کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
144507 438937 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic and kinetic studies for the adsorption of Hg(II) by nano-TiO2 from aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Thermodynamic and kinetic studies for the adsorption of Hg(II) by nano-TiO2 from aqueous solution
چکیده انگلیسی

Titanium dioxide nanocrystals were employed, for the first time, for the sorption of Hg(II) ions from aqueous solutions. The effects of varying parameters such as pH, temperature, initial metal concentration, and contact time on the adsorption process were examined. Adsorption equilibrium was established in 420 min and the maximum adsorption of Hg(II) on the TiO2 was observed to occur at pH 8.0. The adsorption data correlated with Freundlich, Langmuir, Dubinin–Radushkevich (D–R), and Temkin isotherms. The Freundlich isotherm showed the best fit to the equilibrium data. The Pseudo-first order and pseudo-second-order kinetic models were studied to analyze the kinetic data. A second-order kinetic model fit the data with the (k2 = 2.8126 × 10−3 g mg−1min−1, 303 K). The intraparticle diffusion models were applied to ascertain the rate-controlling step. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were calculated which showed an endothermic adsorption process. The equilibrium parameter (RL) indicated that TiO2 nanocrystals are useful for Hg(II) removal from aqueous solutions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 23, Issue 2, March 2012, Pages 148–156
نویسندگان
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