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Exploration Research on Synthesis and Coupling Properties of Titanium Dioxide/Porous Carbon

Author: HuangDaCheng
Tutor: ZhangZuo；LiuQingLei
School: Shanghai Jiaotong University
Course: Materials Science
Keywords: High specific surface area Composite photocatalyst Porous carbon Doped titanium dioxide Photodissociation dynamics
CLC: TB332
Type: PhD thesis
Year: 2012
Downloads: 287
Quote: 0
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Abstract


With the continuous development of the global process of industrialization, increasingly serious environmental pollution, environmental protection and sustainable development of mankind must be considered. Photocatalytic as chemistry, physics, materials and environmental multidisciplinary fusion formed a new cross-disciplinary, but the pollution inexhaustible energy and environmental protection combine to degrade toxic industrial waste, harmful, difficult to break down organic matter, thus demonstrating a broad application prospects and enormous social and economic benefits. Nano-TiO 2 material for its chemical stability, catalytic degradation of organic pollutants, fast response, wide application range, deep oxidation completely, can harness the sun light and air and oxygen molecules in the aqueous phase Advantages and become acclaimed photocatalytic material, especially when high concentrations of organic pollutants or otherwise difficult to degrade, the material shows a more obvious advantages. Generally speaking, nano TiO 2 photocatalysis mainly in liquid - solid phase and gas - solid phase, the presence of catalyst loss and difficult recovery problem, TiO 2 immobilized on the porous carrier is an effective way to solve the above problems, and immobilized in a porous carrier generally have better adsorption performance, can improve the TiO 2 particle surface to facilitate environmental concentrations of TiO 2 catalytic degradation of organic matter. Nano-TiO 2 immobilization studies including carrier selection and immobilization technology. Currently researchers are mainly used for physical vapor deposition, chemical vapor deposition and sol - gel method nano-TiO 2 immobilized on a porous substrate, such as: activated carbon, zeolites, carbon nanotubes, but the These traditional method is easy for a single pore structure resulting coated porous substrate. This work on the methods and immobilized immobilized carrier to make improvements to reduce TiO 2 on the active surface of the porous carbon coating, the other can be controlled morphology of the carbon-doped TiO 2 powder materials. In this paper, we use agricultural waste - water bamboo leaves as raw material by physical activation method and mixed activation hierarchical pore structure were prepared by high surface area activated carbon and activated carbon, followed by using different methods will TiO 2 Materials immobilized to the surface of both carbon and studied the preparation process, TiO 2 load volume, pore size distribution of the composite photocatalyst photocatalytic degradation of organic pollutants such effects and mechanism. Its conclusions are as follows: (1) water bamboo leaf raw material by physical activation of thin air, can be prepared to get graded pore structure of activated carbon. Such activated carbon while retaining good macroporous structure of the plant itself, but through the activation of thin air adsorption activity has produced a large number of nano-pore structure. In the hierarchical pore structure of activated carbon, the large hole hole wall of TiO 2 materials immobilized provide load points, while the nano-pore structure is adsorbed organic liquid phase catalytic system, it enriched in TiO 2 surface to promote organic pollutant molecules and TiO 2 collisions and improve TiO 2 photocatalytic efficiency. (2) in the thin air and K2CO3 as the activator of the activation mixture, water bamboo leaf can be converted into a high specific surface area activated carbon. The obtained activated carbon prepared mainly constituted by the hard carbon. Experimental results show that activation of the mixing process, the air in the O 2 and the synergy between the activation of K2CO3, so that the resulting activated carbon prepared more developed nano-pore structure. Under the optimal process conditions, high surface area can be obtained 2481m2 / g of activated carbon. This is TiO 2 immobilization provides a good carrier. (3) titanium ethyl (TTED) as titanium source, high surface area activated carbon as the carrier, the use of immersion - hydrolysis prepared TiO 2 / activated carbon and N-TiO 2 < / sub> / two kinds of high surface area activated carbon composite photocatalyst. This method can be well preserved while the active surface of the activated carbon, the other through H2O (gas) for TTED hydrolysis, immobilized on activated carbon TiO 2 grain size can be controlled in about 10nm and has a good dispersibility. When TiO 2 and N-TiO 2 in the composite photocatalyst contents were 7.7wt% and 8.3wt% when, TiO 2 / activated carbon and N-TiO 2 / specific surface area of ??the activated carbon were 1483m2 / g and 1321m2 / g. (4) butyl titanate (TTIP) as titanium source, a hierarchical pore structure of activated carbon as a carrier by sol - gel prepared TiO 2 , N-TiO 2 / hierarchical pore structure of activated carbon two kinds of composite photocatalyst. Experiments show: hierarchical pore structure of activated carbon on the one hand an effective suppression of the TiO 2 and N-TiO 2 reunion, fine particles have been nanoscale TiO 2 and N-TiO 2 , the other hierarchical pore structure of activated carbon substrate well to avoid the sol - gel preparation obtained TiO 2 layer on the substrate fully coated, so that the final composite photocatalyst, the retained portion of the matrix hierarchical pore structure. Hierarchical pore structure of activated carbon shows better than commercial immobilized performance. (5) in the sol - gel method resulting TiO 2 / hierarchical pore structure of activated carbon powder, based on the dose of Mg is ignited by combustion synthesis prepared with graded porous plant structure TiC, TiC by grading porous burning in the air, to get C-doped TiO 2 / porous carbon composite photocatalyst, has been controlled form TiC and C-doped TiO 2 / porous carbon composite photocatalyst. And commercial TiC obtained after burning C-doped TiO 2 compared to hierarchical porous structure of the C-doped TiO 2 / porous carbon efficiency of the catalytic degradation of organic matter. (6) Based on the above prepared by the method with different pore structure composite photocatalyst, paper and systematically compared and studied these composite photocatalyst with TiO 2 or N-TiO 2 Catalytic properties of light, and how these photocatalysts for the corresponding organic adsorption kinetics, dynamics from the perspective of the TiO 2 and N-TiO 2 photocatalytic properties and activated carbon adsorption mechanism of synergy between. In the same phase photocatalytic conditions, composite photocatalyst by adsorption increased TiO 2 and N-TiO 2 concentration of organic matter to improve the surrounding composite photocatalyst catalytic efficiency. Composite photocatalyst catalytic performance than the corresponding without immobilized TiO 2 or N-TiO 2 catalytic performance has greatly improved.

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