بررسی حذف تولوئن از محلول های آبی با استفاده از نانوکیتوزان استخراج شده از پوسته میگو: ایزوترم و سینتیک جذب

Toluene, with the chemical formula C۶H۵CH۳, is one of the toxic and cancerous combinations of petroleum products and is one of the most important contaminants in the water. The high cost and low efficiency of some refining processes has created limitations in the elimination of these compounds. In the present study, the process of adsorption of toluene from aqueous solutions is investigated by nanocytosine adsorbent extracted from shrimp shell as a natural, inexpensive, and environmentally friendly adsorbent. Nano-chitosan is purchased from Sigma Aldrich USA. To determine the concentration of toluene, the Photonix Ar ۲۰۱۵ UV-Vis Array spectrophotometer is used at a wavelength of ۲۰۶ nm. In order to determine the optimal conditions for the toluene adsorption capacity by nanocytosins, the effect of different pH parameters in the range of ۳ to ۸ and contact time in the range of ۵ to ۱۲۰ minutes is investigated in a laboratory scale in a discontinuous system. The optimal values ​​for these parameters are ۵ and ۳۵ minutes, respectively. The Freundlich model with R۲ = ۰.۹۲ corresponded more to the balance data of toluene adsorption. The quasi-first-order and pseudo-second order kinetics models are used to test the kinetics of the reaction. Results indicated that the pseudo-second-order model with correlation coefficient of R۲ = ۰.۹۹ had better fit with experimental data. The results showed that nanocytosins have a very good ability to use in the process of toluene removal from aqueous solutions.

Keywords:

تولوئن , نانوکیتوزان , آلودگی نفتی , جذب سطحی