سنتز و تعیین مشخصات جاذب های CuO، ZnO و CeO2 بر پایه سیلیکای مستخرج از خاکستر سبوس برنج و ارزیابی عملکرد آن در گوگردزدایی از سوخت مدل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فرایند-دانشگاه تربیت مدرس دانشکده مهندسی شیمی

2 دانشگاه بین المللی امام خمینی، مرکز آموزش عالی فنی و مهندسی بویین زهرا

3 دانشگاه تربیت مدرس دانشکده شیمی

10.22034/jfnc.2022.299068.1286

چکیده

در این پژوهش در ابتدا سیلیکای آمورف خالص از خاکستر سبوس برنج به طریق استخراج اسیدی سپس کلسیناسیون و استخراج قلیایی و درنهایت تیتراسیون توسط اسید استخراج شد. در ادامه، سنتز جاذب‌ها از طریق بارگذاری مس، روی و سریم به میزان 13% وزنی فلز به روش تلقیح بر روی پایه سیلیکا انجام شد. در نهایت، عملکرد جاذب‌های سنتز شده در فرایند گوگردزدایی جذبی جهت حذف ماده 4و6-دی‌متیل‌دی‌بنزوتیوفن از سوخت مدل بررسی شد. برای بررسی خواص فیزیکی- شیمیایی جاذب‌های سنتز شده از آنالیزهای BET و FESEM که مجهز به EDX است، استفاده‌شده است. ایزوترم جذب و واجذب نیتروژن برای نمونه‌ها نشان داد که حفره‌ها در محدوده مزو(nm50-2) قرار دارند. بیشترین میزان ظرفیت جذب در غلظت ppm 500 برای جاذب بارگذاری شده توسط مس برابر mg/g 23/7 حاصل شد. همچنین با بررسی ایزوترم‌های تعادلی لانگمویر، فرندلیچ و دوبینین- رادوشکویچ، ایزوترم لانگمویر بیشترین تطابق را با داده‌های تجربی داشت. طبق ایزوترم‌ دوبینین- رادوشکویچ ثابت شد، مکانیزم غالب در جذب سطحی در این پژوهش، فیزیکی است. جهت بررسی سینتیک جذب معادلات شبه درجه اول و شبه درجه دوم نیز بررسی شدند. سینتیک شبه درجه دوم با R2 برابر 0/99 با داده‌های تجربی برازش شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Synthesis and characterization of CuO, ZnO and CeO2 adsorbents based on silica derived from Rice husk ash and evaluation of its performance in the desulfurization process of model fuel

نویسندگان [English]

  • Amir Rostampoor 1
  • Reza Khoshbin 2
  • Ramin Karimzadeh 3
1 Process Department - Tarbiat Modares University, Faculty of Chemical Engineering
2 Buin Zahra Higher Education Center of Engineering and Technology, Imam Khomeini International University ,
3 Tarbiat Modares University
چکیده [English]

In this study, the aim is to extract pure amorphous silica from rice husk ash by acid leaching, then calcination and base leaching, and finally titration by acid. Then, the synthesis of adsorbents was performed through loading of copper, zinc and cerium at the rate of 13% by weight of metal by impregnation method on silica support. Finally, the performance of the synthesized adsorbents in the adsorptive desulfurization process was investigated to remove 4, 6-dimethyldibenzothiophene from the model fuel. Nitrogen adsorption - desorption isotherms for the samples showed that the pores are in the mesopore range. The highest adsorption capacity was obtained at a concentration of 500 ppm for CuO/SiO2 adsorbent equal to 23.7 mg/g. Also, by examining the Langmuir, Freundlich and Dubinin-Radushkevich equilibrium isotherms, the Langmuir isotherm was most consistent with the experimental data. Also, according to Dubinin-Radushkevich isotherm it was proved that the dominant mechanism in adsorption is chemical. In order to investigate the adsorption kinetics in this study, pseudo-first order and pseudo-second order equations were also examined. The pseudo-second order kinetic was fitted with experimental data with R-squared of 0.99 were fitted to the experimental data. BET and FESEM equipped with EDX analyzes have been used to investigate the physicochemical properties of the synthesized adsorbents. Also, the concentration of fuel solution was determined by UV-VIS.
 

کلیدواژه‌ها [English]

  • Adsorptive Desulfurization
  • Rice Husk Ash
  • Silica
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