ZIF-67 grafted-boehmite-PVA composite membranes with enhanced removal efficiency towards Cr(VI) from aqueous solutions
Copyright © 2023 Elsevier Ltd. All rights reserved..
In this work, we developed a thin membrane of boehmite-polyvinyl alcohol composite (BOPOM) (diameter ∼ 5 cm) grafted ZIF-67 combing sol-gel and in-situ growth methods. The fabricated materials were characterized using FT-IR, SEM, XRD, TGA, XPS, and N2 sorption techniques. Results indicate that ZIF-67 nanocrystals were well-grafted into the AlOOH-PVA matrix with reduced crystallite size. Furthermore, the decorated ZIF-67 offered additional porous structures and adsorption sites onto the membrane, enhancing their removal efficiency towards Cr6+ compared to the undecorated and pristine ZIF-67. At pH ∼5.5, the harvested ZIF-67/BOPOM exhibited the highest Cr6+ uptake capacity of ∼56.4 mg g-1. Kinetic studies showed that the chromium adsorption on the prepared materials obeyed the pseudo-second-order model, and the kinetic parameters followed the order ZIFF-67/BOPOM (0.020 mg g-1 min-1) > BOPOM (0.011 mg g-1 min-1) > ZIF-67 (0.006 mg g-1 min-1). Notably, the adsorption mechanism study revealed that adsorbed Cr6+ was reduced to Cr3+, and the reduction yield was boosted owing to grafting ZIF-67 into the BOPOM. In addition, the fabricated ZIF-67/BOPOM can simultaneously remove Cr6+ and methyl orange dye (MO) in the solution due to their synergetic effects on each other. Furthermore, the hybrid membrane ZIF-67/BOPOM showed a chromium removal efficiency of ∼78.2% after four successive adsorption-desorption cycles. This study indicates that grafting nanocrystals ZIF-67 onto the super-platform boehmite-PVA is a promising strategy to harvest an adsorbent with a high adsorption ability, cost-effectiveness, and reduced secondary pollution risks.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:341 |
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| Enthalten in: |
Chemosphere - 341(2023) vom: 25. Nov., Seite 139996 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Vo, The Ky [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 27.09.2023 Date Revised 27.09.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.chemosphere.2023.139996 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM361460309 |
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| 245 | 1 | 0 | |a ZIF-67 grafted-boehmite-PVA composite membranes with enhanced removal efficiency towards Cr(VI) from aqueous solutions |
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| 500 | |a published: Print-Electronic | ||
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| 520 | |a Copyright © 2023 Elsevier Ltd. All rights reserved. | ||
| 520 | |a In this work, we developed a thin membrane of boehmite-polyvinyl alcohol composite (BOPOM) (diameter ∼ 5 cm) grafted ZIF-67 combing sol-gel and in-situ growth methods. The fabricated materials were characterized using FT-IR, SEM, XRD, TGA, XPS, and N2 sorption techniques. Results indicate that ZIF-67 nanocrystals were well-grafted into the AlOOH-PVA matrix with reduced crystallite size. Furthermore, the decorated ZIF-67 offered additional porous structures and adsorption sites onto the membrane, enhancing their removal efficiency towards Cr6+ compared to the undecorated and pristine ZIF-67. At pH ∼5.5, the harvested ZIF-67/BOPOM exhibited the highest Cr6+ uptake capacity of ∼56.4 mg g-1. Kinetic studies showed that the chromium adsorption on the prepared materials obeyed the pseudo-second-order model, and the kinetic parameters followed the order ZIFF-67/BOPOM (0.020 mg g-1 min-1) > BOPOM (0.011 mg g-1 min-1) > ZIF-67 (0.006 mg g-1 min-1). Notably, the adsorption mechanism study revealed that adsorbed Cr6+ was reduced to Cr3+, and the reduction yield was boosted owing to grafting ZIF-67 into the BOPOM. In addition, the fabricated ZIF-67/BOPOM can simultaneously remove Cr6+ and methyl orange dye (MO) in the solution due to their synergetic effects on each other. Furthermore, the hybrid membrane ZIF-67/BOPOM showed a chromium removal efficiency of ∼78.2% after four successive adsorption-desorption cycles. This study indicates that grafting nanocrystals ZIF-67 onto the super-platform boehmite-PVA is a promising strategy to harvest an adsorbent with a high adsorption ability, cost-effectiveness, and reduced secondary pollution risks | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Adsorption | |
| 650 | 4 | |a Boehmite | |
| 650 | 4 | |a Composite membrane | |
| 650 | 4 | |a Cr(VI) | |
| 650 | 4 | |a Polyvinyl alcohol | |
| 650 | 4 | |a Reduction | |
| 650 | 4 | |a ZIF-67 | |
| 650 | 7 | |a chromium hexavalent ion |2 NLM | |
| 650 | 7 | |a 18540-29-9 |2 NLM | |
| 650 | 7 | |a aluminum oxide hydroxide |2 NLM | |
| 650 | 7 | |a 63957-70-0 |2 NLM | |
| 650 | 7 | |a Chromium |2 NLM | |
| 650 | 7 | |a 0R0008Q3JB |2 NLM | |
| 650 | 7 | |a Water |2 NLM | |
| 650 | 7 | |a 059QF0KO0R |2 NLM | |
| 650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
| 700 | 1 | |a Phuong, Nguyen Hoang Yen |e verfasserin |4 aut | |
| 700 | 1 | |a Nguyen, Van Cuong |e verfasserin |4 aut | |
| 700 | 1 | |a Quang, Duong Tuan |e verfasserin |4 aut | |
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| 773 | 1 | 8 | |g volume:341 |g year:2023 |g day:25 |g month:11 |g pages:139996 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1016/j.chemosphere.2023.139996 |3 Volltext |
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