Impact of dilution on the transport of poly(acrylic acid) supported magnetite nanoparticles in porous media

详细信息    查看全文

• 作者：Dila Aksoy  ; Ersenkal^a ; Asu  ; Ziylan^a ; Nilsun H.  ; Ince^a ; Havva Yagci  ; Acar^b ; Miray  ; Demirer^b ; Nadim K.  ; Copty^a ;   ; ^{ncopty@boun.edu.tr}
• 关键词：Nanoparticle transport ; In-situ groundwater remediation ; Concentration ; Poly(acrylic acid) supported nanoparticles ; Iron oxide ; Time-moment analysis ; Transport modeling
• 刊名：Journal of Contaminant Hydrology
• 出版年：2011
• 出版时间：1 November 2011
• 年：2011
• 卷：126
• 期：3-4
• 页码：248-257
• 全文大小：673 K

文摘

This paper investigates the impact of dilution on the mobility of magnetite nanoparticles surface coated with poly(acrylic acid) (PAA). Transport experiments were conducted in a water-saturated sand-packed column for input nanoparticle solutions with total Fe concentrations ranging from 100 to 600 mg/L. Particle size analysis of the synthesized nanoparticle solutions showed that PAA provides good size stability for Fe concentrations as low as about 1 mg/L. Time-moment analysis of the nanoparticle breakthrough curves, on the other hand, revealed that nanoparticle mass recovery from the column decreased consistently with dilution, with greater attenuation, sharper fronts and longer tails compared to that of the tracer. Particle size analysis of the eluted solutions shows that the nanoparticle size is negatively correlated with nanoparticle concentration. Modeling results suggest that the decrease in nanoparticle mobility with input concentration can be represented using a kinetic time-dependent deposition term with finite deposition capacity and a kinetic detachment term. For field applications, the increase in particle size and detachment resulting from dilution means reduced transport efficiency of nanoparticles and reaction potential with travel distance.