Study On Removal Methods Of Heavy Metal Pollutants In Automobile Exhaust

With the rapid development of social economy,people's living standard has been improved.With the continuous increase in the number of cars,to bring convenience to life at the same time,automobile exhaust pollution is also more serious.In the process of automobile exhaust emission,the harm of heavy metal pollutants to air,water and soil can not be ignored.In this paper,the contents of 13 kinds of heavy metals in 92#,95# gasoline and 0# diesel exhaust from PetroChina and Sinopec were analyzed and the removal methods were studied.Inductively coupled plasma mass spectrometry(ICP-MS)was used for the determination of 13 heavy metals in automobile exhaust.The average recovery rate of 83.2~110.2%,the relative standard deviation is 1.1~3.8%,the detection limit range of 1.3~5.6,and completed the standard curve matching matrix,the correlation coefficient R2 of 13 kinds of heavy metals of 0.9992~0.9999,showed a good linear relationship.The cordierite honeycomb ceramic was used as the carrier,and the different concentrations of graphene and carbon nanotubes were coated respectively.Under the optimized conditions,the optimum concentration of graphene was 0.5%,and the optimum concentration of carbon nanotubes was about 0.35%.The results show that the adsorption rate of 0.5% graphene is higher than that of the 0.35% carbon nanotubes by about 15%.Graphene is a good mesoporous material,which can be used to remove heavy metal pollutants in automobile exhaust.L-cysteine is a common protein thiol,combined with hydroxyl of graphene and carbon nanotubes to form stable complexes,between graphene and carbon nanotubes were coated with different concentrations of cysteine,removal of heavy metal pollutants in automobile exhaust,after the optimization,the best concentration of cysteine was 0.2% conclusion.The adsorption rate of 0.5% graphene was higher than that of the carbon nanotubes after coating by 25%.The results showed that the adsorption rate of graphene was higher than that of 0.35%.Good adsorption performance.