مهندسی شیمی ایران

مهندسی شیمی ایران

کاهش گاز گلخانه‌ای دی‌اکسید کربن بااستفاده‌از جاذب کربن فعال سنتزشده از هستۀ سنجد

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد مهندسی شیمی
2 دانشیار مهندسی شیمی، دانشگاه تبریز
چکیده
افزایش غلظت دی‌اکسید کربن در جو، دولت­ها را مجبور کردهاست تا این مسأله را در بین مشکلات پر اهمیت خود قرار دهند. روش­های مختلفی برای جداسازی دی‌اکسید کربن وجود دارد که یکی از مهم­ترین آن‌ها، روش جذب سطحی بااستفادهاز جاذب­ های کربنی مانند کربن فعال است که می ­تواند از ضایعات زیستی مختلف سنتز شود. هدفاز این تحقیق، سنتز کربن فعال برای اولین‌بار از زیست‌تودۀ هستۀ سنجد بهمنظور جذب CO2 و بررسی مشخصه‌های مختلف بر ظرفیت جذب آن و هم‌چنین مطالعۀ پایداری جاذب طی چندین چرخۀ جذب و احیا است. در این تحقیق، ظرفیت جذب دی‌اکسید کربن جاذب­ها بهکمک آنالیز توزین حرارتی انجام پذیرفت. جاذب سنتزشده در نسبت وزنی عامل فعال­ساز هیدروکسید پتاسیم به زیست­توده برابر با 2 به 1، با ظرفیت جذب 2/78mmol/g  به عنوان جاذب منتخب معرفی شد. نتایج نشان داد که با افزایش دما از 25 به50 درجۀ سلسیوس، در غلظت 90 درصدی از گاز ­دی‌اکسید کربن، باتوجهبه ماهیت گرما­گیربودن فرایند جذب دی‌اکسید کربن، میزان جذب جاذب منتخب از 2/78 به1/79mmol/g   کاهش یافت. هم‌چنین با کاهش غلظت دی‌اکسید کربن ورودی به سامانه از 90 به 10 درصد، میزان جذب CO2 جاذب در دمای محیط، بهعلت تماس کمتر ذرات جاذب با مولکول­های CO2 در غلظت­های پایین، از 2/78 به1/03mmol/g    کاهش پیدا کرد. با بررسی­های به‌عملآمده، نتیجه­گیری شد که جاذب سنتزشده با هستۀ سنجد دارای ظرفیت جذب قابل قبول است. هم‌چنین، جاذب تهیهشده از پایداری بسیار خوبی برخوردار است و می­تواند بهعنوان یک جاذب مناسب برای مصارف صنعتی معرفی شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Reduction of Carbon Dioxide Greenhouse Gas Using Activated Carbon Adsorbent Synthesized from Oleaster Seed

نویسندگان English

M. J. Athari 1
M. Tahmasebpoor 2
1 M. Sc. Student of Chemical Engineering, University of Tabriz
2 Associate Professor of Chemical Engineering, University of Tabriz
چکیده English

Increasing the concentration of carbon dioxide in the atmosphere has forced governments to place this issue among their most important problems. There are different methods to capture carbon dioxide. One of the most important ones is adsorption that employs adsorbents such as activated carbon, which can be synthesized from various bio-wastes. In this research, activated carbon was synthesized from Oleaster seed to adsorb CO2 by investigating various effective parameters as well as its stability during adsorption/regeneration cycles. The CO2 adsorption capacity of the adsorbents was investigated utilizing thermogravimetric analysis (TGA). The adsorbent synthesized in the weight ratio of KOH: biomass as 2:1, with the adsorption capacity of 2.78 mmol/g was introduced as the selected sample. Results indicated that with the increase in temperature from 25 to 50°C, at CO2 concentration of 90%, the amount of adsorption decreased from 2.78 to 1.79 mmol/g, due to the endothermic nature of CO2 adsorption process. It was also found that by reducing the entering concentration of CO2 from 90 to 10%, the CO2 adsorption rate of the selected adsorbent decreased from 2.78 mmol/g to 1.03 mmol/g, regarding less contact between the adsorbent particles and CO2 molecules. It was concluded that the adsorbent synthesized from Oleaster seed shows an acceptable capability to adsorb CO2. This adsorbent also showed an excellent stability during the cycles, which makes us to introduce it as a good candidate for industrial applications.

کلیدواژه‌ها English

Carbon Dioxide
Adsorption Process
Activated Carbon
Oleaster Seed
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