摘要：Corncob was used as a low-cost biosorbent to remove malachite green (MG) from its aqueous solution.The influences of process parameters,such as initial pH,adsorbent dosage,temperature,contact time,and initial MG concentration on its adsorption capacity were investigated in a batch system.The equilibrium data were evaluated using the Langmuir and the Freundlich isotherms,and the former provided a perfect fit with the 9milxof 84.75 mg / g at 318 K.A new method derived from the Langmuir equilibrium constant Kl was firstly proposed to estimate the thermodynamics.The obtained negative AG values and positive AH values demonstrated a spontaneous endothermic process of MG onto corncob.The adsorption kinetics could be excellently described by the pseudo-second-order model.The intra-particle diffusion model plot showed a multiple linear feature.It was concluded that the intra-particle diffusion was one of the rate-controlling steps in this process.The natural corncob was proved to be a promising adsorbent to treat dye wastewater.
