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Radionuclide extraction from wastewater is a long-term process, in which the study on the reuse and decomposition of adsorbents provides the ability to complete the post-treatment after adsorption. Herein, A novel biodegradable amidoxime chitosan has been synthesized through one-step without crosslinking agent and characterized by FT-IR, SEM, XPS, TGA and element analysis. The batch adsorption experiments of U(VI) and Th(IV) on AO-CTS adsorbent were studied and maximum adsorption of U(VI) and Th(IV) were 97 and 56 mg/g, respectively. The U(VI) and Th(Ⅳ) can be effectively desorbed from the AO-CTS materials at low acidity, The AO-CTS can be reused 6 times without reducing absorbency for U(VI) and Th(Ⅳ). When finish the adsorption process, the AO-CTS can be degraded by lysozyme at room temperature, there were no toxic or harmful substances are produced. [ABSTRACT FROM AUTHOR]

Fossil fuels are the major energy source used in the world and will continue to dominate in the future. For the coal-dependent countries, the key to the emission reduction of CO2 will be the capture of CO2 in coal-fired power plants. Currently available CO2 sorbents are reviewed in this paper. Based on the principles of various separation technologies, absorption and adsorption are discussed accordingly. In terms of the application temperature, absorption materials are categorized into high-temperature absorbent and low-temperature absorbent and their latest progress are included. For the adsorption, different materials such as activated carbon, zeolite and MOFs and etc. are discussed thoroughly. At the end, the future trend of CO2 separation is proposed. It is suggested that since any single method cannot meet the requirements of coal-fired power plants, feasible approach for CO2 separation will be to combine the advantages of all the available methods, for example, adsorbents impregnated with amines, porous polymer impregnated with organic solvents and new structured adsorbents such as ionic liquids and metal organic frames. [ABSTRACT FROM AUTHOR]