Application of Modified Water Nut Carbon as a Sorbent in Congo Red and Malachite Green Dye Contaminated Wastewater Remediation

Batch and column adsorption experiments were conducted to investigate the removal of dyes from wastewater by water nut modified carbon (WNMC). Acidic pH was favorable for adsorption for Congo red dyes and basic pH was favorable for the adsorption for Malachite green dyes. The surface property of the sorbent was characterized by scanning electron microscopy and Fourier transform infrared techniques. The adsorption process was found to be endothermic and spontaneous. Different models of adsorption were used to describe the kinetics data and to calculate the corresponding rate constants of WNMC surfaces for dyes adsorption. A mechanism of dyes adsorption associating chemisorption processes is presented allowing the discussion of the variations in adsorption behavior of the material. These data suggested that WNMC are promising materials for dyes sorption. The data were in good agreement with bed depth service time model.