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Research on the Correlation for Photocatalytic Degradation of Indoor Volatile Organic Compounds

Author: TangFeng
Tutor: YangXuDong
School: Tsinghua University
Course: Civil Engineering
Keywords: Indoor Air Quality Volatile organic compounds (VOCs) Photocatalytic Multi-component
CLC: TU834
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 0
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Abstract


Photocatalytic purifier has been put into the market, but its mechanism remains to be done and the actual performance system research. First, is the activity of the catalyst, it is directly related to the actual effect, and the life of the purifier VOCs degradable. Photocatalytic kinetic model can not reflect this. Second is a multicomponent VOCs. Indoor air environment that we live in the mixed state of a variety of VOCs, common and great harm to the human body and many dozens VOCs. It is necessary to study the actual degradation effect of multi-component VOCs. However, many researchers tend to see only the multicomponent competitive adsorption, while ignoring other aspects of internal relations. This intrinsic link, including the target VOC respectively in a single, multi-component degradation effect contact the including different VOCs degradation characteristics of the link between the correlation. In response to these problems, the paper benzene, toluene, ethylbenzene, p-xylene, o-xylene, 2 - butanone, n-octane were tetrachloroethane common indoor VOCs target depth study, the main results are as follows LH model is: (1) pointed out the shortcomings, and in describing the degradation of the high concentration region VOCs from catalyst deactivation angles proposed a low, high concentration region are applied in the form of a simple passivation model. Meanwhile, the passive region, curbed concentration, maximum reaction rate, the maximum light intensity, the concept of maximum light utilization photocatalytic purifier can be used to guide the optimization of the design and selection; (2) systematic analysis of the multi-group mutual influence of the stars of VOCs the passivation model with the impact rate (the passivation item with the ratio of the linear term) η = 0.2 as the determination of multi-component interaction indicators can be ignored, and this has been verified in the experiments. However, the the target VOC linear term in the single-and multi-component reaction still equal. Accordingly, it is possible to use multicomponent experimental results to predict the corresponding single component degradation effect at low concentrations (e.g., less than 0.5ppm), thereby greatly reducing the amount of test experiments; (3) Research VOCs photocatalytic degradation The correlation characteristics found similar VOCs apparent reaction rate constant k_a and associated items known physical parameters (VOC components) is proportional to. As long as the test the one of the VOC's k_a value, you can predict similar the other VOCs k_a value. Without like the VOCs being only between the adsorption bond the same type, or a similar class to find the correlation, such as aromatics and olefins. Secondly, under certain conditions, the calculations of k_a convective the transfer coefficient h_m accuracy impact significantly by changing the UV light intensity, with the help of the relational method to accurately measure the h_m.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Ventilation, dust,air purification,dehumidification
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