Removal of formaldehyde from indoor air by passive type air-cleaning materials |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Tokai University, 1117 Hiratsuka, Kanagawa 259-1292, Japan;2. New Business Development Department, Hitachi Chemical Co. Ltd., 48 Wadai, Tsukuba 300-4247, Japan;1. International Doctoral Innovation Center, University of Nottingham Ningbo China, Ningbo, China;2. Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo, China;3. Faculty of Engineering, University of Nottingham, University Park, Nottingham, United Kingdom;4. College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, China;5. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Ningbo China, Ningbo, China;6. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Research Center of Heterogeneous Catalysis and Engineering Science, School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, PR China;1. College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China;2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;3. School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 310058, China;4. Zhejiang Duopu Detection Technology Limited Company, Hangzhou 310030, China;5. Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China |
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| Abstract: | We have developed a board-like air-cleaning material consisting of activated carbon particles and manganese oxides, by which HCHO gas is decomposed into carbon dioxide even at room temperature. In this study, we investigated removal efficiencies of the air-cleaning board in a passive mode using a kinetic approach. First-order removal rate constant, k, corresponding to air change rate was characterized for the board as a function of the ratio of applied board area to space volume, S/V, and was found directly proportional to S/V with a slope of 25 at 25°C. The performance of the board was evaluated in a full-size laboratory with a constant gas generation. The board suppressed the increase of indoor HCHO concentration and the time course fitted to a theoretical curve. Then, field tests of the air-cleaning board were conducted in newly constructed multi-family houses in Japan from May 1998 to January 1999. The board not only reduced indoor HCHO concentration from 0.21 to 0.04 ppm for more than 7 months, but also enhanced the loss of HCHO gas from building materials in apartments. |
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