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Your search keyword '"Lei, Yong"' showing total 30 results
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30 results on '"Lei, Yong"'

1. Preparation and Photoactivity of Titanium Dioxide-Coated Carbon Felt Using Supercritical Carbon Dioxide

Author

You Ji Li, Wei Chen, Lei Yong Li, and Ming Yuan Ma

Subjects
Supercritical carbon dioxide, Materials science, Scanning electron microscope, Inorganic chemistry, General Engineering, chemistry.chemical_element, Supercritical fluid, Congo red, chemistry.chemical_compound, chemistry, Titanium dioxide, Photocatalysis, Carbon, Nuclear chemistry, BET theory
Abstract

TiO2–coated carbon felt (TCF) was prepared via a supercritical treatment with titanium tetraisopropoxide (TTIP) and different carbon felt as a precursor and support, respectively. The TCF samples with different carbon felts were characterized by X-ray diffraction, scanning electron microscopy, UV-VIS spectroscopy, particle size analyzer and BET surface area. The photocatalytic activities of samples were evaluated by congo red (CR) degradation. The result reveals that all the three samples show much higher photoactivity than the commercial P25. The activity order of the three samples is TCF1< TCF2 < TCF3. The photoactivity is strongly dependent on the surface area and the crystallite size: the larger the surface area and the smaller the crystallites, the higher the efficacy of photocatalytic degradation. The optimal photocatalytic condition is a CR concentration of 45 mg/l at pH 7.

Published
2010

2. Photocatalytic Degradation of Methylene Blue Using Immobilized Nanoparticles of TiO2 Supported by SBA-15 Surface

Author

Ming Yuan Ma, You Ji Li, Wei Chen, and Lei Yong Li

Subjects
Nanocomposite, Materials science, General Engineering, Nanoparticle, Supercritical fluid, chemistry.chemical_compound, chemistry, Chemical engineering, Photocatalysis, Degradation (geology), Composite material, Photocatalytic degradation, Spectroscopy, Methylene blue
Abstract

TiO2-SBA-15 surface (TSS) composites were prepared by the supercritical pretreatment and then sol-gel process with using paraffin used as a clogging agent. The as-grown materials were characterized by using X-ray diffraction, UV-VIS spectroscopy and nitrogen absorption. The photocatalytic activities of TSS were evaluated by quantifying the degradation of methylene blue solution under UV light. Compared with TiO2-SBA-15 (TS) composites prepared only by the sol–gel method, TSS composites remain in mesostructure with high surface areas due to clogging effect of paraffin on SBA-15 cavity. Additionally, the small crystalline size of TiO2 in TSS is attributed to the fact that silica support baffles the agglomeration ofTiO2 nanoparticles. In comparison of TS composites and pure TiO2, higher photocatalytic activity of TSS is obtained and mainly attributed to larger surface areas and greater band-gap energy.

Published
2010

29. The Preparation of Higher Ordered Poly (3-Hexylthiophene) by Oxidative Method

Author

Wang, Wen, Liang, Lu Ying, Wang, Wei, Zheng, He Min, Xu, Zong Xiong, Lei, Yong Kun, Lin, Hong Yu, and Ling, Qi Dan

Abstract

Poly (3-hexylthiophene) (P3HT) was synthesized by a modified simple FeCl3 oxidative polymerization. The use of mixed solvents provides a low-cost and effective method to prepare the higher ordered P3HT. The SEM result shows that the assembling of P3HT tends to produce nanowires with 1, 4-dioxane as the poor solvent. The XRD result shows that the formation of P3HT nanowires can enhance the order and regularity of the polymer. The conformation transformations of P3HT chains were analyzed by ultraviolet visible light absorption spectrum. The results show that the higher ordered P3HT was obtained. The higher ordered P3HT can improve the utilization rate of the sunlight when applied in solar cells.

Published
2014
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30. Photocatalytic Degradation of Methylene Blue Using Immobilized Nanoparticles of TiO2 Supported by SBA-15 Surface

Author

Li, You Ji, Chen, Wei, Li, Lei Yong, and Ma, Ming Yuan

Abstract

TiO2-SBA-15 surface (TSS) composites were prepared by the supercritical pretreatment and then sol-gel process with using paraffin used as a clogging agent. The as-grown materials were characterized by using X-ray diffraction, UV-VIS spectroscopy and nitrogen absorption. The photocatalytic activities of TSS were evaluated by quantifying the degradation of methylene blue solution under UV light. Compared with TiO2-SBA-15 (TS) composites prepared only by the sol–gel method, TSS composites remain in mesostructure with high surface areas due to clogging effect of paraffin on SBA-15 cavity. Additionally, the small crystalline size of TiO2 in TSS is attributed to the fact that silica support baffles the agglomeration ofTiO2 nanoparticles. In comparison of TS composites and pure TiO2, higher photocatalytic activity of TSS is obtained and mainly attributed to larger surface areas and greater band-gap energy.

Published
2010
Full Text
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