الفهرس 
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Abstract
Silica nanoparticles are gaining more and more interest within the scientific milieu. Different applications of these nanoparticles were mentioned in the first chapter. As for our interest, the silica nanoparticles were prepared via a sol gel method and were found to be of average size (35 nm). Further treatment with Cyanex 921 molecules were conducted for the functionalization of the prepared nanoparticles. Environmental applications for wastewater treatment were investigated through adsorption and sorptive floatation studies for treatments of methylene blue and cobalt ions, respectively. Different factors influencing the adsorption process of methylene blue onto the Cyanex 921 modified silica nanoparticles were examined through batch experiments. These affecting parameters include; pH, temperature, contact time, dose of adsorbent and dye concentration. The nanoparticles under investigation were proved to be effective as metthylene blue remover. The usage of floataion cells for separation of cobalt ions by Cyanex 921 modified silica nanoparticles was evaluated using oleic acid as surfactent. Assessment of the effects of different parameters were conducted including; pH, sorbent concentration, metal ion concentration, surfactent concentration, temperature, shaking time, volume, ionic strenght and interferring ions. As microbial contamination is a problem of a great concern, our prepared nanoparticles were subjected to investigation as potential antimicrobial materials against different microbial isolates including Candida albicans, MRSA, E.coli, Sallomenla spp., Pseudomonas spp. and Klebsiella spp.