الفهرس 
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Abstract
A new coordination polymer has been synthesized as an adsorbent based on silver ion as node and melamine as linker (AgM-CP). The product (AgM-CP) has been characterized by appropriate techniques (Raman spectra, FTIR, XRD, SC-XRD …).
The prepared adsorbent with cationic framework has been applied for removal of chromium (Cr (VI)) oxyanions and 4-Aminosalysalic Acid Sodium Salt (ASAS) from aqueous solution by adsorption anionic exchange.
The equilibrium isotherms have been measured and analyzed using the Langmuir and Freundlich models. The maximum adsorption capacities are 50 mg/g and 24 mg/g for Cr (VI) oxyanions and ASAS, respectively.
It was found that the Freundlich model best fits the experimental data over the whole concentration range.
Thermodynamic parameters of adsorption, have been calculated. For both contaminants, ∆Gads values are negative indicating adsorption spontaneity. Also, ∆Hads values are generally positive indicating overall endothermic adsorption process. In addition, ∆Sads values are positive indicating general increase of disorder.
The adsorption kinetic of Cr (VI) oxyanions and ASAS onto AgM-CP has been performed using a series of batch agitated adsorber. The experimental results have been analyzed using Pseudo First-order (PFO) and Pseudo Second-order (PSO) as kinetic models. PFO model generally best fits experimental data for all applied conditions.
Mass transfer during the adsorption of Cr (VI) oxyanions and ASAS onto AgM-CP have been performed. The results by D-B and W-M models showed that both of them have been fit experimental results.
The results demonstrate that the new adsorbent is very effective in the removal of Cr (VI) oxyanions and ASAS from aqueous solution and can be used as alternative of high cost commercial adsorbents.
Keywords: Prepared Adsorbent (AgM-CP); SEM; SC-XRD; PXRD; Adsorbates (Cr-oxyanion; 4-Aminosalicylic Acid Sodium Salt); Isotherm Models; Kinetic Models; Mass Transfer Models; Thermodynamic Parameters.