Selective functionalization of multiwalled carbon nanotubes (MWNTs) is essential for many prospective applications of such materials. In the present study, MWNTs grown by chemical vapor deposition are functionalized by ozone treatment at room temperature. Through this environmental and effective functionalization method, the chemical reactivity of MWNTs can be altered and tuned. Ozone functionalized MWNTs (F-MWNTs) were characterized by Raman spectroscopy, SEM, EDS, BET surface area, XPS, and FTIR. The results obtained confirm the formation of oxygen groups attached to the surface of ozone-treated nanotubes (e.g. carboxyl), which modify their physicochemical properties and boost the surface reactivity. The F-MWNT filters showed 99.5% manganese removal efficiency at 20 ppm concentration in the solution, which is higher than the efficiency reported earlier. The optimal parameters for Mn adsorption by F-MWNTs were studied. Possible mechanisms of F-MWNT adsorption processes are also...

中文翻译：

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臭氧对多壁碳纳米管的表面功能化及其在环境中的应用

多壁碳纳米管（MWNT）的选择性功能化对于此类材料的许多预期应用至关重要。在本研究中，通过化学气相沉积生长的MWNT在室温下通过臭氧处理功能化。通过这种环境有效的功能化方法，可以改变和调整MWNT的化学反应性。通过拉曼光谱，SEM，EDS，BET表面积，XPS和FTIR对臭氧功能化的MWNT（F-MWNT）进行了表征。获得的结果证实了附着在臭氧处理的纳米管（例如羧基）表面的氧基团的形成，这会改变其理化性质并提高表面反应性。F-MWNT过滤器在溶液中浓度为20 ppm时显示出99.5％的除锰效率，高于先前报道的效率。研究了F-MWNTs吸附Mn的最佳参数。F-MWNT吸附过程的可能机理也...