Perovskite synthesis via complex sol–gel process to immobilize radioactive waste elements

Smoliński, Tomasz; Deptula, A.; Olczak, Teresa; Łada, W.; Brykala, Marcin; Wojtowicz, Peter J.; Wawszczak, D.; Rogowski, Marcin; Zaza, F.

doi:10.1007/s10967-013-2835-x

Cited by 12 publications

(16 citation statements)

References 7 publications

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“…The main preparation steps consisted of chloride elimination [7] by distillation with nitric acid, addition of hydroxides of Ca, zirconyl nitrate, and Sr (10 mol%), partial evaporation of water and acid from the sols, grinding, and thermal treatment to crystalline final products, some of which were doped with Sr. We synthesized four types of samples: CaZrTi 2 O 7 (Z1), CaZrTi 2 O 7 + ASC (Z2), CaZrTi 2 O 7 + 10% Sr (Z3), and CaZrTi 2 O 7 +10% Sr + ASC (Z4). To prevent precipitation, we added ASC to samples Z2 and Z4 before the dechlorination step [7,8,11]. During dechlorination, we observed decomposition and vigorous evolution of gas owing to oxidation of the ASC by the nitrates.…”

Section: Methodsmentioning

confidence: 99%

Nuclear waste immobilization into structure of zirconolite by Complex Sol Gel Process

et al. 2014

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Zirconolite (CaZrTi 2 O 7 ) is one of the components of Synroc materials, which are regarded throughout the world nuclear as the second generation of high-level nuclear waste forms. The zirconolite phase was synthesized by a sol-gel method, with one variant of the method making use of ascorbic acid as a strong complexing agent. Into the structure of the zirconolite was incorporated 10 mol% Sr. Undoped and doped samples were examined by thermal analyses and X-ray diffraction. Addition of ascorbic acid to the sols lowered the firing temperature and promoted formation of the zirconolite phase.

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Section: Methodsmentioning

confidence: 99%

Nuclear waste immobilization into structure of zirconolite by Complex Sol Gel Process

et al. 2014

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“…The transition from the existing brown economy towards the desired green economy is based on the development of old technologies for improving efficient production processes and new technologies for using non-conventional energy and material sources, such as renewable/nuclear energies and recycled/reused materials. However, by referring to the new energy technologies such as nuclear plants and fuel cell systems, challenges related to the radioactive waste management [1] and component material reliability for electrochemical conversions [2,3] affect both their effective sustainability and feasibility. For these reasons, research efforts are focused on improving old energy technologies for promoting the efficient utilization of conventional fossil fuels by combustion processes.…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of methane by perovskite-type oxide nanoparticles as pollution prevention strategy

Zaza¹,

Luisetto²,

Serra³

et al. 2016

AIP Conference Proceedings

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Catalysis science offers to combustion technology significant opportunity to increase the fuel efficiency by lowering the internal temperature gradients and reduce the environmental impact by lowering local peak temperature and, consequently, thermodynamically inhibiting the nitrogen oxides formation. Alternative catalytic materials are transition metals oxide, including complex oxides with perovskite crystalline structure. The aim of this work is to synthetize lanthanum ferrite perovskites with lanthanum ions partially substituted by strontium ions in order to study the substitution effects on structural properties and redox activity of the original oxide. Lanthanum ferrite oxides partially substituted with different Strontium amount were synthesized by solution combustion method. The perovskite nanopowders obtained were characterized by XRD, SEM, TPR analyses for defining crystalline structure, morphology and redox properties. Finally, the catalytic activity for methane combustion was tested. The most performing catalysts was La0:6Sr0:4FeO3 having the highest oxygen vacancy concentration as revealed byTPR analysis

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“…For addressing that issue, engineering research has been focusing on nuclear and fuel cell technologies [1][2][3][4][5][6]. However, since nuclear waste management [7,8] and fuel cell reliability [9][10][11][12][13][14] are unresolved challenges, these technologies appear to be unsustainable and unfeasible. Currently, the green economy strategy is developed for addressing all issues with proactive balanced approaches.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of LaFeO3 sensing nanomaterial

Zaza¹,

Pallozzi²,

Serra³

et al. 2015

AIP Conference Proceedings

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Since industrial revolution, human activities drive towards unsustainable global economy due to the overexploitation of natural resources and the unacceptable emissions of pollution and greenhouse gases. In order to address that issue, engineering research has been focusing on gas sensors development for monitoring gas emissions and controlling the combustion process sustainability. Semiconductors metal oxides sensors are attractive technology because they require simple design and fabrication, involving high accessibility, small size and low cost. Perovskite oxides are the most promising sensing materials because sensitivity, selectivity, stability and speed-response can be modulated and optimized by changing the chemical composition. One of the most convenient synthesis process of perovskite is the citrate-nitrate auto-combustion method, in which nitrate is the oxidizing agent and citrate is the fuel and the chelating argent in the same time. Since the sensibility of perovskite oxides depends on the defective crystallographic structure and the nanomorphology, the experimental was designed in order to study the dependence of powder properties on the synthesis conditions, such as the solution acidity and the relative amount of metals, nitrates and citric acid. Crystalline structure was studied in depth for defining the effects of synthesis conditions on size, morphology and crystallographic structure of nanopowders of LaFeO3

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Perovskite synthesis via complex sol–gel process to immobilize radioactive waste elements

Cited by 12 publications

References 7 publications

Nuclear waste immobilization into structure of zirconolite by Complex Sol Gel Process

Nuclear waste immobilization into structure of zirconolite by Complex Sol Gel Process

Catalytic combustion of methane by perovskite-type oxide nanoparticles as pollution prevention strategy

Combustion synthesis of LaFeO3 sensing nanomaterial

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