بررسی جذب فنل از محلول‌های آبی با استفاده از کربن هسته انار

نوع مقاله : علمی-پژوهشی

نویسندگان

1 گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه گیلان، رشت، ایران

2 گروه شیمی، دانشکده علوم پایه، دانشگاه گیلان، رشت، ایران

چکیده

این پژوهش با هدف بررسی کارایی کربن هسته انار در جذب فنل از محلول‌های آبی انجام شده است. بدین منظور نمونه پساب دارای فنل به‌طور مصنوعی در مقیاس آزمایشگاهی در آب یون زدایی ‌شده و در یک راکتور ناپیوسته، اثر عامل ­های مؤثر مانندpH اولیه محلول، مقدار جاذب، زمان تماس، غلظت اولیه فنل و اثر دما بررسی‌شد. غلظت فنل باقی‌مانده در نمونه‌های مورد آزمایش با استفاده از روش اسپکتروفتومتری در طول‌موج 270 نانومتر تعیین شد و برای تجزیه‌وتحلیل داده‌ها نرم‌افزار EXCEL به‌کار برده شد. به‌منظور مطالعه سینتیک جذب سطحی، سینتیک شبه درجه اول، شبه درجه دوم و سینتیک نفوذ درون‌ذره‌ای موردمطالعه قرار گرفت که نتیجه­ ها نشان‌دهنده تطابق بیش ­تر سینتیک شبه درجه دوم با داده‌های تجربی است. همچنین تطابق داده‌های تجربی با هم ­دما‌های لانگمویر و فروندلیچ بررسی شد که مقدار ضریب همبستگی (99/0R2=) نشان‌دهنده تبعیت جذب فنل از هم ­دمای فروندلیچ است. پارامترهای ترمودینامیکی مانند انرژی آزاد گیبس استانداردΔGο، آنتالپی استاندارد HοΔ و آنتروپی استاندارد ΔSο  در دماهای گوناگون محاسبه‌شد. منفی بودن تغییرهای انرژی آزاد گیبس و آنتالپی نشان‌دهنده خود به خودی و گرمازا بودن فرایند جذب است. با توجه به نتیجه­ های به‌دست‌آمده، میزان جذب فنل توسط کربن هسته انار با افزایش زمان تماس و گرم جاذب افزایش می‌یابد و با افزایش pH، غلظت اولیه فنل و دما کاهش می‌یابد. بیش­ ترین درصد جذب فنل توسط کربن هسته انار برابر 94‌% در pH بهینه 2، مقدار جاذب g 5/1 در غلظت اولیه فنل معادل  mg/L100 و زمان تماس 30 دقیقه به‌دست‌آمد. بر اساس نتیجه ­های به دست آمده مشخص شد که کربن هسته انار یک جاذب ارزان‌قیمت و در دسترس محسوب شده و دارای پتانسیل بالا، در جذب فنل از محلول‌های آبی است.

کلیدواژه‌ها

موضوعات

مراجع

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