نوع مقاله : مقاله پژوهشی کامل
نویسنده
چکیده
نانوکامپوزیت پلی پیرول/ سبوس برنج/ Fe3O4 بعنوان یک جاذب برای حذف موثر سرب
آلودگی عناصر سنگین خصوصا سرب رفتار ویژه ای برروی سلامتی انسان و محیط زیست دارد. در این مطالعه نانوکامپوزیت پلی پیرول/ سبوس برنج/ Fe3O4 ( Fe3O4/Rh/ppy ( سنتز و برای حذف سرب از محیطهای آبی استفاده شد. در ابتدا نانوذره مغناطیسی Fe3O4 با یک روش ساده و یک مرحله ای آماده و سپس پلی پیرول برای کارایی بیشتر جاذب به طریق شیمیایی برروی سطح نانوذره قرار گرفت. FeCl3 بعنوان اکسید کننده برای اکسیداسیون پیرول استفاده شد. نانوکامپوزیت جدید توسط FT-IR SEM , وDLS مورد بررسی قرار گرفت. اثر pH ، زمان تماس، مقدار جاذب، غلظت سرب، قدرت یونی و اثردما برروی جذب بروش ناپیوسته بررسی شد . بهترین شرایط در pH~ 7 ، مقدار جاذب 04/0 گرم ، زمان تماس 45 دقیقه، غلظت اولیه ppm 30 تعیین گردید که منجر به بیشترین جذب سرب با درصد حذف 7/99 گردید. با استفاده از ثابتهای تعادلی بدست آمده در دماهای مختلف، پارامترهای ترمودینامیکی محاسبه شدندکه بیانگر خودبخودی و گرمازا بودن فرآیند جذب سرب می باشد. حداکثر ظرفیت جذب با استفاده ازمعادله لانگمویر47/85 میلی گرم بر گرم محاسبه شد. داده های سینتیکی با شبه مرتبه دوم مطابقت داشتند.
کلیدواژهها
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