الفهرس 
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Abstract
A new synthesis procedure was developed to create a highly porous nanocomposite material that has high sorption ability for water contaminants. Biochar is produced by a mean of a pyrolysis unit from slow pyrolysis(600 and 800 °C) of rice straw biomass; it was analyzed for its physicochemical changes with the different pyrolysis temperature. To study the physico-chemical nature of biochar samples, analyses such as XRD, FTIR, TGA, ICP, the BET surface area analyzer and transmission electron microscopy (TEM) were performed. The kinetic and adsorption studies experiment was conducted to determine the sorption ability of MgO-biochar nanocomposites to (NH3-N) solutions. Adsorption studies were modeled with Langmuir and Freundlich adsorption isotherms. Careful evaluation for using rice straw biochar (RSB) as nano-absorbent material was performed in Kohafa waste water treatment plants (QWWTP), Fayoum, Egypt. The RSB give maximum removal (89.66 and 82.86%) for BOD5 and COD, respectively at contact time one hour and weight 0.7 g. However, NO3--N reached up to 57.78%, while for NH3-N, the maximum removal reached 62.86 %. For total phosphorus, Cu(II), Zn(II) and Pb(II), it reached 77.26, 97.92 , 99.38 and 100%, respectively. In addition, the physical parameter TSS the maximum removal reached 93.84%, and TDS increases due to the presence of ash in the RSB samples .The study concluded that the use of RSB in the Kohafa waste water treatment plants served in the elimination of the different pollutants, save power and time.