Nano chromium embedded in f-CNT supported CoBi-LDH nanocomposites for selective adsorption of Pb 2+ and hazardous organic dyes

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/Cr@CNT composites were successfully synthesized by hydrothermal r...

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Bibliographic Details
Published inChemosphere (Oxford) Vol. 289; p. 133073
Main Authors Salem, Mansour A S, Khan, Amjad Mumtaz, Manea, Yahiya Kadaf, Wani, Ajaz Ahmad
Format Journal Article
LanguageEnglish
Published England 01.02.2022
Subjects
Adsorption
Chromium - analysis
Coloring Agents
Hydrogen-Ion Concentration
Kinetics
Lead
Nanocomposites
Water Pollutants, Chemical - analysis
Dyes
Adsorption
Carbon nanotubes
CoBi-LDH
Nanocomposite
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Summary: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/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 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 Pb pollutants were (278.4 mg g ), (164.6 mg g ) and (503.2 mg g ) and the removal efficiency achieved is 98.2%, 95.0% and 100% respectively. The selectivity of CoBi-LDH/Cr@CNT nanocomposite towards Pb has been studied using ICP-AES.The isothermal results were analyzed using Freundlich and Langmuir models. Adsorption isotherm for Pb (R  = 0.975), RB (R  = 0.997) and CR (R  = 0.992) agrees with the Langmuir model indicating monolayer adsorption. The sorption kinetics data well fitted pseudo-first-order model for Pb (R  = 0.975), RB (R  = 0.996), and CR (R  = 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.
ISSN:1879-1298