کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
580967 1453155 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Removal of Congo Red from aqueous solution by cattail root
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Removal of Congo Red from aqueous solution by cattail root
چکیده انگلیسی
In this study, cattail root was used to remove Congo Red (CR) from aqueous solution. The effects of operation variables, such as cattail root dosage, contact time, initial pH, ionic strength and temperature on the removal of CR were investigated using batch adsorption technique. Removal efficiency increased with increase of cattail root dosage and ionic strength, but decreased with increase of temperature. The equilibrium data fitted well to the Langmuir model (R2 > 0.98) and the adsorption kinetic followed the pseudo-second-order equation (R2 > 0.99). Thermodynamics parameters such as standard free energy change (ΔG°), standard enthalpy change (ΔH°), and standard entropy change (ΔS°) were analyzed. The values of ΔG° were between −7.871 and −4.702 kJ mol−1, of ΔH° was −54.116 kJ mol−1, and of ΔS° was −0.157 kJ mol−1 K−1, revealing that the removal of CR from aqueous solution by cattail root was a spontaneous and exothermic adsorption process. The maximum adsorption capacities of CR on cattail root were 38.79, 34.59 and 30.61 mg g−1 at 20, 30 and 40 °C, respectively. These results suggest that cattail root is a potential low-cost adsorbent for the dye removal from industrial wastewater.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 173, Issues 1–3, 15 January 2010, Pages 292-297
نویسندگان
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