Carbon Nanotubes as a New Solid Phase Extraction Sorbent for Analysis of Environmental Pollutants

Part of book or chapter of book English OPEN
Constantin, Bele (2010)
  • Publisher: InTech

SPE is an increasingly useful technique for sample concentration and clean-up in environmental applications and can be easily incorporated into automated analytical procedures. The future of SPE is closely related to improvement of sorbents that can be more effective in obtaining high enrichment efficiency of analytes. The unusual properties of CNTs, their large sorption capacity, wide surface area and the presence of a wide spectrum of surface functional groups have generated a great interest in their use as sorbent materials in a wide variety of analytical processess. The presence of the inner cavities, active sites on the surface and internanotube space can contribute to the high pollutants removal capability of CNTs. In several comparative studies the results showed that CNTs were more effective than or as effective as other commonly used adsorbents such as C 18 bonded silica, activated carbon or macroporous resins. It was reported that CNTs may be re-used more than 100 times after proper cleaning and reconditioning (Pyrzynska et al., 2008). Carbon nanotubes have excellent adsorption ability for many kinds of substances such as inorganic and organic compounds (particularly those containing benzene rings) but lesser selectivity. It still needs to explore new chemical functionalization of CNTs to increase its
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