مطالعه جذب سطحی حذف رنگزای مالاخیت سبز با استفاده از گاما آلومینای عامل‌دار شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه شیمی کاربردی، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران

2 استادیار شیمی، گروه شیمی کاربردی، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران

چکیده

در این مقاله، گاما آلومینای عامل‌دار شده برای حذف رنگزای کاتیونی مالاخیت سبز از محلول‌های آبی به روش جذب سطحی مورد استفاده قرار گرفت. ابتدا خصوصیات ذرات عامل‌دار شده با FT-IR، SEM، XRD و EDAX شناسایی شد. سپس اثر پارامترهای مختلف از جمله غلظت اولیه رنگزا، زمان تماس، pH آغازین، دز جاذب و دما بر روی حذف رنگزای مالاخیت سبز مطالعه شد. pH نقطه صفر بار جاذب نیز تعیین شد. نتایج نشان داد که فرایند جذب سطحی در 60 دقیقه به تعادل می‌رسد و مقدار حذف رنگزا با افزایش دز جاذب و pH افزایش می‌یابد. مطابق نتایج 1/0 گرم از گاما آلومینای عامل‌دار شده قادر به حذف 69/91 درصد از رنگزای مالاخیت سبز در غلظت اولیه 50 میلی‌گرم در لیتر و در pH برابر 10 است. مطالعه ایزوترم و سینتیک جذب سطحی نشان داد که جذب سطحی رنگزای مالاخیت سبز بر روی گاما آلومینای عامل‌دار به خوبی از مدل ایزوترم تمکین و سینتیک شبه مرتبه دوم پیروی می‌کند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Adsorption of Malachite Green Dye Using Modified γ-Alumina

نویسندگان [English]

  • Roghaye Zarrinkamar 1
  • Parvin Gharbani 2
1 MSc Student of Applied Chemistry, Ahar Branch, Islamic Azad University, Ahar, Iran
2 Assist. Prof. of Applied Chemistry, Ahar Branch, Islamic Azad University, Ahar, Iran
چکیده [English]

Modified γ-Alumina was used for the adsorption of the cationic dye malachite green (MG) from aqueous solutions. The properties of the modified particles were initially determined by FT-IR, XRD, SEM, and EDAX. The effects of such parameters as initial dye concentration, contact time, initial pH, adsorbent dose, and temperature on dye removal were investigated and the pHzpc of the adsorbent was determined. Results showed that equilibrium was achieved in 60 min and MG removal increased with increasing adsorbent dosage and pH. The experimental results indicated that 0.1g of modified γ-Alumina was capable of removing 91.61% of the MG dye from an initial concentration of 50 mg L-1 at pH=10. Results of isotherm and kinetic studies revealed that adsorption of Malachite Green dye onto modified γ-Alumina best fitted the Temkin isotherm and pseudo-second-order kinetic models.

کلیدواژه‌ها [English]

  • γ-Alumina
  • Malachite Green Dye
  • Kinetic
  • Isotherm
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