Studies on the thermal activation of red clays for dye adsorption application

Fooladivanda, Sasan (2017) Studies on the thermal activation of red clays for dye adsorption application. Masters thesis, University of Mohaghegh Ardabili.

Preview

Text (مطالعه فعال‌سازی گرمايي خاک رس قرمز برای کاربرد به‌عنوان جاذب برای رنگ مدل) Sasan Fooladivanda.pdf Download (434kB) | Preview

Abstract

In this study, activation of natural clay was carried out to increase absorption capacity. For this purpose, activated clay has been used to remove methylene blue dye using adsorption process. Finally, the conditions governing the process are optimized. In order to achieve the above objectives, the clay in Meshkinshahr was initially activated in different acid, thermal and alkaline methods, Then, X-ray diffraction (XRD), Infrared (FTIR), X-ray diffraction analysis (EDX) and intrusive reflection spectrometry analysis (DRS Brunauer–Emmett–Teller (BET) and Fourier transform analysis were used to investigate the physical, chemical and morphological properties. The results of chemical analyzes showed that activated clay with 3 molar acid had the highest absorption capacity among other activation methods. The effective factors on adsorption include the pH of the solution (5-11), the colorant concentration (100-400 ppm), the amount of adsorbent (0.03 -2 gr), and the contact time (10-120 min), in the adsorption of methylene blue on the adsorbent was evaluated and the optimal conditions were determined. The optimal results were in pH =11, the absorbing value was 0.05 grams and the contact time was 120 minutes. adsorption behavior of Absorbent showed that the kinetics and isotherm of adsorption was in good agreement with the pseudo-second order and Langmuir equation, the maximum adsorption capacity of clay was 0.4 mg/g and with the adsorbent of modified clay 20.02 mg/g. The results showed that modified clay could be used as an efficient absorbent to remove methylene blue from aqueous solutions.

Actions (login required)

View Item