Sorption mechanism of naphthalene by diesel soot: Insight from displacement with phenanthrene/p-nitrophenol  

作　　者：Wenhao Wu Yun Huang Daohui Lin Kun Yang 

机构地区：[1]Department of Environmental Science,Zhejiang University,Hangzhou 310058,China [2]Key Laboratory of Environmental Pollution and Ecological Health of Ministry of Education,Hangzhou 310058,China [3]Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control,Hangzhou 310058,China

出　　处：《Journal of Environmental Sciences》2021年第8期136-146,共11页环境科学学报（英文版）

基　　金：supported partly by the National Natural Science Foundation of China(Nos.21777138 and 21621005);the National Key Research and Development Program of China(No.2017YFA0207001);the Key Research and Development Program of Zhejiang Province(No.2019C03105);。

摘　　要：The nonlinear sorption of hydrophobic organic contaminants(HOCs)could be changed to linear sorption by the suppression of coexisting solutes in natural system,resulting in the enhancement of mobility,bioavailability and risks of HOCs in the environment.In previous study,inspired from the competitive adsorption on activated carbon(AC),the displaceable fraction of HOCs sorption to soot by competitor was attributed to the adsorption on elemental carbon fraction of soot(EC-Soot),while the linear and nondisplaceable fraction was attributed to the partition in authigenic organic matter of soot(OM-Soot).In this study,however,we observed that the linear and nondisplaceable fraction of HOC(naphthalene)to a diesel soot(D-Soot)by competitor(phenanthrene or p-nitrophenol)should be attributed to not only the linear partition in OM-Soot,but also the residual linear adsorption on EC-Soot.We also observed that the competition on the surface of soot dominated by external surface was different from that of AC dominated by micropore surface,i.e.,complete displacement of HOCs by p-nitrophenol could occur for the micropore surface of AC,but not for the external surface of soot.These observations were obtained through the separation of EC-Soot and OM-Soot from D-Soot with organic-solvent extraction and the sorption comparisons of D-Soot with an AC(ACF300)and a multiwalled carbon nanotube(MWCNT30).The obtained results would give new insights to the sorption mechanisms of HOCs by soot and help to assess their environmental risks.

关 键 词：Competitive sorption Diesel soot Organic compounds LINEARITY External surface 

分 类 号：X701[环境科学与工程—环境工程]