الفهرس 
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Abstract
In the present work thioglycolic acid and Xanthurenic acid were successfully introduced on the surface of amino derivative of MCM-41 (amino-MCM-41) by the assistant of microwave radiation, forming a promising adsorbents (MW- MCM-41-TgA and MW- MCM-41-XA, respectively). The modified MCM-41 phases were characterized by physical and chemical methods. The prepared sorbents show good adsorption capacity for Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+, Th4+ and U6+ without interference from most ions. The maximum adsorption capacities at the optimized conditions were higher than other sorbents in the literature. The thermodynamic studies indicated that the adsorption processes are spontaneous and exothermic. The prepared sorbents could be utilized frequently while the adsorption efficiencies recorded above 95% after 10 adsorption-desorption cycles. The procedure was applied for preconcentration of Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+, Th4+ and U6+ from different real samples prior to measurement by ICP-OES with satisfying results.