Removal of thorium from aqueous solution by adsorption with Cu 3 (BTC) 2
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Removal of thorium from aqueous solution by adsorption with Cu3(BTC)2 Ke Hu1,3 · Zhirong Liu1,2 · Taoyuan Xiu1,3 · Limin Zhou1,2 · Yun Wang1,3 Received: 22 February 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The Cu3(BTC)2(BTC = 1,3,5-benzenetricarboxylic acid) was synthesized by water/solvent heat method. The C u3(BTC)2 was characterized by SEM/EDS, Zeta potential and XRD. Batch static adsorption experiments investigated the various factors affecting the adsorption of Th(IV) in aqueous solution such as pH, solid–liquid ratio, contact time, initial concentration and temperature, and the adsorption mechanism is also discussed. The adsorption process was in line with the pseudo-secondorder kinetic model and the Langmuir isotherm model. At the same time, compared with other adsorbents. The results showed that Cu3(BTC)2 had good adsorption for Th(IV) with a maximum adsorption of 757.58 mg g−1. Keywords Th(IV) · Cu3(BTC)2 · Adsorption · Organic metal frame
Introduction Thorium is more abundant and cheaper on earth than uranium. The abundance of thorium on earth is vast, almost as rich as lead, with a wealth of 9.6 mg kg−1, about three times that of uranium, all of which can be scientifically converted into nuclear energy [1]. With the development of nuclear energy, radioactive waste water has polluted the ecological environment, posing a massive threat to human health [2–5]. At present, the conventional enrichment methods for thorium-containing waste water mainly include adsorption [6], chemical precipitation [7], membrane separation [8] and ion exchange [9]. Adsorption method has shown more and more widen application space due to its advantages of simple operation, high pollutant removal efficiency and no pollution [10–12]. Therefore, the most urgent task is how to obtain excellent adsorbents [13–15]. Metal–organic framework is a kind of * Zhirong Liu [email protected] 1
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2
School of Chemistry, Biological and Materials Science, East China University of Technology, Nanchang 330013, China
3
School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China
self-assembled material with specific topological structure, which is composed of metal nodes and organic ligands. It has the advantages of large specific surface area, adjustable pore size, and controllable properties. It shows great potential in the field of waste water adsorption [2, 16–18]. Cu3(BTC)2 is an organic metal skeleton material with copper as the metal centre and trimesic acid as the ligand, which contains a large number of unsaturated metal bits. Because of its particular pore structure, high specific surface area and good thermal stability, it has excellent adsorption performance in removing radionuclides from waste water [19–21]. In this study, Cu3(BTC)2 was characterized by SEM/EDS, zeta potential and XRD. The adsorption properties of C u3(BTC)2 for Th(IV) were stu
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