سنتز و اصلاح سطح سیلیس نانو حفره با گروه‌های مونو و دندریمرآمین به‌منظور حذف رنگ متیلن‌بلو از پساب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

2 استادیار، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

3 دانشیار، دانشکده شیمی، پردیس علوم، دانشگاه تهران

چکیده

بسیاری از رنگ‌های آلی مانند رنگ کاتیونی متیلن‌بلو به‌دلیل ساختار پیچیده آروماتیک و حلالیت بالا در آب، سمی، سرطانزا و غیر قابل تجزیه‌ زیستی می‌باشند، لذا حذف آنها از پساب ضروری است. در این تحقیق، سیلیس نانوحفره SBA-15  به‌روش هیدروترمال سنتز و سپس به‌روش پساسنتزی با گروه تک‌شاخه آمینی (NH2-SBA-15) و دندریمرآمینی ‌(MDA-SBA-15) عامل‌دار شد. اثر اصلاح سطح بر روی کارایی جذب رنگ متیلن‌بلو در سیستم ناپیوسته بررسی شد. ویژگی نانو جاذب‌های سنتز شده با استفاده از آنالیزهای XRD، FT-IR، SEM و BET انجام شد. نتایج نشان داد که در شرایط یکسان، کارایی حذف متیلن‌بلو با استفاده از نانو جاذب MDA-SBA-15، 37 میلی‌گرم بر گرم است که به‌ترتیب 6/2 و 3/3 برابر بیشتر از این کارایی برای جاذب‌های NH2-SBA-15 و SBA-15 است. فرایند جذب با استفاده از چهار مدل‌ ایزوترمی لانگمیر، فروندلیچ، تمکین و دوبینین-رادکوویچ مدل‌سازی شد. همبستگی زیاد داده‌ها با مدل جذب لانگمیر بیانگر جذب تک لایه‌ای متیلن‌بلو بر روی MDA-SBA-15 است. پارامترهای حاصل از ایزوترم تمکین نشان داد که روند جذب با MDA-SBA-15 گرمازا است. کارایی بیش از 90 درصدی MDA-SBA-15 نسبت‌ به دو نانو جاذب دیگر در حذف رنگ متیلن‌بلو از محیط آبی نشان داد که می‌توان از آن به‌عنوان یک جاذب موثر در فرایند تصفیه استفاده نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Functionalized Nanoporous Silica by Mono and Dendrimeramine in Methylene Blue Removal from Wastewater

نویسندگان [English]

  • Zeinab Salahshoor 1
  • Afsaneh Shahbazi 2
  • Alireza Badiei 3
1 MSc Student, Environmental Sciences Research Center, Shahid Beheshti University, Tehran
2 Ass. Prof., Environmental Sciences Research Institute, Shahid Beheshti University, Tehran
3 Assoc. Prof., Dept of Chemistry, Sciences Campus, Tehran University, Tehran
چکیده [English]

Many organic dyes such as Methylene Blue are toxic, carcinogenic, and non-biodegradable due to their aromatic complex structure and high solubility in water. It is, therefore, essential to remove them from effluents discharged into the environment. In this study, SBA-15 mesoporous silica was synthesized by the hydrothermal method and later functionalized with mono- amine (NH2-SBA-15) and dendrimer amine (MDA-SBA-15). Then, the effect of surface modification on adsorption efficiency of Methylene Blue was examined in a batch system. The prepared materials were characterized by XRD, FT-IR, SEM, and BET analyses. The results showed that, under identical conditions, removal efficiency with MDA-SBA-15 was 2.6 and 3.3 times higher than those achieved with NH2-SBA-15 and SBA-15, respectively. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Tempkin, and Dubnin–Radushkevich isotherms. Equilibrium data was best described by the Langmuir isotherm models, indicating a monolayer adsorption process. Tempkin isotherm parameters indicated that the adsorption process by MDA-SBA-15 was exothermic. The removal efficiency of Methylene Blue from aqueous solutions by MDA-SBA-15 was more than 90%, which was higher than the efficiency achieved by other nano-sorbents. This showed that MDA-SBA-15 could be used as an effective adsorbent in wastewater treatment.

کلیدواژه‌ها [English]

  • Adsorption
  • Mesoporous silica
  • SBA-15
  • NH2-SBA-15
  • MDA-SBA-15
  • Methylene blue
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