الفهرس 
Title : Upgrading and surface modification of some natural clay minerals for removal of organic pollutants from aqueous media /
العنوان العربي : تطوير وتعديل خواص السطح لبعض المعادن الطينية وإستخدامها لإزالة الملوثات العضوية من المحاليل المائيةOnly 14 pages are availabe for public view
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Abstract
Pesticides are among the stable and long-life pollutants in water, where their removal took intensive studies.This issue was introduced in many previous attempts such as upgrading the pillared clays (PILCs) properties by enhancing porosity, pore-volume, surface area and synthesis route as well. This study describes the synthesis of [Al₁₃O₄(OH)₂₄(H₂O)₁₂]⁷⁺ and [Al₃₀O₈(OH)₅₆(H₂O)₂₄]¹⁸⁺ ( Al₁₃) and (Al₃₀ ) respectively Keggin cations as pillars for bentonite intercalation to yield composites of aluminum pillared bentonite (Al-PILB) composites. The resultant Al-PILB composites are of promising adsorption and maintaining some chlorinated pesticides. Various ratios of the synthesized cations were inserted in natural bentonite (BT) as nitrate form. By following modified concentration method in synthesis. In order to maintain better intercalation, uniform stacking of (BT) layers and meeting industrial scale as well. The Al-PILB composites were characterized by various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), Fourier transform infrared (FTIR spectroscopy), UV-vis spectroscopy and N2 adsorption-desorption measurements. Increases in basal spacing, surface area, and pores volume were observed. Adsorption of heptachlor epoxide, dieldrin and endrin were achieved using (BT-Al₃₀, BT-Al₁₃/Al₃₀, BT-Al₁₃/2Al₃₀, BT-2Al₁₃/Al₃₀) composites in addition to BT. The significant adsorption capability for all Al-PILB composites containing high percent of Al30 polyoxycations (BT-Al30 and BT-Al₁₃/Al₃₀ ) is attributed to the porous structure characteristic and high surface area of these composites