سنتز و اصلاح سطح ترکیب سیلیکاتی میان حفره شش وجهی HMS با کیتوزان به‌منظور حذف رنگزای زرد مستقیم 86 از محلول آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد مهندسی شیمی، گروه مهندسی شیمی، واحد قائمشهر، دانشگاه آزاد اسلامی، قائمشهر، ایران

2 استادیار مهندسی شیمی، گروه مهندسی شیمی، واحد قائمشهر، دانشگاه آزاد اسلامی، قائمشهر، ایران

3 استادیار مهندسی شیمی، دانشکده مهندسی شیمی، دانشگاه علم و فناوری مازندران، بهشهر، ایران

چکیده

بسیاری از رنگ‌ها به‌علت ترکیب پیچیده آروماتیک و انحلال زیاد در آب، سمّی، سرطان‌زا و زیست تخریب ناپذیرند، بنابراین حذف آنها از پساب‌ حائز اهمیت است. در این پژوهش، سیلیکات میان حفره با ساختار شش وجهی منظم به‌روش سل-ژل سنتز شد و پس از اصلاح سطح آن با کیتوزان (Ch-HMS)، به‌عنوان جاذب برای حذف رنگ زرد مستقیم 86 استفاده شد. برای بررسی جاذب سنتزشده، از روش‌های SEM،FTIR ، XRD و BET استفاده شد. تأثیر پارامترهایی مانند pH، مقدار جاذب و زمان تماس بر راندمان حذف رنگ بررسی شد. نتایج نشان داد که حدود 92 درصد رنگ با استفاده از 075/0 گرم کامپوزیت در pH برابر 2 و در زمان تماس 60 دقیقه حذف شد. داده‌های تعادلی جذب با استفاده از هم‌دماهای لانگمیر، فروندلیچ، تمکین و الوویچ با کمک رگرسیون خطی مدل‌سازی شدند. هم‌دمای لانگمیر بهترین تطابق را با داده‌های آزمایشگاهی با ظرفیت 71/43 میلی‌گرم بر گرم داشت. در این پژوهش مشخص شد که اصلاح سطح HMS با کیتوزان و سنتز نانوکامپوزیت، موجب افزایش ظرفیت جذب رنگ بر روی آن می‌شود و این جاذب می‌تواند به‌عنوان یک جاذب کارآمد و قوی برای حذف آلاینده‌ها از محیط‌های آبی استفاده شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Synthesis and Surface Modification of Hexagonal Mesoporous Silicate–HMS using Chitosan for the Adsorption of DY86 from Aqueous Solution

نویسندگان [English]

  • Mahsa Aghapour 1
  • Ehsan Binaeian 2
  • Arash Kamran Pirzaman 3
1 MSc of Chemical Engineering, Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
2 Assist. Prof., Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
3 Assist. prof., Department of Chemical Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran
چکیده [English]

Many types of dyes are toxic, carcinogenic, non-biodegradable due to their complex aromatic structures and their water solubility and accordingly, they should be removed from wastewaters. In the present research, hexagonal mesoporous silicate HMS was synthesized by sol-gel method and after modification by natural polymer chitosan (Ch-HMS), it was applied for the removal of direct yellow 86 from aqueous media. The characterization of synthesized HMS and chitosan modified HMS were analyzed by some basic analyses such as SEM, FTIR, XRD and BET. The effects of pH, adsorbent dosage and contact time on the removal of direct yellow 86 were investigated. The results revealed that the maximum adsorption of dye was about 92% which was obtained by 0.075 g of Ch-HMS composite at the pH of 2 and for 60 min contact time. The equilibrium data of experiments were studied by Langmuir, Freundlich, Elovich and Temkin isotherm models using linear regression. The Langmuir model with the maximum adsorption capacity of 71.43 mg/g was the predominant model. Kinetic study was also performed using pseudo first and pseudo second order kinetic models where the second order model had the best agreement with the experimental data. The experimental data showed that surface modification of HMS by chitosan and formation of Ch-HMS nanocomposite enhanced the adsorption capacity of HMS and changed it into a useful and powerful adsorbent for the removal of pollutants from aqueous solutions.

کلیدواژه‌ها [English]

  • Hexagonal Mesoporous Silicate (HMS)
  • Chitosan
  • Adsorption
  • Isotherm
  • Direct Yellow 86

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