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Preparation of borate anions intercalated MgAl-LDHs microsphere and its calcinated product with superior adsorption performance for Congo red

Jia, Ya-Huan, Liu, Zhi-Hong
Colloids and surfaces 2019 v.575 pp. 373-381
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, adsorbents, adsorption, aqueous solutions, borates, differential scanning calorimetry, dyes, equations, hydroxides, microparticles, models, nanosheets, pH, scanning electron microscopy, surface area, temperature, thermogravimetry, transmission electron microscopy, wastewater treatment
In the present study, the borate anions intercalated MgAl-layered double hydroxides (B-LDHs) microsphere and its calcinated product (B-LDOs) have been prepared by precursor method and characterized by the XRD, FT-IR, XPS, TG-DSC, SEM and TEM. This microsphere with hierarchical porous nanostructure was assembled by nanosheets. The B-LDHs and B-LDOs samples have high specific surface area of 138.6 m2 g −1 and 123.0 m2 g−1 measured by N2 adsorption−desorption, respectively. They were used as adsorbents to remove Congo red (CR) dye in an aqueous solution, exhibiting excellent adsorption performance with maximum adsorption capacities of 166 and 273 mg g −1 for CR respectively, which outperform most of the reported adsorbents in literatures. The adsorption processes nicely fitted with the kinetic pseudo-second-order rate equation and Langmuir adsorption model. The effects of B-LDOs sample dosage, pH and temperature of CR solution on adsorption were investigated. The possible adsorption mechanisms were also proposed. It can be expected that both samples, especially B-LDOs sample with higher adsorption efficiency and good reusability, could be considered as promising candidates for wastewater treatment.