کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
611196 880669 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of particle size and natural organic matter on the migration of nano- and microscale latex particles in saturated porous media
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Effect of particle size and natural organic matter on the migration of nano- and microscale latex particles in saturated porous media
چکیده انگلیسی

In the interest of fully assessing the potential environmental risks linked to “nanolitter,” we need to be able to predict the persistence, toxicity, and mobility of engineered nanomaterials in the natural subsurface environment. To examine the effects of particle size and natural organic matter on nanoparticle mobility, laboratory-scale filtration experiments were performed using different sized model nanomaterials (i.e., latex colloids having diameters of 50, 110, and 1500 nm) in the presence and absence of 5.0 mg/L Suwannee River humic acid (SRHA). At low ionic strengths (1–10 mM KCl), an increase in attachment efficiency (α) with increasing particle size was observed. This result contrasts with predictions of particle filtration based on attachment in the primary energy minimum of the particle–grain interaction energy profile evaluated using Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The presence of SRHA generally resulted in a decrease in α over the range of experimental conditions investigated. Results of particle transport experiments combined with particle characterization measurements suggest that the decrease in colloid attachment in the presence of SRHA is related to the combined influence of the mechanisms of charge stabilization and steric stabilization.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 321, Issue 1, 1 May 2008, Pages 74–83
نویسندگان
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