Adsorption of U(VI) onto the carboxymethylated chitosan/Na-bentonite membranes: kinetic, isothermic and thermodynamic studies

Autor:	Limin Zhou, Zhanggao Le, Adesoji A. Adesina, Jinbo Ouyang, Zhao Li, Hamza Shehzad
Rok vydání:	2018
Předmět:	Chemistry Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Sorption 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences Pollution Endothermic process 0104 chemical sciences Analytical Chemistry Chitosan chemistry.chemical_compound Adsorption Membrane Nuclear Energy and Engineering Chemisorption Bentonite Radiology Nuclear Medicine and imaging 0210 nano-technology Spectroscopy Nuclear chemistry
Zdroj:	Journal of Radioanalytical and Nuclear Chemistry. 317:1377-1385
ISSN:	1588-2780 0236-5731
Popis:	The carboxymethylated chitosan (CMC)/Na-bentonite (Na-Bt) composite membranes were prepared and throughly characterized. The Na-Bt/CMC mass ratio was optimized, and CB10 (membrane with Na-Bt/CMC mass ratio of 10%) was selected as the best membrane for U(VI) sorption. XPS analysis indicates that the main mechanism for UO22+ sorption onto CB10 is through inner-surface complexation. The sorption kinetics followed pseudo-second order model, indicating the chemisorption as the rate-controlling step. The U(VI) sorption on CB10 is endothermic and spontaneous, with the maximum mono-layer adsorption capacity of 115.6 mg/g at pH 5.0 and 298 K. Finally, the U(VI)-loaded CB10 can consecutively desorbed and reused for several cycles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5858879d695cc03536d82dd4c8792b96 https://doi.org/10.1007/s10967-018-6009-8 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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