Review article Open Access
Carbon Nanotubes from Carbon Dioxide
N B Singh *
RTDC, Sharda University, Greater Noida, India
*Corresponding author: N B Singh, RTDC, Sharda University, Greater Noida, India,E-mail: @
Received: May 9, 2018; Accepted: May 17, 2018; Published: May 18, 2018
Citation: N B Singh (2018) Carbon Nanotubes from Carbon Dioxide. Nanosci Technol 5(1): 1-3.
DOI: 10.15226/2374-8141/5/1/00154
Green house gas emission particularly emission of CO2 is a major issue in global warming. Numbers of methods are known to convert CO2 into useful product. However, recently conversion of CO2 into CNT is reported. The information is given in this short article.
Global warming and global climate changes are due to anthropogenic activities throughout the world [1]. Emissions of greenhouse gases particularly CO2 gas are responsible for greenhouse effect [2]. CO2 emissions by different sectors are given in

Figure 1 [3]. Surface temperature is increasing continuously. Therefore, there is an urgent need to develop technologies that will reduce CO2 emissions.

The easiest way to reduce CO2 concentrations is to reduce CO2 emissions through cleaner and more environmentally friendly industrial processes. However, it is not possible in near future. However, there are many ways to reduce CO2 by converting into number of useful products (Figure 2).

One of the most important nanomaterials is carbon Nanotubes, which can be made from CO2. There are two types of carbon Nanotubes (Single and double walled carbon nanotubes) (Figure 3). Carbon Nanotubes (CNTs) have been extensively studied due to their unique mechanical, electronic, and thermal properties
Figure 1: CO2 emissions in 2011
Figure 2: Utilization of CO2
Figure 3: Carbon Nanotubes
There are number of methods for the synthesis of carbon Nanotubes but the most exciting and new is that by CO2 [3]. Numerous CO2 transformation strategies have been proposed to produce CNTs, porous carbon, and graphene using supercritical CO2 or dry ice [4,5,6].

Li2CO3 with trace concentrations of Ni, Cu, Fe or Co dissolve CO2 to produce CNTs. Figure 4 shows a two chamber where electrolysis and CO2 dissolution occurs [7,8].

CNTs production by electrolysis in lithium carbonate occurs with the production of oxygen and lithium oxide:

Li2CO3 (liquid) ® C (CNT) + Li2O (dissolved) + O2 (gas) (1)
Li2CO3 consumed in Eq.1 is continuously compensated by

Li2O (dissolved) + CO2 (gas) ® Li2CO3 (liquid) (2)
Net reaction (combining Eqs (1) and (2)):
CO2 (gas) ® C(CNT) + O2(gas)

Thus from the above reactions CO2 produced is continuously being consumed to give CNT. This is entirely new and novel process for converting CO2 into CNT. If this process is commercialized, there will be a breakthrough in global warming.

CNT synthesized using CO2 is shown in Figure 5 [7,8].
Figure 4: CO2 to CNT transformation
Figure 5: Synthesis of carbon nanotubes from CO2 in molten lithium carbonate.
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