مهندسی شیمی ایران

مهندسی شیمی ایران

حذف متیلن‌بلو به‌وسیلۀ سیلیکا ایروژل به‌روش جذب سطحی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار مهندسی شیمی، دانشگاه زنجان
2 کارشناسی ارشد مهندسی شیمی، دانشگاه صنعتی امیرکبیر
چکیده
رنگ‌های مصنوعی- مانند متیلنبلو- که کاتیونی و یکیاز آلاینده‌های مهم و سمی در آب هستند؛ دربرابر تجزیۀ زیستی مقاوم‌اند. جذب سطحی یک روش مؤثر برای حذف این رنگ‌ها از آب است. ایروژل‌های سیلیکایی به‌دلیل داشتن سطح ویژه و تخلخل بالا، به‌عنوان جاذب‌های کارامد در این زمینه مطرح‌شده‌اند. در این پژوهش، جذب متیلنبلو از محلول آبی متیلن‌بلو در غلظت‌های مختلف از 5 تا 150 میلیگرمدرلیتر و در دو دمای 25 و 40 درجۀ سلسیوس و بااستفاده‌از مقادیر مختلف سیلیکا ایروژل به‌عنوان جاذب، مطالعه‌شده‌است. درمحدودۀ شرایط مورد مطالعه، بالاترین میزان جذب متیلن‌بلو برروی سیلیکا ایروژل mg/g42‌ به‌دست‌آمد و در آزمایش‌های مختلف درصد حذف متیلن‌بلو درمحدودۀ 38-97% حاصل‌شد. سرعت و ظرفیت جذب سامانۀ متیلن‌بلو- سیلیکا ایروژل مطالعهشد. سینتیک جذب با دو مدل سرعت شبه مرتبۀ اول و مرتبۀ دوم ارزیابیشد. مشاهدهشد که دادههای تجربی از مدل سرعت مرتبۀ اول تبعیت بیشتری دارد. هم‌چنین، به بررسی رابطۀ بین دادههای تجربی و معادلۀ ایزوترمهای لانگمویر و فروندلیچ پرداختهشد. نتایج نشانداد که بین دادههای تجربی و ایزوترم لانگمویر تطابق بیشتری وجوددارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Adsorption Removal of Methylene Blue Using Silica Aerogel Adsorbent

نویسندگان English

T. Yousefi Amiri 1
M. Bagheri 2
1 Assistant Professors of Chemical Engineering, University of Zanjan
2 MSc. in Chemical Engineering, Amirkabir University of Technology
چکیده English

Synthetic dyes such as methylene blue, which are cationic and one of the most important and toxic pollutants in water, are resistant to biodegradation. Adsorption is an effective method to remove these dyes from water. Silica aerogels have been considered as efficient adsorbents due to their specific surface area and high porosity.
In this research, the adsorption of methylene blue from an aqueous solution of methylene blue in different concentrations from 5 to 150 mg/L and at two temperatures of 25 and 40 °C and using different amounts of silica aerogel as adsorbent has been studied. Within the studied conditions, the highest adsorption capacity of methylene blue on silica aerogel was 42 mg/g, and in different tests, the removal percentage of methylene blue was 38-97%.
The kinetics and capacity of adsorption of methylene blue-silica aerogel system were studied. Adsorption kinetics were evaluated through two pseudo-first-order and second-order kinetics models. Based on the correlations and the regression, it was observed that the experimental data are more consistent with the first-order kinetics model. Also, the corelation between the experimental data and the equation of Langmuir and Freundlich isotherms was investigated. The results showed that there is a better agreement between the experimental data and the Langmuir isotherm.

کلیدواژه‌ها English

Adsorption
Methylene Blue
Silica Aerogel
Isotherm
Kinetics
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