Removal of heavy metal ions from aqueous solutions with multi-walled carbon nanotubes: Kinetic and thermodynamic studies

2012 ◽  
Vol 10 (4) ◽  
pp. 677-688 ◽  
Author(s):  
M. Abdel Salam
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Thermodynamic Studies ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Kinetic And Thermodynamic Studies

scholarly journals Kinetic Study on the Heavy Metal Ions Removal from Aqueous Solutions Using Multi-Walled Carbon Nanotubes

2016 ◽  
Vol 65 ◽  
pp. 64-70
Author(s):  
Jun Jie Chen ◽  
Bao Fang Liu
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Kinetic Study ◽  
Heavy Metal Ions ◽  
Anodic Stripping Voltammetry ◽  
Solution Temperature ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Kinetic study on the removal of zinc(II), copper(II), lead(II) and cadmium(II) from the aqueous solutions using multi-walled carbon nanotubes (MWNTs) was carried out to examine the temperature effect on the adsorption of zinc(II), copper(II), lead(II) and cadmium(II) as well as to explore the potentiality of using carbon nanotubes as a promising adsorbent for environmental remediation. Multi-walled carbon nanotubes were characterized by BET (Brunauer-Emmett-Teller), FE-SEM (Field emission scanning electron microscopy), and DPASV (differential pulse anodic stripping voltammetry). Adsorption experiments were carried out and comparisons with the previous work were made. Experimental results showed that the multi-walled carbon nanotubes can successfully remove zinc(II), copper(II), lead(II) and cadmium(II) from aqueous solutions. Increasing solution temperature can significantly improve the removal efficiency because of the endothermic nature of adsorption process. The kinetics of zinc(II), copper(II), lead(II) and cadmium(II) adsorption on multi-walled carbon nanotubes were analyzed, and the calculation results showed that the heavy metal ions adsorption is a pseudo-second-order process, and its capacity increases with increasing solution temperature. The binding of the metal ions by the multi-walled carbon nanotubes was evaluated from the adsorption capacities and found in the following order: copper(II) > lead(II) > zinc(II) > cadmium(II). Finally, multi-walled carbon nanotubes demonstrated that they are a promising adsorbent for the removal of heavy metal ions from aqueous solutions.

Removal of heavy metal ions from wastewaters using dendrimer-functionalized multi-walled carbon nanotubes

2017 ◽  
Vol 24 (17) ◽  
pp. 14735-14747 ◽  
Author(s):  
Daniela Iannazzo ◽  
Alessandro Pistone ◽  
Ida Ziccarelli ◽  
Claudia Espro ◽  
Signorino Galvagno ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Increased Adsorption of Heavy Metal Ions in Multi-Walled Carbon Nanotubes with Improved Dispersion Stability

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3106
Author(s):  
Carolina Rodríguez ◽  
Sebastián Briano ◽  
Eduardo Leiva
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Column Experiments ◽  
Acidic Solutions ◽  
Mechanical Dispersion ◽  
Removal Of Heavy Metals ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In recent years, carbon nanotubes (CNTs) have been intensively studied as an effective adsorbent for the removal of pollutants from wastewater. One of the main problems for its use corresponds to the agglomeration of the CNTs due to the interactions between them, which prevents using their entire surface area. In this study, we test the effect of dispersion of oxidized multi-walled carbon nanotubes (MWCNTs) on the removal of heavy metals from acidic solutions. For this, polyurethane filters were dyed with a well-dispersed oxidized MWCNTs solution using chemical and mechanical dispersion methods. Filters were used in column experiments, and the sorption capacity increased more than six times (600%) compared to experiments with suspended MWCNTs. Further, kinetic experiments showed a faster saturation on MWCNTs in column experiments. These results contribute to a better understanding of the effect of dispersion on the use of CNTs as heavy metal ions adsorbent.

scholarly journals Effects of Anions on Adsorption of Trace Levels of Cu(II), Pb(II) and Cr(VI) by Amino-Functionalized Multi-Walled Carbon Nanotubes

2017 ◽  
Vol 68 (2) ◽  
pp. 362-368 ◽  
Author(s):  
Aleksandra Sucurovic ◽  
Jelena Trickovic ◽  
Snezana Maletic ◽  
Marijana Kragulj Isakovski ◽  
Akos Kukovecz ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Process ◽  
Chemical Interaction ◽  
Multiwalled Carbon ◽  
Intra Particle Diffusion ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This work studies the adsorption of heavy metal ions (Cu(II), Pb(II) and Cr(VI)) in aqueous solutions on amino-functionalized multiwalled carbon nanotubes (MWCNTs-NH2) in the ppb concentration range (50-3000 �g/l) as a function of contact time, initial concentration of heavy metal ions and the presence of four inorganic electrolyte anions (Cl-, SO42-, NO3-, PO43-). The adsorption of heavy metals from aqueous solution was studied using different kinetic models. The results showed that the adsorption process is best fitted with the pseudo-second-order model indicating that the process is controlled by chemisorptions through electrostatic attraction and chemical interaction/complexation between the metal ions and the surface functional groups of MWCNTs-NH2. The intra-particle diffusion model showed that diffusion is slow, but did not govern the rate of the overall adsorption process. The effects of Cl-, SO42-, NO3- and PO43- anions on the adsorption of Cu(II), Pb(II) and Cr(VI) are variable (improvement, reduction, no impact).

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