Adsorption of Methylene blue from aqueous solutions by modified nano-TiO2

سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 768

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تاریخ نمایه سازی: 19 تیر 1394

چکیده مقاله:

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≈7, 0.4 g of adsorbent and equilibrium time≈50 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.


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.