Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
580967 | Journal of Hazardous Materials | 2010 | 6 Pages |
Abstract
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 (ÎG°), standard enthalpy change (ÎH°), and standard entropy change (ÎS°) were analyzed. The values of ÎG° were between â7.871 and â4.702 kJ molâ1, of ÎH° was â54.116 kJ molâ1, and of ÎS° was â0.157 kJ molâ1 Kâ1, 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 gâ1 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.
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Authors
Zhenhu Hu, Hui Chen, Feng Ji, Shoujun Yuan,