Particulate matter capturing over manganese dioxides with different crystal structures  

作　　者：Rui Liu Huan-Huan Yang Hao Zhou Xianliang Yi Yang Liu 

机构地区：[1]Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education),School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China

出　　处：《Journal of Environmental Sciences》2023年第5期667-677,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21806016);the Fundamental Research Funds for the Central Universities(No.DUT22JC15).

摘　　要：Particulate matter(PM)is the main contributor to air pollution,and filtration has been reported to be promising for PM capturing.Considering the complexity of polluted air(volatile organic compounds(VOCs)and ozone are likely concomitant with PM particles)and in view of the versatility of MnO_(2) for the degradation of VOCs and ozone,the feasibility of MnO_(2) materials as PM filteringmediawas investigated in this study,and the effect of crystal structure on PM filtration was clarified.Compared with the layeredδ-MnO_(2),the MnO_(2) with tunnel structure(including 1×2-,2×2-and 3×3-MnO_(2))exhibited greatly enhanced PM removal efficiencies,and particularly,the 3×3-MnO_(2) possessed not only significant activity for adsorbing PM particles but also high utilization efficiency of the active surface.Physicochemical properties of the adsorbents were studied by XRD,ATR,isothermal N_(2) adsorption,SEM and(HR)TEM.The correlation between pore characteristics and particle elimination activity demonstrates that the most developed mesoporous structure of the 3×3-MnO_(2) sample played an important role in strengthening the PM adsorption capability.Further comparison of the surface properties of the fresh and spent samples reveals that with respective to the occasion ofδ-MnO_(2),the structure of 3×3-MnO_(2) was robust enough to resist collapse after PM capturing and the great accommodation of the inorganic and organic PM substances in the voluminous pores induced strong affinity between PM particles and 3×3-MnO_(2).Thereby,a higher particle filtration ability was retained.

关 键 词：Particulate matter filtration Manganese oxides Crystal structure Pore structure 

分 类 号：X513[环境科学与工程—环境工程] TQ137.12[化学工程—无机化工]