scholarly journals Ultra-fast precipitation of transient amorphous cerium oxalate in concentrated nitric acid media

CrystEngComm ◽  
2018 ◽  
Vol 20 (24) ◽  
pp. 3302-3307 ◽  
Author(s):  
Isaac Rodríguez-Ruiz ◽  
Sophie Charton ◽  
Dimitri Radajewski ◽  
Thomas Bizien ◽  
Sébastien Teychené
Keyword(s):  
Phase Separation ◽  
Nitric Acid ◽  
Crystalline Phase ◽  
Acid Media ◽  
Cerium Oxalate

Amorphous cerium oxalate precipitates as a primary transient precursor for the crystalline phase by means of a binodal phase separation.

Multiparametric study of Th1−xLnxO2−x/2 mixed oxides dissolution in nitric acid media

2012 ◽  
Vol 429 (1-3) ◽  
pp. 237-244 ◽  
Author(s):  
D. Horlait ◽  
F. Tocino ◽  
N. Clavier ◽  
N. Dacheux ◽  
S. Szenknect
Keyword(s):  
Nitric Acid ◽  
Mixed Oxides ◽  
Acid Media

Synthesis of Diamantane Derivatives in Nitric Acid Media

2021 ◽  
Vol 57 (2) ◽  
pp. 186-194
Author(s):  
Yu. N. Klimochkin ◽  
E. A. Ivleva ◽  
M. S. Zaborskaya
Keyword(s):  
Nitric Acid ◽  
Acid Media

Preparation of Macroprous C12A7 Mayenite Monoliths via a Sol-Gel Process with Nitrates as Precursors

2018 ◽  
Vol 768 ◽  
pp. 211-217 ◽  
Author(s):  
Rui Wang ◽  
Yu Kun Sun ◽  
Bao Jia Qi Jiang ◽  
Hui Yang ◽  
Xing Zhong Guo
Keyword(s):  
Heat Treatment ◽  
Phase Separation ◽  
Binary System ◽  
Propylene Oxide ◽  
Crystalline Phase ◽  
Sol Gel ◽  
Single Crystalline ◽  
Sol Gel Process

Macroporous Ca12Al14O33(C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.

Selected Alkyl(phenyl)-N,N-dialkylcarbamoylmethylphosphine Oxides as Extractants for Am(III) from Nitric Acid Media

1982 ◽  
Vol 17 (10) ◽  
pp. 1261-1279 ◽  
Author(s):  
E. P. Horwitz ◽  
D. G. Kalina ◽  
L. Kaplan ◽  
G. W. Mason ◽  
H. Diamond
Keyword(s):  
Nitric Acid ◽  
Acid Media

scholarly journals Adsorptivity of Novel Cyclic Monoamide Resin for Selective Separation of U(VI) in Nitric Acid Media

2013 ◽  
Vol 39 ◽  
pp. 96-101 ◽  
Author(s):  
Masanobu Nogami ◽  
Tetsuhiro Nishida ◽  
Naoya Miyata
Keyword(s):  
Nitric Acid ◽  
Selective Separation ◽  
Acid Media

Effects of temperature on the extraction of U(VI) and Pu(IV) by tris(2-methylbutyl) phosphate from nitric acid media

2018 ◽  
Vol 106 (4) ◽  
pp. 281-289 ◽  
Author(s):  
A. Suresh ◽  
S. Jayalakshmi ◽  
Subramee Sarkar ◽  
N. Sivaraman
Keyword(s):  
Nitric Acid ◽  
Temperature Effects ◽  
Nitric Acid Concentration ◽  
Second Law ◽  
Extractant Concentration ◽  
Acid Media ◽  
Extraction Behavior ◽  
Ratio Data ◽  
Effects Of Temperature ◽  
Equilibrium Aqueous Phase

AbstractExtraction behavior of tris(2-methylbutyl) phosphate (T2MBP), a higher homologue of tri-n-butyl phosphate (TBP), in the extraction of U(VI) and Pu(IV) from nitric acid media has been evaluated in the present study. Distribution ratios for the extraction of these metal ions by T2MBP were measured as a function of equilibrium aqueous phase nitric acid concentration, extractant concentration and temperature to understand the temperature effects on extraction. Enthalpies of extraction of T2MBP/n-dodecane-U(VI)-HNO3and T2MBP/n-dodecane-Pu(IV)-HNO3systems were calculated from the distribution ratio data using “second law” method. The data reveal that the extraction of U(VI) by T2MBP is exothermic in nature, whereas that of Pu(IV) is endothermic.

Cyclic voltammetry of Pu and Np in nitric acid media

1971 ◽  
Vol 33 (1) ◽  
pp. 212-215 ◽  
Author(s):  
Sergio Casadio ◽  
Franco Orlandini
Keyword(s):  
Cyclic Voltammetry ◽  
Nitric Acid ◽  
Acid Media

scholarly journals Crystalline phase regulation of anatase–rutile TiO2 for the enhancement of photocatalytic activity

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43592-43598
Author(s):  
Kuang Wang ◽  
Yan Zhuo ◽  
Jiayi Chen ◽  
Dawei Gao ◽  
Yu Ren ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Photocatalytic Activity ◽  
Nitric Acid ◽  
Crystalline Phase ◽  
Crystalline Phases ◽  
Rutile Tio2 ◽  
Potassium Titanate ◽  
Phase Regulation ◽  
Calcination Method

Biphasic TiO2 with adjustable crystalline phases was prepared by the hydrothermal-calcination method assisted by nitric acid (HNO3) and hydrogen peroxide (H2O2), using potassium titanate oxalate (K2TiO(C2O4)2) as the titanium source.

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