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Adsorption Of Direct Red 23 From Aqueous Solution Using Rice Husk Activated By Citric Acid

Ahmed El Nemr, Azza Khaled, Ola Abdelwahab, Amany El Sikaily

The goal of this research is to develop a new and efficient adsorbent of direct dyes. Thus, rice husk, a commonly available agriculture waste in Egypt, was investigated as viable materials for treatment of synthetic Direct Red 23 containing industrial wastewater. Activation of rice husk with citric acid was studied in order to increase its capacity to remove the dye. The results obtained from the batch experiments revealed the ability of the rice husk in removing the Direct Red 23 and are dependent on the dye and rice husk concentrations. Kinetics of adsorption was investigated as well as equilibrium isotherm of Direct Red 23 using Langmuir model, which represented a correlation coefficient > 0.96. The maximum adsorption capacity was 13 g of dye per kilogram of dry rice husk. This study showed that the rice husk could be employed as low-cost for the removal of Direct Red 23 from aqueous solution.