Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

A novel Mg-Al metal oxide has been successfully synthesized by the calcination of hierarchical porous Mg-Al hydrotalcite clay obtained by using filter paper as a template under hydrothermal conditions. Various characterizations of the obtained nanoscale oxide particles verified the uniform dispersio...

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Bibliographic Details
Published in:Materials 2021-11, Vol.14 (23), p.7231
Main Authors: Li, Zhaoyi, Zhang, Jie, Qu, Chengtun, Tang, Ying, Slaný, Michal
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aluminum
Chemical oxygen demand
Clay
Filter paper
Fourier transforms
Lignite
Magnesium
Membrane separation
Metal oxides
Morphology
Nanomaterials
Nitrates
Oil field equipment
Oil fields
Pollutants
Porous materials
Radiation
Reaction kinetics
Structural analysis
Synthesis
Wastewater
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Summary:A novel Mg-Al metal oxide has been successfully synthesized by the calcination of hierarchical porous Mg-Al hydrotalcite clay obtained by using filter paper as a template under hydrothermal conditions. Various characterizations of the obtained nanoscale oxide particles verified the uniform dispersion of Mg-Al metal oxides on the filter paper fiber, which had a size of 2–20 nm and a highest specific surface area (SSA) of 178.84 m2/g. Structural characterization revealed that the as-prepared Mg-Al metal oxides preserved the tubular morphology of the filter paper fibers. Further experiments showed that the as-synthesized Mg-Al metal oxides, present at concentrations of 0.3 g/L, could efficiently remove sulfonated lignite from oilfield wastewater (initial concentration of 200 mg/L) in a neutral environment (pH = 7) at a temperature of 298 K. An investigation of the reaction kinetics found that the adsorption process of sulfonated lignite (SL) on biomorphic Mg-Al metal oxides fits a Langmuir adsorption model and pseudo-second-order rate equation. Thermodynamic calculations propose that the adsorption of sulfonated lignite was spontaneous, endothermic, and a thermodynamically feasible process.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14237231