Zingiber officinale powder as a biosorbent for adsorption of acid violet 90 from aqueous solutions

Abstract

The potential of Zingiber officinale powder was explored as a biosorbent for the uptake of Acid Violet 90 dye from the aqueous solutions. The biosorbent was characterized using FTIR, XRD, SEM, and Zeta potential techniques. The impact of various experimental parameters such as pH, dye concentration, adsorbent dose, contact time, and temperature on the adsorption capacity of biosorbent was investigated using batch adsorption. The Zingiber officinale powder showed a dye adsorption efficiency of 342.68 mg/g. The optimum adsorption was achieved at pH 2, adsorbent dose of 0.2 g/L, contact time of 10 min, and 40 mg/L dye concentration at a temperature of 30 °C. The experimental isotherm data was analyzed by two-parameter and three-parameter models and best explained by the Freundlich model. The pseudo-second-order model elucidated the kinetic behavior of the uptake with pore-diffusion as the rate-determining step. The thermodynamic study suggested the uptake of dye was feasible, spontaneous, and exothermic in nature. The results revealed that the Zingiber officinale powder has the potential to be used as an adsorbent for the treatment of water.