By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Chalcogens have been published. According to news originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "The effects of different outer diameters and surface oxygen contents on the adsorption of heavy metals onto six types of multi-walled carbon nanotubes (MWCNTs) were investigated in an aqueous solution and lead was chosen as a model metal ion. The results indicated that the percentage removal and adsorption capacity of lead remarkably increased with decreasing outer diameter due to larger specific surface area (SSA)."
Our news journalists obtained a quote from the research from Shanghai Jiao-Tong University, "The SSA-normalized maximum adsorption capacity (qmSSA) and SSA-normalized adsorption coefficient (Kd/SSA) were strongly positively correlated with surface oxygen content, implying that lead adsorption onto MWCNTs significantly increases with the rise of oxygen content and decreases with decreasing SSA. The calculated thermodynamic parameters indicated that adsorption of lead on MWCNTs was endothermic and spontaneous. When the oxygen content of MWCNTs increased from 2.0% to 5.9%, the standard free energy (deltaG0) became more negative, which implied that the oxygenated functional groups increased the adsorption affinity of MWCNTs for lead. Through calculation of enthalpy (deltaH0), deltaG0 and free energy of adsorption (Ea), lead adsorption onto MWCNTs was recognized as a chemisorption process."
According to the news editors, the research concluded: "The chemical interaction between lead and the phenolic groups of MWCNTs could be one of the main adsorption mechanisms due to highly positive correlations between the phenolic groups and Kd/SSA or qm/SSA."
For more information on this research see: Adsorption of lead on multi-walled carbon nanotubes with different outer diameters and oxygen contents: kinetics, isotherms and thermodynamics. Journal of Environmental Sciences, 2013;25(1):195-203. Journal of Environmental Sciences can be contacted at: IOS Press, Nieuwe Hemweg 6B, 1013 BG Amsterdam, The Netherlands. (Elsevier - www.elsevier.com; Journal of Environmental Sciences - www.elsevier.com/wps/product/cws_home/709941)
The news correspondents report that additional information may be obtained from F. Yu, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Taiwan. Additional authors for this research include Y. Wu, J. Ma and C. Zhang (see also Chalcogens).
The publisher's contact information for the Journal of Environmental Sciences is: IOS Press, Nieuwe Hemweg 6B, 1013 BG Amsterdam, The Netherlands.
Keywords for this news article include: Asia, Physics, Shanghai, Chalcogens, Fullerenes, Nanotechnology, Thermodynamics, Carbon Nanotubes, Emerging Technologies, People's Republic of China.
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