In this study, Cu-BTC,
a kind of metal–organic framework,
was used as an adsorbent to selectively adsorb methylene blue (abbreviated
as MB) from dye mixed wastewater. The synthesized Cu-BTC was characterized
by scanning electron microscopy, transmission electron microscopy,
Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray
photoelectron spectroscopy. The results indicated that the synthesized
Cu-BTC have an octahedral structure, with its specific surface area
at 45.16 m
2
/g and the pore sizes at 35–40 nm. The
influence of various parameters including the initial solution pH,
temperature, ionic strength, initial concentration, and contact time
on MB adsorption by Cu-BTC was investigated in detail. The adsorption
capacity of Cu-BTC toward MB was optimized at the pH value of 8, with
a lower temperature and a higher ionic strength. The adsorption isotherm
was found to fit well with the Langmuir model, and the kinetic curve
was found to be in good agreement with the pseudo-second-order kinetic
model. The adsorption mechanism was revealed to be the combined effects
of hydrophobicity and electrostatic adsorption. The synthesized Cu-BTC
adsorption material showed great potential for recovering MB from
dye-mixed wastewater.
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