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Bio-inspired high-efficiency photosystem by synergistic effects of core-shell structured Au@CdS nanoparticles and their engineered location on{001}facets of SrTiO_(3)nanocrystals

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Journal of Materials Science & Technology 2023年第5期136卷 159-168页

作者： Wenxuan Wang Wenhao Chi Zhaoyong Zou Pengchao Zhang Kun Wang Ji Zou Hang Ping Jingjing Xie Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Natural photosynthesis,which provides a green and high-efficiency energy conversion path by spatial separation of photogenerated carriers through combined actions of molecules ingeniously arranged in an efficient solar nanospace,highlights the importance of rational nanostructure design to realize artificial high-efficiency photosystem.Inspired by these unique features,we constructed a high-efficiency ternary photosystem by selectively decorating the{001}facets of 18-facet SrTiO_(3)with Au@CdS photosensitizers via a green photo-assisted method.Benefiting from the dual-facilitated charge carriers transportation in core-shell structured Au@CdS heterojunction and well-faceted 18-facet SrTiO_(3)nanocrystal,such a photo-catalyst could realize the effective spatial separation of photogenerated electrons and holes.As expected,the 18-facet SrTiO_(3)/Au@CdS photocatalyst exhibits superior activity in visible-light-driven photocatalytic hydrogen evolution(4.61 mmol h^(−1)g^(−1)),166%improvement in comparison with randomly deposited Au@CdS(1.73 mmol h^(−1)g^(−1)).This work offers new insight into the development of green and high-efficiency photocatalytic systems based on the rational nanostructure design by crystal facet engineering.

关键词： Au@CdS composites core-shell 18-facet SrTiO_(3) Photogenerated carrier separation Crystal facet engineering Hydrogen production

Developing core-shell Nano-Structures in FeCrAl-ODS Ferritic Alloys with the Co-Addition of Ni and Zr

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 364-372页

作者： Wenquan Ding Jieli Ma Yong Jiang Yiren Wang Huiqun Liu Key Laboratory for Nonferrous Materials of Ministry of Education School of Materials Science and EngineeringCentral South UniversityChangsha410083China National Key Laboratory for Powder Metallurgy Central South UniversityChangsha410083China

A new Ni+Zr co-alloyed FeCrAl-ODS(oxide-dispersion-strengthened)ferritic alloy was fabricated by ball-milling and hot-isostatic-pressing.Using electron microscopy and atom probe tomography,the dispersive formation of high density core-shelled nano-particles of various sizes was confirmed with a common B2-NiAl shell.Among which,median-sized nano-particles(20-50 nm)typically have an Y_(4)Al_(2)O_(9)nano-core ofcore ofcore and a few ultra-fine Y_(4)Zr_(3)O_(12)nano-oxides.All these nano-phases were highly coherent with the ferritic matrix.No large Y--Al-O nano-oxides were formed.The total number density of ultra-fine nano-particles was estimated as~2×10^(23)m^(-3)with a mean size of 6.3 nm only,and accordingly,the new alloy achieved an excellent combination of strength and ductility at high temperatures.

关键词： FeCrAl Oxide-dispersion-strengthened(ODS)alloy Mechanical alloying Nano-oxides core-shell

Template-free synthesis of core-shell Fe_(3)O_(4)@MoS_(2)@mesoporous TiO_(2) magnetic photocatalyst for wastewater treatment

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 177-191页

作者： Jingshu Yuan Yao Zhang Xiaoyan Zhang Liang Zhao Hanlin Shen Shengen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48824USA

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(<5%of sunlight),low charge separation efficiency,and difficulties... 详细信息

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(shell further boost the photocatalytic efficiency of FMmT.This work provides a new approach and some experimental basis for the design and performance improvement of magnetic photocatalysts by innovatively incorporating MoS2 as the active interlayer and integrating it with a mesoporous shell.

关键词： core-shell MoS2 mesoporous TiO2 photocatalytic degradation heterojunction magnetic recycling

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

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颗粒学报:英文版 2023年第6期77卷 62-70页

作者： Lichen Zhang Shuo Wang Xing Su Xiaodong Li Meishuai Zou School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition temperature.In this study,the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method,and 3-Perfluorohexyl-1,2-epoxypropane(PFHP)(F3C(CF2)5CH2C2H3O)was coated to form a uniform and controllable core-shell Al@PFHP.The core-shell AI@PFHP showed better thermal reaction and ignition performance.The exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times,with lower ignition temperature(reduced by about 140℃)and longer burning duration(increased by about 1.5 times)after coating with PFHP,compared with raw aluminum powder.In addition,the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.

关键词： Aluminumpowder core-shell 3-Perfluorohexyl-1 2-Epoxypropane Combustion

A core-shell composite pigment with rutile TiO_(2) intensification for UV inhibition

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Particuology 2022年第8期20卷 18-26页

作者： Xiao Lv Baowei Yan Yuanyuan Shao Haiping Zhang Hui Zhang Jesse Zhu Cllaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering and TechnologyTionjin UniversityTianjin 300350China Department of Chemical and Biochemical Engineering.Western Universiy Ontario N6A 589Canada

Organic pigments generlly have bright colors but poor ultraviolet(UV)resistance.To improve the UV for UVinhibition is proposed by afacile sol-gel method inthis work.Acore-shellstructure,witha homo resistance and extend the applications,a core-shell composite pigment with rutile Tio intensification geneous sol-gel TiO_(2) shell containing additional nanosized rutile TiO2 particles and with the pigment as the core,was established taking advantage of UV resistance of TiO2 and binding ability of sol-gel.While the sol-gel TiO2 shell alone has already shown obvious ultraviolet shielding effect,as tested over different sol-gel aging times and Tio2 loadings,the UV resistance of the fluorescent pigments was further enhanced by binding the nanosized rutile TiO2 in the sol-gel shell At a sol-gel TiO2 to rutile TiO2 ratio of 2:1,the UV exposure time is extended about eight times compared with that of the original pigment and twice as that of the modifed pigment with pure sol-gel TiO2 for the same color change.Therefore,the novel core-shell composite pigment intensified with nanosized rutile Tio2 particles is proved to be effcient in improving the uV resistance of organic pigments.

关键词： Sol-gel RutileTiO_(2) Organic pigment core-shell UV resistance Powder coating

Preparation of the core-shell HMX@CS microparticles by biological excitation:Excellent hydrophobic-oleophilic properties and decreased impact sensitivity effectively

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Defence Technology（防务技术） 2022年第5期18卷 855-861页

作者： Yue-qi Li Heng Zhai Ping Ye Xing-quan Zhang Chang-ping Guo Sichuan Co-Innovation Center for New Energetic Materials Southwest University of Science and Technology(SWUST)Mianyang621010PR China Analysis and Testing Center of Southwest University of Science and Technology(SWUST) Mianyang621010PR China

Inspired by the phenomenon of superhydrophobic plants and animals in nature,1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX)@copper stearate(CS)core-shell composites with similar properties was prepared.A rough shell layer on the surface of the HMX was observed by scanning electron microscopy(SEM),and a series of in-depth characterization confirmed the successful generation of CS and the coreshell structure of the samples.Differential scanning calorimeter(DSC)proves that the crystal transition temperature(204℃)and high temperature decomposition exothermal temperature(284℃)of HMX@CS is almost unchanged compared with pure HMX,which means HMX and CS have good compatibility.Then,the H50 of the samples also increased continuously(16.6 cm→33.7 cm)when the CS shell content increased from 1%to 5%,indicating that the CS shell has a certain buffering performance,and CS will absorb some heat and melt under the stimulation of impact due to its low melting point,which improved impact sensitivity of HMX effectively further.Moreover,HMX@CS has excellent hydrophobic and oleophilic performance,shows excellent wettability with lipid binder,and samples with appropriate CS shell content can continue to combustion stably after covering water.This waterproof and low sensitivity coating provides a new way for the development of multifunctional energetic materials.

关键词： HMX core-shell Sensitivity Hydrophobic-oleophilic Mechanical properties

Synthesis of a Magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) Catalyst and Its Application in Aerobic Olefin Epoxidation

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Chemical Research in Chinese Universities 2023年第6期39卷 1044-1050页

作者： HOU Junying HOU Chuanyuan LI Jianchang HAO Jianjun College of Mechanical and Electrical Engineering Hebei Agriculture UniversityBaoding 071001P.R.China

Olefin epoxidation is a fundamental reaction in organic chemistry.Herein,a novel magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) metal-organic framework(MOF)heterogeneous catalyst was synthesized for the use in olefin epoxidation.Additionally,the size selectivity of the Fe_(3)O_(4)@Cu_(3)(BTC)_(2) catalyst in olefin epoxidation was investigated.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)results indicated that Fe_(3)O_(4)@Cu_(3)(BTC)_(2) presented a microsphere morphology,and Cu_(3)(BTC)_(2) MOFs were well dispersed on the Fe_(3)O_(4)(PAA)surface after 10 cycles of the synthesis process.The synthesized magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) heterogeneous catalyst could facilitate efficient aerobic olefin epoxidation.Furthermore,the catalyst was used in the aerobic oxidation of alcohols and was found to exhibit excellent activity for primary alcohols.

关键词： core-shell Metal-organic framework(MOF) Heterogeneous catalyst Molecular oxygen Olefin epoxidation Alcohol oxidation

core-shell-structured Composite ZSM-5@MCM-41 Catalysts:Fabrication,Characterization,and Enhanced Performance in Hexane Catalytic Cracking

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China Petroleum Processing & Petrochemical Technology 2023年第4期25卷 41-51页

作者： Zhu Jiale Zhu Xuedong Yang Fan State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science&TechnologyShanghai 200237China

A series of core-shell zeolites with a ZSM-5 zeolite core and a MCM-41 shell with varying shell thicknesses were successfully fabricated via a cetyltrimethylammonium bromide(CTAB)-directed sol-gel coating method in an ultradilute solution. Extensive characterization techniques, including XRD, TEM, N_(2) adsorption-desorption, NH_(3)-TPD, and IR measurements, confirmed the successful coating of a microporous ZSM-5 core with a mesoporous MCM-41 shell layer and were further employed to explore the textural properties and acidic properties of the samples. The hexane cracking results revealed a significant enhancement in olefin yields after introducing the MCM-41 shell to ZSM-5. Interestingly, a volcanic trend in olefin yields was observed with the increase in the shell thickness. In particular, the highest olefin yield of 51.5%, exceeding that of the core catalyst by 17.1%, was achieved when the shell thickness was controlled at 40 nm.Moreover, the catalyst lifetime investigation revealed that the core-shell composite catalyst exhibited a minimal reduction in hexane conversion of merely 3.8% over a 120 h reaction period, significantly outperforming the 11.3% reduction exhibited by the core catalyst. This remarkable catalytic performance was attributed to the passivation of external acid sites and the introduction of more developed pore channels by the shell, which effectively mitigated unwanted side reactions. The successful synthesis of these core-shell structured catalysts presents a novel strategy for improving catalytic performance in hexane cracking, in addition to serving as a solid foundation for the design of industrial catalysts for light naphtha cracking.

关键词： catalytic cracking light olefin core-shell ZSM-5 zeolite

Purification of starch and phosphorus wastewater using core-shell magnetic seeds prepared by sulfated roasting

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Journal of Environmental Sciences 2019年第7期31卷 4-16页

作者： Chunjie Du Jinsheng Yu Wei Sun Haisheng Han Yuehua Hu Pan Chen Panpan Hou Runqing Liu Li Wang Yue Yang Ruohua Liu Lei Sun School of Minerals Processing and Bioengineering Central South University Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South University

core-shell magnetic seeds with certain adsorption capacity that were prepared by sulfated roasting, served as the core of a magnetic separation technology for purification of starch wastewater. XRD and SEM results indicate that magnetite's surface transformed to be porous α-Fe_2O_3 structure. Compared with magnetite particles, the specific surface area was significantly improved to be 8.361 from 2.591 m^2/g, with little decrease in specific susceptibility. Zeta potential, FT-IR and XPS experiments indicate that both phosphate and starch adsorbed on the surface of the core-shell magnetic seeds by chemical adsorption, which fits well with the Langmuir adsorption model. The porous surface structure of magnetic seeds significantly contributes to the adsorption of phosphate and starch species, which can be efficiently removed to be 1.51 mg/L(phosphate) and 9.51 mg/L(starch) using magnetic separation.

关键词： core-shell magnetic seeds Sulfated roasting Phosphate Starch Purification