New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron
Nanoscale zero-valent iron (nZVI) has become a new and ecofriendly adsorbent material with promising applications. Herein, hydrotalcite-supported nanoscale zero-valent iron (nZVI@H) is synthesized for the first time and used for testing the removal of methylene blue (MB) in an aqueous solution. The...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/1/183 |
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| author | Jiaqi Fan Bo Zhang Bohong Zhu Weili Shen Yuan Chen Fanjun Zeng |
| author_facet | Jiaqi Fan Bo Zhang Bohong Zhu Weili Shen Yuan Chen Fanjun Zeng |
| author_sort | Jiaqi Fan |
| collection | DOAJ |
| description | Nanoscale zero-valent iron (nZVI) has become a new and ecofriendly adsorbent material with promising applications. Herein, hydrotalcite-supported nanoscale zero-valent iron (nZVI@H) is synthesized for the first time and used for testing the removal of methylene blue (MB) in an aqueous solution. The successful fabrication of nZVI@H is characterized by SEM, BET, XRD, FTIR and zeta-potential analyses. The results showed that 99.6% of MB is removed using nZVI@H after 30 min of reaction at an initial MB concentration of 40 mg·L<sup>−1</sup>, while the bare nZVI is only at 71.2%. The kinetic analysis yielded that the removal process of MB using nZVI@H is consistent with the Langmuir model and the quasi-second-order kinetic model. According to the Langmuir model, the maximum adsorption of nZVI@H on MB is 81 mg·g<sup>−1</sup>. This study provides a new idea about the mechanism of MB removal, namely, MB is converted to the colorless LMB through an Fe<sup>0</sup> redox reaction and simultaneously attached at the surface of nZVI@H through an adsorption process, and finally removed via complexation precipitation. |
| first_indexed | 2024-03-09T11:48:40Z |
| format | Article |
| id | doaj.art-aaf0da15ce7048cbb5ab1f1c96a33b06 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T11:48:40Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-aaf0da15ce7048cbb5ab1f1c96a33b062023-11-30T23:17:34ZengMDPI AGWater2073-44412023-01-0115118310.3390/w15010183New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent IronJiaqi Fan0Bo Zhang1Bohong Zhu2Weili Shen3Yuan Chen4Fanjun Zeng5College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhunzhou 421000, ChinaCollege of Materials and Advanced Manufacturing, Hunan University of Technology, Zhunzhou 421000, ChinaCollege of Materials and Advanced Manufacturing, Hunan University of Technology, Zhunzhou 421000, ChinaCollege of Materials and Advanced Manufacturing, Hunan University of Technology, Zhunzhou 421000, ChinaLinwu Shunfa Investment Group, Chenzhou 424300, ChinaLinwu Shunfa Investment Group, Chenzhou 424300, ChinaNanoscale zero-valent iron (nZVI) has become a new and ecofriendly adsorbent material with promising applications. Herein, hydrotalcite-supported nanoscale zero-valent iron (nZVI@H) is synthesized for the first time and used for testing the removal of methylene blue (MB) in an aqueous solution. The successful fabrication of nZVI@H is characterized by SEM, BET, XRD, FTIR and zeta-potential analyses. The results showed that 99.6% of MB is removed using nZVI@H after 30 min of reaction at an initial MB concentration of 40 mg·L<sup>−1</sup>, while the bare nZVI is only at 71.2%. The kinetic analysis yielded that the removal process of MB using nZVI@H is consistent with the Langmuir model and the quasi-second-order kinetic model. According to the Langmuir model, the maximum adsorption of nZVI@H on MB is 81 mg·g<sup>−1</sup>. This study provides a new idea about the mechanism of MB removal, namely, MB is converted to the colorless LMB through an Fe<sup>0</sup> redox reaction and simultaneously attached at the surface of nZVI@H through an adsorption process, and finally removed via complexation precipitation.https://www.mdpi.com/2073-4441/15/1/183hydrotalcite-supported nanoscale zero-valent ironremovalmechanismmethylene blue |
| spellingShingle | Jiaqi Fan Bo Zhang Bohong Zhu Weili Shen Yuan Chen Fanjun Zeng New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron Water hydrotalcite-supported nanoscale zero-valent iron removal mechanism methylene blue |
| title | New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron |
| title_full | New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron |
| title_fullStr | New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron |
| title_full_unstemmed | New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron |
| title_short | New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron |
| title_sort | new insight into the mechanism for the removal of methylene blue by hydrotalcite supported nanoscale zero valent iron |
| topic | hydrotalcite-supported nanoscale zero-valent iron removal mechanism methylene blue |
| url | https://www.mdpi.com/2073-4441/15/1/183 |
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