Impact of greenhouse gas CO_(2) on the heterogeneous reaction of SO_(2) on alpha-Al_(2)O_(3)  

作　　者：Yangyang Liu Tao Wang Xiaozhong Fang Yue Deng Hanyun Cheng Hongbo Fu Liwu Zhang 

机构地区：[1]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention,Department of Environmental Science and Engineering,Fudan University,Shanghai 200433 China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092 China

出　　处：《Chinese Chemical Letters》2020年第10期2712-2716,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21976030 and21677037);Ministry of Science and Technology of China(Nos.2016YFE0112200 and 2016YFC0202700);the Natural Science Foundation of Shanghai(Nos.19ZR1471200 and 17ZR1440200)。

摘　　要：The heterogeneous reaction of SO_(2) on mineral dust surfaces is generally considered as an important chemical pathway for secondary sulfate formation in the troposphere.To this day,there are no reported studies that assess the impact of atmospheric CO_(2) in sulfate production on mineral dust surfaces.In this work,we investigate the impact of CO_(2) on SO_(2) uptake on dust proxy aluminum oxide particles using a diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS).CO_(2) is demonstrated to suppress the heterogeneous oxidation of SO_(2) on alpha-Al2 O_(3).Compared to that measured in the CO_(2)-free case,the uptake coefficient is decreased by nearly 57%when Al_(2)O_(3) particles are exposed to the gas flow with atmospheric CO_(2) at a relative humidity(RH)of 25%.It is also found that there is a balance between the yield of active moiety-OH provided by AI(OH)3(CO)(OH)2 clusters and the loss of basic hydroxyl group on aluminum oxide surfaces blocked by CO_(2)-derived(bi)carbonate species.This work,for the first time,reveals a negative effect of atmospheric CO_(2) on the sulfate formation,which potentially decreases solarradiation scattering and further exacerbates global warming.

关 键 词：Atmospheric CO_(2) SULFATE Alpha-Al_(2)O_(3) Mineral dust Heterogeneous reaction 

分 类 号：TQ133.1[化学工程—无机化工] X701[环境科学与工程—环境工程]