کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9468175 | 1316986 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Removal of dyes from aqueous solution using fly ash and red mud
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Removal of dyes from aqueous solution using fly ash and red mud Removal of dyes from aqueous solution using fly ash and red mud](/preview/png/9468175.png)
چکیده انگلیسی
Fly ash and red mud have been employed as adsorbents for the removal of a typical basic dye, methylene blue, from aqueous solution. Heat treatment and chemical treatment have also been applied to the as-received fly ash and red mud samples. It is found that fly ash generally shows higher adsorption capacity than red mud. The raw fly ash and red mud show adsorption capacity at 1.4Ã10â5 and 7.8Ã10â6Â mol/g, respectively. Heat treatment reduces the adsorption capacity for both fly ash and red mud but acid treatment by HNO3 induces a different effect on fly ash and red mud. Nitric acid treatment results in an increase in adsorption capacity of fly ash (2.4Ã10â5Â mol/g) while it decreases the adsorption capacity for red mud (3.2Ã10â6Â mol/g). The adsorption data have been analysed using Langmuir, Freundlich and Redlich-Peterson isotherms. The results indicate that the Redlich-Peterson model provides the best correlation of the experimental data. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. For fly ash and red mud, adsorption of methylene blue is endothermic reaction with ÎH0 at 76.1 and 10.8Â kJ/mol, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 39, Issue 1, January 2005, Pages 129-138
Journal: Water Research - Volume 39, Issue 1, January 2005, Pages 129-138
نویسندگان
Shaobin Wang, Y. Boyjoo, A. Choueib, Z.H. Zhu,