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Investigation into the Adsorption of Methylene Blue and Methyl Orange by UiO-66-NO2 Nanoparticles.

ABSTRACT: In this work, the adsorptive removal of methylene blue and methyl orange by UiO-66-NO2 nanoparticles was studied. The influence of pH on the adsorption capacity was assessed. The kinetics of the adsorption process were investigated and compared with pseudo-first-order, pseudo-second-order, Elovich, and intraparticle models. The kinetics of the adsorption fits moderately with the pseudo-first-order, but perfectly fits with pseudo-second-order models, and has a very good fit with the Elovich and intraparticle models. The adsorption isotherms were measured and compared with the Langmuir and Freundlich models. The adsorption capacity of methyl orange (MO) on UiO-66-NO2 nanoparticles (142.9 mg/g) was over three times higher than that of methylene blue (MB) on the nanoparticles (41.7 mg/g). The discrepancy between these capacities was attributed to the presence of the -NO2 functional group, which caused a strong negative mesomeric effect in the metal-organic framework structure.

SUBMITTER: Dinh HT 

PROVIDER: S-EPMC8216806 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature

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Investigation into the Adsorption of Methylene Blue and Methyl Orange by UiO-66-NO<sub>2</sub> Nanoparticles.

Dinh Hien Thi HT   Tran Nam Trung NT   Trinh Dai Xuan DX  

Journal of analytical methods in chemistry 20210612

In this work, the adsorptive removal of methylene blue and methyl orange by UiO-66-NO<sub>2</sub> nanoparticles was studied. The influence of pH on the adsorption capacity was assessed. The kinetics of the adsorption process were investigated and compared with pseudo-first-order, pseudo-second-order, Elovich, and intraparticle models. The kinetics of the adsorption fits moderately with the pseudo-first-order, but perfectly fits with pseudo-second-order models, and has a very good fit with the El  ...[more]

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