title: Influence of graphene oxide on the transport and deposition behaviors of colloids in saturated porous media.
abstract: The effects of graphene oxide (GO) on the transport and deposition behaviors of colloids with different sizes in packed quartz sand were investigated in both NaCl (10 and 50 mM) and CaCl2solutions (1 and 5 mM) at pH 6. Fluorescent carboxylate-modified polystyrene latex microspheres (CMLs) with size ranging from 0.2 to 2 μm were utilized as model colloids. Both breakthrough curves and retained profiles of colloids in the presence and absence of GO in suspensions under all examined solution conditions were analyzed. The breakthrough curves of all three different-sized CMLs with GO were higher yet the retained profiles were lower than those without GO at both examined ionic strengths in NaCl solutions. The observation showed that GO increased the transport and decreased the deposition of all three different-sized CMLs in NaCl solutions. However, in CaCl2solutions, opposite observation was achieved at two different ionic strength conditions. Specifically, the presence of GO increased the transport and decreased the deposition of all three different-sized CMLs in 1 mM CaCl2solutions, whereas, it decreased the transport and increased the deposition of all three different-sized CMLs in 5 mM CaCl2solutions. Comparison the breakthrough curves and retained profiles of CMLs versus those of GO yielded that the overall transport and deposition behaviors of all three different-sized CMLs with GO copresent in suspensions agreed well with the transport and deposition behaviors of GO under all examined conditions. The transport and deposition behaviors of CMLs in packed porous media clearly were controlled by those of GO under the conditions investigated in present study due to the adsorption of CMLs onto GO surfaces. Our study showed that once released into natural environment, GO would adsorb (interact with) different types of colloids and thus have significant influence on the fate and transport of colloids in porous media.
authors.affiliation: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, PR China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Peng
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: Dan
authors.initials: D
authors.lastname: Wu
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: Zhi
authors.initials: Z
authors.lastname: Ge
authors.affiliation: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, PR China; 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
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. Electronic address: kshjkim@jbnu.ac.kr.
authors.forename: Hyunjung
authors.initials: H
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D003102:Colloids / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D008863:Microspheres; D008956:Models, Chemical; D009994:Osmolar Concentration; D010087:Oxides; D011137:Polystyrenes; D016062:Porosity; D011791:Quartz; D012822:Silicon Dioxide; D012965:Sodium Chloride; D012996:Solutions; D013535:Suspensions
chemical_list: D003102:Colloids; D010087:Oxides; D011137:Polystyrenes; D012996:Solutions; D013535:Suspensions; D011791:Quartz; D012965:Sodium Chloride; D012822:Silicon Dioxide; D006108:Graphite; C024075:styrofoam
keywords: Adsorption; Colloid transport; Cotransport; Graphene oxide; Quartz sand