The present paper is aimed to develop a low-cost adsorption method using an agro-waste material soybean hull as an adsorbent for color removal from wastewater. The morphological characterization of soybean hull was done by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction analysis, and zeta potential measurement. The soybean hull was utilized as an adsorbent for removal of safranin dye from the aqueous solutions. The effects of operating parameters such as pH, initial dye concentration, adsorbent dose, particle size of the adsorbent, and contact time were investigated. The adsorption data were modeled by the Freundlich, Langmuir, and Tempkin adsorption isotherm models. The thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic. Also, the adsorption kinetics of dyes were found to follow the pseudo-second-order kinetics. Desorption study elucidates the mechanism of adsorption as well as recovery of adsorbent material. The results revealed that the soybean hull, a natural, eco-friendly, and low-cost adsorbent has a relatively large adsorption capacity and can be effectively used for removal of dyes from the wastewater.
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Chandane et al. (2014) studied this question.
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