عوامل مؤثر بر تشکیل دانه‌های بر پایه زئولیت طبیعی در جذب رنگینه‌های کاتیونی از آب‌های آلوده

نوع مقاله : پژوهشی

نویسندگان

تبریز، دانشگاه تبریز، دانشکده مهندسی شیمی و نفت، صندوق پستی 16471-51666

چکیده

فرضیه: رنگینه‌های آبی متیلن و بلور بنفش از رنگینه‌های استفاده‌شده در برخی صنایع مانند تولید پارچه، ابریشم و چوب هستند. تجمع رنگینه‌های کاتیونی در منابع آبی برای انسان‌ها، حیوانات و محیط‌زیست مضر است. بنابراین، حذف آن‌‌ها از پساب‌های صنایع رنگرزی لازم است. از میان روش‌های عمده‌ تصفیه آب و فاضلاب روش جذب به‌دلیل سادگی طراحی، ارزانی، مؤثربودن و کارایی زیاد به‌طور گسترده در تصفیه فاضلاب‌ استفاده می‌شود. با توجه به مطالعات انجام‌شده، زئولیت‌های اصلاح‌شده با نانوذرات آهن ظرفیت جذب زیادی در حذف رنگینه نشان می‌دهند. با وجود این، به‌دلیل مشکلاتی از قبیل کاهش فشار و مشکلات جداسازی جاذب‌های پودری از آب، آماده‌سازی و تهیه‌ دانه روشی مؤثر و مناسب برای رفع نقاط ضعف و کارایی مناسب این جاذب‌ها در تصفیه آب و فاضلاب در مقیاس صنعتی است.
روش‌ها: برای حل مشکلات استفاده از جاذب‌ها به‌شکل پودر، از روش ژل‌شدن یونی برای تهیه جاذب دانه‌ای بر پایه زئولیت طبیعی کلینوپتیلولیت اصلاح‌شده با نانوذرات Fe3O4 استفاده شد. برای تهیه دانه‌هایی با شکل ظاهری مناسب و درصد جذب زیاد اثر عوامل مختلف از قبیل pH اولیه محلول، نوع و غلظت محلول اتصال‌دهنده عرضی و نسبت اولیه آلژینات به نانوکامپوزیت بررسی شد. همچنین، ویژگی دانه‌های سنتزشده با آزمون‌های XRD، وSEM-EDX و BET بررسی شد.
یافته‌ها: نتایج حاصل بی‌اثر‌بودن pH و بهینه‌بودن محلول آهن (III) کلرید با غلظت (w/v) %2 و نسبت اولیه 4:1 از آلژینات به نانوکامپوزیت را نشان داد. همچنین، بیشترین ظرفیت جذب به‌دست‌آمده از هم‌دمای Langmuir، برای رنگینه‌های آبی متیلن و بلور بنفش با دانه‌های تهیه‌شده به‌ترتیب 12.484 و 11.904mg/g تعیین شد که نشان‌دهنده قابلیت زیاد دانه‌های تهیه‌شده در حذف مواد رنگینه است.

کلیدواژه‌ها

عنوان مقاله [English]

Effective Parameters on the Formation of Natural Zeolite-Based Granules to Remove Cationic Dyes from Contaminated Water

نویسندگان [English]

  • Maryam Noori
  • Maryam Tahmasebpoor
  • Leila Khazini
Faculty of Chemical and Petroleum Engineering, University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran
چکیده [English]

Hypothesis: Methylene blue and crys‌tal violet dyes are the mos‌t widely used dyes in some indus‌tries such as textiles, silk, and wood. Accumulation of cationic dyes in water resources is harmful to humans, animals, and the environment, so their removal from the effluents of the dyeing indus‌try is essential. Among all the treatment methods, adsorption is one of the mos‌t attractive routes for the treatment of polluted water due to its low cos‌t and simplicity of design. According to the s‌tudies, it can be seen that zeolites modified with iron nanoparticles show a high adsorption capacity in the removal of dyes. However, the use of adsorbents in the form of fine powders is s‌till difficult and their use in continuous sys‌tems is limited due to the cracking and the pressure drop.
Methods: To solve the problems of adsorbents in powder form, the ionic gelation method was used to prepare a granular adsorbent based on natural zeolite clinoptilolite modified with Fe3O4 nanoparticles. In order to prepare granules with suitable appearance and high adsorption percentage, the effect of various parameters such as initial pH of the solution, type and concentration of the crosslinking solution and initial ratio of alginate to nanocomposite was inves‌tigated. The synthesized granules were inves‌tigated by XRD, SEM-EDX and BET analysis.
Findings: The results showed that the pH was ineffective and the iron (III) chloride solution was optimal with a concentration of (2 w/v%) and an initial ratio of 1:4 alginate to nanocomposite. The maximum adsorption capacity of the prepared granules towards methylene blue and crys‌tal violet adsorption was determined as 12.484 mg/g and 11.904 mg/g by Langmuir isotherm, respectively, which indicated to a high ability of the prepared granules to remove these cationic dyes.

کلیدواژه‌ها [English]

  • adsorption
  • granulation
  • ionic gelation method
  • natural clinoptilolite
  • dye

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مجله علوم و تکنولوژی پلیمر
دوره 34، شماره 3 - شماره پیاپی 173
مرداد و شهریور 1400
صفحه 267-279

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