Study On Purifying Indoor Sulfur Dioxide With Wool Fiber Modified By Nano-TiO₂

Since the accident of Belgium Maas valley air pollution on December1930, amongthe five most serious air pollution accident, four of them resulted from the excess of sulfurdioxide in the air. The quality deterioration of the indoor air has seriously affected the lifeand health of human. In order to prevent the air pollution from sulfur dioxide, as well asthe probability of human poisoning, this paper developed a way, which combined thenano-TiO₂and the wool fiber to filter the indoor sulfur dioxide.The article summarized the nano-TiO₂pholocatalyst and multifunctional materialdevelopment process of the applications in the environmental protection. The fiber’sadsorption characteristics was analyzed by the organizational structure of the wool:adsorption Isotherm, absorption of sulfur dioxide physical and chemical adsorptionmechanism, physical adsorption of the theory of volume filling of micropores, etc.; At lastalso analyzed the catalytic mechanism of the degradation of sulfur dioxide process bynano-TiO₂photocatalytic in details, nano-TiO₂pholocatalyst deactivation, photocatalyticaffecting factorsThis article compares the advantages and disadvantages of the manufacture methodsof Wool Fiber Modified by Nano-TiO₂, this experiment used the method of two leachingand two stains to prepare the wool fiber modified by nano-TiO₂, then did the static stateand dynamic state experimental test on those Wool Fiber.（1） Static experiment: The degradation rate of sulfur dioxide of "The original sample1" in the static state experiment box was9%by experimental measurement, while it is10%for the " the modified sample1". With the UV light, the filtration efficiency of sulfurdioxide were53%,59%,60%,65%,71%for "The modified sample1-5", correspondingly.Static state experiment results prove: Without the UV light, the degradation rates of sulfurdioxide of two samples （original and modified） are almost the same, however, with the UVlight, this rate increased geometrically for the modified samples.（2） The dynamic state experiment: The drag of " the modified sample1" increased by10.02%. Without UV light and wind speed of0.2m/s, the degradation rates of sulfurdioxide of "the original sample" were10%and13%;before and after the modification,respectively. With the UV light and wind speed of0.2m/s, the degradation rates of "themodified samples1-5" were28%,32%,35%,40%and42%. Those rates will be32%,34%,37%,41%,43%at their favorable wind speed. At22℃-28℃, this rate increasedwith the decreasing of the temperature. Dynamic state experiment results prove: withoutUV light, the rates did not change much before and after the modification. However, with the UV light, it was improved obviously, and was affected by the external factors, i.e. windspeed and temperature et al. Each sample has the corresponding best wind speed, within acertain range, the higher the temperature, the lower the degradation rate of sulfur dioxide.