الفهرس 
Title : Spectroscopic characterizations of synthetic zeolites for remediation of some heavy metals from wastewater and soil
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Abstract
The synthesized zeolite is characterized by different spectroscopic techniques XRD, XRF, SEM, and IR. Also, the concentration of heavy metals was analyzed by the ICP technique. The Cation Exchange Capacity (CEC) showed a high value of 401.09 meq/100 g clay for synthesized zeolite. Through the process of hydrothermal calcination (metakaolinization) of raw material (kaolin) at 800oC for 6 hours. The amorphous phase (metakaolinite) appeared at 24 hours. Metakaolinite was treated under hydrothermal with 1.0 M NaOH solution without additional catalysts as a silica source at 90oC/2d under atmospheric pressure to produce the zeolite crystals. Crystallization times of 48 hours created zeolite type Y. The concentrations of heavy metals in the solutions before and after treatments with adsorbent materials have followed at different times and concentrations. The three kinetic parameters for pseudo-first-order (PFO), pseudo-second-order (PSO), and intra-particle diffusion (IPD). Removal of heavy metals can be described by Langmuir, Freundlich, and Harkins-Jura sorption isothermal models to evaluate the adsorption behavior of synthetic zeolite, natural zeolite, and kaolin.