锰离子催化臭氧氧化气相丁醛

The degradation of gas-phase butyraldehyde by Mn2+ catalytic ozonation

摘要:

为研究餐厨油烟中挥发性有机物（VOCs）的去除方法,以丁醛为目标污染物,考察了锰离子催化臭氧氧化对丁醛的降解效果,并考察了pH、催化剂浓度、\[O₃\]/\[丁醛\]浓度比、温度、丁醛的初始浓度等因素对Mn2+催化臭氧氧化丁醛效果的影响.结果表明：Mn2+的加入可以显著提高丁醛的降解率,降解效率随\[O₃\]/\[丁醛\]浓度比升高和丁醛浓度的降低而增大,随Mn²浓度和温度的增大先升高后降低,分别在浓度为1 mmol/L和温度为30 ℃时降解效果最好；存在最优pH,即pH=5时降解效果最好；在催化剂浓度为1 mmol/L、pH=5、丁醛初始浓度为50 mL/m³、\[O₃\]/\[丁醛\]=0.2、温度为室温的条件下,丁醛的降解率可达94.67%,矿化率为91.8%.

Abstract:

To study the VOCs removal in cooking oil fume, the degradation of butyraldehyde as the target pollutant by Mn2+ catalytic ozonation was studied, the reaction conditions that affect the removal efficiency of butyraldehyde including the presence or absence of Mn2+, pH, catalyst concentration, the initial concentration of butyraldehyde, \[O₃\]/\[butyraldehyde\] concentration ratio, temperature were investigated . The results showed that: the addition of Mn2+ can significantly improve the removal efficiency of butyraldehyde, and the removal efficiency improved with the decrease of the concentration of butyraldehyde and the increase of \[O₃\]/\[butyraldehyde\] concentration ratio. The degradation rate firstly increased then decreased with the increase of the concentration of Mn2+ and temperature, reaching the optimization when at 1 mmol/L and 30 ℃, respectively. The optimal pH existed, which is 5.When catalyst concentration was 1 mmol/L, pH =5,the initial concentration of the butyraldehyde 200 mL/m³,\[O₃\]/\[butyraldehyde\]= 0.2, under the room temperature, the removal rate of butyraldehyde is 94.67%, mineralization is 91.8%.