الفهرس 
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Abstract
Recently, several types of nano materials have gained attention as promising nano-adsorbents to remove heavy metals, dyes from wastewater such as nano activated carbon and layered double hydroxides (LDH).In this work, Nano Activated carbon(NAC) samples was prepared by different activation process such as physical and chemical activation .In this study activated carbon was prepared from sawdust by physical method. We used the prepared NAC to remove heavy metal ions (iron (III) (Fe3+) and chromium (VI) (Cr6+)) by using the adsorption mechanism. Adsorption parameters, such as dose, contact time and initial concentration of the heavy metal ions, were investigated the adsorption capacities of NAC was 47.00 and 45.00 mg/g for iron (III) and chromium (VI), respectively. Fe-Zn-Co-Ni LDH was synthesized by a simple co-precipitation method. The prepared material was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR), transmission electron microscope (TEM), and zeta potential measurements. The performance of this LDH for the uptake of anionic dye, methyl orange (MO, was studied under numerous adsorption factors such as the solution pH, contact time, dye initial concentration, and adsorbent dosage. The XRD data showed that the crystallite size of LDH after MO adsorption (MO@LDH) is 93.1 nm which increased compared with that of bare LDH (12.7 nm)owning to the adsorption of MO on LDH surface. Two new FTIR peaks have appeared for MO@LDH owning to the bending vibrations of the MO functional groups C-N and C-H. The maximum adsorption capacity for the prepared MO@LDH was 418 mg/g and it reached the equilibrium state at 60 min. The adsorption kinetic obeyed the pseudo-first order model. Finally, the LDH showed a promising antibacterial effect toward both Gram-negative and Gram-positive bacteria.
Keywords: Nano-adsorbent; NAC,heavy metals, MO; Fe-Zn-Co-Ni LDH; Wastewater treatment; Adsorption.