title: Transport of surfactant-facilitated multiwalled carbon nanotube suspensions in columns packed with sized soil particles.
abstract: Transport of carbon nanotubes (CNTs) in soil/sediment matrixes can regulate their potential eco-effects and has been however rarely studied. Herein, column experiments were conducted to investigate mobility of CNT suspensions stabilized by dodecylbenzenesulfonic acid sodium salt (SDBS), octyl-phenol-ethoxylate (TX-100) and cetylpyridinium chloride (CPC) in four soil samples with certain particle sizes. Humic acid was extracted from a soil sample and was coated on quartz sands to explore the effect of soil organic matter (SOM) on the mobility. Results showed that the positively-charged CPC-CNT was entirely retained in the columns while the negatively-charged SDBS-CNT and TX-100-CNT more or less broke through the columns. Pearson correlation analyses revealed that soil texture rather than SOM controlled the mobility. Electrostatic attraction to and/or precipitation on the grain surfaces together with the straining effect could explain the CNT retention. These novel results will help to understand the eco-effects of CNTs.
authors.affiliation: Zhejiang University, Department of Environmental Science, Hangzhou 310058, China.
authors.forename: Yinying
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Zhejiang University, Department of Environmental Science, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Yang
authors.affiliation: Zhejiang University, Department of Environmental Science, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, China. Electronic address: lindaohui@zju.edu.cn.
authors.forename: Daohui
authors.initials: D
authors.lastname: Lin
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry; D006812:Humic Substances; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011791:Quartz / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013535:Suspensions / Q000737:chemistry
chemical_list: D001557:Benzenesulfonates; D006812:Humic Substances; D037742:Nanotubes, Carbon; D012987:Soil; D013501:Surface-Active Agents; D013535:Suspensions; C551282:polyethylene glycol monooctylphenyl ether; D011791:Quartz; D011092:Polyethylene Glycols; C001114:dodecylbenzenesulfonic acid
keywords: Breakthrough curves; Humic acid; Nanomaterial; Soil column; Surfactant