The Efficiency of Modified Wheat Brad in Reactive Black 5 Dye Removal from Aqueous Solutions

Background: Surface absorption using low cost materials has been an appropriate method to treat lots of industrial wastewater. The aim of this study was application of wheat brad as a low cost adsorbent for reactive black 5 removal from textile wastewater. Methods: In this study, modified wheat brad was used for dye removal from textile wastewater at laboratory scale. Cetylpyridinium chloride monohydrate (CPC) at 2.5 mmol/L was applied for modification of wheat brad. The experiments were conducted at batch system and the effects of parameters such as pH, adsorbent dose, initial dye concentration and contact time on RB5 adsorption by modified wheat brad were studied. Results: According to the results of this study, the minimum and maximum dye removal efficiency were obtained at pH solution 1 and 7 that were 61.54% and 83.15%, respectively. With increasing contact time and adsorbent dose, dye removal efficiency increased. Furthermore, by increasing the dye initial concentration in solution, dye removal rate increased and dye removal efficiency decreased. Based on the results, the Langmuir isotherm and second order kinetics are the best modules for explanation of RB5 adsorption onto modified wheat brad. Conclusion: Considering the high cost of other methods in dye removal, modified wheat brad could be used as a relatively efficient and low cost adsorbent in dye removal from textile wastewater. Keywords: Adsorption, Reactive black 5, Aqueous solutions, Wheat bra