الفهرس 
Chapter 1 IntroductionOnly 14 pages are availabe for public view
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Abstract
Industrial or sanitary wastewater, which is rich in heavy metals, dyes, and pesticides, represents one of the most important environmental pollutants facing researchers. So, they are working to fabricate environmentally friendly polymers that have a high ability for absorption. Chitosan (CS) is a natural biopolymer that was obtained from shrimp shells using four stages deproteinization, demineralization, decoloration, and deacetylation. In addition, carbon nanoparticles (C-NPs) that were obtained from the treatment of the agricultural wastes were used with the CS to prepare CS/C-NPs nanocomposite (CS/C-NC) and calcium carbonate nanoparticles (CaCO3-NPs) that were used with CS to prepare (CS/CaCO3-NC). Fourier Transform Infrared Spectroscopy (FTIR), transmission electron microscope (TEM), and XRD were used to characterize the prepared adsorbents. The prepared CS, C-NPs, and CS/C-NC were used in water treatment for adsorption of metal ions (Cr3+, Cu2+, Zn2+, Ni2+, Cd2+, and Pb2+) and Metalaxyl as a type of pesticides. The adsorption by the prepared samples was investigated under various conditions such as contact time, doses of adsorbents, and concentration of adsorbates. The kinetic using pseudo-first and second-order, as well as isotherm using Langmuir and Freundlich isotherm models, were studied.
The results exhibited that the quantity of the heavy metals ions and Metalaxyl uptake by CS/C-NC was higher than chitosan alone. The kinetic studies of the absorption of CS and CS/C-NC for various ions obey Pseudo-second-order. Moreover, the isotherm studies obey the Langmuir isotherm for CS whereas obey the Freundlich isotherm for CS/C-NC except for Zn ions that obey Langmuir isotherm. While the adsorption of Metalaxyl highly agrees with Pseudo-second-order and Langmuir isotherm models using CS/C-NC.