Filtration of Nanoparticles with Dimethyldioctadecylammonium Bromide Treated Microporous Polypropylene Filters
نویسندگان
چکیده
Microporous polypropylene membrane filters are modified with a cationic surfactant, dimethyldioctadecylammoniumbromide (DDAB), to create a charged surface. Negatively charged nanoparticles can then be filtered by utilizing the electrostatic interaction between the charged particles and the polar heads of the surfactants adsorbed on the filters. The study focuses on particle adsorption and particle filtration. Particle adsorption studies have shown that particle adsorption can be increased significantly with this treatmentdue toCoulombicattraction. Filtrationresults for60nmnegatively chargedparticles (carboxylate modified copolymer) filtered through DDAB treated filters show a significant increase in particle capture efficiency. Capture efficiency is dependent on the pH of the suspension due to competitive adsorption between thehydroxide ionsand thenegatively chargednanoparticles. As themeanporediameter increases, capture efficiency decreases due to the increase in distance between the particles and the charged filter surface. Filtration efficiency can be increased from 10% to 95% by surface modification of the filters.
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