Synthesis of a Mg-Cd-Al layered double hydroxide and sorption of selenium

Cambridge University Press (CUP) - Tập 57 Số 3 - Trang 330-337 - 2009
Bogi Hansen1, H. Curtius1, R. Odoj1
1Institute for Energy Research - Safety Research and Reactor Technology (IEF-6), Research Centre Jülich GmbH, Jülich, Germany

Tóm tắt

AbstractLeaching experiments with metallic uranium-aluminum research-reactor fuel elements in repository-relevant MgCl2-rich salt brine (brine 2) were performed. A Mg-Al layered double hydroxide (LDH) with chloride as the interlayer anion was identified as a crystalline secondary-phase component. In the present study, the incorporation of Cd into the structure of the Mg-Al-Cl LDH was investigated. Synthesis by a coprecipitation method was performed and the Mg-Cd-Al-Cl LDH obtained was characterized. The sorption behavior of selenium on the LDH was investigated in water, clay pore-water (Mont-Terri-type), and brine 2. Using a LDH concentration of 10 g/L, the sorption kinetics were rapid and equilibrium was reached within 12 h. The sorption of selenium decreased with increasing amount of chloride anions in the solutions. The chloride anions acted as competing anions for the sorption of selenium. The effect of pH on selenium sorption was investigated and a large buffer capacity of the LDH was observed. For the range of selenium concentration used, linear sorption isotherms were obtained which obeyed the Freundlich and Dubinin-Radushkevich models. From these, the energies of selenium sorption were calculated to be in the range of ion-exchange processes.

Từ khóa


Tài liệu tham khảo

10.1039/a606866i

10.1016/S0016-7037(02)00953-5

Riedel, 1990, Anorganische Chemie (Inorganic Chemistry)

10.1016/0920-5861(91)80068-K

10.1016/0927-7757(96)03542-X

10.1006/jcis.2002.8319

10.1007/BF02039709

10.1246/cl.1973.843

10.1021/ie049060u

10.1346/CCMN.1975.0230508

10.1016/S0021-9797(03)00400-4

10.1007/BF02035639

10.1346/CCMN.1983.0310409

Weiss, A. and Toth, E. (1996) Untersuchungen zur Synthese, Quellungseigenschaften und Anionenaustausch von kristallchemisch modifizierten Doppelhydroxiden vom Hydrotalkit-Typ (Investigations of synthesis, swelling properties and anion exchange of crystallochemical modified double hydroxides of the hydrotalcite type). Pp. 267–276 in: Contributions to the annual DTTG meeting Freiberg, Germany ( Wolf, D. , Starke, R. , and Kleeberg, R. , editors). Available at: . ISSN 1432–7007.

10.1016/S0169-1317(00)00043-0

10.1346/CCMN.2007.0550403

10.1016/j.watres.2006.12.033

Curtius, H. , Kaiser, G. , Paparigas, Z. , Ufer, K. , Müller, E. , Enge, R. , and Brücher, H. (2006) Untersuchungen zum Verhalten von Forschungsreaktor-Brennelementen (FR-BE) in den Wirtsgesteinsformationswässern möglicher Endläger (Investigations of the behavior of research reactor fuel elements in host rock waters of possible repositories). Berichte des Forschungszentrums Jülich, 4237, ISSN 0944-2952.

10.1016/0167-2738(86)90067-6

10.1524/ract.2008.1549

Thông tin
Thông tin xuất bản

Cambridge University Press (CUP)

Tập 57 Số 3

330-337

Thông tin tác giả