Abstract:

The nano-sized magnetic fluid in aqueous phase solution was prepared to modify the inactivated yeast cells. The modified yeast cells with good magnetic response were used to adsorb Direct Yellow R. The results showed that the adsorption capacity of modified yeast cells reached 1109.5122 μg/mg of Direct Yellow R at the concentration of 600 μg/mL, and adsorption equilibrium was achieved within 20 min. The adsorption equation was well fitted using Langmuir isothermal line, belonging to single molecular layer adsorption and conforming to the pseudo-second-order apparent kinetics equation. The adsorptive process was controlled by chemical mechanism. Because of the strong adsorption capacity, high adsorption speed and easy magnetic separation of the magnetically modified yeast cells as compared with yeast or magnetic fluid alone, their potential applications include treatment of waste water resulting from water-soluble dyes, helping reduce the pollution to the soil and water.