Study on adsorption performance of corncob-based porous carbon on dyes in wastewater
Corncob-based porous carbon was prepared from corncob,an agricultural waste,using K2CO3 as an activator.X-ray diffraction(XRD),Fourier Transform infrared spectroscopy(FT-IR),Scanning elec-tron microscope(SEM)and BET were used to analyses the pore structure and surface properties of the corncob-based porous carbon,and to investigate the removal effects on methyl blue,crystal violet and in-digotindisulfonate sodium.The optimum adsorption conditions for the removal of methyl blue,crystal vio-let and indigotindisulfonate sodium were determined.Corncob-based porous carbon has good adsorption capacity for all three dyes,but the best adsorption capacity for crystal violet dye.The adsorption thermo-dynamic mechanism analysis confirmed that the adsorption process was a spontaneous heat absorption process.The adsorption of the three dyes on corncob-based porous carbon was consistent with the quasi-secondary kinetic model,the intra-particle diffusion model,and the Langmuir isothermal adsorption mod-el,confirming that the adsorption process was a monomolecular layer adsorption process controlled by chemical mechanisms.
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