Author/Authors :
Sabermahani Fatemeh نويسنده Department of Chemistry, Payame Noor University, P.O. BOX 19395-4697 Tehran, Iran , Madadi Mahani Nosrat نويسنده Department of Chemistry, Payame Noor University, P.O. BOX 19395-4697 Tehran, Iran , Irannejad Leyli نويسنده Department of Chemistry, Payame Noor University, P.O. BOX 19395-3697 Tehran, Iran
Abstract :
نانوكامپوزيت مغناطيسي پلي آنيلين/ماگميت (PANI/? -Fe2O3 MNC) به عنوان يك واكنشگر فعال براي حذف سرب از محيط هاي آبي استفاده شد. روش همرسوبي شيميايي براي تهيه نانوذرات ماگميت بكار رفت و به دنبال آن نانوكامپوزيت مغناطيسي از طريق پليمريزاسيون آنيلين تهيه گرديد. سطح آن توسط IR FT- مشخص گرديد. راندمان اين نانوكامپوزيت براي حذف سرب به روش ناپيوسته بررسي شد. نتايج نشان داد كه شرايط بهينه براي حذف سرب در 6= pH، مقدار جاذب 04/0 گرم و زمان تماس 90 دقيقه رخ مي دهد. سينتيك جذب مطالعه شد و با معادله سرعت مرتبه دوم مطابقت داشت. ايزوترم هاي جذب بررسي گرديدند. مدل ايزوترم جذبي فروندليچ تطابق بيشتري نسبت به لانگموير داشت. مطالعات ترموديناميكي دلالت برخودبخودي و گرماگير بودن فرايند جذب سرب داشت.
Abstract :
Polyaniline/maghemite magnetic nanocomposite (PANI/? -Fe2O3 MNC) was used as active agents for removal of lead ions from aqueous media. Chemical co-precipitation method was used to prepare the maghemite nanoparticles. Subsequently, the MNC was synthesized through polymerization of aniline. It was characterized by FT-IR.The ef?ciency of this MNC was estimated for Pb (II) removal by using batch method. The results showed that optimum conditions for lead removal were found to be at pH of 6, adsorbent dosage of 0.04 g and equilibrium contact time of 90 min. The kinetic of adsorption system have been studied based on the assumption of a pseudo-second order rate law. The adsorption isotherms were examined. The Freundlich adsorption isotherm model was found to represent the equilibrium adsorption isotherm better than Langmuir isotherm. The thermodynamic studies indicated that the adsorption was spontaneous and endothermic process for lead.
