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Chemical composition-dependent removal of cationic surfactants by carbon nanotubes
Gao, Qian1; Wu, Fan1; Hu, Jing1; Chen, Weixiao1; Zhang, Xinyu1; Guo, Xiaoying1; Wang, Bin2; Wang, Xilong1
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
2020-05-10
ISSN0048-9697
Volume716
Indexed BySCI
Abstract

How to attenuate water surfactant pollution using carbon nanomaterials (CNMs) has been gaining increasing research attention in recent years. However, how the composition of cationic surfactants and physicochemical properties of CNMs may affect cationic surfactant maximum removal efficiency (Refficiency-max) with minimal cost from the aqueous phase and the associated mechanisms remain largely unclear. To address this knowledge gap, we compared removal efficiency of three cationic surfactants including dodecyl dimethyl benzyl ammonium chloride (DDBAC), tetradecyl dime thyl benzyl ammonium chloride (TDBAC) and hexadecyltrimethylammonium bromide (CTAB) by various carbon nanotubes (CNTs), including pristine and OH- or COOH-functionalized multiwalled-(MWCNTs) and single-walled (SWCNTs) CNTs. The results showed that Refficiency-max of CTAB by pristine MWCNTs with an outer diameter OD < 8 nm is 50.36 +/- 0.56%, while that by OH-MWCNTs with OD< 8 nm is merely 22.72 +/- 0.21%. Surface area and porosity of CNTs strongly affect Refficiency-max of cationic surfactants. The MWCNTs with a smaller OD have a higher Refficiency-max than that with a larger one especially for CTAB, due to their larger surface area and porosity. Among various CNTs, SWCNTs is an ideal choice for removing cationic surfactants, especially for non-aromatic CTAB. Interestingly, for most cases, cationic surfactant removal by CNTs decreased when the amount of CNTs added exceeded a certain level, attributable to their aggregation. This implies that it is impossible to completely remove some cationic surfactants even when excess CNTs were added. The n-n bonding dominates over hydrophobic interaction in regulating cationic surfactant removal especially for those with aromatic structure. Aromatic cationic surfactants such as DDBAC and TDBAC can be removed more readily by CNTs than those without a benzene ring due to their strong n-n interactions. TDBAC has a longer hydrophobic chain relative to DDBAC, leading to a better removal efficiency by CNTs, due to stronger hydrophobic interaction. (C) 2020 Elsevier B.V. All rights reserved.

KeywordCationic surfactant QUATERNARY AMMONIUM-COMPOUNDS Carbon nanotubes ORGANIC-CHEMICALS Removal COMPOUNDS QACS Aggregation ADSORPTION Application MECHANISMS TOXICITY SORPTION FATE
Subject Area公共卫生
SubtypeArticle
DOI10.1016/j.scitotenv.2020.137017
WOS HeadingsScience & Technology
Language英语
Funding OrganizationNational Science Fund for Distinguished Young Scientist ; National Natural Science Foundation of China
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000519987300029
Correspondent Emailxilong@pku.edu.cn
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bjmu.edu.cn/handle/400002259/161422
Collection北京大学公共卫生学院
北京大学公共卫生学院_公共卫生学院
北京大学第二临床医学院_党委院长办公室
北京大学第三临床医学院_神经内科
Affiliation1.Peking Univ, Lab Earth Surface Proc, Coll Urban & Environm Sci, Beijing 100871, Peoples R China;
2.Peking Univ, Sch Publ Hlth, Beijing 100191, Peoples R China;
3.Peking Univ, Lab Earth Surface Proc, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
First Author AffilicationPEKING UNIVERSITY HEALTH SCIENCE CENTER
Recommended Citation
GB/T 7714
Gao, Qian,Wu, Fan,Hu, Jing,et al. Chemical composition-dependent removal of cationic surfactants by carbon nanotubes[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,716.
APA Gao, Qian.,Wu, Fan.,Hu, Jing.,Chen, Weixiao.,Zhang, Xinyu.,...&Wang, Xilong.(2020).Chemical composition-dependent removal of cationic surfactants by carbon nanotubes.SCIENCE OF THE TOTAL ENVIRONMENT,716.
MLA Gao, Qian,et al."Chemical composition-dependent removal of cationic surfactants by carbon nanotubes".SCIENCE OF THE TOTAL ENVIRONMENT 716(2020).
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