کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6327515 | 1619766 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transport of graphene oxide in saturated porous media: Effect of cation composition in mixed Na-Ca electrolyte systems
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The influence of cation composition in mixed Na-Ca electrolyte systems on the transport of graphene oxide particles in saturated porous media was studied. Column experiments were conducted to elucidate the transport behavior of GO by varied molar ratios of Ca2Â +/Na+ but of constant ionic strength (IS). The results show that retention of GO in sand column is strongly dependent on IS in the presence of Ca2Â +, featuring serious deposition rates (Rd) at the higher IS of 10Â mM. The maximum Rd was 48.22% at 1Â mM and 98.53% at 10Â mM. However, there was no obvious difference in GO retention in solutions that only contained Na+ when the IS increased from 1 to 10Â mM, and the Rd was 35.17% and 38.21% respectively. The molar ratio of Ca2Â +/Na+ in solution was much more influential in altering the particle retention behavior at the higher IS of 10Â mM, compared with little influence at 1Â mM. It was supposed that compression of diffuse double layers mainly controlled GO deposition under lower IS, while charge neutrality and metal (Ca2Â +) bridging played a significant role at the higher IS. A numerical advection-dispersion-retention model considering the combined processes of Langmuirian dynamics blocking and depth-dependent straining was successfully developed to simulate the transport process of GO through the sand column. Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy calculations were also performed to better understand the mechanisms of GO mobility. Coupling analysis of breakthrough experiments, DLVO theory and numerical modeling in this work provides insight into the mechanisms of GO transport in saturated porous media and is useful for reliable prediction of nanoparticle penetration through the vadose zone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 511, 1 April 2015, Pages 509-515
Journal: Science of The Total Environment - Volume 511, 1 April 2015, Pages 509-515
نویسندگان
W. Fan, X.H. Jiang, W. Yang, Z. Geng, M.X. Huo, Z.M. Liu, H. Zhou,