الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The aim of the present investigation is to prepare activated carbon from papyrus plant and using it in separation and pre-concentration of certain inorganic pollutants (Mercury and Cadmium) and organic pollutants (Methylene Blue) from aqueous solution. It includes the preparation and characterization of different adsorbents:Dried ( DP) were prepared by soaking of papyrus plant in 0.036 M EDTA at pH 10 overnight, washing with distilled water for several times and drying in oven at 110 ºC for 48 h . Activated carbon samples (SAC, PAC) were prepared by soaking dried in 50 wt. % analytical grade H3PO4 and H2SO4 (1:3) for 48 h following by carbonization at 550 - 600 ºC for 4h, washing and drying. Oxidized activated carbon samples (OSAC, OPAC) were prepared by refluxing SAC and PAC in nitric acid solution (1:10 dilution from 69% concentrated HNO3 acid) at a ratio of 1 g AC to 10 ml nitric acid solution for 3 h at 100 ºC, washing and drying. characterization of the investigated carbons was made by determining surface pH, point of zero charge, FTIR spectra, surface porosity (SEM) and surface area (BET equation) , studying the effect of pH, initial pollutant concentration, contact time, adsorbent dosage and temperature on the adsorption of different pollutants onto different samples. The adsorption of pollutants increased with increased pH, initial concentration, contact time, and adsorbent dosage. The experimental data were fitted well with the linear form of Langmuir model. Adsorption kinetics followed a pseudo second-order model. Thermodynamic parameters, including ΔGº, ΔHº, and ΔSº for the adsorption process of different pollutants from aqueous solution onto different adsorbents indicated that adsorption was endothermic and spontaneous process. Desorption were investigated using HCL, the results revealed that the percent recovery of pollutant increased with the increase of HCL from 0.3 to 1 M of methylene blue and then remained constant.