Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization
Multiwalled carbon nanotubes (MWCNTs) were modified by oxidation and acidification with concentrated HNO<sub>3</sub> and H<sub>2</sub>SO<sub>4</sub>, and the modified multiwalled carbon nanotubes (M-MWCNTs) and raw MWCNTs were characterized by several analytical t...
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MDPI AG
2023-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/4/1870 |
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| author | Yuan Zhou Yingying He Ruixue Wang Yongwei Mao Jun Bai Yan Dou |
| author_facet | Yuan Zhou Yingying He Ruixue Wang Yongwei Mao Jun Bai Yan Dou |
| author_sort | Yuan Zhou |
| collection | DOAJ |
| description | Multiwalled carbon nanotubes (MWCNTs) were modified by oxidation and acidification with concentrated HNO<sub>3</sub> and H<sub>2</sub>SO<sub>4</sub>, and the modified multiwalled carbon nanotubes (M-MWCNTs) and raw MWCNTs were characterized by several analytical techniques. Then the demanganization effects of MWCNTs and M-MWCNTs were well investigated and elucidated. The experimental data demonstrated that the adsorption efficiency of Mn(II) could be greatly promoted by M-MWCNTs from about 20% to 75%, and the optimal adsorption time was 6 h and the optimal pH was 6. The results of the kinetic model studies showed that Mn(II) removal by M-MWCNTs followed the pseudo-second-order model. Isothermal studies were conducted and the results demonstrated that the experimental data fitted well with the three models. The reliability of the experimental results was well verified by PSO–BP simulation, and the present conclusion could be used as a condition for further simulation. The research results provide a potential technology for promoting the removal of manganese from wastewater; at the same time, the application of various mathematical models also provides more scientific ideas for the research of the mechanism of adsorption of heavy metals by nanomaterials. |
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| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T08:21:32Z |
| publishDate | 2023-02-01 |
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| series | Molecules |
| spelling | doaj.art-f1f25b58d6bd4732bd0ef8dd4f4b3a772023-11-16T22:24:22ZengMDPI AGMolecules1420-30492023-02-01284187010.3390/molecules28041870Modification of Multiwalled Carbon Nanotubes and Their Mechanism of DemanganizationYuan Zhou0Yingying He1Ruixue Wang2Yongwei Mao3Jun Bai4Yan Dou5School of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaSchool of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaSchool of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaSchool of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaSchool of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaSchool of Water and Environment, Chang’an University, No. 126 Yanta Road, Xi’an 710054, ChinaMultiwalled carbon nanotubes (MWCNTs) were modified by oxidation and acidification with concentrated HNO<sub>3</sub> and H<sub>2</sub>SO<sub>4</sub>, and the modified multiwalled carbon nanotubes (M-MWCNTs) and raw MWCNTs were characterized by several analytical techniques. Then the demanganization effects of MWCNTs and M-MWCNTs were well investigated and elucidated. The experimental data demonstrated that the adsorption efficiency of Mn(II) could be greatly promoted by M-MWCNTs from about 20% to 75%, and the optimal adsorption time was 6 h and the optimal pH was 6. The results of the kinetic model studies showed that Mn(II) removal by M-MWCNTs followed the pseudo-second-order model. Isothermal studies were conducted and the results demonstrated that the experimental data fitted well with the three models. The reliability of the experimental results was well verified by PSO–BP simulation, and the present conclusion could be used as a condition for further simulation. The research results provide a potential technology for promoting the removal of manganese from wastewater; at the same time, the application of various mathematical models also provides more scientific ideas for the research of the mechanism of adsorption of heavy metals by nanomaterials.https://www.mdpi.com/1420-3049/28/4/1870M-MWCNTsMn(II) removalkinetic modelisotherm modelPSO-BP model |
| spellingShingle | Yuan Zhou Yingying He Ruixue Wang Yongwei Mao Jun Bai Yan Dou Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization Molecules M-MWCNTs Mn(II) removal kinetic model isotherm model PSO-BP model |
| title | Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization |
| title_full | Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization |
| title_fullStr | Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization |
| title_full_unstemmed | Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization |
| title_short | Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization |
| title_sort | modification of multiwalled carbon nanotubes and their mechanism of demanganization |
| topic | M-MWCNTs Mn(II) removal kinetic model isotherm model PSO-BP model |
| url | https://www.mdpi.com/1420-3049/28/4/1870 |
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