جذب سطحی والریک‌اسید از محیط آبی به‌وسیلۀ کربن فعال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی شیمی -دانشکده فنی ومهندسی -دانشگاه گیلان رشت-ایران

2 گروه مهندسی شیمی- دانشکده فنی و مهندسی -دانشگاه گیلان رشت-ایران

3 گروه مهندسی شیمی دانشکده فنی دانشگاه گیلان

4 دانشگاه گیلان

چکیده

در پژوهش حاضر، جداسازی والریک‌اسید به‌روش جذب سطحی با کربن فعال در دماهای گوناگون ارزیابی‌شد. عوامل مختلفی شامل زمان، دوز جاذب، درجۀ حرارت،  pH، اندازۀ ذره و غلظت اولیه مطالعه‌شد. زمان تعادل، دوز جاذب و دمای مطلوب به‌ترتیب 120 دقیقه،
1 گرم و 45 درجۀ سلسیوس مشاهده‌شد.
pH مناسب برابر 4 تعیین شد. با بررسی روابط هم‌دمایی، الگوی لانگمویر با نتایج آزمایشگاهی تطابق مناسبی داشت. طبق این الگو، بالاترین ظرفیت جذب 078/196 میلی­گرم بر گرم حساب‌شد. به‌علاوه، الگوی شبه مرتبۀ دوم همبستگی بیشتری را در میان سایر روابط جنبش‌شناختی از خود نشان داد. علامت‌های منفی انرژی آزاد گیبس و مثبت آنتالپی به‌ترتیب، بیانگر خود­به­خودی و گرماگیر بودن فرایند است. هم‌چنین، علامت مثبت تغییرات آنتروپی در این پژوهش گویای افزایش فعالیت ذرات در حین جذب بر روی کربن فعال تسن.

کلیدواژه‌ها


عنوان مقاله [English]

Adsorption of Valeric Acid from Aqueous Solution Onto the Activated Carbon

نویسندگان [English]

  • H. Masoomie 1
  • R. Jamshidian 2
  • H. Ghanadzadeh Gilani 3
  • B. Abbasi Souraki 4
1 University Of Guilan
2 University Of Guilan
3 University Of Guilan
4 University Of Guilan
چکیده [English]

In this research, adsorption of valeric acid from aqueous solution was investigated at different temperatures (25, 35 and 45°C) by using activated carbon in a batch system. In order to determine the functional groups in structure of adsorbent and surface characteristics of adsorbent, FTIR and SEM analysis were used, respectively. In the adsorption experiments, the effect of important parameters such as effect of contact time, the amount of adsorbent, temperature and initial acid concentration were investigated. Equilibrium time was determined 120 min. The optimum amount of adsorbent was determined 1.0g (for 40ml of solution). Investigation of the temperature effect demonstrated that the percentage of removed valeric acid increased by increasing the temperature. Different types of adsorption isotherms models such as Langmuir, Freundlich, and Temkin models were applied to analyze the equilibrium data at different temperatures and Langmuir isotherm had the most agreement with experimental data at different temperatures (with maximum R2 values). The maximum adsorption capacity by using Langmuir isotherm model was determined 196.078 mg/g. Different kinetic models such as pseudo- first order, pseudo-second order, Elovich and intraparticle diffusion model were chosen to describe the kinetic of adsorption, and pseudo-second order model had the best agreement with experimental data for each adsorbents.
Thermodynamic parameters like standard Gibbs free energy changes of adsorption  , standard enthalpy changes of adsorption  and standard entropy changes of adsorption  were calculated by using equilibrium constant values at different temperatures. Negative value of  demonstrated that adsorption of valeric acid was spontaneity and positive values of  showed that adsorption of valeric acid on adsorbent was endothermic.

کلیدواژه‌ها [English]

  • Adsorption
  • Valeric Acid
  • Activated carbon
  • Isotherm
  • Kinetic
  • Thermodynamics
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