title: Cotransport of multi-walled carbon nanotubes and titanium dioxide nanoparticles in saturated porous media.
abstract: The cotransport of multi-walled carbon nanotubes (MWCNTs) and nanoscaled titanium dioxide (nano-TiO2) in porous media were investigated in 1 and 10 mM NaCl at both pH 5 and 7. Nano-TiO2 decreased MWCNTs transport under all conditions. The increased MWCNTs deposition at pH 5 was due to MWCNTs deposition onto previously deposited nano-TiO2 and codeposition of nano-TiO2-MWCNTs aggregates; whereas, codeposition of nano-TiO2-MWCNTs aggregates contributed to the increased MWCNTs deposition at pH 7. MWCNTs increased nano-TiO2 transport under all conditions except in 10 mM NaCl at pH 5. MWCNTs facilitated transport drove to the increased nano-TiO2 transport in 1 mM NaCl at pH 5; whereas, competition of deposition sites and stabilization of nano-TiO2 by MWCNTs mainly caused the increased nano-TiO2 transport at pH 7. Although MWCNTs didn't affect nano-TiO2 breakthrough curve in 10 mM NaCl at pH 5, concurrent aggregation induced straining yet shifted nano-TiO2 retained profile from log-linear to hyper-exponential decreases.
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
authors.forename: Xueting
authors.initials: X
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Cai
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Han
authors.affiliation: Department of Environmental Sciences, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Daohui
authors.initials: D
authors.lastname: Lin
authors.affiliation: Department of Mineral Resources and Energy Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
authors.forename: Hyunjung
authors.initials: H
authors.lastname: Kim
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China. Electronic address: tongmeiping@pku.edu.cn.
authors.forename: Meiping
authors.initials: M
authors.lastname: Tong
mesh_terms: D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000032:analysis / Q000737:chemistry*; D016062:Porosity; D014025:Titanium / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium
keywords: Cotransport; Deposition; MWCNTs; Nano-TiO(2); Porous media