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Synthesis of CdS/m-Ti02 mesoporous Spheres and Their Application in Photocatalytic Degradation of Rhodamine B Under Visible Light

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Chemical Research in Chinese Universities 2017年第3期33卷 436-441页

作者： CUI Shu LI Xuesong LI Yanjuan ZHAO Haixin WANG Yuanyuan LI Nan LI Xiaotian LI Guodong Key Laboratory of Automobile materials Ministry of Education College of Material Science and Engineering Jilin University Changehun 130012 P. R. China School of Physics Tonghua Normal University Tonghua 134002 P R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

CdS/m-TiO2 heteroarchitecture with CdS nanocrystals loaded on mesoporous TiO2（m-TiO2） spheres was successfully synthesized via sol-gel method followed by solvothermal treatment. The material with uniform diameter of ca. 750 nm possesses regular mesoporous structure and large specific surface area of 100.5 m2/g. When used to photodegradate Rhodamine B（RB） under visible light, the CdS/m-TiO2 heteroarchitecture exhibits improved photo-catalytic performance in comparison with pure m-TiO2 or CdS. The excellent photocatalytic activity is closely related to the facilitated separation of electron-hole pairs derived from the CdS/m-TiO2 heterojunction and mesoporous structure with high specific surface area and adequately exposed active sites.

关键词： Cadmium sulfide Titanium dioxide Heteroarchitecture mesoporous material Photocatalysis Visible light

Understanding on the Surfactants Engineered Morphology Evolution of Block Copolymer Particles and Their Precise mesoporous Silica Replicas

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Chemical Research in Chinese Universities 2022年第1期38卷 99-106页

作者： YANG Shaobo CAO Yuanyuan WANG Shuqi LI Yongsheng SHI Jianlin Lab of Low-Dimensional materials Chemistry Key Laboratory for Ultrafine Materials of Ministry of EducationFrontier Science Center of the Materials Biology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237P.R.China Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003P.R.China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050P.R.China

Surfactant-directed block copolymer(BCP) particles have gained intensive attention owing to their attractive morphologies and ordered domains. However, their controllable fabrication suffers several limitations including complex design and synthesis of multiple surfactant systems, limited choices of block copolymers, and time-consuming post-processes, etc. Herein, a surfactant size-dependent phase separation route is proposed to precisely manipulate the architectures of the anionic block copolymer particles in the binary co-assembly system of BCP and surfactants. In the system of polystyrene block polyacrylic acid (PS-b-PAA) and quaternary ammonium surfactants, it is verified that facile control on the ordered phase separation structures and morphologies of BCP particles can be achieved via simply varying the alkyl lengths of the surfactants. The cationic surfactants are demonstrated participating in the fabrication of the internal structures of BCP particles. Especially, it is found that the cationic surfactants are integrate into the anionic polyacrylic acid(PAA) domain of BCP particles of PS-b-PAA to influence the volume fraction of PAA blocks, so that varied architectures of BCP particles are constructed. Based on these understandings, spherical or ellipsoidal BCP particles are obtained as expected, as well as their precisely inorganic mesoporous silica replicas through the block copolymer nanoparticle replicating route. More interestingly, the ellipsoidal mesoporous silica exhibits higher cellular internalization capability due to its lower energy expenditure during the internalization process, which presents promising potentials in biomedical applications, especially for high-efficient drug delivery systems. These findings may provide valuable insights into the confinement assembly of anionic block copolymers and the creation of special nanocarriers for high-efficiency biomacromolecule delivery in the biomedical community.

关键词： Binary co-assembly Block copolymer Surfactant Morphology evolution mesoporous material

Synthesis and Characterization of Ordered mesoporous Aluminosilicate Molecular Sieves with High Stability in High-Temperature Steam

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Chinese Journal of Chemistry 2007年第5期25卷 635-639页

作者：罗永明候昭胤金顶峰郑小明 Institute of Catalysis Department of Chemistry Zhefiang University (Xixi campus) Hangzhou Zhejiang 310028 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming Yunnan 650093 China

The ordered mesoporous aluminosilicate molecular sieve （MASMS-1） stable in the high-temperature steam has been successfully synthesized from the assembly of diluted ZSM-5-type precursor with mesoporous MCM-41. The material was characterized by XRD, N2 adsorption-desorption, FE-SEM, TEM, FT-IR spectroscopy and 27A1 MAS NMR techniques. This mesoporous material shows high stability in the high-temperature steam [H2O （φ=20%） in N2 at 800 ℃ for 4 h], which might be ascribed to the synergistic effect of both thick walls containing zeolite-like five-membered ring subunits and highly condensed surface silanol groups.

关键词： aluminosilicate molecular sieve ZSM-5-type precursor high-temperature steam stability mesoporous material synthesis and characterization

Synthesis of mesoporous Cu-Mn-Al_2O_3 materials and Their Applications to Preferential Catalytic Oxidation of CO in a Hydrogen-rich Stream

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Chemical Research in Chinese Universities 2010年第1期26卷 105-109页

作者： FANG De-ren REN Wan-zhong LIU Zhong-min XU Xiu-feng ZHANG Hui-min LIAO Wei-ping Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China Institute of Applied Catalysis Yantai University Yantai 264005 P. R. China

A series of mesoporous Cu-Mn-Al2O3（CMA） materials was synthesized at moderate temperature and their structures were characterized by XRD, N2 physical adsorption and TPR techniques. It was found that using metal complex ion[Cu（NH3） 4^2＋-Mn（NH3）6^2＋] as raw materials is easier to form good-structure mesoporous Cu-Mn-Al2O3 materials than using its nitrate salt [Cu（NO3）2-Mn（NO3）2]. The TPR tests results indicate that CuO and MnOx were homogeneously dispersed in the mesoporous materials. Their catalytic application to preferential catalytic oxidation of CO in a hydrogen-rich stream was studied. The activity varies in the order of CMA（1：1, molar ratio）〉 CMA（1：2）〉CMA（2：1）〉CMA（CP）〉CMA（1：0）≈CMA（0：1）. The CMA（1：0） and CMA（0：1） have lower activity compared to other samples, implying that there existed coordination effect between Cu-Mn in the samples. The selectivity varied in the order of CMA（0：1）≥CMA（1：2）〉CMA（1：1）〉CMA（2：1）〉CMA（1：0） at higher temperature （≥ 120 ℃）, indicating that increasing the Cu content enhanced the conversion of H2. The sample CMA（CP） made by coprecipitation method has a lower CO oxidation activity and selectivity than its counter-parts of mesoporous Cu-Mn-Al2O3 materials[CMA（1：2）], this attributed to the lower surface area of the former and poor interaction of CuO with MnOx.

关键词： Cu-Mn-Al2O3 mesoporous material Selective CO oxidation Hydrogen-rich Catalyst

Photocatalytic Degradation of Imidacloprid by Phospho- tungstic Acid Supported on a mesoporous Sieve MCM-41

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Chinese Journal of Chemistry 2012年第1期30卷 127-132页

作者：冯长根李彦周刘霞 School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China College of Science China Agricultural UniversityBeijing 100094China

Solid catalysts consisting of polyoxometalates （POM） namely phosphotungstic acid H3PWL2040 （HPW） supported on a mesoporous sieve MCM-41 have been prepared and characterized by FT-IR, X-ray diffraction, nitrogen adsorption and high resolution transmission electron microscope （HRTEM）. The HPW/MCM-41 with different HPW loadings from 10 to 60 wt% possess large specific surface area and rather uniform mesopores. Keggin structure of HPW retains on the prepared composite catalysts. The photocatalytic performance of HPW/MCM-41 was examined by degradation of a durable pesticide imidacloprid. It is found that the prepared photocatalysts exhibit high activity under irradiation of 365 nm monochromatic light. For 50 mL of imidacloprid （10 rag/L）, conversion of imidacloprid using 20 mg of HPW/MCM-41 with 50 wt% loading level and calcined at 300 ℃ reaches 58.0% after 5 h irradiation.

关键词： polyoxometalates photocatalysis degradation immobilization mesoporous material imidacloprid,pesticide

Synthesis of micron-sized hollow silica spheres with a novel mesoporous shell of MCF

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Chinese Chemical Letters 2009年第7期20卷 852-856页

作者： An Feng Zhang Yong Chun Zhang Na Xing Ke Ke Hou Jing Wang Xin Wen Guo State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116012 China

Micron-sized hollow silica spheres whose shells are made up of mesocellular silica foams （MCFs） have been synthesized by one-pot sol-gel method in benzene/water/P123 emulsion. The material is characterized with SEM, TEM, BET and ^29Si MAS NMR. The results show that the MCFs of the unique shell of hollow silica spheres were connected by large windows with a narrow distribution of - 10 nm in diameter, the inner space of the hollow sphere is accessible. And the formation mechanism of the hollow silica spheres is proposed. C 2009 Xin Wen Guo. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Hollow spheres MCF mesoporous material

Synthesis and Electrochemical Properties of Semicrystalline Gyroidal mesoporous MnO2

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Chinese Journal of Chemistry 2006年第7期24卷 835-839页

作者：周琴李想李彦光李博之赵东元江志裕 Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

mesoporous silica KIT-6 has novel three-dimensional gyroidal channel structure, space group of 1a-3d, and ordered tunable pores up to 10 nm. In this paper, such mesostructured silica was employed as hard template to prepare semicrystalline gyroidal mesoporous MnO2. The structure was investigated by XRD, TEM and HRTEM, and found to be of high quality 1a-3d symmetry, in good accordance with the template structure. The material has a BET surface of 118 m2·g^-1 and pore volume of 0.35 cm3·g^- 1 after eliminating template. mesoporous MnO2 has shown good electrochemical property as supercapacitor material in 1 mol·L^-1 Na2SO4 and 1 mol·L^-1 LiClO4 solutions, but interesting pseudocapacitance behavior was observed in the case of 6 mol·L^-1 KOH. It was found that mesoporous MnO2 performed stable reversible electrochemical behavior with capacitance of 220 F·g^-1 in a potential range of -0.1-0.55 V vs. Hg/HgO in alkaline solution, demonstrating that it is a promising novel electrode material for the fabrication of electrochemical capacitors.

关键词： mesoporous material MnO2 electrochemical capacitor

Acid-base cooperativity of heterogeneous catalyst containing acidic framework and sterically hindered base for aldol condensation

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Chinese Chemical Letters 2009年第9期20卷 1051-1054页

作者： Hua Li Shu Tao Xu Xiao Bing Lu Wei Ping Zhang State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

A bifunctional heterogeneous catalyst containing two mutually incompatible acidic and basic sites, which exhibits cooperative catalytic behavior in the aldol condensation of acetone and various aldehydes, was synthesized by postgrafting of 1,5,7- triazabicyclo[4.4.0] dec-5-ene （TBD, a sterically hindered organic base） onto AI-MCM-41 molecular sieve. 2009 Xiao Bing Lu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Bifunctional catalyst Acid-base cooperative catalysis mesoporous material Aldol reaction

Preparation and Visible-light Photocatalytic Activity of mesoporous H_3PW_(12)O_(40)/TiO_2 Composite

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Chemical Research in Chinese Universities 2009年第6期25卷 781-785页

作者： KANG Wan-li LI Jin-huan HUANG Jian-bin YU Xiao-dan GUO Yi-hang State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China Key Laboratory for Enhanced Oil Recovery Ministry of Education Daqing Petroleum Institute Daqing 163318 P. R. China School of Chemistry Northeast Normal University Changchun 130024 P. R. China

Wormhole-like mesostructured H3PW12O40/TiO2 composite catalyst was prepared by the combination of sol-gel chemistry and solvothermal treatment technique in the presence of a triblock copolymer surfactant. Results of Raman spectra, XRD, BJH pore distribution and TEM image indicate that the composite possess a three- dimensionally interconnected pore mesostructure with a high porosity and large pore size. Keggin units were homogeneously dispersed throughout the composite. This composite can catalyze the photodegradation of crystal violet （CV） under visible-light. The photocatalytic activity is much higher than that of pure TiO2 or H3PW12O40/TiO2 composite prepared in the absence of the surfactant.

关键词： Nanostructure mesoporous material Photocatalysis