scholarly journals Functionalized carbon nanotubes based filters for chromium removal from aqueous solutions

2017 ◽  
Vol 75 (7) ◽  
pp. 1564-1571 ◽  
Author(s):  
Emad M. Elsehly ◽  
N. G. Chechenin ◽  
A. V. Makunin ◽  
H. A. Motaweh ◽  
E. G. Leksina
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
High Performance ◽  
Diameter Distribution ◽  
Outer Diameter ◽  
Chromium Removal ◽  
Multiwalled Carbon

This investigation examines the filtration efficiency of chromium from aqueous solution using two types of commercial multiwalled carbon nanotubes (MWCNTs) (Taunit-M (TM) and Taunit-MD (TMD)). These MWCNTs were modified using two complementary treatments, purification (using a mixture of hydrochloric acid and hydrogen peroxide) and functionalization (using nitric acid). The effect of these treatments on the morphology of MWCNT Taunit filters was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy to estimate the outer diameter distribution and element content deposited on filters. Effects of different parameters, i.e., carbon nanotube filter mass, concentration of chromium in aqueous solution, and pH of aqueous solution, on removal of this heavy metal were determined. From these investigations, the removal efficiency of chromium could reach 97% for modified TM and 70% for modified TMD at concentration of 10 ppm, suggesting that modified TM is an excellent adsorbent for chromium removal from aqueous solutions and more efficient than modified TMD. A significant increase in chromium removal by modified TM at pH = 2 has been observed compared with higher pH values. It was found that modified TM filters can be reused through many cycles of regeneration with high performance. Modified TM filters may be a promising candidate for heavy metal ion removal from industrial wastewater.

Removal of iron and manganese from aqueous solutions using carbon nanotube filters

2015 ◽  
Vol 16 (2) ◽  
pp. 347-353 ◽  
Author(s):  
E. M. I. Elsehly ◽  
N. G. Chechenin ◽  
K. A. Bukunov ◽  
A. V. Makunin ◽  
A. B. Priselkova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Metal Ion ◽  
Diameter Distribution ◽  
Outer Diameter ◽  
Multiwalled Carbon ◽  
Metal Ion Removal ◽  
Heavy Metal Ion Removal

Carbon nanotubes (CNTs) have become the focus of attention of many scientists and companies worldwide. CNT-based filters have a prospective advantage in comparison to the commercial filters already in operation because they are light weight and do not require electricity to operate. This investigation handles the filtration efficiency of manganese and iron from aqueous solution using commercial multiwalled carbon nanotubes (MWCNTs) (Taunit). The effects of different parameters such as CNT filter mass, concentration of manganese and iron in aqueous solution and pH of aqueous solution on removal of these heavy metals are determined. From these investigations, the removal efficiency of manganese and iron could reach 71.5% and 52% respectively for concentration 50 ppm, suggesting that Taunit is an excellent adsorbent for manganese and iron removal from water. There was a significant increase in removal efficiency at pH = 3 for manganese and pH = 8 for iron. The effect of oxidation on the structural of MWCNTs was characterized by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) techniques to investigate the functionalization with oxygen-containing and outer diameter distribution. It was found that functionalized CNT-based filters are more efficient at removing manganese and iron from aqueous solutions. Oxidized MWCNTs may be a promising candidate for heavy metal ion removal from industrial wastewater.

Nitrogen-functionalised carbon nanotubes as a novel adsorbent for the removal of Cu(ii) from aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 2731-2745 ◽  
Author(s):  
Oluwaseun A. Oyetade ◽  
Vincent O. Nyamori ◽  
Bice S. Martincigh ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Functionalized Multiwalled Carbon Nanotubes

Nitrogen-functionalized multiwalled carbon nanotubes synthesized were effective and efficient for the removal of Cu2+ from aqueous solutions.

Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 69 (5) ◽  
pp. 1233-1239
Author(s):  
Raluca Madalina Senin ◽  
Ion Ion ◽  
Ovidiu Oprea ◽  
Rusandica Stoica ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Adsorption Process ◽  
Sorption Process ◽  
Multiwalled Carbon ◽  
Before And After ◽  
Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

Modulation of Electronic Properties of Single Wall Carbon Nanotubes by the Presence of an Ionic Shell

2006 ◽  
Vol 915 ◽  
Author(s):  
Vladimir Dobrokhotov ◽  
Chris Berven
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Band Structure ◽  
Metal Ion ◽  
Single Wall Carbon Nanotubes ◽  
Functionalized Carbon Nanotubes ◽  
Ion Sensing ◽  
Fixed Distance ◽  
Metal Ion Sensing ◽  
Heavy Metal Ion Sensing

AbstractWe report the change to the band structure of two types of carbon nanotubes due to the presence of an isolated, non-conducting, uniformly charged shell held at a fixed distance above their surfaces. We find that, depending on the chirality of the nanotube, the strain on the lattice causes the dispersion relationships to change. This change can result in a modification of the band structure which can induce a metal-semiconductor transition. We consider these effects as a possible mechanism for heavy-metal ion sensing by functionalized carbon-nanotubes.

Sign in / Sign up

Export Citation Format

Share Document