Formation of sulfur oxide groups by SO_(2) and their roles in mercury adsorption on carbon-based materials  

作　　者：Fenghua Shen Shudan He Junyuan Li Cao Liu Kaisong Xiang Hui Liu 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Changsha 410083,China [3]School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

出　　处：《Journal of Environmental Sciences》2022年第9期44-49,共6页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51722407 );the Science and Technology Project of Hunan Province (No. 2019RS3006);the Project of Innovation-driven Plan in Central South University (No. 20180018050001)。

摘　　要：The presence of SO_(2) display significant effect on the mercury(Hg) adsorption ability of carbon-based sorbent. Yet the adsorption and oxidation of SO_(2) on carbon with oxygen group, as well as the roles of different sulfur oxide groups in Hg adsorption have heretofore been unclear. The formation of sulfur oxide groups by SO_(2) and their effects on Hg adsorption on carbon was detailed examined by the density functional theory. The results show that SO_(2) can be oxidized into SO_(2) by oxygen group on carbon surface. Both C-SO_(2) and C-SO_(2)can improve Hg adsorption on carbon site, while the promotive effect of C-SO_(2) is stronger than C-SO_(2). Electron density difference analyses reveal that sulfur oxide groups enhance the charge transfer ability of surface unsaturated carbon atom, thereby improving Hg adsorption. The experimental results confirm that surface active groups formed by SO_(2) adsorption is more active for Hg adsorption than the groups generated by SO_(2).

关 键 词：Sulfur dioxide MERCURY Carbon sorbent Adsorption mechanism 

分 类 号：X701[环境科学与工程—环境工程]