Application of Soybean Waste as Adsorbent of Remozol Black B from Aqueous Solution

The color of wastewater is considered as a major environmental problem. Chemical and biological treatment of dye containing wastewater is difficult due to the low adsorption level and chemical stability of dyes. Activated carbon is usually used for adsorption of these materials, but because of high prices and restore problems, researchers are trying to find available low-cost materials with high adsorption. In this research, soybean lignocellulosic waste has been investigated for absorption of Rimosol Black B (RBB) dye. First, the effect of dye RBB concentration, pH, temperature and contact time on the absorption value was investigated, and then the adherence of the adsorption isotherm to the Langmuir and Freundlich models was investigated. The results showed that the absorption efficiency depended strongly on pH and slightly on the temperature. The absorption rate of RBB dye with soybean residue is high and the absorption is complete in a short period of time. The results of the adsorption isotherm analysis showed that both models are suitable for describing the adsorption of RBB dye with soybean. The maximum absorption capacity of RBB dye by soybean waste was calculated 90.9 mg/g, which is more than some cheap absorbents studied and less than others such as rapeseed lignocellulosic waste.