مطالعه سینتیکی و ترمودینامیکی جذب یون کروم ) (III از فاز آبی توسط نانولوله های کربنی عامل‌دار شده

نوع مقاله : علمی-پژوهشی

نویسندگان

1 گروه شیمی، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه شیمی، دانشگاه آزاد اسلامی، واحد تهران مرکزی، تهران، ایران

چکیده

در این پژوهش در گام نخست، نانولوله‌های کربنی چند دیواره (MWCNTs) عامل‌دار شد و سپس مورد مشخصه ‌یابی قرار گرفت. در فرایند مشخصه یابی از اسپکتروسکوپی فروسرخ تبدیل فوریه (FT-IR)، پراش پودری پرتو X (XRD)، میکروسکوپ الکترونی روبشی (SEM)، آنالیز بت. امت، تلر. بارت.جوینر.هالندا (BET/BJH) و آنالیز اندازه ذره‌ها (PSA) استفاده شد. در گام بعدی از نانولوله‌های کربنی عامل‌دار شده (FMWCNTs) برای حذف یون‌های آلاینده از محیط‌های آبی استفاده شد. اثر عامل‌های مؤثر بر بازدهی فرایند جذب، مانند غلظت اولیه جذب‌شونده، C0، مقدار جاذب (W)، pH، زمان تماس جذب‌شونده با جاذب و دما مطالعه شد و مقدار بهینه هر یک از آن‌ها تعیین شد. نتیجه‌های به‌دست آمده از بستگی ظرفیت جذب تعادلی، qe، با غلظت اولیه جذب‌شونده در شرایطی که سایر عامل‌های مؤثر بر جذب در مقدار بهینه خود ثابت بودند. با چند هم‌دمای جذب مقایسه شد و معلوم شد که هم‌دمای لانگمویر، تمکین و فروندلیش سازگاری خوبی با نتیجه‌های این پژوهش دارند. ولی سازگاری هم‌دمای فروندلیش بهتر است. بررسی‌های سینتیکی فرایند جذب سطحی مورد مطالعه نشان داد که معادله سینتیکی شبه مرتبه اول با نتیجه‌های تجربی سازگاری خوبی را دارد و در همان حال مدل نفوذ درون مولکولی نیز می‌تواند با نتیجه‌های سینتیکی این پژوهش سازگار باشد. ترمودینامیک جذب نیز با در نظر گرفتن چگونگی بستگی، qe، با دما در شرایطی که سایر عامل‌ها بر روی مقدارهای بهینه خود ثابت نگهداشته شدند، مورد مطالعه قرار گر فت و توابع ترمودینامیکی جذب محاسبه شدند. نتیجه‌ها نشان داد، که فرایند جذب سطحی مورد مطالعه در گستره دمایی به کار رفته خودبه خودی ( G0ad<0) یعنی اگزرگونیک است و گرمازا می­باشد  ( H0ad< 0)و با کاهش در بی نظمی سامانه جذب‌شونده و جاذب همراه است ( S0ad<0). باتوجه به مقدار H0ad می‌توان پیشنهاد نمود که جذب سطحی مورد مطالعه تا حدودی می‌تواند در ردیف جذب فیزیکی قلمداد شود.

کلیدواژه‌ها

موضوعات

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