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Research Papers: Energy Conversion/Systems

Carbon Nanotubes Used for Renewable Energy Applications and Environmental Protection/Remediation: A Review

[+] Author and Article Information
Kaufui V. Wong, Benoit Bachelier

University of Miami,
Coral Gables, FL 33146

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 17, 2013; final manuscript received June 21, 2013; published online September 19, 2013. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 136(2), 021601 (Sep 19, 2013) (8 pages) Paper No: JERT-13-1129; doi: 10.1115/1.4024917 History: Received April 17, 2013; Revised June 21, 2013

Carbon nanotubes are surprisingly ubiquitous in their use for renewable energy applications as well as for environmental protection and remediation. Hence, this is the motivation for the current review, to investigate into their usefulness. The characteristic properties of these nanotubes are a result of their large surface areas, and their unique mechanical, electrical, and chemical properties, and in no small part, due to its relatively easy manufacturability. Research has been done using carbon nanotubes for hydrogen storage, although it does not seem logical that carbon nanotubes would be very useful for this purpose. Carbon nanotubes used for solar collectors are used mainly for their improved thermal and electrical conductivities. Organic solar cells do not have a long life since they deteriorate in the sun. Research into long-lasting, yet inexpensive organic solar cells is an active area, and should continue to be so for some time. Carbon nanotubes are activated by certain chemicals. They may be used to react with solids, liquids, and gases. Hence, they are employed for waste water treatment, liquid, and gaseous cleanup. They may be used to remove metals as well as life pathogens. As the number of new pollutants and pathogens entering the environment multiply, research should continue to study the use of carbon nanotubes with regards prevention and remediation.

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References

Figures

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Fig. 1

The effect of the ph on percentage removal of lead at 150 rpm [43]

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Fig. 2

Effect of time on percentage removal of lead at [43]

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Fig. 3

Influences of pH on the recoveries of Cr(VI) on MWCNTs n = 3 [54]

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Fig. 4

Adsorption efficiency for Cr(VI) of CeO2/ACNTs (%) as a function of pH values (CI = 10.0 mg l−1 and 25  °C) [55]

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Fig. 5

Ni 2+ recoveries of sorbents under various n [56]

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Fig. 6

Sorption isotherms of Ni 2+ by SWCNT and MWCNT [57]

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Fig. 7

Effect of equilibrium concentration on the adsorption uptake of nickel ions for oxidized CNTs [59]

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Fig. 8

Effects of temperature on 15% CO2 adsorption via CNTs and various amine modified CNTs [69]

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Fig. 9

Comparison between carbon nanotube electrode and stainless steel electrode for removal efficiencies of E. coli bioaerosols by using corona discharge plasma [73]

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