Characterization and Congo Red uptake capacity of a new lignocellulose/organic montmorillonite composite

摘要

The lignocellulose/organic montmorillonite (LNC/OMMT) composite was prepared by intercalation reaction. The samples were characterized by FTIR, X-ray diffraction, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy, and spectroscopy scanning electron microscope. The results indicated that the LNC molecules may have different influences on physico-chemical properties of OMMT; an intercalated-exfoliated structure was formed. The effects of different adsorption temperature, initial pH value of the dye solution, adsorption time, and initial concentration of dye on adsorption capacities of samples for Congo Red dye have been investigated. Compared with the maximum adsorption capacity of LNC/MMT composite (51.16 mg/g), LNC/OMMT composite exhibited a higher adsorption capacity (102.32 mg/g). The adsorption kinetics and isotherms were also studied. It was shown that all the sorption processes were better fitted by pseudo-second-order equation and Langmuir equation. Desorption studies suggest that LNC/OMMT composite exhibited a certain extent of regeneration ability.