Investigation of U(VI), Th(IV), and Eu(III) ions’ sorption behavior onto silica gel modified with anhydride

Autor:	Lijuan Qian, Yi Zhong, Suwen Chen, Wenya Tai, Qiang Shan, Tonghuan Liu, Zhiwei Lei, Yu Nan, Peizhuo Hu
Rok vydání:	2019
Předmět:	Aqueous solution Sorbent Chemistry Silica gel Health Toxicology and Mutagenesis Enthalpy Potentiometric titration Public Health Environmental and Occupational Health Langmuir adsorption model Sorption 010403 inorganic & nuclear chemistry 01 natural sciences Pollution 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound symbols.namesake Adsorption Nuclear Energy and Engineering symbols Radiology Nuclear Medicine and imaging Spectroscopy Nuclear chemistry
Zdroj:	Journal of Radioanalytical and Nuclear Chemistry. 321:733-745
ISSN:	1588-2780 0236-5731
DOI:	10.1007/s10967-019-06636-0
Popis:	Modification of silica gel by butanedioic anhydride (SiO2–BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO2–BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO2–BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10−5, 5.06 × 10−5, and 3.44 × 10−5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO2–BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
Databáze:	OpenAIRE
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