Research On The Removal Of Formaldehyde From Indoor Air By Plasma And Modified Activated Carbon

Indoor Air Quality has become an important environmental factor that affects people's health. Formaldehyde is a bioplasm poison, and it is potentially carcinogenic. As one of the main indoor airborne contamination, it gets more and more attention in importance of treatment. After investigated the domestic and foreign technologies of removing VOCs from indoor air, the experimental research about destruction of formaldehyde in VOCs with discharge plasma and combine modified activated carbon adsorbing was presented.In the experiment, a dielectric barrier discharge reactor was elected. The removal of formaldehyde depends on two mechanisms: collision between electrons and HCHO molecules and reactions between gas-phase radicals and HCHO molecules. The effects of experimental parameters on the removal efficiency of formaldehyde are investigated. The results show that the removal efficiency of formaldehyde increases with the increase of applied voltage, which exists an ultimate value; and decreases with the increase of gas flow rate and intake concentration. As to the experimental reactor, the optimal voltage value is 3kV. Under the optimized reactive conditions, the removal efficiency can reach 97%.In order to improve the quality of outlet air, an activated carbon adsorbing device was connected to the dielectric barrier discharge reactor, and the activated carbons were modified by NaHSO3 and Na2CO3. The removal effects of formaldehyde and ozone, a main kind of productions of plasma reactor, were investigated in different gas flow rates. Results indicates that, under the united device, the removal efficiency of formaldehyde observably increase, and the climbing trend become more and more obvious with the increase of gas flow rate; In plasma reactor, the concentration of ozone decreases with the increase of gas flow rate, though the adsorbing of the modified activated carbons, the concentration of ozone obviously decreases, and the outlet concentration of ozone keep in a relatively low balanceable level.During the experimental research, the analytical method of formaldehyde had been also discussed; an optimal analytical method was confirmed. When the main reach task was carrying through, we did some work about the tentative preparation of solid polymer electrolyte composites. In the epilogue of the paper, author puts forward the further study direction, and the prospect of the study.