الفهرس 
Scope of the studyOnly 14 pages are availabe for public view
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Abstract
The purpose of carrying out this work is to remove heavy metals and for the mitigation of waterborne microorganisms for water treatment. Nanocomposites of chitosan and its nanoparticles with metal NPs (Ag and Cu) were prepared with four different ratios (0.2%, 1%, 3% and 5%). Ionic gelation method was used for the preparation of chitosan nanoparticles then chitosan-nano metal composites were prepared simply by addition of nano metal dispersion to chitosan solution. In vitro antimicrobial activities of the prepared composites were found to be much better than free chitosan when examined against gram-positive bacteria (Bacillus cereus), gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa). Chitosan NPs and its composites showed the highest
antibacterial activity, so it was further investigated for the effect of time and concentration. The composites started to show complete inhibition with 2% concentration for Pseudomonas aeruginosa and after 20 min, while for Bacillus cereus after 30 min and 60 min for Escherichia coli. All the results showed that chitosan-metal NPs and chitosan NPs are promising candidates for novel antimicrobial agents that can be used in many fields.
All the prepared composites were characterized by FT-IR, XRD, TGA, SEM and HRTEM.
A Polymer nanocomposite of chitosan is the second most abundant natural polymer. The functionalized Multiwall Carbon Nanotubes (FMWCNTs) were prepared by chemical vapor deposition method. The composites were prepared using simple addition method in three different ratios of MWCNTs. Homogenous nanocomposites were obtained. The morphological properties of the chitosan/multiwall carbon nanotubes were investigated using scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM),
fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD). The morphological characterization indicates a successful modification with great changes in the characteristics of the polymer surface. The chitosan/FMWCNTs nanocomposite was used to remove copper, cadmium, and lead ions from aqueous solution. The nanocomposites showed a great efficiency for the removal of these metal ions from the aqueous solution. from the obtained results, it was found that, the copper uptake capacity reaches up to 100 mg/g using adsorbent dose 0.05g, 500 ppm as initial concentration within 60 min. The cadmium and lead uptake capacity reaches up to 250 mg/g using 0.05 g adsorbent for 10 ml metal solution during 60 min. The results suggested that this novel chitosan/FMWCNTs nanocomposite could be used for removing heavy metal ions from water.