A Step towards Application of Nanoparticles in Environmental Remediation
count: [2016-11-30]

Recently, the workgroup from the environmental radiochemistry of Plasma Application Division, ASIPP made advances on the interaction mechanism of Th(IV) and graphene oxide-based composites. 

The team led by Dr Yubing Sun synthesized amidoxime/graphene oxide composites by adding iminodiacetonitrile into graphene oxide solutions under magnetic stirring conditions. The batch experiments indicated that amidoxime/graphene oxide composites presented high effective adsorption capacity for Th(IV), and then the interaction mechanism was demonstrated by surface complexation modeling and extended X-ray absorption fine structure (EXAFS) spectra. 

The mining, milling and transport could lead to the contamination of radionuclides. These radionuclides could bring a variety of potential threats for human health due to their radioactivity, toxicity and bioaccumulation. In recent years, researchers have extensively investigated the adsorption of radionuclides on various adsorbents such as clay minerals, metal (hydr)oxides and nanoparticles. However, the low adsorption capacities of these adsorbents could limit their practical application.

Dr Sun’s research found that amidoxime/graphene oxide composites presented the high effective adsorption capacity for Th(IV) (the maximum adsorption capacity = 123.46 mg/g at pH 2.0), indicating that amidoxime/graphene oxide composites can be used as the high efficient adsorbents for removal of radionuclides from aqueous solutions. These findings are crucial for the further understanding of interaction mechanism of radionuclide and graphene oxide-based composites, which is significant for the potential application of nanoparticles in environmental remediation.

The relevant result was published in Environmental Science: Nano (DOI: 10.1039/C6EN00470A) under the heading of “Mechanistic insights on the decontamination of Th(IV) on graphene oxide-based composites by EXAFS and modeling techniques”. (WANG Ying reports)

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The surface complexation modeling of Th(IV) on amidoxime/graphene oxide composites by using diffuse layer model