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

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• 作者：Wei Fan¹ ; ^{fanw100@nenu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xuehui Jiang¹ ; Ying Lu² ; Mingxin Huo¹ ; Shanshan Lin¹ ; ^{linss071@nenu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhi Geng¹
• 关键词：Graphene oxide ; Porous media ; Transport ; Surfactants ; Numerical modeling ; DLVO
• 刊名：Journal of Environmental Sciences
• 出版年：2015
• 出版时间：1 September 2015
• 年：2015
• 卷：35
• 期：Complete
• 页码：12-19
• 全文大小：768 K

文摘

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 200 mmol/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.