Nano chromium embedded in f-CNT supported CoBi-LDH nanocomposites for selective adsorption of Pb2+and hazardous organic dyes
| Autor: | Yahiya Kadaf Manea, Amjad Mumtaz Khan, Ajaz Ahmad Wani, Mansour A.S. Salem |
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| Rok vydání: | 2022 |
| Předmět: |
Langmuir
Environmental Engineering Materials science Sorbent Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Layered double hydroxides chemistry.chemical_element Langmuir adsorption model General Medicine General Chemistry engineering.material Pollution Chromium symbols.namesake Adsorption chemistry Selective adsorption engineering symbols Environmental Chemistry Freundlich equation Nuclear chemistry |
| Zdroj: | Chemosphere. 289:133073 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2021.133073 |
| Popis: | Transition metal ions –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/Cr@CNT 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 Pb+2and 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 Pb+2 pollutants were (278.4 mg g−1), (164.6 mg g−1) and (503.2 mg g−1) and the removal efficiency achieved were 98.2%,95.0% and 100% respectively. The selectivity of CoBi-LDH/Cr@CNT nanocomposite towards Pb+2 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+ (0.992), RB (0.996), and CR (0.997).The results demonstrated that the synthesized CoBi-LDH/Cr@CNT nanocomposite can be used as an effective sorbent for the removal of disinfection from polluted water. |
| Databáze: | OpenAIRE |
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