Irradiation Properties Of Two Carbon Nanomaterials And Their Adsorption Behaviors On Th(â…£) And Eu(â…¢)

As well known, porous nanomaterials had attracted increasing attention recent years. First, the adsorption capacity of carbon nanotubes have been studied. The influences of contact time, ionic strength, pH, solid-liquid ratio, temperature and C60(C(COOH)2)n on Th(IV) adsorption onto the magnetic multi-walled carbon nanotubes (MMWCNTs) were studied by batch technique. The dynamic process showed that the adsorption of Th(IV) onto MMWCNTs could reach equilibrium in 40 h and matched the pseudo-second-order kinetics model. The ionic strength has no influence on the adsorption. The adsorption of Th(IV) onto MMWCNTs was significantly dependent on pH values, the adsorption ratio increased markedly at pH 3.0-5.0, and then maintained a steady state as pH values increased. At low pH, C60(C(COOH)2)n could enhance the adsorption content of Th(â…£) onto MMWCNTs, but restrained it at higher pH. Through simulating the adsorption isotherms by Langmuir, Freundlich and Dubini-Radushkevich models, it could be seen respectively that the adsorption pattern of Th(IV) onto MMWCNTs was mainly surface complexation. And that the adsorption processes were endothermic and irreversible with and without C6o(C(COOH)2)n.Graphene is another kind of carbon nanomaterials. And graphene-retated materials such as porous graphene were studied both experimentally and theoretically widely, almost all researches were focused on multifunctional membrances, nanoelectronics, bio-applications, supercapacitors or others. Consequently, in order to understand the differences between porous graphene and normal graphene at catalytic property and adsorption, in this experiment, with the removal of organic matter (gallic acid) and metal ion (152Eu(â…¢)), and the reduction of 4-nitrophenol (4-NP) by NaBH4 as a model reaction, a systematic investigation into the adsorptive performance as well as catalytic activity of graphene with or without electron beam irradiation exposure had been carried out. And as the results showed, compared with the reduction of pristine graphene oxidized (R-GO), the reduction of graphene oxidized with electron beam irradiation exposure (100 MGy, about 2 hours, R-RGO) had many irregular defects for the lack of atoms; the adsorptive performance of the R-RGO increased for metals but that decreased for organic matter, however, the adsorption rate of the R-RGO was lower for metals, but higher for organic matter than that of the R-GO. In addition, the results also showed that the R-RGO had a better catalytic capacity than the R-GO.