مدلسازی و بهینه‌سازی جذب رنگزای کاتیونی کریستال بنفش در راکتور ناپیوسته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فناوری محیط زیست، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران، ایران

2 عضو هیات علمی دانشگاه شهید بهشتی

چکیده

نانوصفحات گرافن ا کساید به روش اصالح شده هامر سنتز و با استفاده از آنالیزهایمیکروسکوپ الکترونی روبشی (SEM ،)طیف سنجی پراش پرتو ایکس (XRD )و طیف سنجی تبدیل فوریه مادون قرمز (FTIR )شناسایی شد. روش نانوصفحات گرافن ا کساید استفاده شد. فا کتورهای موثر بر فرآیند جذب شامل pH( 4-9 ،)دوز جاذب )0/4-0/05 گرم بر ِ آماری پاسخ سطحی (RSM )برای بهینهسازی فا کتورهای موثر بر فرآیند جذب رنگزای کاتیونی کریستال بنفش بوسیله لیتر(، غلظت اولیه رنگزا )400-50 میلیگرم بر لیتر( و دما )40-10 درجه سلسیوس( در را کتور جذب ناپیوسته مطالعه شدند. براساس پیشبینی مدل رگرسیون چندجملهای، ظرفیت جذب گرافنا کساید و راندمان حذف کریستال بنفش در شرایط بهینه )4/7pH ،=دوز جاذب 0/19 گرم برلیتر، غلظت اولیه 100 میلیگرم بر لیتر و دمای 30/4 درجه سلسیوس( به ترتیب 474 میلیگرم بر گرم و 90 درصد به دست آمد. از بین عوامل موثر ، غلظت اولیه رنگزا و دوز جاذب به ترتیب با 51/6 و 41/7 درصد، بیشترین اثرگذاری را بر فرآیند جذب نشان دادند. سینتیک فرآیند جذب با استفاده از مدلهای سینتیکی شبه مرتبه اول، شبه مرتبه دوم و نفوذ درونذرهای و ایزوترم جذب با استفاده از مدلهای ایزوترمی النگمیر و فرندلیچ مدلسازی و تحلیل شد. نتایج به دست آمده همبستگی بسیار باالی سینتیک جذب با مدل شبه مرتبه دوم و ایزوترم جذب با مدل النگمیر را نشان داد. مطالعات ترمودینامیکی نشان داد که فرآیند جذب گرما گیر و خودبه خودی فرآیند جذب بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Adsorption modeling and optimization of crystal violet a cationic dye in batch reactor

نویسندگان [English]

  • Habib Koulivand 1
  • afsaneh shahbazi 2
1 deportment of environmental technology, environmental science research institute, shahid beheshti university, Tehran, Iran
2 Prof., Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran
چکیده [English]

Graphene oxide nano-sheets were synthesized using modified Hummer’s method and characterized using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Fourier Transform Infra-Red (FTIR) analyses. Response surface methodology (RSM) was used to optimize the effects of the effective factors including pH (4-9), adsorbent dosage (0.05-0.4 g/L), initial dye concentration (50-400 mg/L), and temperature (10-40 C°) in batch adsorption reactor. The adsorption capacity of graphene oxide and removal percentage of crystal violet in the optimum condition (pH of 7.4, the adsorbent dosage of 0.19 g/L, the initial concentration of 100 mg/L, and temperature of 30.4 C°) were predicted by the polynomial regression model to be 474 mg/g and 90%, respectively. Dye initial concentration and the adsorbent dosage with 51.6 and 41.7% respectively, showed the most percentage of contribution among the effective factors. Adsorption kinetic was investigated using pseudo-first order, pseudo-second order, and intraparticle diffusion kinetic models. Adsorption isotherm also was studied using Freundlich and Langmuir isotherm models. Results demonstrated the high correlation of adsorption kinetic and isotherm with pseudo-second order and Langmuir models respectively. In addition, the thermodynamic study indicated the endothermic and spontaneous nature of adsorption.

کلیدواژه‌ها [English]

  • Graphene oxide
  • batch adsorption
  • crystal violet
  • optimization
  • RSM

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 3
مرداد و شهریور 1398
صفحه 575-584

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