Study on TiO2/Diatomite/Sphagnum Composite Photocatalytic Humidity-controlling Materials
HU Mingyu1, ZHOU Xia1, LI Ye1, TAN Yuqiu2
1 Key Laboratory for Ultra-low Energy Buildings of Jiangxi Province, School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China 2 School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
Abstract: Excellent indoor air environment is of great significance to ensure the health and comfort of residents. The composite of diatomite and nano-TiO2 may produce synergistic effect, which is expected to degrade formaldehyde and control humidity at the same time. The effect of TiO2/diatomite/sphagnum on the degradation of formaldehyde and the control of temperature and humidity was studied by chamber experiment. It shows that the photocatalytic humidity-controlling materials can effectively degrade formaldehyde and control temperature and humidity. Based on XRD, SEM, UV-visible light absorbance and FTIR analysis, the degradation mechanism of formaldehyde and the mechanism of temperature and humidity regulation of TiO2/diatomite/sphagnum composite were studied. The researches show that under natural light, TG-1∶7 material can control the formaldehyde concentration in the small chamber within 0.06 mg/m3, and the formaldehyde reduction rate reaches 89.1%; TG-1∶7 mate-rial can effectively control the relative humidity in the small chamber at 58% RH, and can adjust the indoor temperature to a certain extent. The combination of TiO2 and diatomite humidity-controlling material can improve the separation of photo-generated electrons (e-) and photo-generated holes (h+) in the semiconductor, delay the rate of recombination of h+ and e-, and narrow the band gap. A large number of silicon hydroxyl groups on the surface of the photocatalytic humidity-controlling materials can generate more Bronsted acid site, which can effectively capture h+ and generate hydroxyl radicals (·OH), which enhances the photocatalytic activity of TiO2.
胡明玉, 周侠, 李晔, 谭煜秋. TiO2/硅藻土/泥炭藓复合光催化调湿材料研究[J]. 材料导报, 2021, 35(10): 10036-10041.
HU Mingyu, ZHOU Xia, LI Ye, TAN Yuqiu. Study on TiO2/Diatomite/Sphagnum Composite Photocatalytic Humidity-controlling Materials. Materials Reports, 2021, 35(10): 10036-10041.
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2021, Vol. 35 
