The Experimental Research On Degradation Of Benzene Pollutant In Indoor By Nanometer TiO₂ Photochemical Catalysis United With Non-thermal Plasma

Indoor air quality has important influence on people's life and work. As benzene is one of the main indoor airborne pollutants and of carcinogenic type, excessive benzene concentration would seriously affect residents'health, it's very necessary to do research on indoor benzene purification technologies.At present, the nanometer TiO2 photochemical catalysis technology and the non- thermal plasma purification technology are two new burgeoning methods, regarding their respective advantages and deficiencies, if combined together, it will become one of the prospect purification technologies for indoor airborne pollutant. From using theoretical analysis method combined with experimental testing, degradation of indoor H6C6 by the union of nanometer TiO2 -non-thermal plasma technologies was studied. This paper used environmental experiment cabin to simulate the indoor air pollutant by H6C6, loaded the nanometer TiO2 catalysis on glass by sol -gelatin, and used the EYE-3 plasma equipment as the non-thermal plasma origin. Using benzene as the degradation target to carry on the sole photochemical catalysis experiment, the sole plasma degradation experiment and the non-thermal plasma catalysis degradation experiment for comparison, and the experimental degradation process was analyzed; After that, through experiments and function analysis of the nanometer TiO2 catalyst in non-thermal plasma catalysis degradation experiment was analyzed, as well as the influence of the calcined temperature in the nanometer TiO2 catalysis preparation process to the catalyst performance, and inspection of the influence of the H6C6 initial concentration, the temperature, the humidity, the electric-field intensity on the nanometer TiO2 united with non-thermal plasma degradation reaction.The experimental result indicated that, the sole photochemical catalysis technology and the sole plasma technology have the certain degeneration function on H6C6, the union of the nanometer TiO2 photochemical catalysis technology and the non- thermal plasma purification technology performed best to remove indoor H6C6 , The degradation rate reaches 94.9%, which surpasses the performance of the sole photochemical catalysis technology and the sole non- thermal plasma technology. During the research on the catalyst function experiment, when the calcined temperature in the catalyst preparation process is 450℃, the crystal is anatase, the particle size scope of the TiO2 crystal is about 30nm, the degrading effect is the best ; When the temperature is 600℃, the crystal is mixture of anatase and rutile, the degrading effect is next; When temperature is 700℃, the particle size is about 100nm, the crystal is entirely rutile,the degrading the effect is the worst. When the initial concentration scope is from 0.534 mg/m3to 6.6 mg/m3, as the H6C6 initial density rises , the degrading rate reduces; reaction temperature rising is beneficial to the reaction degradation rate's enhancement; Within the scope of experimental humidity, the steam performed against the reaction process, when steam content is 9.0g/kg, the degrading rate is 70.3%,the degrading rate gradually reduces along with the increase of humidity; In the electric-field intensity experiment, when the reaction degradation rate is 4kv/cm, the H6C6 degradation rate is 43.7%. When 6kv/cm, the H6C6 degeneration rate is 61.9%,. When 8kv/cm, the degrading rate is 71.3%, the degrading rate of H6C6 elevates along with increase of the electric-field intensity. It can be concluded that it can effectively degrade the indoor H6C6 by using the association technology of the nanometer TiO2 photochemical catalysis and the non- thermal plasma purification.