| In this study, combined with theoretical analysis and experimental verificationmethod to determine the best of TiO2photocatalyst methods and analysis of activatedcarbon supported TiO2photocatalyst load effects and load. Sol-gel method and filterpaper template prepared TiO2-I, TiO2-II nano-particles as a photocatalyst, by meansof XRD and SEM, systematic analysis and evaluation of the parameters of TiO2nanoparticles photocatalytic properties; activated carbon fibers as carrier, TiO2-I,TiO2-II nano-particles supported on activated carbon fiber surface, the use of themeans of XRD and SEM observation TiO2/ACF composite photocatalyst surfacemorphology and crystal structure, and by changing the parameters to determineTiO2/ACF prepared in the best condition.The dissertation is about the research of iron/active carbon fiber and titaniumdioxide photocatalysis technique to eliminate formaldehyde under daylight lamp andthe preparation method of the activator. Seeing about the influence of theconcentration of the iron in the activator, the concentration of titanium dioxide, thetemperature to calcine, the diameter of active carbon, and so on. Also, we haveresearched on the dynamics of the activator.(1) Preparation of TiO2-II nanoparticles paper, filter paper template to determinethe optimal experimental conditions and optimum product by changing the amount oftetrabutyl titanate. Experiments show that, when deionized water7.2mL, tetrabutyltitanate of the present experiment, the preferred amount of reagent as8.5mL, i.e. thebest reagent volume ratio C2H5OH: acac: H2O: Ti (OC4H9)4=35.0:3.1:7.2:8.5.(2) To determine the optimal dosage of reagents based on the best way to analyzethe sol-gel method and filter paper template prepared TiO2nanoparticles.Experiments show that, under the same conditions, TiO2-I nanoparticles than theTiO2-II-3nano particle size smaller and more uniform particle distribution. Therefore,the best preparation method of TiO2particles is the sol-gel method.(3) In this study, by changing the amount of catalyst and with the means of XRDand SEM to observe the TiO2and activated carbon fiber effect. The experimentsshow that，the optimal dosage of52.0g of catalyst/L, corresponding to the optimalload for35.9%TiO2load activated carbon fiber load the best, most load.(4) Determine the optimal amount of catalyst on the basis of excessiveimpregnation method, The sol-gel method, TiO2-I can more uniform load in activated carbon fibers, ie, TiO2-I/ACF load better.(5) When the doping of iron was0.03(concentration), TiO2load activated carbonratio0.7, and calcinations’ temperature400-500℃, the catalytic activity was the best.The article analyses the purifying capabilitiesunder the condition of differentinfluencing factors by the experiment of purifying formaldehyde in air conditioningsystem simulated and compares the purifying capabilities of three kinds ofpurification web appliedto air conditioning system，iron/active carbon and titaniumdioxide photo catalysis web and active carbon purification web and titanium dioxidephoto catalysis purification web．The resultshows purificationefficiency of the newpurification technique is15%higher than other two kinds of purificationtechniqueswhen the air speed is1.0m/s or0.1m/s, The difference of cleaningefficiency is less than10%when the airflow is at high or low velocity．And the newpurification technique possesses stronger capability of absorption and decompositionon contaminants and less resistant of airflow and can avoid the producing of newcontaminants and realizes the regeneration of active carbon in the same place andprolongs the life cycle of activecarbon．The experiment shows the new purificationtechnique makes up for the disadvantages of present purifying techniques andcleaning efficiency is enhanced about20%．... |
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