Adsorption and removal mechanism of Pb(II) by oxidized multi-walled carbon nanotubes

Multi-walled carbon nanotubes (MWCNTs) were treated by reflux oxidation in a mixture (HNO 3 and H 2 SO 4 ), hydroxyl (–OH) and carboxyl (–COOH) functional groups were introduced on the surface of MWCNTs to obtain the Oxidized-MWCNTs (OMWCNTs). OMWCNTs were used as adsorbent to removal of Pb(II) from...

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Bibliographic Details
Published in:Journal of the Iranian Chemical Society 2022-07, Vol.19 (7), p.2883-2890
Main Authors: Fu, Qiuping, Lou, Jie, Shi, Denghong, Zhou, Shaoqi, Hu, Jing, Wang, Qi, Huang, Weijiang, Wang, Kui, Yan, Wei
Format: Article
Language:English
Subjects:
Adsorption
Analytical Chemistry
Biochemistry
Calcium ions
Chemistry
Chemistry and Materials Science
Functional groups
Inorganic Chemistry
Isotherms
Lead
Multi wall carbon nanotubes
Organic Chemistry
Original Paper
Oxidation
Physical Chemistry
Sulfuric acid
Wastewater
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Summary:Multi-walled carbon nanotubes (MWCNTs) were treated by reflux oxidation in a mixture (HNO 3 and H 2 SO 4 ), hydroxyl (–OH) and carboxyl (–COOH) functional groups were introduced on the surface of MWCNTs to obtain the Oxidized-MWCNTs (OMWCNTs). OMWCNTs were used as adsorbent to removal of Pb(II) from wastewater. The effects of contact time, initial concentration of Pb(II), OMWCNTs dosage, pH and coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) on the adsorption and removal of Pb(II) by OMWCNTs were systematically studied. The adsorption of Pb(II) by OMWCNTs could reach equilibrium in 10 min. The pH > 5 is conductive to the adsorption of Pb(II) by OMWCNTs. The coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) had almost no effect on the adsorption of Pb(II) by OMWCNTs. The results showed that the isothermal data fit the Freundlich and Langmuir isotherm models. The maximum adsorption capacity was 558.66 mg/g for Pb(II) from Langmuir isotherm. The pseudo-second-order kinetic model could well describe the adsorption process of Pb(II).
ISSN:1735-207X
1735-2428
DOI:10.1007/s13738-022-02502-1