Effects of surfactants on graphene oxide nanoparticles transport in saturated porous media.

Wei Fan, Xuehui Jiang, Ying Lu, Mingxin Huo, Shanshan Lin, Zhi Geng

Journal: Journal of environmental sciences (China) 2016;35():12-19

PMID: 26354687

Full Text on Elsevier Science View on PubMed

Abstract

Transport behaviors of graphene oxide nanoparticles (GONPs) in saturated porous media were examined as a function of the presence and concentration of anionic surfactant (SDBS) and non-ionic surfactant (Triton X-100) under different ionic strength (IS). The results showed that the GONPs were retained obviously in the sand columns at both IS of 50 and 200mmol/L, and they were more mobile at lower IS. The presence and concentration of surfactants could enhance the GONP transport, particularly as observed at higher IS. It was interesting to see that the GONP transport was surfactant type dependent, and SDBS was more effective to facilitate GONP transport than Triton X-100 in our experimental conditions. The advection-dispersion-retention numerical modeling followed this trend and depicted the difference quantitatively. Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction calculations also were performed to interpret these effects, indicating that secondary minimum deposition was critical in this study.

Address: School of Environment, Northeast Normal University, Changchun 130117, China. Electronic address: [email protected].; School of Environment, Northeast Normal University, Changchun 130117, China.; Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China.; School of Environment, Northeast Normal University, Changchun 130117, China. Electronic address: [email protected].

DOI: 10.1016/j.jes.2015.02.007

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MeSH Terms: Environmental Monitoring, Graphite, Models, Theoretical, Nanoparticles, Octoxynol, Osmolar Concentration, Oxides, Porosity, Silicon Dioxide, Surface-Active Agents