Nano chromium embedded in f-CNT supported CoBi-LDH nanocomposites for selective adsorption of Pb2+and hazardous organic dyes
Copyright © 2021 Elsevier Ltd. All rights reserved..
Transition metal-doped carbon-coated layered double hydroxides for the removal of lead (II) and hazardous organic dyes have attracted increasing attention for wastewater treatment in recent years. In this work, nanostructured CoBi-LDH/CrCNT composites were successfully synthesized by hydrothermal route. The CoBi-LDH/Cr@CNT was characterized by instrumental techniques such as XRD, FTIR, TEM, SEM, XPS and TGA/DTA. Adsorption of Pb2+ and organic dyes, i.e.,Rose Bengal (RB) and Congo red (CR) by CoBi-LDH/Cr@CNT was performed by batch experiment.The effect of several parameters including contact time, adsorbent dose, pH, temperature, and concentration was also investigated. Under optimum conditions, the adsorption capacity of CoBi-LDH/Cr@CNT for RB, CR and Pb2+ pollutants were (278.4 mg g-1), (164.6 mg g-1) and (503.2 mg g-1) and the removal efficiency achieved is 98.2%, 95.0% and 100% respectively. The selectivity of CoBi-LDH/Cr@CNT nanocomposite towards Pb2+ has been studied using ICP-AES.The isothermal results were analyzed using Freundlich and Langmuir models. Adsorption isotherm for Pb2+(R2 = 0.975), RB (R2 = 0.997) and CR (R2 = 0.992) agrees with the Langmuir model indicating monolayer adsorption. The sorption kinetics data well fitted pseudo-first-order model for Pb2+ (R2 = 0.975), RB (R2 = 0.996), and CR (R2 = 0.995).The results demonstrated that the synthesized CoBi-LDH/Cr@CNT nanocomposite can be used as an effective sorbent for the removal of pollutants from wastewater.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:289 |
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| Enthalten in: |
Chemosphere - 289(2022) vom: 05. Feb., Seite 133073 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Salem, Mansour A S [VerfasserIn] |
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| Links: |
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| Themen: |
0R0008Q3JB |
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| Anmerkungen: |
Date Completed 11.01.2022 Date Revised 11.01.2022 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.chemosphere.2021.133073 |
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NLM333980034 |
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| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2021 Elsevier Ltd. All rights reserved. | ||
| 520 | |a Transition metal-doped carbon-coated layered double hydroxides for the removal of lead (II) and hazardous organic dyes have attracted increasing attention for wastewater treatment in recent years. In this work, nanostructured CoBi-LDH/CrCNT composites were successfully synthesized by hydrothermal route. The CoBi-LDH/Cr@CNT was characterized by instrumental techniques such as XRD, FTIR, TEM, SEM, XPS and TGA/DTA. Adsorption of Pb2+ and organic dyes, i.e.,Rose Bengal (RB) and Congo red (CR) by CoBi-LDH/Cr@CNT was performed by batch experiment.The effect of several parameters including contact time, adsorbent dose, pH, temperature, and concentration was also investigated. Under optimum conditions, the adsorption capacity of CoBi-LDH/Cr@CNT for RB, CR and Pb2+ pollutants were (278.4 mg g-1), (164.6 mg g-1) and (503.2 mg g-1) and the removal efficiency achieved is 98.2%, 95.0% and 100% respectively. The selectivity of CoBi-LDH/Cr@CNT nanocomposite towards Pb2+ has been studied using ICP-AES.The isothermal results were analyzed using Freundlich and Langmuir models. Adsorption isotherm for Pb2+(R2 = 0.975), RB (R2 = 0.997) and CR (R2 = 0.992) agrees with the Langmuir model indicating monolayer adsorption. The sorption kinetics data well fitted pseudo-first-order model for Pb2+ (R2 = 0.975), RB (R2 = 0.996), and CR (R2 = 0.995).The results demonstrated that the synthesized CoBi-LDH/Cr@CNT nanocomposite can be used as an effective sorbent for the removal of pollutants from wastewater | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Adsorption | |
| 650 | 4 | |a Carbon nanotubes | |
| 650 | 4 | |a CoBi-LDH | |
| 650 | 4 | |a Dyes | |
| 650 | 4 | |a Nanocomposite | |
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| 700 | 1 | |a Khan, Amjad Mumtaz |e verfasserin |4 aut | |
| 700 | 1 | |a Manea, Yahiya Kadaf |e verfasserin |4 aut | |
| 700 | 1 | |a Wani, Ajaz Ahmad |e verfasserin |4 aut | |
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