شیمى کاربردى روز

شیمى کاربردى روز

مطالعه ترمودینامیک فرآیند جذب سطحی آلاینده قرمز مستقیم 16 توسط جاذب لیکا /زیرکونیا

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 گروه شیمی کاربردی، دانشکده علوم پایه، دانشگاه ملایر، ملایر ، ایران
2 گروه شیمی کاربردی، دانشکده علوم پایه، دانشگاه ملایر، ملایر، ایران
3 گروه شیمی فیزیک، دانشگاه آزاد اسلامی تبریز، تبریز، ایران
چکیده
این پژوهش به بررسی اثر دما و به تبع آن مطالعه ترمودینامیک فرآیند جذب سطحی ماده رنگ‌زای قرمز مستقیم 16 به عنوان آلاینده هدف در محیط آبی توسط بستر های ثابت جاذب لیکا/زیرکونیا می‌پردازد. تصاویر میکروسکوپ الکترونی عبوری و میکروسکوپ الکترونی روبشی ساخت موفقیت آمیز بسترها را تأیید نمودند. جهت اجرای فرآیند جذب سطحی، این بسترها در دیواره داخلی یک ظرف شش ضلعی دوجداره به طور ثابت جانمایی گردیدند. بررسی اثر دمای محیط بر فرآیند جذب سطحی، از طریق اجرای چندین آزمایش در شرایط pH برابر با2.7، در محدوده دمایی 5 تاC ° 40 بر روی محلول‌هایی با غلظت اولیه 30 میلی‌گرم بر لیتر از آلاینده هدف انجام شد. نتایج نشان دادند که دما اثر دوگانه‌ای در زمان‌های ابتدایی و انتهایی فرآیند جذب بر روی بازده حذف آلاینده دارد. در دقیقه دوم از آغاز فرآیند، افزایش دما از 5 بهC ° 40 منجر به افزایش بازده حذف از%44.1 به %55.7 می‌گردد. در دقیقه 30، افزایش دما از 5 بهC ° 40 منجر به کاهش بازده حذف از %93.2 به %89.3 می‌شود. بررسی‌های ترمودینامیکی نشان دادند که مقادیر منفی به‌دست آمده برای تغییرات آنتالپی 18.51 (kJ/mol)) ΔH°= - (، آنتروپی = -0.049 (kJ/mol.K)) ΔS° ( و انرژی آزاد گیبس (ΔG°< 0 (kJ/mol)) به ترتیب بیانگر جذب فیزیکی گرمازا، کاهش بی نظمی و خود‌به‌خودی بودن فرآیند جذب سطحی می‌باشد. همچنین مقدار انرژی فعال‌سازی فرآیند با بررسی اثر دما بر روی مقادیر ثابت سرعت مرتبه دوم فرآیند بر اساس رابطه خطی آرنیوس برابر با (kJ/mol) 16.09 به‌دست آمد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Thermodynamic Study of Adsorption Process of Direct Red 16 Pollutant by LECA/Zirconia Adsorbent

نویسندگان English

Ali Reza Soleymani 1
Azam Ramezani Delshad 2
Monireh Haerifar 3
1 Department of Applied Chemistry, Faculty of Basic Sciences, Malayer University, Malayer, Iran
2 Department of Applied Chemistry, Faculty of Basic Sciences, Malayer University, Malayer, Iran
3 Department of Physical Chemistry, Islamic Azad University of Tabriz, Tabriz, Iran
چکیده English

This study investigates the effect of temperature and consequently the thermodynamic study of the adsorption process of Direct Red 16 dye as a target pollutant in an aqueous environment using fixed LECA/Zirconia adsorbent substrates. For this purpose, a mineral compound called LECA (as a stable substrate) and zirconia nanoparticles (as adsorbent) were prepared separately in the laboratory. Zirconia nanoparticles were coated onto LECA substrate surfaces to form fixed LECA/Zirconia adsorbent substrates. The successful fabrication of the substrates was confirmed by examining transmission and scanning electron microscopy images. To perform the adsorption process, the substrates were fixed on the inner walls of a double-walled hexagonal container. The effect of ambient temperature on the adsorption process was investigated by conducting several experiments at pH 2.7 in the temperature range of 5°C–40°C on solutions with an initial concentration of 30 mg/L of the target pollutant. The results show that temperature has a dual effect on pollutant removal efficiency in the initial and final stages of the adsorption process. In the second minute, increasing the temperature from 5°C to 40°C increased the removal efficiency from 44.1% to 55.7%. In the 30th minute, increasing the temperature from 5°C to 40°C decreased the removal efficiency from 93.2% to 89.3%. Thermodynamic studies showed that the negative values obtained for enthalpy (ΔH° = -18.51 (kJ/mol)), entropy (ΔS° = -0.049 (kJ/mol.K)), and Gibbs free energy (ΔG° < 0 (kJ/mol)) changes indicate exothermic physical adsorption, disorder reduction, and spontaneity of the adsorption process, respectively. The activation energy of the process was obtained by examining the effect of temperature on the second-order rate constants of the process based on the Arrhenius linear relationship, which is equal to 16.09 (kJ/mol).

کلیدواژه‌ها English

Wastewater treatment
LECA/Zirconia adsorbent
Temperature effect
Thermodynamic
Direct Red 16
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