Effect of Cr(III) Adsorption on the Dissolution of Boehmite Nanoparticles in Caustic SolutionClick to copy article linkArticle link copied!
- Wenwen CuiWenwen CuiPhysical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesNational Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, ChinaUniversity of Chinese Academy of Sciences, Beijing, 100049, ChinaMore by Wenwen Cui
- Xin Zhang*Xin Zhang*Email: [email protected]Physical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Xin Zhang
- Carolyn I. PearceCarolyn I. PearceEnergy & Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Carolyn I. Pearce
- Mark H. EngelhardMark H. EngelhardEnvironmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Mark H. Engelhard
- Hailin ZhangHailin ZhangPhysical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesNational Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, ChinaUniversity of Chinese Academy of Sciences, Beijing, 100049, ChinaMore by Hailin Zhang
- Yining WangYining WangPhysical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Yining Wang
- Steve M. HealdSteve M. HealdAdvanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Steve M. Heald
- Shili ZhengShili ZhengNational Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, ChinaMore by Shili Zheng
- Yi ZhangYi ZhangNational Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, ChinaMore by Yi Zhang
- Sue B. ClarkSue B. ClarkEnergy & Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesDepartment of Chemistry, Washington State University, Pullman, Washington 99164, United StatesMore by Sue B. Clark
- Ping Li*Ping Li*Email: [email protected]National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, ChinaMore by Ping Li
- Zheming Wang*Zheming Wang*Email: [email protected]Physical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Zheming Wang
- Kevin M. Rosso*Kevin M. Rosso*Email: [email protected]Physical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Kevin M. Rosso
Abstract
The incorporation of relatively minor impurity metals onto metal (oxy)hydroxides can strongly impact solubility. In complex highly alkaline multicomponent radioactive tank wastes such as those at the Hanford Nuclear Reservation, tests indicate that the surface area-normalized dissolution rate of boehmite (γ-AlOOH) nanomaterials is at least an order of magnitude lower than that predicted for the pure phase. Here, we examine the dissolution kinetics of boehmite coated by adsorbed Cr(III), which adheres at saturation coverages as sparse chemisorbed monolayer clusters. Using 40 nm boehmite nanoplates as a model system, temperature-dependent dissolution rates of pure versus Cr(III)-adsorbed boehmite showed that the initial rate for the latter is consistently several times lower, with an apparent activation energy 16 kJ·mol–1 higher. Although the surface coverage is only around 50%, solution analysis coupled to multimethod solids characterization reveal a phyicochemical armoring effect by adsorbed Cr(III) that substantially reduces the number of dissolution-active sites on particle surfaces. Such findings could help improve kinetics models of boehmite and/or metal ion adsorbed boehmite nanomaterials, ultimately providing a stronger foundation for the development of more robust complex radioactive liquid waste processing strategies.
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