نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 بخش شیمی، دانشگاه پیام نور، کرمان، ایران
2 بخش شیمی، دانشگاه پیام نور، تهران، ایران
چکیده
پودر پوست نارگیل (CPW) بطور شیمیایی با نانوذرات سیلیس اصلاح و نانو کامپوزیت SiO2/CPW تهیه گردید. نانو کامپوزیت جدید, توسط تکنیکهای FT-IR , SEM وDLS شناسایی شد. جذب کادمیم برروی SiO2/CPW به صورت ناپیوسته و بعنوان تابعی ازpH , زمان تماس, مقدار جاذب, غلظت اولیهی کادمیم و دما بررسی گردید. بیشترین حذف یونهای کادمیم در5/6 pH= و مقدار جاذب1/0 گرم بود. آزمایشات نشان دادکه فرایند جذب سریع بوده و 5/74 درصد از کل کادمیم در 5 دقیقه اول حذف میگردد. جذب کادمیم توسط جاذب جدید از معادله شبه مرتبه اول پیروی کرد. با استفاده از ثابتهای تعادلی غلظت در دماهای مختلف پارامترهای ترمودینامیکی محاسبه شدند. نتایج, دلالت بر جذب کادمیم بصورت خود به خودی و گرماگیر داشت. جاذب پیشنهادی پتانسیل خوبی در حذف کادمیم از آب و پسابهای صنعتی دارد.
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