Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater
Hexavalent chromium, one of the heavy metal pollutants in water, harms the ecological environment and human health. In this work, an aniline-<i>p</i>-phenylenediamine copolymer has been prepared by chemical oxidative polymerization to remove the hexavalent chromium (Cr(VI)) from wastewat...
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2024-11-01
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| author | Yifeng Li Jingyue Chen Xiwei Tan Han Lou Hongbo Gu |
| author_facet | Yifeng Li Jingyue Chen Xiwei Tan Han Lou Hongbo Gu |
| author_sort | Yifeng Li |
| collection | DOAJ |
| description | Hexavalent chromium, one of the heavy metal pollutants in water, harms the ecological environment and human health. In this work, an aniline-<i>p</i>-phenylenediamine copolymer has been prepared by chemical oxidative polymerization to remove the hexavalent chromium (Cr(VI)) from wastewater. The results show that when the initial Cr(VI) concentration is 1.5 mg·L<sup>−1</sup>, the removal percentage (RP%) of Cr(VI) could reach 94.84% after 180 s of treatment. The RP% of Cr(VI) increases with the dosage of copolymers and decreases with an increase in the initial Cr(VI) concentration. Additionally, the RP% of Cr(VI) removal reaches a maximum of 97.70% with a pH value of 1.0. The Cr(VI) removal kinetics of the copolymers follows a pseudo-first-order chemical reaction model. The X-ray photoelectron spectroscopy (XPS) results demonstrate that the Cr(VI) removal mechanism by the aniline-<i>p</i>-phenylenediamine copolymer is a redox reaction. The positive value of Δ<i>H</i>° and negative value of Δ<i>G</i>° affirm that the Cr(VI) removal process by aniline-<i>p</i>-phenylenediamine copolymer is endothermic, thermodynamically achievable, and spontaneous. |
| format | Article |
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| publishDate | 2024-11-01 |
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| spelling | doaj-art-d04ae552aa794b12ac5a60b5bdaaa5782025-08-20T01:53:56ZengMDPI AGSeparations2297-87392024-11-01111132710.3390/separations11110327Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from WastewaterYifeng Li0Jingyue Chen1Xiwei Tan2Han Lou3Hongbo Gu4Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, ChinaYangtze Memory Technologies Co., Ltd., Wuhan 430070, ChinaShanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, ChinaHexavalent chromium, one of the heavy metal pollutants in water, harms the ecological environment and human health. In this work, an aniline-<i>p</i>-phenylenediamine copolymer has been prepared by chemical oxidative polymerization to remove the hexavalent chromium (Cr(VI)) from wastewater. The results show that when the initial Cr(VI) concentration is 1.5 mg·L<sup>−1</sup>, the removal percentage (RP%) of Cr(VI) could reach 94.84% after 180 s of treatment. The RP% of Cr(VI) increases with the dosage of copolymers and decreases with an increase in the initial Cr(VI) concentration. Additionally, the RP% of Cr(VI) removal reaches a maximum of 97.70% with a pH value of 1.0. The Cr(VI) removal kinetics of the copolymers follows a pseudo-first-order chemical reaction model. The X-ray photoelectron spectroscopy (XPS) results demonstrate that the Cr(VI) removal mechanism by the aniline-<i>p</i>-phenylenediamine copolymer is a redox reaction. The positive value of Δ<i>H</i>° and negative value of Δ<i>G</i>° affirm that the Cr(VI) removal process by aniline-<i>p</i>-phenylenediamine copolymer is endothermic, thermodynamically achievable, and spontaneous.https://www.mdpi.com/2297-8739/11/11/327aniline-<i>p</i>-phenylenediamine copolymerhexavalent chromiumheavy metal treatmentredox mechanism |
| spellingShingle | Yifeng Li Jingyue Chen Xiwei Tan Han Lou Hongbo Gu Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater Separations aniline-<i>p</i>-phenylenediamine copolymer hexavalent chromium heavy metal treatment redox mechanism |
| title | Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater |
| title_full | Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater |
| title_fullStr | Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater |
| title_full_unstemmed | Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater |
| title_short | Aniline-<i>p</i>-Phenylenediamine Copolymer for Removal of Hexavalent Chromium from Wastewater |
| title_sort | aniline i p i phenylenediamine copolymer for removal of hexavalent chromium from wastewater |
| topic | aniline-<i>p</i>-phenylenediamine copolymer hexavalent chromium heavy metal treatment redox mechanism |
| url | https://www.mdpi.com/2297-8739/11/11/327 |
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