ترمودینامیک، ایزوترم و سینتیک جذب مواد رنگزای کاتیونی با استفاده از اکسیدهای گرافن سنتز شده مختلف

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه شیمی، دانشگاه پیام نور، تهران، ایران، صندوق‌پستی: ۴۶۹۷ -۱۹۳۹۵.

2 دانشیار، گروه شیمی، دانشگاه آزاد اسلامی واحد شهرقدس، تهران، ایران، صندوق‌پستی: 37541-374.

3 استاد، گروه شیمی، دانشگاه بیرجند، بیرجند، ایران، صندوق‌پستی: ۶۱۵-۹۷۱۷۵.

4 استاد، گروه شیمی، دانشگاه پیام نور، تهران، ایران، صندوق‌پستی: ۴۶۹۷ -۱۹۳۹۵.

5 استادیار، گروه شیمی، دانشگاه پیام نور، تهران، ایران، صندوق‌پستی: ۴۶۹۷ -۱۹۳۹۵.

چکیده

در این تحقیق، اکسیدهای گرافن مختلف GO1.5)، GO3، GO4.5 و GO6) سنتز و شناسایی شدند. مواد رنگزای کاتیونی شامل متیلن آبی و بلور بنفش به عنوان آلاینده آلی استفاده شد. مقدار ماده رنگزای جذب شده روی جاذب‌های سنتز شده با افزایش غلظت آلاینده افزایش می‌یابد. نتایج نشان داد که ظرفیت جذب آلاینده با افزایش مقدار جاذب افزایش و سپس تا حدودی کاهش می‌یابد. با افزایش مقدار جاذب، مکان‌های فعال در دسترس‌تر خواهند بود. ذرات جاذب در مقادیر بالاتر از مقدار بهینه جاذب کلوخه‌ای می‌شوند. بنابراین میزان حذف مواد رنگزا کاهش می‌یابد. داده‌‌های ترمودینامیکی جذب نشان داد که ΔG منفی حذف بلور بنفش و متیلن آبی توسط جاذب‌‌های سنتز شده، جذب فیزیکی و خودبه‌خودی را ارائه می‌دهد. همچنین مقادیر مثبت ΔH و ΔS خواص گرماگیر جذب و افزایش بی‌نظمی ماده رنگزا را در سطح جاذب نشان داد. نتایج ایزوترم نشان داد که حذف متیلن آبی و بلور بنفش از مدل ایزوترم لانگمویر تبعیت می‌کند. به این معنی که فرآیند جذب در نواحی همگن خاصی از جاذب انجام شده است. داده‌ها نشان دادند که جذب متیلن آبی و بلور بنفش از سینتیک شبه مرتبه دوم پیروی می‌کند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Adsorption Thermodynamics, Isotherm and Kinetics of Cationic Dyes Using Different Synthesized Graphene Oxides

نویسندگان [English]

  • Narges Behzad 1
  • Omid Moradi 2
  • Heydar Raeisi 3
  • Mohammad Hakimi 4
  • Shahla Mozafari 5
1 Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
2 Department of Chemistry, Shahr-e-Qods Branch, Islamic Azad University, P. O. Box: 375-37541, Tehran, Iran.
3 Chemistry department, University of Birjand, P. O. Box: 97175-615, Birjand, Iran
4 Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
5 Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran.
چکیده [English]

Different graphene oxides (GO) (GO1.5, GO3, GO4.5, and GO6) were synthesized and characterized. Cationic dyes, including Methylene Blue (MB) and Crystal Violet (CV) were used as organic pollutants. The amount of dye adsorbed on the synthesized adsorbents increases by increasing the contaminant concentration. The results indicated that contaminant adsorption capacity is enhanced by enhancing the adsorbent dose and then decreases to some extent. As the adsorbent dose increases, the active sites will be more accessible. The adsorbent particles are agglomerated at values ​​higher than the optimal value of the absorbent. Thus, the amount of dye removal is reduced. The adsorption thermodynamic data presented that the negative ΔG of CV and MB removal by the synthesized adsorbents presented physical and spontaneous adsorption. Also, the positive values of ΔH and ΔS showed the endothermic properties of adsorption and the increase of dye irregularity on the adsorbent surface. The isotherm data indicated that MB and CV removal obeyed the Langmuir isotherm model. It means the adsorption process was carried out in specific homogeneous areas of the adsorbent. The results showed that MB and CV adsorption followed PSO kinetics

کلیدواژه‌ها [English]

  • Graphene oxide synthesis
  • Cationic dyes removal
  • Adsorption thermodynamics
  • Adsorption isotherm
  • Adsorption kinetics
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