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Preparation of TiO_2-moo_3 nano-composite photo-catalyst by supercritical fluid dry method

第十五届海峡两岸气胶技术研讨会

作者： Wei Chieh Chung Yun En Li moo Been chang Graduate Institute of Environmental Engineering "Central University"

Human activities including fossil fuel combustion,agriculture and husbandry lead to increasing anthropogenic emission of greenhouse gases(GHGs).Emission of GHGs including CO and CH has resulted in global warming and climate *** a result,effective reduction of CO and CH emissions is an urgent issue in 21 st *** dioxide utilization can be a candidate to effectively reduce CO emission and reforming of CO/CH-4 mixture stands for a potential carbon dioxide utilization technique and possesses capability to generate the energy carrier,syngas(mixture of H/CO).Among several reforming techniques,photocatalytic conversion of CO/CH is a promising approach since the driving force of the system is solar energy,the most abundant energy and the advantage of easy ***-type photocatalyst has the advantages of high resistivity toward photocorrosion and easy *** this study,perovskite-type photocatalyst(La eO) is prepared to convert CO/CH mixture into syngas with an irradiance of Xenon *** show that the self-prepared photocatalyst has a bandgap of 2.06 eV and can absorb visible light during ***,our photocatalysis system can effectively convert CO/CH into syngas and the conversion rate increase with increasing irradiance as shown in Figure *** information and relevant mechanisms will be presented and elucidated in this paper.

关键词： greenhouse gases reforming of CO2 photocatalysis Themes Alternative studies related to aerosol greenhouse gas and air

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Journal of Environmental Sciences 2005年第2期17卷 350-352页

作者： ZHANGJing-chang LIQing CAOWei-liang

A series of TiO 2-moo 3 nano-composite photocatalysts were prepared by supercritical fluid dry method(SCFD) and an impregnation technique with TiCl 4 and (NH 4) 6Mo 7O 24 ·4H 2O as the starting materials. The catalysts were characterized by the means of XRD, TEM and UV-Vis. Methyl orange was used as model compound for the evaluation of their catalytic activities. The results indicated that the photo-catalyst prepared by SCFD had the advantages of small size(12.84 nm), narrow distribution and good dispersivity. The presence of small amount of Mo in composite catalyst gives rise to the red shift of its absorbance wavelength, decrease of its energy gap and increase of the utility of visible light. Furthermore, higher surface acidity of the photo-catalyst was obtained as the result of the addition of moo 3. Compared with pure TiO 2, the catalytic activity of the TiO 2-moo 3 nano-composite photo-catalyst was improved significantly. As the doping concentration of the composite catalysts was controlled at 0.6%(molar percentage), 100% degradation of methyl orange was achieved with in 1.2 h irradiation time.

关键词： TiO 2 moo 3 photocatalytic supercritical fluid dry method

Comparative Study of Imaging Characteristics of I-125 Imaging Using the Siemens Inveon Scanner and Siemens Symbia TruePoint

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Journal of Biomedical Science and Engineering 2015年第10期8卷 674-683页

作者： Young Jun Kim Ilhan Lim A Ram Yu Byung Il Kim chang Woon Choi Sang moo Lim Jin Su Kim Molecular Imaging Research Center Korea Cancer Center Hospital Korea Institute of Radiological and Medical Sciences (KIRAMS) Seoul Korea Department of Nuclear Medicine Korea Cancer Center Hospital Korea Institute of Radiological and Medical Sciences (KIRAMS) Seoul Korea Korea Drug Development Platform Using Radio-Isotope (KDePRI) Seoul Korea Radiologcial and Medico-Oncological Sciences University of Science and Technology (UST) Seoul Korea

Objective: Although Iodine-125 (125I) has been widely used for in vitro studies because of its relatively long half-life (60.1 days), 125I imaging is limited because of its low energy (27 - 35 keV), even in an animal-dedicated system. In this study, imaging characteristics of 125I were assessed using a small animal-dedicated imaging system and clinical scanner. Methods: Using the Siemens Inveon and Siemens Symbia TruePoint systems, imaging characteristics such as resolution, sensitivity, and image quality were compared. Mouse high resolution (MHR-0.5), mouse general purpose (MGP-1.0), and mouse high sensitivity (MHS-2.0) collimators were used for the Inveon scanner, and low energy high-resolution (LEHR) and low energy all-purpose (LEAP) collimators were used for the Symbia TruePoint. For animal imaging, 16.8 MBq of 125I was administered to BALB/c mice intravenously, and the planar image and single-photon emission computed tomography (SPECT) were obtained using both scanners. Results: The resolution of 125I for the Inveon scanner was 3.98 mm full width at half maximum (FWHM) at a 30-mm distance with the MHR-0.5 collimator, and the value of Symbia scanner was 8.72 mm FWHM at a 30-mm distance with the LEHR collimator. The sensitivity of 125I for the Inveon scanner was 21.87 cps/MBq, and the value for the clinical scanner was 30.55 cps/MBq. The planar images of mice were successfully obtained at the level of evaluating specific binding in both scanners. Conclusion: 125I small animal imaging can be achieved with a clinical scanner. This result may enhance the utilization of 125I small animal imaging using a clinical scanner.

关键词： I-125 Animal Imaging Performance Measurement

X-ray Photoemission Spectroscopy Studies of the Semiconducting Molybdenum Purple Bronze Bi_(0.2)moo_3

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Journal of Materials Science & Technology 2006年第4期22卷 487-490页

作者： Rui XIONG chang LUO Wufeng TANG Jing SHI Department of Physics Wuhan University Wuhan 430072 China International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The electronic structure of the quasi-two-dimensional （2D） semiconducting molybdenum purple bronze Bio.2moo3 was presented by X-ray photoemission spectroscopy. The valence band of Bio.2moo3 is made up of Opπ nonbonding level, π and a bonding bands. The peak at 1.5 eV and the shoulder at 0.5 eV in the forbidden band may be formed from the non-bonding dxy orbitals of some Mo atoms. The O1s core-level spectrum demonstrates the presence of two inequivalent bonds of oxygen ions in Bio.2moo3. Bi4f core-level spectrum shows two bonding characters of Bi atoms in bismuth molybdenum single crystal. Mo3d core-level spectrum confirms two kinds of valence states of Molybdenum （Mo^＋5 and Mo^＋6）. Ar^＋ ion irradiation induces more significant distortion of moo6 octahedra.

关键词： Bi0.2moo3 single crystal X-ray photoemission spectroscopy Core-electron spectrum

Hydrothermal Synthesis, Structural Characterization and Properties of Mixed Valent Decavanadium Oxide [Co_2Cl_8V_(10) O_(18)(H_2O)]Cl_2·6H_2O with Novel Three-dimensional Framework

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Chemical Research in Chinese Universities 2003年第2期19卷 135-139页

作者： WU Ping song XU Lin WANG En bo HU chang wen Faculty of Chemistry Northeast Normal UniversityChangchun 130024P.R.China

Decavanadium oxide [Co 2Cl 8V 10 O 18 (H 2O)]Cl 2·6H 2O was synthesized hydrothermally with NH 4VO 3, Na 2moo 4·2H 2O, H 3PO 4(85%), CoCl 2·6H 2O and hexamethylenetetraamine. The X ray diffraction analysis showed that [Co 2Cl 8V 10 O 18 (H 2O)]Cl 2·6H 2O crystallized in a monoclinic crystal system, the space group was C2/m with cell parameters a =1 6065(3) nm, b =2 2699(5) nm, c =1 3897(3) nm, β = 125.29(3)°, V =4 1363(14) nm 3, Z =2 and the final R =0 06, wR =0 1926. Its crystal structure is a 3 D open framework constructed by VO x polyhedra and CoCl 4 tetrahedra with channels along the crystallographic axes a, b, and c .

关键词： Hydrothermal synthesis Polyoxometalate Crystal structure

Metal oxyacid salts-confined pyrolysis towards hierarchical porous metal oxide@carbon(MO@C)composites as lithium-ion battery anodes

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Nano Research 2023年第5期16卷 6903-6913页

作者： Huizhong Xu chang Gao Zhaoyang Cheng Linghui Kong Wei Li Xiaochen Dong Jianjian Lin Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science Ministry of Education(MOE)Shandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Engineering Research Center of High Performance Polymer and Molding Technology Ministry of EducationQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211800China

Transition metal oxides(TMOs)have been thought of potential anodic materials for lithium-ion batteries(LIBs)owing to their intriguing ***,the limited conductivity and drastic volume change still hinder their practical ***,a metal oxyacid salts-confined pyrolysis strategy is proposed to construct hierarchical porous metal oxide@carbon(MO@C,MO=moo_(2),V_(2)O_(5),WO_(3))composites for solving the aforementioned problems.A water-evaporation-induced self-assembly mechanism has been put forward for fabricating the MO@polyvinyl pyrrolidone(PVP)@SiO_(2)*** the following pyrolysis and etching process,small MO nanoparticles can be successfully encapsulated in the hierarchical porous carbon *** from the synergistic effect of MO nanoparticles and highly conductive carbon framework,MO@C composites show excellent electrochemical *** example,the as-obtained moo_(2)@C composite exhibits a large discharge capacity(1513.7 mAh·g^(−1)at 0.1 A·g^(−1)),good rate ability(443.5 mAh·g^(−1)at 5.0 A·g^(−1)),supernal long-lived stability(669.1 mAh·g^(−1)after 1000 cycles at 1.0 A·g^(−1)).This work will inspire the design of novel anode materials for high-performance LIBs.

关键词： transition metal oxides hierarchical porous carbon framework anode materials lithium storage performance

生长硼酸铝钕晶体的高温熔液体系的挥发动力学

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化学学报 1986年第8期44卷 775-780页

作者：陈长康中国科学院福建物质结构研究所福州

用热天平法在不同的恒温温度、时间和降温速度条件下测定了助熔剂体系K2SO4-moo3和晶体生长体系Nd2O3-Al2O3-H3BO3-K2SO4-moo3的熔剂挥发情况,提出了挥发一级动力学模型,并用方程的近似解对挥发过程进行了解析,取得了与实验一致的结果.... 详细信息

用热天平法在不同的恒温温度、时间和降温速度条件下测定了助熔剂体系K2SO4-moo3和晶体生长体系Nd2O3-Al2O3-H3BO3-K2SO4-moo3的熔剂挥发情况,提出了挥发一级动力学模型,并用方程的近似解对挥发过程进行了解析,取得了与实验一致的结果.在恒温条件下,相对挥发量与挥发时间成正比,挥发速率常数与温度关系遵从Arrhenius方程,求得的熔剂体系的挥发活化能为128.7kJ·mol-1.在匀速降温条件下,整个挥发过程的规律取决于挥发温度函数f（x）,f（x）可以从恒温热重分析或变温热重分析实验中求得.

关键词：挥发量助熔剂媒熔剂挥发动力学降温速度晶体

Synthesis and characterization of Pt-moo_x-TiO_2 electrodes for direct ethanol fuel cells

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 594-599页

作者： Xiu-yu Wang Jing-chang Zhang Xu-dong Cao Yuan-sheng Jiang Hong Zhu Institute of Modem Catalyst State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Chemical Engineering University of Ottawa Ottawa 660673399 Canada School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

To enhance the CO-tolerance performance of anode catalysts for direct ethanol fuel cells,carbon nanotubes were modified by titanium dioxide （donated as CNTs@TiO2） and subsequently served as the support for the preparation of Pt/CNTs@TiO2 and Pt-Mo/CNTs@TiO2 electrocatalysts via a UV-photoreduction *** physicochemical characterizations of the catalysts were carried out by using X-ray diffraction （XRD）,transmission electron microscopy （TEM）,X-ray photoelectron spectroscopy （XPS）,and infrared spectroscopy of adsorbed probe ammonia *** electrocatalytic properties of the catalysts for methanol oxidation were investigated by the cyclic voltammetry *** results show that Pt-Mo/CNTs@TiO2 electrode exhibits the highest performance in all the *** is explained that,the structure,the oxidation states,and the acid-base properties of the catalysts are influenced due to the strong interaction between Ti and Mo species by adding TiO2 and moox to the Pt-based catalysts.

关键词： direct ethanol fuel cell acidity metal oxides electrocatalysts methanol oxidation electrochemical properties carbon naotubes

Methanol Oxidation over TiO_2-modified Multi-walled Carbon Nanotubes Supported Pt-Mo Electrocatalyst

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Chemical Research in Chinese Universities 2011年第3期27卷 486-489页

作者： WANG Xiu-yu JIANG Yuan-sheng ZHU Hong ZHANG Jing-chang Institute of Modern Catalyst Beoing University of Chemical TechnologyBeo＇ing 100029 P. R. China School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 P. R. China

In order to develop a novel and high-performance catalytic material for direct methanol fuel cells（DMFC）, molybdenum oxide as a co-catalyst with Pt on multi-walled carbon nanotubes which were modified by titanium dio-xide（denoted as CNTs@TiO2） was investigated. The physicochemical characterizations of the catalysts were carried out via X-ray diffraction（XRD）, transmission electron microscopy（TEM） and X-ray photoelectron spectroscopy（XPS）. Cyclic voltammetry（CV） showed that the CO-tolerance performance increased in the sequence of Pt/CNTs Pt/CNTs@TiO2Pt-Mo/CNTs@TiO2. The improved CO-tolerance performance of the Pt-Mo/CNTs@TiO2 catalyst can be attributed to the combined beneficial effects of highly dispersed Pt nanoparticles on the CNTs, the existence of oxygen holes in the moo3 layer structure and the oxidation capability of TiO2.

关键词： Methanol oxidation Direct methanol fuel cell Molybdenum oxide Platinum