In addition to maintaining the porous structure of EG and preventing the leakage of MP-LA, MgO/EG reduces the interface thermal resistance between the matrix and the PCM molecules because MgO maximizes heat conduction . The thermal conductivity of the proposed material (4.568 W/m/K) is 8.16 times higher than that of MP-LA, and its faster heat transfer rate is reflected directly in the infrared images. The enthalpy of MP-LA/MgO/EG-9 floats in a narrow range with the value of 1.88% during the process of heating-cooling cycles 100 times. The results reported herein can serve as a reference for the functional design of PCM supporting carriers that form good thermal conducting networks and provide the form-stable effect.
研究领域:
材料科学
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能源工程
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Hailong Fang,Shangzhen Feng,Jie Yang,Huanjin Jiang,Wenhao Wang,Rijie Wang,Jixiang Chen
MgO–Al 2 O 3 supported Ni and Ni–Mo bimetallic catalysts (referred as Ni/MgAl and Ni x Mo/MgAl with the Ni/Mo atomic ratio of x, respectively) were prepared by the co-precipitation method and tested for the dry reforming of methane (DRM) on an atmospheric quartz fixed-bed. The XRD, XPS, XAFS and magnetic measurement results demonstrate that the Ni–Mo alloy forms in Ni x Mo/MgAl, which inhibits the sintering of metal particles and enhances the degree of coordination unsaturation of metal sites, and subsequently Ni x Mo/MgAl expose more metal sites than Ni/MgAl. The CO 2 -TPD and TPSR reveals than the presence of Mo promotes the adsorption and dissociation of CO 2 , beneficial to DRM and suppressing carbon deposition. Particularly, compared to that on metallic Ni, the graphitic carbon is remarkably suppressed on Ni–Mo alloy own to the charge transfer from Ni to Mo and the isolated Ni ones by the Mo ones. During DRM, Ni x Mo/MgAl are more active than Ni/MgAl, especially Ni 5 Mo/MgAl, which gives the CH 4 and CO 2 conversions of 82.3% and 87.4% at 800 °C, respectively. Also, Ni 5 Mo/MgAl is more stable than Ni/MgAl, and Ni–Mo alloy structure maintains during the reaction and after the regeneration. In addition, the DRM mechanism dominatingly via the HCOO∗ intermediate species is proposed based on in situ DRIFTS and TPSR.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
WeiChi Zhou,XueJiao Ding,WenFu Li,Liang Zhao,YinPeng Lu,MingHao Zhao,FuQiu Ma,ZhiDong Wen,HeXin Zhang,Jing Feng
As a green solution for environmental cleanup, the technology of photocatalysis still suffers from insufficient light absorption and rapid electron-hole recombination. In this study, the copper was deposited on MgO surface by a UV-assisted photodeposition method. It was found that the deposition of copper introduced oxygen vacancies, improved photogenerated charge carrier separation, and enhanced visible light absorption. These improvements were also attributed to the formation of a Schottky barrier and the localized surface plasmon resonance (LSPR) effect of copper species. The synergistic effects of multivalent copper species (Cu 0 , Cu + , Cu 2+ , and Cu 3+ ) and the oxygen vacancies introduced by the deposition of copper significantly promoted the generation of reactive oxygen species (·O 2 ⁻), thereby accelerating the degradation process and enhance the photocatalytic degradation activity toward Rhodamine B (RhB). The 3 %Cu-MgO exhibited the highest photocatalytic efficiency, degrading 92.8 % of RhB within 60 min. The corresponding pseudo-first-order reaction rate constant was 0.04359 min⁻ 1 , approximately twice that of pristine MgO. Notably, 3 %Cu-MgO demonstrated excellent photocatalytic performance over a broad pH range (3.6–10) and maintained good cyclic stability. The study clarifies the multifaceted function of valence-variable copper species in the photo-Fenton process and provides a meaningful reference for the design and exploration of other multivalent metal-based photo-Fenton catalysts in future studies.
研究领域:
环境科学
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光催化
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材料化学
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表面科学
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高级氧化过程
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ming Gui,Jiaxing Cui,Yuzhi Zhang,Wenjuan Liu,Chengfei Zhu,Jie Ding
Paper deacidification protection is a crucial topic that the world is concerned about today, and the key of successful deacidification largely depends on deacidification substance. Here, we systematically synthesized three distinct nano-MgO with spherical, flakey and flower-like morphologies and disclosed their deacidification performance on different ages of papers with in the realm of fluorocarbon solvent. Theoretically, the numerical calculations were performed to explore the adsorption and penetration process of MgO across the paper. The results indicate the dispersibility of nano-MgO in methyl perfluoroisobutyl ether is greatly affected. Flakey MgO has superior dispersibility and deacidification performance due to its high specific surface area and high Zeta potential value, and can still have good performance after dry heat aging, which is conducive to the long-term preservation of paper. In addition, numerical calculation further verified flakey MgO with high surface charge could easy adsorb on the negative-charged paper fiber and penetrate deeply inside the paper. Overall, this work innovatively discusses the deacidification protection properties of MgO with different morphologies on acidified papers, which will help to understand the adaptation relationship between deacidification agents and paper more comprehensively, and also provide a new inspiration for the field of paper protection.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xian Xie,Huxiao Xia,Changtao Wang,Xiong Tong,Chuandong Zhao
The entrainment of Mg-containing chlorite usually occurs during marmatite flotation, which further deteriorates the smelting of zinc concentrate. In this study, the flotation behavior of marmatite and chlorite were investigated, which disclosed that fine-grained chlorite was more floatable and easily entered into zinc concentrate than coarse-grained chlorite. The combined water glass (AWG) and sodium citrate (SC) has been confirmed excellent chlorite depressant, which could decrease the grade of MgO from 3.45 % to 0.31 % in zinc concentrate. XPS and reagent adsorption analysis uncovered that Cu 2+ would not adhere and induce collector ML-8 attach to chlorite surface, meaning the entrainment of chlorite was not caused by activation flotation. The moisture of foam for fine-grained chlorite flotation is much higher than of marmatite, confirming that foam for chlorite flotation is not mineralized, and the collection of chlorites was caused by foam entrainment. Moreover, AWG and SC could selectively adsorb on the chlorite surface and reduce its contact angle to 16.85°. Eventually, SEM-EDS detection further revealed that the entrainment of fine-grained chlorite in zinc concentrate was almost disappeared after using the combined AWG and SC to increase the surface wettability of chlorite. The actual ore flotation further confirmed its excellent inhibitory effect on selectivity.
研究领域:
矿物加工
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浮选化学
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表面化学
·
提取冶金学
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Jiangmin Song,Guanxing Huang,Dongya Han,Qinxuan Hou,Ruinan Liu
High performance and high permeability of reactive materials are crucial issues for the remedy of arsenic (As)-enriched groundwater by permeable reactive barriers. The remediation strategy integrating adsorption and oxidation has gained wide concerns due to its deep removal for As(Ⅲ). In this study, a granular bifunctional nanocomposite MgO-Chitosan-MnO 2 (MgO-CS-MnO 2 ) was fabricated as permeable reactive media for the in-situ remediation for high As groundwater. The needle structure of MnO 2 could provide adequate oxidation sites, furthermore, the multilayer porous characteristic of MgO-CS could also meet higher adsorption capacity. As a result, the estimated maximal adsorption capacity of MgO-CS-MnO 2 for As(Ⅲ) reached to 266.61 mg/g and 578.05 mg/g for arsenate (As(Ⅴ)), which are much higher than current similar adsorbents. The adsorption behaviors of As(Ⅲ/Ⅴ) follow pseudo-second-order kinetic model and Freundlich isotherm model, suggesting that both As(Ⅲ) and As(Ⅴ) are mainly chemisorbed onto MgO-CS-MnO 2 . It could perform effectively in a broad range of pH values (3−11), moreover, competing oxyanions (CO 3 2- , NO - , and SO 4 2- ), organic matters (humic acid) and ion strength exert no significant influence towards As remediation. XPS results revealed As(Ⅲ) adsorbed onto composite completely transformed to As(Ⅴ), and removal mechanisms involved oxidation and metal-O-As(Ⅲ/Ⅴ) complexation. In addition, it can be easily regenerated and recycled maintaining an excellent adsorption and oxidative ability. Besides, Column experiment demonstrated this composite column could effectively treat 1300 and 1700 bed volume (BV) of synthetic As(Ⅲ/Ⅴ)-contaminated groundwater, respectively. Therefore, MgO-CS-MnO 2 have a great potential applicability towards high As groundwater improvement as permeable reactive media.
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