بهینه سازی فرآیند جذب جیوه از محیط آبی به وسیله کامپوزیت پلی پیرول بر روی کلینوپتیلولیت با روش تاگوچی

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، دانشکده فناوری های نوین مهندسی، دانشگاه تخصصی فناوری های نوین آمل، آمل، ایران

10.22034/jewe.2020.260842.1480

چکیده

انتشار فلزات سنگین در محیط‌زیست به­دلیل صنعتی­شدن و گسترش شهرنشینی مشکلات بزرگی در سراسر جهان به­همراه داشته است. هدف از این مطالعه بررسی امکان حذف جیوه (Hg(II)) از محلول آبی در فرآیند جذب ناپیوسته با استفاده از نانوکامپوزیت سنتز شده پلی پیرول/کلینوپتیلولیت (PPy/Clinoptilolite) بود. ریخت‌شناسی و گروه‌های عاملی نانوکامپوزیت با استفاده از اسکن میکروسکوپ الکترونی (SEM)، اسپکتروسکوپ مادون‌قرمز فوریه (FTIR) و BET بررسی شد. از جاذب تهیه‌شده برای حذف جیوه از محلول آبی استفاده شد. آزمون‌ها و نتایج بهینه‌سازی حاصل از آن‌ها بر اساس طراحی آزمایش‌ها در سه سطح از متغیرها با استفاده از روش‌تاگوچی انجام شد. نتایج نشان داد که در آزمون‌های حذف جیوه از محلول آبی، pH محلول بیش‌ترین تأثیر را بر روی راندمان حذف جیوه داشته و در محیط بازی، تأثیر حذف جیوه بیش­تر از شرایط اسیدی و خنثی محلول می‌باشد. بیش­ترین راندمان حذف جیوه (حدود 95%) از محلول آبی با غلظت mg/l 50، در مقادیر سطح سوم متغیرهای عملیاتی pH، زمان تماس و جرم جاذب به­دست آمد که به­ترتیب 10، min30 و g 35/0 بد. غلظت یون‌های جیوه در محلول آبی با استفاده از دستگاه جذب اتمی اندازه‌گیری شد. مطالعه مدل‌های ایزوترم جذب توسط چهار ایزوترم لانگمیر، فرندلیچ، دابینین رادشکویچ و تمکین انجام شد. نتایج نشان داد بیش­ترین ظرفیت جذب جیوه توسط کامپوزیت پلیمری mg/g 37/42 می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Optimization of Mercury Adsorption Process from Aqueous Solutions using Polypyrrol/clinoptilolite Composites with Taguchi Method

نویسنده [English]

  • Hossein Esfandian
Assoc. Professor, Department of Chemical Engineering, Faculty of Engineering Technologies, Amol University of Special Modern Technologies, Amol, Iran
چکیده [English]

The release of heavy metals into the environment has caused major problems around the world due to industrialization and urbanization. The aim of this study was to examine the possibility of mercury (Hg(II)) removal from aqueous solution in batch process using synthesized functional polypyrrol/ clinoptilolite nanocomposite. The morphology and functional groups of the nanocomposites were characterized using scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR) and BET. The adsorbent modified was used to remove mercury from aqueous solution. The experiments and optimization were performed based on experimental design with three levels of variables using Taguchi method. Results revealed that in mercury sorption tests in aqueous solution, pH solution has the greatest impact on the removal efficiency of mercury and mercury sorption in the alkaline conditions is more than acidic and neutral solution. The highest removal efficiency of mercury (approximately 95%) from aqueous solution with a concentration of 50 mg/l was obtained in the values ​​of the third level of the operational variables pH, contact time, and adsorbent mass, which were 10, 30 min and 0.35 g, respectively. The concentration of mercury ions in aqueous solution was measured using an atomic absorption spectrometer. The study of adsorption isotherm models was performed by four isotherms of Langmuir, Friendlich, Dabinin Radskovich, and Tamkin. The results showed that the maximum adsorption capacity of mercury by polymer composite was 42.37 mg/g.

کلیدواژه‌ها [English]

  • Adsorption
  • Polypyrrol composite
  • Clinoptilolite
  • Experimental Design
  • Taguchi method
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