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Surface Modification of (001) facets Dominated TiO2 with Ozone for Adsorption and Photocatalytic Degradation of Gaseous Toluene

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Chinese Journal of Chemical Physics 2019年第5期32卷 611-619页

作者： Yue Yang Zhi-yu Wang Fan Zhang Yi Fan Jing-jing Dong Song Sun Chen Gao Jun Bao National Synchrotron Radiation Laboratory Collaborative Innovation Center of Chemistry for Energy Materials Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes University of Science and Technology of China Hefei 230029 China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing 100191 China School of Chemistry and Chemical Engineering Anhui University Hefei 230601 China Beijing Advanced Sciences and Innovation center Chinese Academy of Sciences Beijing 101407 China

This study investigated the positive effect of surface modification with ozone on the photocatalytic performance of anatase TiO2 with dominated (001) facets for toluene degradation. The performance of photocatalyst was tested on a home-made volatile organic compounds degradation system. The ozone modification, toluene adsorption and degradation mecha-nism were established by a combination of various characterization methods, in situ diuse reectance infrared fourier transform spectroscopy, and density functional theory calculation. The surface modtication with ozone can signiticantly enhance the photocatalytic degradation performance for toluene. The abundant unsaturated coordinated 5c-Ti sites on (001) facets act as the adsorption sites for ozone. The formed Ti-O bonds reacted with H2O to generate a large amount of isolated Ti5c-OH which act as the adsorption sites for toluene, and thus signi- cantly increase the adsorption capacity for toluene. The outstanding photo- catalytic performance of ozone-modified TiO2 is due to its high adsorption ability for toluene and the abundant surface hydroxyl groups, which produce very reactive OH· radicals under irradiation. Furthermore, the O2 generated via ozone dissociation could combine with the photogenerated electrons to form superoxide radicals which are also conductive to the toluene degradation.

关键词： Ozone modification (001) facets Toluene degradation TiO2 In situ diffuse reectance infrared fourier transform spectroscopy

Highly active zigzag-like Pt-Zn alloy nanowires with high-index facets for alcohol electrooxidation

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Nano Research 2019年第5期12卷 1173-1179页

作者： Yanchao Xu Xiaoqiang Cui Shuting Wei Qinghua Zhang Lin Gu Fanqi Meng Jinchang Fan Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOE and Jilin UniversityChangchun 130012China Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

The development of highly efficient Pt-based alloy nanocatalysts is important but remains challenging for fuel cells commercialization.Here,a new class of zigzag-like platinum-zinc (Pt-Zn) alloy nanowires (NWs) with rough surface and controllable composition is reported.The merits of anisotropic one-dimensional nanostructure,stable high-index facets and coordinatively unsaturated Pt sites endow the composition-optimal Pt94Zn6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial Pt black catalysts toward methanol/ethanol oxidation,respectively.Alloying-induced d-band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species,which originally enhances the catalytic activity of Pt-Zn NWs.This study provides a new perspective of Pt-Zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.

关键词： Pt-Zn nanowires zigzag-like high-index facets d-band center strain effects alcohol oxidation

Synthesis of anatase TiO2 with exposed {001} and {101} facets and photocatalytic activity

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Rare Metals 2019年第4期38卷 287-291页

作者： Jia Sun Ming Zhang Zhi-Feng Wang Hai-Yan Chen Ye Chen Naoya Murakami Teruhisa Ohno School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 China Department of Applied Chemistry Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan Testing Center Yangzhou University Yangzhou 225002China Department of Chemical Engineering Yangzhou Polytechnic InstituteYangzhou 225002 China Japan Science and Technology Agency Saitama 3320012 Japan

Anatase titanium(IV) oxide (TiO2) particles with exposed {()01) and {101) facets were prepared by hydrothermal treatment of amorphous TiO2 with H2O2- NH3 solution. Crystal phase, shape, and size of TiO2 particles are found to be greatly dependent on the ratio of H2O2-NH3 solution. The prepared TiOo particles with specific exposed crystal faces show higher photocatalytic activity for acetaldehyde decomposition than commercial spherical TiO^ particles. This result implies that recombination is prevented by spatial separation of redox sites in the particles because of selective migration of electrons and positive holes to specific exposed crystal faces and/or different reactivity of electrons and positive holes on the specific exposed crystal face.

关键词： Anatase {001} and {101} facets H2O2-NH3

Study of Oxygen Vacancies on Different facets of Anatase TiO2

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Chinese Journal of Chemistry 2019年第9期37卷 922-928页

作者： Yanan Wu Yingyi Fu Li Zhang Yuanhang Ren Xueying Chen Bin Yue Heyong He Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200433China

Anatase TiO2 samples with different ratios of {101} to {001} facets were prepared with hydrothermal method and further treated under three specific calcination atmospheres (air,H2,N2).The characterization results indi... 详细信息

关键词： Oxygen Vacancies Different facets Anatase TiO2

Synthesis of S-doped Sb_2O_3 Visible Light-driven Photocatalyst and Its facets-dependent Performance for the Degradation of Methyl Orange

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Chinese Journal of Structural Chemistry 2018年第10期37卷 1603-1611页

作者：薛珲林馨怡陈艺兰陈庆华刘欣萍钱庆荣 College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007China Fujian Key Laboratory of Pollution Control&Resource Reuse Fuzhou 350007China Fujian Provincial Key Laboratory of Ecology-toxicological Effects&Control for Emerging Contaminants Putian UniversityPutianFujian 351100China

S-doped Sb_2O_3 nanocrystals were synthesized using SbCl3 and thioacetamide（TAA） as starting materials by a hydrothermal method and the effects of TAA dosage on the composition and properties of resultant nanocrystals were determined.Their photocatalytic performance was evaluated using the degradation of methyl orange（MO） as a model reaction.The results suggest that TAA dosage can affect the preferential growth direction of Sb_2O_3,and further influences its photocatalytic activity.S doping can extend the optical absorption edge of Sb_2O_3 to the visible light religion,and thus endows its ability to photocatalyze the degradation of MO under visible light illumination.Based on these results,the correlations between the photocatalytic activity of S-doped Sb_2O_3 and the ratio between exposed facets,specific surface area and crystallographic defects were discussed.

关键词： S-doped Sb203 hydrothermal photocatalytic visible light facets

The facets of the Bases Polytope of a Matroid and Two Consequences

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Open Journal of Discrete Mathematics 2018年第1期8卷 14-20页

作者： Brahim Chaourar Department of Mathematics and Statistics Al Imam Mohamed Ibn Saud University (IMSIU) Riyadh Saudi Arabia

Let M be a matroid defined on a finite set E and L?⊂?E?. L is locked in M if??and ?are 2-connected, and . In this paper, we prove that the nontrivial facets of the bases polytope of M are described by the locked subsets. We deduce that finding the maximum-weight basis of M is a polynomial time problem for matroids with a polynomial number of locked subsets. This class of matroids is closed under 2-sums and contains the class of uniform matroids, the Vámos matroid and all the excluded minors of 2-sums of uniform matroids. We deduce also a matroid oracle for testing uniformity of matroids after one call of this oracle.

关键词： Bases Polytope facets Locked Subsets Maximum-Weight Basis Problem Polynomially Locked Matroids Matroid Oracle Testing Unformity of a Matroid

Facet-dependent antibacterial activity of Au nanocrystals

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Chinese Chemical Letters 2020年第12期31卷 3183-3189页

作者： Youkun Zheng Hui Jiang Xuemei Wang State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Drug Discovery Research Center Key Laboratory of Medical Electrophysiology of Ministry of EducationSouthwest Medical UniversityLuzhou 646000China

Engineered nanomaterials have attracted significantly attention as one of the most promising antimicrobial agents for against multidrug resistant infections.The toxicological responses of nano mate rials are closely related to their physicochemical properties,and establishment of a structure-activity relationship for nanomaterials at the nano-bio interface is of great significance for deep understanding antibacterial toxicity mechanisms of nanomaterials and designing safer antibacterial nanomaterials.In this study,the antibacterial behaviors of well-defined crystallographic facets of a series of Au nanocrystals,including{100}-facet cubes,{110}-facet rhombic dodecahedra,{111}-facet octahedra,{221}-facet trisoctahedra and{720}-facet concave cubes,was investigated,using the model bacteria Staphylococcus aureus.We find that Au nanocrystals display substantial facet-dependent antibacterial activities.The low-index facets of cubes,octahedra,and rhombic dodecahedra show considerable antibacterial activity,whereas the high-index facets of trisoctahedra and concave cubes remained inert under biological conditions.This result is in stark contrast to the previous paradigm that the high-index facets were considered to have higher bioactivity as compared with low-index facets.The antibacterial mechanism studies have shown that the facet-dependent antibacterial behaviors of Au nanocrystals are mainly caused by differential bacterial membrane damage as well as inhibition of cellular enzymatic activity and energy metabolism.The faceted Au nanocrystals are unique in that they do not induce generation of reactive oxygen species,as validated for most antibiotics and antimicrobial nanostructures.Our findings may provide a deeper understanding of facet-dependent toxicological responses and suggest the complexities of the na no material-cell interactions,shedding some light on the development of high performance Au nanomaterials-based antibacterial therapeutics.

关键词： Au nanocrystals facets Antibacterial activity Structure-activity relationship Toxicological response

Characterization of tensile fracture in heavily alloyed Al-Si piston alloy

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Progress in Natural Science:Materials International 2011年第5期21卷 380-385页

作者： Guo-hua ZHANG~(1,2),Jian-xin ZHANG~3,Bing-chao LI~3,Wei CAI~1 1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China 2.Shandong Binzhou Bohai Piston Co.,Ltd,Binzhou 256602,China 3.School of Materials Science and Engineering,Shandong University,Ji’nan 250061,China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Shandong Binzhou Bohai Piston Co. Ltd Binzhou 256602 China School of Materials Science and Engineering Shandong University Ji'nan 250061 China

This paper focuses on a typical automotive piston material to characterize its fractographic appearance after tensile rupture. The fracture of this heavily alloyed Al—Si alloy takes place in a brittle manner.The consecutive eutectic zone is found to break by debonding of Si platelets from the Al matrix or by fracturing of Si platelets.The various intermetallic particles break up complicatedly under the stress field of the propagating crack.The fracture tends to pass through or approach to the boundary between the eutectic Al matrix and Si platelets and there is a strong interaction between the propagating crack and the obstructing intermetallic compound.A tensile fracture mechanism in the heavily alloyed Al-Si alloy is elucidated.

关键词： tension test aluminum alloys facets fracture

多面Rasch模型facets分析软件的控制数据文件生成与应用研究

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考试研究 2019年第5期15卷 68-78页

作者：郭婉瑢蔡旻君欧阳鑫颖西北师范大学教育技术学院深圳市腾讯计算机系统有限公司广东深圳518057

多面Rasch模型(MFRM)是Rasch单参数模型的延伸,对于检测不同测量层面一致性差异具有很好的支持作用。本文聚焦于运用多面测量模型的分析软件facets,重点阐述如何利用TXT数据文件和Excel数据文件生成控制数据文件的方法步骤。力求通过详... 详细信息

多面Rasch模型(MFRM)是Rasch单参数模型的延伸,对于检测不同测量层面一致性差异具有很好的支持作用。本文聚焦于运用多面测量模型的分析软件facets,重点阐述如何利用TXT数据文件和Excel数据文件生成控制数据文件的方法步骤。力求通过详细的过程介绍并配合图文说明,使学习者对facets控制数据文件生成有更加清晰的认识,为后续应用Rasch模型开展数据分析奠定基础。

关键词：多面Rasch模型 facets 控制数据文件应用