Preparation of humidity control and formaldehyde degradable indoor coating

Abstract

With the development of science and technology people spend more than 80% of their time indoors which has attracted much attention toward the indoor air purification and humidity control ability According to statistics formaldehyde (HCHO) is the most common indoor air pollutant and prolonged exposure to low-dose formaldehyde may cause many adverse health effects In addition in the island-type climate of Taiwan the average annual humidity is up to more than 75% which leads to problems such as the growth of mold and respiratory diseases Therefore in order to pursue a better indoor quality of life the control of relative humidity and the degradation of formaldehyde are regarded as a major consideration This research is based on the basic concept of waste recycling i e mainly using two kinds of inorganic wastes The enhancement silica fume (ESF) is mainly a process waste of traditional industries which has a mesopore structure; and the other is spent fluid catalytic cracking catalysts (sFCCC) which has a high specific surface area and is mainly composed of Y-type zeolite structure In this study waste is used as a moisture adsorption-desorption carrier and the prepared photocatalyst is used as a functional material for air purification The different ratios of filler functional materials binders are used to prepare a coating The results of the study show that the humidity control capacity of the best sample reaches 29 20 g/m2 (JIS-1470-1) while the photodegradation efficiency of formaldehyde under visible light is 73 40% both of which were better than commercial coatings This shows that the multifunctional coatings in this study can offer a possibility to create a more comfortable and healthy environmental quality to the living space More importantly valorization of the inorganic wastes into multifunctional coatings which is in line with the concept of circular economy

Date of Award	2020
Original language	English
Supervisor	Shou-Heng Liu (Supervisor)