سال انتشار: ۱۳۹۳
محل انتشار: همایش ملی شیمی پاک
تعداد صفحات: ۱
نویسنده(ها):
Aynoor Allahgholian – Department of Chemistry, College of Sciences, Ahar Branch, Islamic Azad University, Ahar, Iran
Ali Mehrizad – Department of Chemistry, College of Sciences, East Azarbaijan Science and Research Branch, Islamic Azad University, Tabriz, Iran
Parvin Gharbani – Department of Chemistry, College of Sciences, Ahar Branch, Islamic Azad University, Ahar, Iran.

چکیده:

Methylene blue (MB) is the cationic dye that is most commonly used for coloring. It is generally used for dyeing cotton, wool, and silk [1,2]. MB can cause eye burns in humans and animals, cyanosis, convulsions, tachycardia, dyspnea, irritation to the skin, and if ingested, irritation to the gastrointestinal tract, nausea, vomiting, and diarrhea [3]. Thus, development of suitable methods for the decontamination of MB is necessary. In this research, adsorption capacity of MB onto modified TiO2 nanoparticles was investigated in a batch system by considering the effects of various parameters like contact time, adsorbent dosage, pH, initial dye concentration and temperature. Optimum conditions for MB adsorption were found to be pH≈۷, ۰٫۴ g of adsorbent and equilibrium time≈۵۰ min. The results showed that the increase of temperature and initial MB concentration leads to gradual decreas of adsorption rate. Evaluation of non-linear adsorption isotherm and kinetic models by Polymath software suggested that data can be well described by the pseudo-second-order kinetic and Freundlich isotherm models. Thermodynamic studies showed that the adsorption process was spontaneous and exothermic.