Functionalized nanoparticle interactions with polymeric membranes

JOURNAL OF HAZARDOUS MATERIALS

卷:211

Article

Ladner, D. A.¹  Steele, M.¹  Weir, A.²  Hristovski, K.^2,3  Westerhoff, P.² 

[1] Clemson Univ, Dept Environm Engn & Earth Sci, Clemson, SC 29631 USA

[2] Arizona State Univ, Sch Sustainable Engn & Built Environm, Tempe, AZ USA

[3] Arizona State Univ, Coll Technol & Innovat, Mesa, AZ USA

关键词: Microfiltration;    Ultrafiltration;    Adsorption;    Separation;    Fouling;   

DOI  :  10.1016/j.jhazmat.2011.11.051

来源: Elsevier

【 摘 要 】

A series of experiments was performed to measure the retention of a class of functionalized nanoparticles (NPs) on porous (microfiltration and ultrafiltration) membranes. The findings impact engineered water and wastewater treatment using membrane technology, characterization and analytical schemes for NP detection, and the use of NPs in waste treatment scenarios. The NPs studied were composed of silver, titanium dioxide, and gold; had organic coatings to yield either positive or negative surface charge; and were between 2 and 10 nm in diameter. NP solutions were applied to polymeric membranes composed of different materials and pore sizes (ranging from similar to 2 nm [3 kDa molecular weight cutoff] to 0.2 mu m). Greater than 99% rejection was observed of positively charged NPs by negatively charged membranes even though pore diameters were up to 20 times the NP diameter; thus, sorption caused rejection. Negatively charged NPs were less well rejected, but behavior was dependant not only on surface functionality but on NP core material (Ag, TiO2, or Au). NP rejection depended more upon NP properties than membrane properties; all of the negatively charged polymeric membranes behaved similarly. The NP-membrane interaction behavior fell into four categories, which are defined and described here. (c) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free