Experimental Study On The Removal Of Formaldehyde

It becomes necessary to remove formaldehyde by increasing the formaldehydedegradation rate efficiently and conveniently to achieve sustainable development. In thispaper, the orthogonal experimental was used to analyze degradation of formaldehyde bychlorine dioxide. The concentration of chlorine dioxide and formaldehyde, reaction time andreaction temperature was set as the experimental factors. Analyze its impact on thedegradation of formaldehyde to get the best conditions for the degradation of formaldehyde,analyze the impact of degradation of formaldehyde by chlorine dioxide and degradation effectof low concentrations of formaldehyde by Chlorine dioxide through single factor experiments.Using the same experimental apparatus, set the loading of titanium dioxide, the temperatureand humidity as the factors, in this experiment, the relationship between reaction time andconcentration of formaldehyde was analyzed, and the effect of low concentrations offormaldehyde degradation was analyzed. The results show as following.(1) In the study of chlorine dioxide removing formaldehyde, the orthogonal experimentshows the optimal conditions is: concentration of chlorine dioxide15mg/m3,concentration offormaldehyde2mg/m3, the temperature25℃and the reaction time40min. Under the bestcondition, the degradation rate was60%when the concentration of chlorine dioxide was12.5mg/m3. Study shows that when concentration of formaldehyde was0.5mg/m3, thereaction time was40min, the temperature was25℃, and the concentration of Chlorinedioxide was5.0mg/m3, degradation rate of formaldehyde reached the highest84.6%, andconcentration of formaldehyde decreased to0.077mg/m3.(2) In the study of Nano-titanium dioxide photocatalytic coating and research on itsdegradation to formaldehyde,the single factor experiment shows the optimal conditions is:loading amount of photocatalytic coating of titanium dioxide was5g, at room temperatureabout25℃and humidity50%, formaldehyde degradation rate could reach93%after120minunder UV light irradiation conditions, and significantly better than the degradation effect of formaldehyde using commercially available P25nano-titanium dioxide.The reaction of0.5mg/m3formaldehyde with5g self-made titanium dioxide was studied. After210min, theconcentration of formaldehyde was the lowest0.062mg/m3，and the degradation rate was87.6%.