Uniform core-shell structured magnetic mesoporous TiO (FeO@SiO@mTiO) nanospheres were fabricated via a kinetically controlled Stöber method. A silica interlayer with a thickness of ∼25 nm was introduced as a passivation barrier to prevent photodissociation, as well as increase the thermal stability of the core-shell materials. After crystallizing at 600 °C under nitrogen, the resultant nanospheres (FeO@SiO@mTiO-600) possessed well-defined core-shell structures with a high magnetic susceptibility (∼17.0 emu g) and exhibited uniform mesopores (∼5.2 nm), large BET surface area (∼216 m g) and large pore volume (∼0.20 cm g). More importantly, the magnetic mesoporous TiO was demonstrated for the first time as a highly efficient and stable sonocatalyst for the degradation of bisphenol-A. The pseudo first-order-reaction constant of the magnetic mesoporous TiO was measured to be 0.164 min, which is 1.49 and 2.27 times higher than that of P25 and ultrasound alone, respectively. The remarkable performance is attributed to the fast mass diffusion, large adsorption rate and enhanced hydroxyl-radical-production rate of the nanospheres. More importantly, the catalyst can be easily recycled within 2 minutes using an external magnetic field, and a constant catalytic activity is retained even after eight cycles. This study paves a promising way for the design and synthesis of magnetically separable sonocatalysts for the degradation of organic pollutants, which is of significant importance for practical applications from both environmental and industrial points of view. This journal is
Qiu Pengpeng 李炜 Thokchom Binota Park Beomguk Cui Mingcan 赵东元 Khim Jee Hyeong
Journal of Materials Chemistry A
2015
Over the past decade, high-quality lanthanide doped upconverting nanoparticles (UCNPs) have been successfully synthesized with the rapid development of nanotechnology. Due to the unique electron configuration of lanthanide ions, there are rich energy level structures in the near-infrared, visible and ultraviolet spectral range. However, for UCNPs, only a limited number of efficient upconversion excitation and emission have been generated due to the limited number of sensitizer (Yb) and activator (Tm, Er, and Ho) ions, and the application is mainly focused on the bio-imaging by using the upconversion luminescence of UCNPs. Recently, more and more researchers have started to focus on tuning of upconversion optical properties and developing of multi-functional UCNPs by using the combination of sub-lattice mediated energy migration, core@shell structural engineering and UCNPs based nanocomposites which greatly expands the range of applications for lanthanide-doped UCNPs. Therefore, a "nanolab" can be created on UCNPs, where the property modulation can be realized via the designed host-dopants combinations, core@shell nanostructure, energy exchange with "alien species" (organic dyes, quantum dots, etc.), and so on. In this paper, we provide a comprehensive survey of the latest advances made in developing lanthanide-doped UCNPs, which include excitation and emission energy levels guided designing of the UCNP nanostructure, the synthesis techniques to fabricate the nanostructure with optimum energy level structure and optical properties, the fabrication of UCNPs-based nanocomposites to extend the applications by introducing the additional functional components, or integrating the functional moiety into one nanocomposite. This journal is
Xiaomin Li 张凡 赵东元
Chemical Society Reviews
2015
Heterogeneous catalysts which show high catalytic performance, structural stability, and low toxicity, are greatly required to efficiently degenerate organic pollutants in waste water in advanced oxidation processes (AOPs). In this paper, a mesoporous Cu-Mn/TiO
Hongyang Min Xianqiang Ran 范建伟 Sun Yu 杨建平 Wei Teng 张伟贤 李光明 赵东元
Journal of Materials Chemistry A
2015
(Figure Presented). Dichloro(η6-p-cymene) (1-butyl-3-cyclohexyl-imidazolin-2-ylidene) ruthenium(II) (RuL) was synthesized and confirmed. Five heterogeneous catalysts with similar ruthenium cores were prepared by chemical immobilization method using various silica-based supports, including mesoporous silica SBA-15 of different pore sizes (Ru/Si-9, Ru/Si-8, and Ru/Si-7), nonporous silica particles (Ru/SiO
Cao Hui Zhu Xiao-Han Wang Dong Zhenkun Sun 邓勇辉 侯秀峰 赵东元
ACS Catalysis
2015
Transition metal oxides are regarded as promising anode materials for lithium-ion batteries because of their high theoretical capacities compared with commercial graphite. Unfortunately, the implementation of such novel anodes is hampered by their large volume changes during the Li+ insertion and extraction process and their low electric conductivities. Herein, we report a specifically designed anode architecture to overcome such problems, that is, mesoporous peapod-like Co
顾栋 李炜 Fei Wang Bongard Hans Spliethoff Bernd Schmidt Wolfgang Weidenthaler Claudia 夏永姚 赵东元 Ferdi Schüth
Angewandte Chemie - International Edition
2015
The unique zeolite-based core-shell structures showed excellent performance in the coal chemical, petrochemical and fine chemical industries. The synthesis and applications of core-shell structured zeolite composite materials were systematically reviewed. Three core-shell structures for the zeolite composite materials were involved, including zeolite-based crystal as cores, zeolite-based materials as the shells and zeolites@zeolites core-shell structures. The hollow zeolite crystals and the magnetic@zeolites core-shell composites were also mentioned as two kinds of distinguished core-shell structured zeolite composites. The development and application prospects of zeolite-based core-shell structure composite materials were also discussed.
Xue Zhaoteng Tang Xueting Wang Wenxing 赵东元
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section)
2015
Abstract Transition metal oxides are regarded as promising anode materials for lithium-ion batteries because of their high theoretical capacities compared with commercial graphite. Unfortunately, the implementation of such novel anodes is hampered by their large volume changes during the Li+ insertion and extraction process and their low electric conductivities. Herein, we report a specifically designed anode architecture to overcome such problems, that is, mesoporous peapod-like Co
顾栋 李炜 Fei Wang Bongard Hans Spliethoff Bernd Schmidt Wolfgang Weidenthaler Claudia 夏永姚 赵东元 Ferdi Schüth
Angewandte Chemie - International Edition
2015
周磊 Rui Wang Chi Yao Xiaomin Li Wang Chengli 张晓燕 Xu Congjian Zeng Aijun 赵东元 张凡
Nature Communications
2015
This work demonstrates an improved (NH
Zou Chenglong Sha Guanyu 黄曜 牛国兴 赵东元
Cuihua Xuebao/Chinese Journal of Catalysis
2015
The synthesis of well-defined and complex hollow structures via a simple method is still a major challenge. In this work, a facile and controllable "multi-interface transformation" approach for preparation of monodisperse multi-shelled periodic mesoporous organosilica (PMO) hollow spheres has been established by a one-step hydrothermal treatment of successively grown organosilica particles. The multi-shelled PMO hollow spheres have inorganic-organic hybrid frameworks, controllable number (1-4) of shells, high surface area (∼805 m2/g), accessible ordered mesochannels (∼3.2 nm), large pore volume (1.0 cm3/g), and uniform and tunable diameter (300-550 nm), chamber size (4-54 nm), and shell thickness (10-30 nm). In addition, various organic groups (alkyl, aromatic, and heteroelement fragments) are successfully incorporated into the multi-shelled PMO hollow spheres by successively adding different bridged organosilica precursors. Notably, the distribution of different kinds of organic groups in the multi-shelled PMO hollow spheres can be precisely controlled, showing great potential for future applications. We propose that the formation of the multi-shelled PMO hollow structures is ascribed to the creation of multiple highly cross-linked organosilica interfaces, providing a new and interesting fundamental principle for PMO materials. Due to their unique structure and frameworks, triple-shelled ethane-bridged PMO hollow spheres were successfully loaded with an anti-cancer drug doxorubicin and perfluoropentane gas, which present excellent effects in the killing of cancer cells and ultrasound imaging. It is expected that the multi-interface transformation strategy provides a simple, controllable, versatile, and template-free method for preparation of various multifunctional PMOs for different applications. (Figure Presented).
Zhaogang Teng Xiaodan Su Yuanyi Zheng Zhang Junjie Ying Liu 王守巨 Wu Jiang 陈国韬 Wang Jiandong 赵东元 Guangming Lu
Journal of the American Chemical Society
2015