The present investigation deals with preparation of three different adsorbent materials namely; potassium hydroxide activated carbon based apricot stone (C), calcium alginate beads (G) and calcium alginate/activated carbon composite beads (GC) were used for the removal of arsenic. The prepared adsorbent materials were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), N2-adsorption at -196°C and point of zero charge. From the obtained results, it was found that the porosity, surface area and total pore volume of the adsorbent material C>GC>G respectively, however, the G adsorbent has more acidic function group than the other adsorbents. The influence of pH, time, temperature and initial concentration of arsenic(V) were studied and optimized. GC exhibits the maximum As(V) adsorption (66.7mg/g at 30°C). The adsorption of arsenic ions was observed to follow pseudo-second order mechanism as well as the thermodynamic parameters confirm also the endothermic spontaneous and a physisorption process.

CEITEC IPM Institute of Physics of Materials Academy of Sciences of the Czech Republic Žižkova 22 CZ 61662 Brno Czech Republic

Central European Institute of Technology Brno University of Technology Brno Czech Republic; Textile Research Division National Research Center Dokki Giza P O 12622 Egypt

Chemistry Department Faculty of Science Damanhour University Damanhour Egypt

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A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment