Insights into role of microstructure in TNT adsorption performances onto zeolite, diatomite and kaolinite particles

Adsorption performances of one pollutant on different adsorbents likely depend on the adsorbent microstructures heavily. Hereon, zeolite, diatomite and kaolinite particles were selected as inexpensive adsorbents in this study with 2,4,6-trinitrotoluene (TNT) as an organic pollutant for the batch tes...

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Bibliographic Details
Published in:Discover Applied Sciences 2024-07, Vol.6 (8), p.420, Article 420
Main Authors: Wu, Yaoguo, Meng, Chengzhen, Guo, Qian, Sun, Ran, Hu, Sihai, Yi, Mengying, Shen, Jiaru, Sun, Changyu
Format: Article
Language:English
Subjects:
2,4,6-Trinitrotoluene
Adsorbents
Adsorption
Applied and Technical Physics
Chemical properties
Chemisorption
Chemistry/Food Science
Clay minerals
Diatomaceous earth
Earth Sciences
Endothermic reactions
Engineering
Environment
Fourier transforms
Functional groups
Kaolinite
Kinetics
Materials Science
Microstructure
Minerals
Morphology
Physical properties
Pollutants
Pore size
Scanning electron microscopy
Software
Synergistic effect
Trinitrotoluene
Water treatment
Zeolites
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Summary:Adsorption performances of one pollutant on different adsorbents likely depend on the adsorbent microstructures heavily. Hereon, zeolite, diatomite and kaolinite particles were selected as inexpensive adsorbents in this study with 2,4,6-trinitrotoluene (TNT) as an organic pollutant for the batch test to verify the effect of adsorbent microstructure on TNT adsorption performance. The results of kinetic, adsorption isothermic, and thermodynamic analyses indicated that the adsorption process of TNT on three particles is controlled by chemisorption, and that both are non-spontaneous entropic endothermic reactions, although they have their own specific adsorption capacities, equilibration times, and kinetic rates. Comprehensively analyzing the characterization data and adsorption performances of the particles shows that, the pore physical properties including the pore diameter distribution and volume obviously control the adsorption capacities, and well the pore surface chemical properties such as the functional groups affect the adsorption kinetics; the microstructure affects the performances through the synergistic effect of physical and chemical pathways and results in the special performances. Briefly, a particle has its special microstructure and then determinedly unique performance. The finding provides insights into the role of the microstructure of the particles in their performances, and significances for selecting and utilizing the adsorbents in water treatment. Highlights Effect of the particle microstructure on TNT adsorption was reported. Chemical properties of the particle pores affected adsorption performance. Adsorption of TNT was a non-spontaneous entropy-enhancing endothermic reaction. The adsorption mechanism of clay minerals was revealed.
ISSN:3004-9261
2523-3963
3004-9261
2523-3971
DOI:10.1007/s42452-024-06121-8