کاربرد کامپوزیت پلی‌اکریلیک اسید ـ بنتونیت برای جذب کروم از محلول های آبی

نوع مقاله: علمی-پژوهشی

نویسندگان

گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، صندوق پستی 83111 ـ 84156، اصفهان، ایران

چکیده

استفاده از کامپوزیت­ های پلیمر ـ رس به عنوان جاذب در آلودگی­ زدایی آب­های آلوده، به تازگی موضوع بسیاری از این پژوهش ­ها قرار گرفته است. در این پژوهش، کارایی کامپوزیت پلی­اکریلیک اسید ـ بنتونیت برای جذب کروم مورد بررسی قرار گرفت. رفتار جذبی کامپوزیت برای یون­های کروم از محلول­های آبی در شرایط گوناگون از جمله غلظت اولیه کروم (500 -5 میلی ­گرم بر لیتر) و زمان تماس (1440 -30 دقیقه) مطالعه شد. مدل­ های هم­دمای لانگمویر و فروندلیچ بر داده­های تعادلی آزمایش برازش داده شد که مدل لانگمویر داده­های تعادلی را بهتر توصیف نمود (994/0=2R). بیش­ترین ظرفیت پلی اکریلیک اسید ـ بنتونیت برای جذب یون­های کروم در دمای 25 درجه سلسیوس، mg/g 55/29 به ­دست آمد که بسیار بیش­ تر از مقدار آن برای بنتونیت طبیعی (mg/g 3/1) بود. کارایی جذب کروم توسط کامپوزیت در غلظت اولیه mg/L 50، بیش از 85% و در مدت زمان حدود 30 دقیقه به­دست آمد. سینتیک جذب به خوبی از مدل ­های شبه مرتبه اول و شبه مرتبه دوم تبعیت نمود. نتیجه ­ها نشان می­دهد که کامپوزیت پلی­اکریلیک اسید ـ بنتونیت پتانسیل زیادی برای جذب یون ­های کروم از محلول­های آبی دارا می ­باشد.

کلیدواژه‌ها

موضوعات


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